gitweb/gitweb.perl

   1 #!/usr/bin/perl
   2
   3 # gitweb - simple web interface to track changes in git repositories
   4 #
   5 # (C) 2005-2006, Kay Sievers <kay.sievers@vrfy.org>
   6 # (C) 2005, Christian Gierke
   7 #
   8 # This program is licensed under the GPLv2
   9
  10 use 5.008;
  11 use strict;
  12 use warnings;
  13 use CGI qw(:standard :escapeHTML -nosticky);
  14 use CGI::Util qw(unescape);
  15 use CGI::Carp qw(fatalsToBrowser set_message);
  16 use Encode;
  17 use Fcntl ':mode';
  18 use File::Find qw();
  19 use File::Basename qw(basename);
  20 use Time::HiRes qw(gettimeofday tv_interval);
  21 binmode STDOUT, ':utf8';
  22
  23 if (!defined($CGI::VERSION) || $CGI::VERSION < 4.08) {
  24         eval 'sub CGI::multi_param { CGI::param(@_) }'
  25 }
  26
  27 our $t0 = [ gettimeofday() ];
  28 our $number_of_git_cmds = 0;
  29
  30 BEGIN {
  31         CGI->compile() if $ENV{'MOD_PERL'};
  32 }
  33
  34 our $version = "++GIT_VERSION++";
  35
  36 our ($my_url, $my_uri, $base_url, $path_info, $home_link);
  37 sub evaluate_uri {
  38         our $cgi;
  39
  40         our $my_url = $cgi->url();
  41         our $my_uri = $cgi->url(-absolute => 1);
  42
  43         # Base URL for relative URLs in gitweb ($logo, $favicon, ...),
  44         # needed and used only for URLs with nonempty PATH_INFO
  45         our $base_url = $my_url;
  46
  47         # When the script is used as DirectoryIndex, the URL does not contain the name
  48         # of the script file itself, and $cgi->url() fails to strip PATH_INFO, so we
  49         # have to do it ourselves. We make $path_info global because it's also used
  50         # later on.
  51         #
  52         # Another issue with the script being the DirectoryIndex is that the resulting
  53         # $my_url data is not the full script URL: this is good, because we want
  54         # generated links to keep implying the script name if it wasn't explicitly
  55         # indicated in the URL we're handling, but it means that $my_url cannot be used
  56         # as base URL.
  57         # Therefore, if we needed to strip PATH_INFO, then we know that we have
  58         # to build the base URL ourselves:
  59         our $path_info = decode_utf8($ENV{"PATH_INFO"});
  60         if ($path_info) {
  61                 # $path_info has already been URL-decoded by the web server, but
  62                 # $my_url and $my_uri have not. URL-decode them so we can properly
  63                 # strip $path_info.
  64                 $my_url = unescape($my_url);
  65                 $my_uri = unescape($my_uri);
  66                 if ($my_url =~ s,\Q$path_info\E$,, &&
  67                     $my_uri =~ s,\Q$path_info\E$,, &&
  68                     defined $ENV{'SCRIPT_NAME'}) {
  69                         $base_url = $cgi->url(-base => 1) . $ENV{'SCRIPT_NAME'};
  70                 }
  71         }
  72
  73         # target of the home link on top of all pages
  74         our $home_link = $my_uri || "/";
  75 }
  76
  77 # core git executable to use
  78 # this can just be "git" if your webserver has a sensible PATH
  79 our $GIT = "++GIT_BINDIR++/git";
  80
  81 # absolute fs-path which will be prepended to the project path
  82 #our $projectroot = "/pub/scm";
  83 our $projectroot = "++GITWEB_PROJECTROOT++";
  84
  85 # fs traversing limit for getting project list
  86 # the number is relative to the projectroot
  87 our $project_maxdepth = "++GITWEB_PROJECT_MAXDEPTH++";
  88
  89 # string of the home link on top of all pages
  90 our $home_link_str = "++GITWEB_HOME_LINK_STR++";
  91
  92 # extra breadcrumbs preceding the home link
  93 our @extra_breadcrumbs = ();
  94
  95 # name of your site or organization to appear in page titles
  96 # replace this with something more descriptive for clearer bookmarks
  97 our $site_name = "++GITWEB_SITENAME++"
  98                  || ($ENV{'SERVER_NAME'} || "Untitled") . " Git";
  99
 100 # html snippet to include in the <head> section of each page
 101 our $site_html_head_string = "++GITWEB_SITE_HTML_HEAD_STRING++";
 102 # filename of html text to include at top of each page
 103 our $site_header = "++GITWEB_SITE_HEADER++";
 104 # html text to include at home page
 105 our $home_text = "++GITWEB_HOMETEXT++";
 106 # filename of html text to include at bottom of each page
 107 our $site_footer = "++GITWEB_SITE_FOOTER++";
 108
 109 # URI of stylesheets
 110 our @stylesheets = ("++GITWEB_CSS++");
 111 # URI of a single stylesheet, which can be overridden in GITWEB_CONFIG.
 112 our $stylesheet = undef;
 113 # URI of GIT logo (72x27 size)
 114 our $logo = "++GITWEB_LOGO++";
 115 # URI of GIT favicon, assumed to be image/png type
 116 our $favicon = "++GITWEB_FAVICON++";
 117 # URI of gitweb.js (JavaScript code for gitweb)
 118 our $javascript = "++GITWEB_JS++";
 119
 120 # URI and label (title) of GIT logo link
 121 #our $logo_url = "http://www.kernel.org/pub/software/scm/git/docs/";
 122 #our $logo_label = "git documentation";
 123 our $logo_url = "http://git-scm.com/";
 124 our $logo_label = "git homepage";
 125
 126 # source of projects list
 127 our $projects_list = "++GITWEB_LIST++";
 128
 129 # the width (in characters) of the projects list "Description" column
 130 our $projects_list_description_width = 25;
 131
 132 # group projects by category on the projects list
 133 # (enabled if this variable evaluates to true)
 134 our $projects_list_group_categories = 0;
 135
 136 # default category if none specified
 137 # (leave the empty string for no category)
 138 our $project_list_default_category = "";
 139
 140 # default order of projects list
 141 # valid values are none, project, descr, owner, and age
 142 our $default_projects_order = "project";
 143
 144 # show repository only if this file exists
 145 # (only effective if this variable evaluates to true)
 146 our $export_ok = "++GITWEB_EXPORT_OK++";
 147
 148 # don't generate age column on the projects list page
 149 our $omit_age_column = 0;
 150
 151 # don't generate information about owners of repositories
 152 our $omit_owner=0;
 153
 154 # show repository only if this subroutine returns true
 155 # when given the path to the project, for example:
 156 #    sub { return -e "$_[0]/git-daemon-export-ok"; }
 157 our $export_auth_hook = undef;
 158
 159 # only allow viewing of repositories also shown on the overview page
 160 our $strict_export = "++GITWEB_STRICT_EXPORT++";
 161
 162 # list of git base URLs used for URL to where fetch project from,
 163 # i.e. full URL is "$git_base_url/$project"
 164 our @git_base_url_list = grep { $_ ne '' } ("++GITWEB_BASE_URL++");
 165
 166 # default blob_plain mimetype and default charset for text/plain blob
 167 our $default_blob_plain_mimetype = 'text/plain';
 168 our $default_text_plain_charset  = undef;
 169
 170 # file to use for guessing MIME types before trying /etc/mime.types
 171 # (relative to the current git repository)
 172 our $mimetypes_file = undef;
 173
 174 # assume this charset if line contains non-UTF-8 characters;
 175 # it should be valid encoding (see Encoding::Supported(3pm) for list),
 176 # for which encoding all byte sequences are valid, for example
 177 # 'iso-8859-1' aka 'latin1' (it is decoded without checking, so it
 178 # could be even 'utf-8' for the old behavior)
 179 our $fallback_encoding = 'latin1';
 180
 181 # rename detection options for git-diff and git-diff-tree
 182 # - default is '-M', with the cost proportional to
 183 #   (number of removed files) * (number of new files).
 184 # - more costly is '-C' (which implies '-M'), with the cost proportional to
 185 #   (number of changed files + number of removed files) * (number of new files)
 186 # - even more costly is '-C', '--find-copies-harder' with cost
 187 #   (number of files in the original tree) * (number of new files)
 188 # - one might want to include '-B' option, e.g. '-B', '-M'
 189 our @diff_opts = ('-M'); # taken from git_commit
 190
 191 # Disables features that would allow repository owners to inject script into
 192 # the gitweb domain.
 193 our $prevent_xss = 0;
 194
 195 # Path to the highlight executable to use (must be the one from
 196 # http://www.andre-simon.de due to assumptions about parameters and output).
 197 # Useful if highlight is not installed on your webserver's PATH.
 198 # [Default: highlight]
 199 our $highlight_bin = "++HIGHLIGHT_BIN++";
 200
 201 # information about snapshot formats that gitweb is capable of serving
 202 our %known_snapshot_formats = (
 203         # name => {
 204         #       'display' => display name,
 205         #       'type' => mime type,
 206         #       'suffix' => filename suffix,
 207         #       'format' => --format for git-archive,
 208         #       'compressor' => [compressor command and arguments]
 209         #                       (array reference, optional)
 210         #       'disabled' => boolean (optional)}
 211         #
 212         'tgz' => {
 213                 'display' => 'tar.gz',
 214                 'type' => 'application/x-gzip',
 215                 'suffix' => '.tar.gz',
 216                 'format' => 'tar',
 217                 'compressor' => ['gzip', '-n']},
 218
 219         'tbz2' => {
 220                 'display' => 'tar.bz2',
 221                 'type' => 'application/x-bzip2',
 222                 'suffix' => '.tar.bz2',
 223                 'format' => 'tar',
 224                 'compressor' => ['bzip2']},
 225
 226         'txz' => {
 227                 'display' => 'tar.xz',
 228                 'type' => 'application/x-xz',
 229                 'suffix' => '.tar.xz',
 230                 'format' => 'tar',
 231                 'compressor' => ['xz'],
 232                 'disabled' => 1},
 233
 234         'zip' => {
 235                 'display' => 'zip',
 236                 'type' => 'application/x-zip',
 237                 'suffix' => '.zip',
 238                 'format' => 'zip'},
 239 );
 240
 241 # Aliases so we understand old gitweb.snapshot values in repository
 242 # configuration.
 243 our %known_snapshot_format_aliases = (
 244         'gzip'  => 'tgz',
 245         'bzip2' => 'tbz2',
 246         'xz'    => 'txz',
 247
 248         # backward compatibility: legacy gitweb config support
 249         'x-gzip' => undef, 'gz' => undef,
 250         'x-bzip2' => undef, 'bz2' => undef,
 251         'x-zip' => undef, '' => undef,
 252 );
 253
 254 # Pixel sizes for icons and avatars. If the default font sizes or lineheights
 255 # are changed, it may be appropriate to change these values too via
 256 # $GITWEB_CONFIG.
 257 our %avatar_size = (
 258         'default' => 16,
 259         'double'  => 32
 260 );
 261
 262 # Used to set the maximum load that we will still respond to gitweb queries.
 263 # If server load exceed this value then return "503 server busy" error.
 264 # If gitweb cannot determined server load, it is taken to be 0.
 265 # Leave it undefined (or set to 'undef') to turn off load checking.
 266 our $maxload = 300;
 267
 268 # configuration for 'highlight' (http://www.andre-simon.de/)
 269 # match by basename
 270 our %highlight_basename = (
 271         #'Program' => 'py',
 272         #'Library' => 'py',
 273         'SConstruct' => 'py', # SCons equivalent of Makefile
 274         'Makefile' => 'make',
 275 );
 276 # match by extension
 277 our %highlight_ext = (
 278         # main extensions, defining name of syntax;
 279         # see files in /usr/share/highlight/langDefs/ directory
 280         (map { $_ => $_ } qw(py rb java css js tex bib xml awk bat ini spec tcl sql)),
 281         # alternate extensions, see /etc/highlight/filetypes.conf
 282         (map { $_ => 'c'   } qw(c h)),
 283         (map { $_ => 'sh'  } qw(sh bash zsh ksh)),
 284         (map { $_ => 'cpp' } qw(cpp cxx c++ cc)),
 285         (map { $_ => 'php' } qw(php php3 php4 php5 phps)),
 286         (map { $_ => 'pl'  } qw(pl perl pm)), # perhaps also 'cgi'
 287         (map { $_ => 'make'} qw(make mak mk)),
 288         (map { $_ => 'xml' } qw(xml xhtml html htm)),
 289 );
 290
 291 # You define site-wide feature defaults here; override them with
 292 # $GITWEB_CONFIG as necessary.
 293 our %feature = (
 294         # feature => {
 295         #       'sub' => feature-sub (subroutine),
 296         #       'override' => allow-override (boolean),
 297         #       'default' => [ default options...] (array reference)}
 298         #
 299         # if feature is overridable (it means that allow-override has true value),
 300         # then feature-sub will be called with default options as parameters;
 301         # return value of feature-sub indicates if to enable specified feature
 302         #
 303         # if there is no 'sub' key (no feature-sub), then feature cannot be
 304         # overridden
 305         #
 306         # use gitweb_get_feature(<feature>) to retrieve the <feature> value
 307         # (an array) or gitweb_check_feature(<feature>) to check if <feature>
 308         # is enabled
 309
 310         # Enable the 'blame' blob view, showing the last commit that modified
 311         # each line in the file. This can be very CPU-intensive.
 312
 313         # To enable system wide have in $GITWEB_CONFIG
 314         # $feature{'blame'}{'default'} = [1];
 315         # To have project specific config enable override in $GITWEB_CONFIG
 316         # $feature{'blame'}{'override'} = 1;
 317         # and in project config gitweb.blame = 0|1;
 318         'blame' => {
 319                 'sub' => sub { feature_bool('blame', @_) },
 320                 'override' => 0,
 321                 'default' => [0]},
 322
 323         # Enable the 'snapshot' link, providing a compressed archive of any
 324         # tree. This can potentially generate high traffic if you have large
 325         # project.
 326
 327         # Value is a list of formats defined in %known_snapshot_formats that
 328         # you wish to offer.
 329         # To disable system wide have in $GITWEB_CONFIG
 330         # $feature{'snapshot'}{'default'} = [];
 331         # To have project specific config enable override in $GITWEB_CONFIG
 332         # $feature{'snapshot'}{'override'} = 1;
 333         # and in project config, a comma-separated list of formats or "none"
 334         # to disable.  Example: gitweb.snapshot = tbz2,zip;
 335         'snapshot' => {
 336                 'sub' => \&feature_snapshot,
 337                 'override' => 0,
 338                 'default' => ['tgz']},
 339
 340         # Enable text search, which will list the commits which match author,
 341         # committer or commit text to a given string.  Enabled by default.
 342         # Project specific override is not supported.
 343         #
 344         # Note that this controls all search features, which means that if
 345         # it is disabled, then 'grep' and 'pickaxe' search would also be
 346         # disabled.
 347         'search' => {
 348                 'override' => 0,
 349                 'default' => [1]},
 350
 351         # Enable grep search, which will list the files in currently selected
 352         # tree containing the given string. Enabled by default. This can be
 353         # potentially CPU-intensive, of course.
 354         # Note that you need to have 'search' feature enabled too.
 355
 356         # To enable system wide have in $GITWEB_CONFIG
 357         # $feature{'grep'}{'default'} = [1];
 358         # To have project specific config enable override in $GITWEB_CONFIG
 359         # $feature{'grep'}{'override'} = 1;
 360         # and in project config gitweb.grep = 0|1;
 361         'grep' => {
 362                 'sub' => sub { feature_bool('grep', @_) },
 363                 'override' => 0,
 364                 'default' => [1]},
 365
 366         # Enable the pickaxe search, which will list the commits that modified
 367         # a given string in a file. This can be practical and quite faster
 368         # alternative to 'blame', but still potentially CPU-intensive.
 369         # Note that you need to have 'search' feature enabled too.
 370
 371         # To enable system wide have in $GITWEB_CONFIG
 372         # $feature{'pickaxe'}{'default'} = [1];
 373         # To have project specific config enable override in $GITWEB_CONFIG
 374         # $feature{'pickaxe'}{'override'} = 1;
 375         # and in project config gitweb.pickaxe = 0|1;
 376         'pickaxe' => {
 377                 'sub' => sub { feature_bool('pickaxe', @_) },
 378                 'override' => 0,
 379                 'default' => [1]},
 380
 381         # Enable showing size of blobs in a 'tree' view, in a separate
 382         # column, similar to what 'ls -l' does.  This cost a bit of IO.
 383
 384         # To disable system wide have in $GITWEB_CONFIG
 385         # $feature{'show-sizes'}{'default'} = [0];
 386         # To have project specific config enable override in $GITWEB_CONFIG
 387         # $feature{'show-sizes'}{'override'} = 1;
 388         # and in project config gitweb.showsizes = 0|1;
 389         'show-sizes' => {
 390                 'sub' => sub { feature_bool('showsizes', @_) },
 391                 'override' => 0,
 392                 'default' => [1]},
 393
 394         # Make gitweb use an alternative format of the URLs which can be
 395         # more readable and natural-looking: project name is embedded
 396         # directly in the path and the query string contains other
 397         # auxiliary information. All gitweb installations recognize
 398         # URL in either format; this configures in which formats gitweb
 399         # generates links.
 400
 401         # To enable system wide have in $GITWEB_CONFIG
 402         # $feature{'pathinfo'}{'default'} = [1];
 403         # Project specific override is not supported.
 404
 405         # Note that you will need to change the default location of CSS,
 406         # favicon, logo and possibly other files to an absolute URL. Also,
 407         # if gitweb.cgi serves as your indexfile, you will need to force
 408         # $my_uri to contain the script name in your $GITWEB_CONFIG (and you
 409         # will also likely want to set $home_link if you're setting $my_uri).
 410         'pathinfo' => {
 411                 'override' => 0,
 412                 'default' => [0]},
 413
 414         # Make gitweb consider projects in project root subdirectories
 415         # to be forks of existing projects. Given project $projname.git,
 416         # projects matching $projname/*.git will not be shown in the main
 417         # projects list, instead a '+' mark will be added to $projname
 418         # there and a 'forks' view will be enabled for the project, listing
 419         # all the forks. If project list is taken from a file, forks have
 420         # to be listed after the main project.
 421
 422         # To enable system wide have in $GITWEB_CONFIG
 423         # $feature{'forks'}{'default'} = [1];
 424         # Project specific override is not supported.
 425         'forks' => {
 426                 'override' => 0,
 427                 'default' => [0]},
 428
 429         # Insert custom links to the action bar of all project pages.
 430         # This enables you mainly to link to third-party scripts integrating
 431         # into gitweb; e.g. git-browser for graphical history representation
 432         # or custom web-based repository administration interface.
 433
 434         # The 'default' value consists of a list of triplets in the form
 435         # (label, link, position) where position is the label after which
 436         # to insert the link and link is a format string where %n expands
 437         # to the project name, %f to the project path within the filesystem,
 438         # %h to the current hash (h gitweb parameter) and %b to the current
 439         # hash base (hb gitweb parameter); %% expands to %.
 440
 441         # To enable system wide have in $GITWEB_CONFIG e.g.
 442         # $feature{'actions'}{'default'} = [('graphiclog',
 443         #       '/git-browser/by-commit.html?r=%n', 'summary')];
 444         # Project specific override is not supported.
 445         'actions' => {
 446                 'override' => 0,
 447                 'default' => []},
 448
 449         # Allow gitweb scan project content tags of project repository,
 450         # and display the popular Web 2.0-ish "tag cloud" near the projects
 451         # list.  Note that this is something COMPLETELY different from the
 452         # normal Git tags.
 453
 454         # gitweb by itself can show existing tags, but it does not handle
 455         # tagging itself; you need to do it externally, outside gitweb.
 456         # The format is described in git_get_project_ctags() subroutine.
 457         # You may want to install the HTML::TagCloud Perl module to get
 458         # a pretty tag cloud instead of just a list of tags.
 459
 460         # To enable system wide have in $GITWEB_CONFIG
 461         # $feature{'ctags'}{'default'} = [1];
 462         # Project specific override is not supported.
 463
 464         # In the future whether ctags editing is enabled might depend
 465         # on the value, but using 1 should always mean no editing of ctags.
 466         'ctags' => {
 467                 'override' => 0,
 468                 'default' => [0]},
 469
 470         # The maximum number of patches in a patchset generated in patch
 471         # view. Set this to 0 or undef to disable patch view, or to a
 472         # negative number to remove any limit.
 473
 474         # To disable system wide have in $GITWEB_CONFIG
 475         # $feature{'patches'}{'default'} = [0];
 476         # To have project specific config enable override in $GITWEB_CONFIG
 477         # $feature{'patches'}{'override'} = 1;
 478         # and in project config gitweb.patches = 0|n;
 479         # where n is the maximum number of patches allowed in a patchset.
 480         'patches' => {
 481                 'sub' => \&feature_patches,
 482                 'override' => 0,
 483                 'default' => [16]},
 484
 485         # Avatar support. When this feature is enabled, views such as
 486         # shortlog or commit will display an avatar associated with
 487         # the email of the committer(s) and/or author(s).
 488
 489         # Currently available providers are gravatar and picon.
 490         # If an unknown provider is specified, the feature is disabled.
 491
 492         # Gravatar depends on Digest::MD5.
 493         # Picon currently relies on the indiana.edu database.
 494
 495         # To enable system wide have in $GITWEB_CONFIG
 496         # $feature{'avatar'}{'default'} = ['<provider>'];
 497         # where <provider> is either gravatar or picon.
 498         # To have project specific config enable override in $GITWEB_CONFIG
 499         # $feature{'avatar'}{'override'} = 1;
 500         # and in project config gitweb.avatar = <provider>;
 501         'avatar' => {
 502                 'sub' => \&feature_avatar,
 503                 'override' => 0,
 504                 'default' => ['']},
 505
 506         # Enable displaying how much time and how many git commands
 507         # it took to generate and display page.  Disabled by default.
 508         # Project specific override is not supported.
 509         'timed' => {
 510                 'override' => 0,
 511                 'default' => [0]},
 512
 513         # Enable turning some links into links to actions which require
 514         # JavaScript to run (like 'blame_incremental').  Not enabled by
 515         # default.  Project specific override is currently not supported.
 516         'javascript-actions' => {
 517                 'override' => 0,
 518                 'default' => [0]},
 519
 520         # Enable and configure ability to change common timezone for dates
 521         # in gitweb output via JavaScript.  Enabled by default.
 522         # Project specific override is not supported.
 523         'javascript-timezone' => {
 524                 'override' => 0,
 525                 'default' => [
 526                         'local',     # default timezone: 'utc', 'local', or '(-|+)HHMM' format,
 527                                      # or undef to turn off this feature
 528                         'gitweb_tz', # name of cookie where to store selected timezone
 529                         'datetime',  # CSS class used to mark up dates for manipulation
 530                 ]},
 531
 532         # Syntax highlighting support. This is based on Daniel Svensson's
 533         # and Sham Chukoury's work in gitweb-xmms2.git.
 534         # It requires the 'highlight' program present in $PATH,
 535         # and therefore is disabled by default.
 536
 537         # To enable system wide have in $GITWEB_CONFIG
 538         # $feature{'highlight'}{'default'} = [1];
 539
 540         'highlight' => {
 541                 'sub' => sub { feature_bool('highlight', @_) },
 542                 'override' => 0,
 543                 'default' => [0]},
 544
 545         # Enable displaying of remote heads in the heads list
 546
 547         # To enable system wide have in $GITWEB_CONFIG
 548         # $feature{'remote_heads'}{'default'} = [1];
 549         # To have project specific config enable override in $GITWEB_CONFIG
 550         # $feature{'remote_heads'}{'override'} = 1;
 551         # and in project config gitweb.remoteheads = 0|1;
 552         'remote_heads' => {
 553                 'sub' => sub { feature_bool('remote_heads', @_) },
 554                 'override' => 0,
 555                 'default' => [0]},
 556
 557         # Enable showing branches under other refs in addition to heads
 558
 559         # To set system wide extra branch refs have in $GITWEB_CONFIG
 560         # $feature{'extra-branch-refs'}{'default'} = ['dirs', 'of', 'choice'];
 561         # To have project specific config enable override in $GITWEB_CONFIG
 562         # $feature{'extra-branch-refs'}{'override'} = 1;
 563         # and in project config gitweb.extrabranchrefs = dirs of choice
 564         # Every directory is separated with whitespace.
 565
 566         'extra-branch-refs' => {
 567                 'sub' => \&feature_extra_branch_refs,
 568                 'override' => 0,
 569                 'default' => []},
 570 );
 571
 572 sub gitweb_get_feature {
 573         my ($name) = @_;
 574         return unless exists $feature{$name};
 575         my ($sub, $override, @defaults) = (
 576                 $feature{$name}{'sub'},
 577                 $feature{$name}{'override'},
 578                 @{$feature{$name}{'default'}});
 579         # project specific override is possible only if we have project
 580         our $git_dir; # global variable, declared later
 581         if (!$override || !defined $git_dir) {
 582                 return @defaults;
 583         }
 584         if (!defined $sub) {
 585                 warn "feature $name is not overridable";
 586                 return @defaults;
 587         }
 588         return $sub->(@defaults);
 589 }
 590
 591 # A wrapper to check if a given feature is enabled.
 592 # With this, you can say
 593 #
 594 #   my $bool_feat = gitweb_check_feature('bool_feat');
 595 #   gitweb_check_feature('bool_feat') or somecode;
 596 #
 597 # instead of
 598 #
 599 #   my ($bool_feat) = gitweb_get_feature('bool_feat');
 600 #   (gitweb_get_feature('bool_feat'))[0] or somecode;
 601 #
 602 sub gitweb_check_feature {
 603         return (gitweb_get_feature(@_))[0];
 604 }
 605
 606
 607 sub feature_bool {
 608         my $key = shift;
 609         my ($val) = git_get_project_config($key, '--bool');
 610
 611         if (!defined $val) {
 612                 return ($_[0]);
 613         } elsif ($val eq 'true') {
 614                 return (1);
 615         } elsif ($val eq 'false') {
 616                 return (0);
 617         }
 618 }
 619
 620 sub feature_snapshot {
 621         my (@fmts) = @_;
 622
 623         my ($val) = git_get_project_config('snapshot');
 624
 625         if ($val) {
 626                 @fmts = ($val eq 'none' ? () : split /\s*[,\s]\s*/, $val);
 627         }
 628
 629         return @fmts;
 630 }
 631
 632 sub feature_patches {
 633         my @val = (git_get_project_config('patches', '--int'));
 634
 635         if (@val) {
 636                 return @val;
 637         }
 638
 639         return ($_[0]);
 640 }
 641
 642 sub feature_avatar {
 643         my @val = (git_get_project_config('avatar'));
 644
 645         return @val ? @val : @_;
 646 }
 647
 648 sub feature_extra_branch_refs {
 649         my (@branch_refs) = @_;
 650         my $values = git_get_project_config('extrabranchrefs');
 651
 652         if ($values) {
 653                 $values = config_to_multi ($values);
 654                 @branch_refs = ();
 655                 foreach my $value (@{$values}) {
 656                         push @branch_refs, split /\s+/, $value;
 657                 }
 658         }
 659
 660         return @branch_refs;
 661 }
 662
 663 # checking HEAD file with -e is fragile if the repository was
 664 # initialized long time ago (i.e. symlink HEAD) and was pack-ref'ed
 665 # and then pruned.
 666 sub check_head_link {
 667         my ($dir) = @_;
 668         my $headfile = "$dir/HEAD";
 669         return ((-e $headfile) ||
 670                 (-l $headfile && readlink($headfile) =~ /^refs\/heads\//));
 671 }
 672
 673 sub check_export_ok {
 674         my ($dir) = @_;
 675         return (check_head_link($dir) &&
 676                 (!$export_ok || -e "$dir/$export_ok") &&
 677                 (!$export_auth_hook || $export_auth_hook->($dir)));
 678 }
 679
 680 # process alternate names for backward compatibility
 681 # filter out unsupported (unknown) snapshot formats
 682 sub filter_snapshot_fmts {
 683         my @fmts = @_;
 684
 685         @fmts = map {
 686                 exists $known_snapshot_format_aliases{$_} ?
 687                        $known_snapshot_format_aliases{$_} : $_} @fmts;
 688         @fmts = grep {
 689                 exists $known_snapshot_formats{$_} &&
 690                 !$known_snapshot_formats{$_}{'disabled'}} @fmts;
 691 }
 692
 693 sub filter_and_validate_refs {
 694         my @refs = @_;
 695         my %unique_refs = ();
 696
 697         foreach my $ref (@refs) {
 698                 die_error(500, "Invalid ref '$ref' in 'extra-branch-refs' feature") unless (is_valid_ref_format($ref));
 699                 # 'heads' are added implicitly in get_branch_refs().
 700                 $unique_refs{$ref} = 1 if ($ref ne 'heads');
 701         }
 702         return sort keys %unique_refs;
 703 }
 704
 705 # If it is set to code reference, it is code that it is to be run once per
 706 # request, allowing updating configurations that change with each request,
 707 # while running other code in config file only once.
 708 #
 709 # Otherwise, if it is false then gitweb would process config file only once;
 710 # if it is true then gitweb config would be run for each request.
 711 our $per_request_config = 1;
 712
 713 # If true and fileno STDIN is 0 and getsockname succeeds and getpeername fails
 714 # with ENOTCONN, then FCGI mode will be activated automatically in just the
 715 # same way as though the --fcgi option had been given instead.
 716 our $auto_fcgi = 0;
 717
 718 # read and parse gitweb config file given by its parameter.
 719 # returns true on success, false on recoverable error, allowing
 720 # to chain this subroutine, using first file that exists.
 721 # dies on errors during parsing config file, as it is unrecoverable.
 722 sub read_config_file {
 723         my $filename = shift;
 724         return unless defined $filename;
 725         # die if there are errors parsing config file
 726         if (-e $filename) {
 727                 do $filename;
 728                 die $@ if $@;
 729                 return 1;
 730         }
 731         return;
 732 }
 733
 734 our ($GITWEB_CONFIG, $GITWEB_CONFIG_SYSTEM, $GITWEB_CONFIG_COMMON);
 735 sub evaluate_gitweb_config {
 736         our $GITWEB_CONFIG = $ENV{'GITWEB_CONFIG'} || "++GITWEB_CONFIG++";
 737         our $GITWEB_CONFIG_SYSTEM = $ENV{'GITWEB_CONFIG_SYSTEM'} || "++GITWEB_CONFIG_SYSTEM++";
 738         our $GITWEB_CONFIG_COMMON = $ENV{'GITWEB_CONFIG_COMMON'} || "++GITWEB_CONFIG_COMMON++";
 739
 740         # Protect against duplications of file names, to not read config twice.
 741         # Only one of $GITWEB_CONFIG and $GITWEB_CONFIG_SYSTEM is used, so
 742         # there possibility of duplication of filename there doesn't matter.
 743         $GITWEB_CONFIG = ""        if ($GITWEB_CONFIG eq $GITWEB_CONFIG_COMMON);
 744         $GITWEB_CONFIG_SYSTEM = "" if ($GITWEB_CONFIG_SYSTEM eq $GITWEB_CONFIG_COMMON);
 745
 746         # Common system-wide settings for convenience.
 747         # Those settings can be ovverriden by GITWEB_CONFIG or GITWEB_CONFIG_SYSTEM.
 748         read_config_file($GITWEB_CONFIG_COMMON);
 749
 750         # Use first config file that exists.  This means use the per-instance
 751         # GITWEB_CONFIG if exists, otherwise use GITWEB_SYSTEM_CONFIG.
 752         read_config_file($GITWEB_CONFIG) and return;
 753         read_config_file($GITWEB_CONFIG_SYSTEM);
 754 }
 755
 756 our $encode_object;
 757 our $to_utf8_pipe_command = '';
 758
 759 sub evaluate_encoding {
 760         my $requested = $fallback_encoding || 'ISO-8859-1';
 761         my $obj = Encode::find_encoding($requested) or
 762                 die_error(400, "Requested fallback encoding not found");
 763         if ($obj->name eq 'iso-8859-1') {
 764                 # Use Windows-1252 instead as required by the HTML 5 standard
 765                 my $altobj = Encode::find_encoding('Windows-1252');
 766                 $obj = $altobj if $altobj;
 767         }
 768         $encode_object = $obj;
 769         my $nm = lc($encode_object->name);
 770         unless ($nm eq 'cp1252' || $nm eq 'ascii' || $nm eq 'utf8' ||
 771                 $nm =~ /^utf-8/ || $nm =~ /^iso-8859-/) {
 772                 $to_utf8_pipe_command =
 773                   quote_command($^X, '-CO', '-MEncode=decode,FB_DEFAULT', '-pse',
 774                     '$_ = decode($fe, $_, FB_DEFAULT) if !utf8::decode($_);',
 775                     '--', "-fe=$fallback_encoding")." | ";
 776         }
 777 }
 778
 779 sub evaluate_email_obfuscate {
 780         # email obfuscation
 781         our $email;
 782         if (!$email && eval { require HTML::Email::Obfuscate; 1 }) {
 783                 $email = HTML::Email::Obfuscate->new(lite => 1);
 784         }
 785 }
 786
 787 # Get loadavg of system, to compare against $maxload.
 788 # Currently it requires '/proc/loadavg' present to get loadavg;
 789 # if it is not present it returns 0, which means no load checking.
 790 sub get_loadavg {
 791         if( -e '/proc/loadavg' ){
 792                 open my $fd, '<', '/proc/loadavg'
 793                         or return 0;
 794                 my @load = split(/\s+/, scalar <$fd>);
 795                 close $fd;
 796
 797                 # The first three columns measure CPU and IO utilization of the last one,
 798                 # five, and 10 minute periods.  The fourth column shows the number of
 799                 # currently running processes and the total number of processes in the m/n
 800                 # format.  The last column displays the last process ID used.
 801                 return $load[0] || 0;
 802         }
 803         # additional checks for load average should go here for things that don't export
 804         # /proc/loadavg
 805
 806         return 0;
 807 }
 808
 809 # version of the core git binary
 810 our $git_version;
 811 sub evaluate_git_version {
 812         our $git_version = qx("$GIT" --version) =~ m/git version (.*)$/ ? $1 : "unknown";
 813         $number_of_git_cmds++;
 814 }
 815
 816 sub check_loadavg {
 817         if (defined $maxload && get_loadavg() > $maxload) {
 818                 die_error(503, "The load average on the server is too high");
 819         }
 820 }
 821
 822 # ======================================================================
 823 # input validation and dispatch
 824
 825 # input parameters can be collected from a variety of sources (presently, CGI
 826 # and PATH_INFO), so we define an %input_params hash that collects them all
 827 # together during validation: this allows subsequent uses (e.g. href()) to be
 828 # agnostic of the parameter origin
 829
 830 our %input_params = ();
 831
 832 # input parameters are stored with the long parameter name as key. This will
 833 # also be used in the href subroutine to convert parameters to their CGI
 834 # equivalent, and since the href() usage is the most frequent one, we store
 835 # the name -> CGI key mapping here, instead of the reverse.
 836 #
 837 # XXX: Warning: If you touch this, check the search form for updating,
 838 # too.
 839
 840 our @cgi_param_mapping = (
 841         project => "p",
 842         action => "a",
 843         file_name => "f",
 844         file_parent => "fp",
 845         hash => "h",
 846         hash_parent => "hp",
 847         hash_base => "hb",
 848         hash_parent_base => "hpb",
 849         page => "pg",
 850         order => "o",
 851         searchtext => "s",
 852         searchtype => "st",
 853         snapshot_format => "sf",
 854         extra_options => "opt",
 855         search_use_regexp => "sr",
 856         ctag => "by_tag",
 857         diff_style => "ds",
 858         project_filter => "pf",
 859         # this must be last entry (for manipulation from JavaScript)
 860         javascript => "js"
 861 );
 862 our %cgi_param_mapping = @cgi_param_mapping;
 863
 864 # we will also need to know the possible actions, for validation
 865 our %actions = (
 866         "blame" => \&git_blame,
 867         "blame_incremental" => \&git_blame_incremental,
 868         "blame_data" => \&git_blame_data,
 869         "blobdiff" => \&git_blobdiff,
 870         "blobdiff_plain" => \&git_blobdiff_plain,
 871         "blob" => \&git_blob,
 872         "blob_plain" => \&git_blob_plain,
 873         "commitdiff" => \&git_commitdiff,
 874         "commitdiff_plain" => \&git_commitdiff_plain,
 875         "commit" => \&git_commit,
 876         "forks" => \&git_forks,
 877         "heads" => \&git_heads,
 878         "history" => \&git_history,
 879         "log" => \&git_log,
 880         "patch" => \&git_patch,
 881         "patches" => \&git_patches,
 882         "remotes" => \&git_remotes,
 883         "rss" => \&git_rss,
 884         "atom" => \&git_atom,
 885         "search" => \&git_search,
 886         "search_help" => \&git_search_help,
 887         "shortlog" => \&git_shortlog,
 888         "summary" => \&git_summary,
 889         "tag" => \&git_tag,
 890         "tags" => \&git_tags,
 891         "tree" => \&git_tree,
 892         "snapshot" => \&git_snapshot,
 893         "object" => \&git_object,
 894         # those below don't need $project
 895         "opml" => \&git_opml,
 896         "project_list" => \&git_project_list,
 897         "project_index" => \&git_project_index,
 898 );
 899
 900 # finally, we have the hash of allowed extra_options for the commands that
 901 # allow them
 902 our %allowed_options = (
 903         "--no-merges" => [ qw(rss atom log shortlog history) ],
 904 );
 905
 906 # fill %input_params with the CGI parameters. All values except for 'opt'
 907 # should be single values, but opt can be an array. We should probably
 908 # build an array of parameters that can be multi-valued, but since for the time
 909 # being it's only this one, we just single it out
 910 sub evaluate_query_params {
 911         our $cgi;
 912
 913         while (my ($name, $symbol) = each %cgi_param_mapping) {
 914                 if ($symbol eq 'opt') {
 915                         $input_params{$name} = [ map { decode_utf8($_) } $cgi->multi_param($symbol) ];
 916                 } else {
 917                         $input_params{$name} = decode_utf8($cgi->param($symbol));
 918                 }
 919         }
 920 }
 921
 922 # now read PATH_INFO and update the parameter list for missing parameters
 923 sub evaluate_path_info {
 924         return if defined $input_params{'project'};
 925         return if !$path_info;
 926         $path_info =~ s,^/+,,;
 927         return if !$path_info;
 928
 929         # find which part of PATH_INFO is project
 930         my $project = $path_info;
 931         $project =~ s,/+$,,;
 932         while ($project && !check_head_link("$projectroot/$project")) {
 933                 $project =~ s,/*[^/]*$,,;
 934         }
 935         return unless $project;
 936         $input_params{'project'} = $project;
 937
 938         # do not change any parameters if an action is given using the query string
 939         return if $input_params{'action'};
 940         $path_info =~ s,^\Q$project\E/*,,;
 941
 942         # next, check if we have an action
 943         my $action = $path_info;
 944         $action =~ s,/.*$,,;
 945         if (exists $actions{$action}) {
 946                 $path_info =~ s,^$action/*,,;
 947                 $input_params{'action'} = $action;
 948         }
 949
 950         # list of actions that want hash_base instead of hash, but can have no
 951         # pathname (f) parameter
 952         my @wants_base = (
 953                 'tree',
 954                 'history',
 955         );
 956
 957         # we want to catch, among others
 958         # [$hash_parent_base[:$file_parent]..]$hash_parent[:$file_name]
 959         my ($parentrefname, $parentpathname, $refname, $pathname) =
 960                 ($path_info =~ /^(?:(.+?)(?::(.+))?\.\.)?([^:]+?)?(?::(.+))?$/);
 961
 962         # first, analyze the 'current' part
 963         if (defined $pathname) {
 964                 # we got "branch:filename" or "branch:dir/"
 965                 # we could use git_get_type(branch:pathname), but:
 966                 # - it needs $git_dir
 967                 # - it does a git() call
 968                 # - the convention of terminating directories with a slash
 969                 #   makes it superfluous
 970                 # - embedding the action in the PATH_INFO would make it even
 971                 #   more superfluous
 972                 $pathname =~ s,^/+,,;
 973                 if (!$pathname || substr($pathname, -1) eq "/") {
 974                         $input_params{'action'} ||= "tree";
 975                         $pathname =~ s,/$,,;
 976                 } else {
 977                         # the default action depends on whether we had parent info
 978                         # or not
 979                         if ($parentrefname) {
 980                                 $input_params{'action'} ||= "blobdiff_plain";
 981                         } else {
 982                                 $input_params{'action'} ||= "blob_plain";
 983                         }
 984                 }
 985                 $input_params{'hash_base'} ||= $refname;
 986                 $input_params{'file_name'} ||= $pathname;
 987         } elsif (defined $refname) {
 988                 # we got "branch". In this case we have to choose if we have to
 989                 # set hash or hash_base.
 990                 #
 991                 # Most of the actions without a pathname only want hash to be
 992                 # set, except for the ones specified in @wants_base that want
 993                 # hash_base instead. It should also be noted that hand-crafted
 994                 # links having 'history' as an action and no pathname or hash
 995                 # set will fail, but that happens regardless of PATH_INFO.
 996                 if (defined $parentrefname) {
 997                         # if there is parent let the default be 'shortlog' action
 998                         # (for http://git.example.com/repo.git/A..B links); if there
 999                         # is no parent, dispatch will detect type of object and set
1000                         # action appropriately if required (if action is not set)
1001                         $input_params{'action'} ||= "shortlog";
1002                 }
1003                 if ($input_params{'action'} &&
1004                     grep { $_ eq $input_params{'action'} } @wants_base) {
1005                         $input_params{'hash_base'} ||= $refname;
1006                 } else {
1007                         $input_params{'hash'} ||= $refname;
1008                 }
1009         }
1010
1011         # next, handle the 'parent' part, if present
1012         if (defined $parentrefname) {
1013                 # a missing pathspec defaults to the 'current' filename, allowing e.g.
1014                 # someproject/blobdiff/oldrev..newrev:/filename
1015                 if ($parentpathname) {
1016                         $parentpathname =~ s,^/+,,;
1017                         $parentpathname =~ s,/$,,;
1018                         $input_params{'file_parent'} ||= $parentpathname;
1019                 } else {
1020                         $input_params{'file_parent'} ||= $input_params{'file_name'};
1021                 }
1022                 # we assume that hash_parent_base is wanted if a path was specified,
1023                 # or if the action wants hash_base instead of hash
1024                 if (defined $input_params{'file_parent'} ||
1025                         grep { $_ eq $input_params{'action'} } @wants_base) {
1026                         $input_params{'hash_parent_base'} ||= $parentrefname;
1027                 } else {
1028                         $input_params{'hash_parent'} ||= $parentrefname;
1029                 }
1030         }
1031
1032         # for the snapshot action, we allow URLs in the form
1033         # $project/snapshot/$hash.ext
1034         # where .ext determines the snapshot and gets removed from the
1035         # passed $refname to provide the $hash.
1036         #
1037         # To be able to tell that $refname includes the format extension, we
1038         # require the following two conditions to be satisfied:
1039         # - the hash input parameter MUST have been set from the $refname part
1040         #   of the URL (i.e. they must be equal)
1041         # - the snapshot format MUST NOT have been defined already (e.g. from
1042         #   CGI parameter sf)
1043         # It's also useless to try any matching unless $refname has a dot,
1044         # so we check for that too
1045         if (defined $input_params{'action'} &&
1046                 $input_params{'action'} eq 'snapshot' &&
1047                 defined $refname && index($refname, '.') != -1 &&
1048                 $refname eq $input_params{'hash'} &&
1049                 !defined $input_params{'snapshot_format'}) {
1050                 # We loop over the known snapshot formats, checking for
1051                 # extensions. Allowed extensions are both the defined suffix
1052                 # (which includes the initial dot already) and the snapshot
1053                 # format key itself, with a prepended dot
1054                 while (my ($fmt, $opt) = each %known_snapshot_formats) {
1055                         my $hash = $refname;
1056                         unless ($hash =~ s/(\Q$opt->{'suffix'}\E|\Q.$fmt\E)$//) {
1057                                 next;
1058                         }
1059                         my $sfx = $1;
1060                         # a valid suffix was found, so set the snapshot format
1061                         # and reset the hash parameter
1062                         $input_params{'snapshot_format'} = $fmt;
1063                         $input_params{'hash'} = $hash;
1064                         # we also set the format suffix to the one requested
1065                         # in the URL: this way a request for e.g. .tgz returns
1066                         # a .tgz instead of a .tar.gz
1067                         $known_snapshot_formats{$fmt}{'suffix'} = $sfx;
1068                         last;
1069                 }
1070         }
1071 }
1072
1073 our ($action, $project, $file_name, $file_parent, $hash, $hash_parent, $hash_base,
1074      $hash_parent_base, @extra_options, $page, $searchtype, $search_use_regexp,
1075      $searchtext, $search_regexp, $project_filter);
1076 sub evaluate_and_validate_params {
1077         our $action = $input_params{'action'};
1078         if (defined $action) {
1079                 if (!is_valid_action($action)) {
1080                         die_error(400, "Invalid action parameter");
1081                 }
1082         }
1083
1084         # parameters which are pathnames
1085         our $project = $input_params{'project'};
1086         if (defined $project) {
1087                 if (!is_valid_project($project)) {
1088                         undef $project;
1089                         die_error(404, "No such project");
1090                 }
1091         }
1092
1093         our $project_filter = $input_params{'project_filter'};
1094         if (defined $project_filter) {
1095                 if (!is_valid_pathname($project_filter)) {
1096                         die_error(404, "Invalid project_filter parameter");
1097                 }
1098         }
1099
1100         our $file_name = $input_params{'file_name'};
1101         if (defined $file_name) {
1102                 if (!is_valid_pathname($file_name)) {
1103                         die_error(400, "Invalid file parameter");
1104                 }
1105         }
1106
1107         our $file_parent = $input_params{'file_parent'};
1108         if (defined $file_parent) {
1109                 if (!is_valid_pathname($file_parent)) {
1110                         die_error(400, "Invalid file parent parameter");
1111                 }
1112         }
1113
1114         # parameters which are refnames
1115         our $hash = $input_params{'hash'};
1116         if (defined $hash) {
1117                 if (!is_valid_refname($hash)) {
1118                         die_error(400, "Invalid hash parameter");
1119                 }
1120         }
1121
1122         our $hash_parent = $input_params{'hash_parent'};
1123         if (defined $hash_parent) {
1124                 if (!is_valid_refname($hash_parent)) {
1125                         die_error(400, "Invalid hash parent parameter");
1126                 }
1127         }
1128
1129         our $hash_base = $input_params{'hash_base'};
1130         if (defined $hash_base) {
1131                 if (!is_valid_refname($hash_base)) {
1132                         die_error(400, "Invalid hash base parameter");
1133                 }
1134         }
1135
1136         our @extra_options = @{$input_params{'extra_options'}};
1137         # @extra_options is always defined, since it can only be (currently) set from
1138         # CGI, and $cgi->param() returns the empty array in array context if the param
1139         # is not set
1140         foreach my $opt (@extra_options) {
1141                 if (not exists $allowed_options{$opt}) {
1142                         die_error(400, "Invalid option parameter");
1143                 }
1144                 if (not grep(/^$action$/, @{$allowed_options{$opt}})) {
1145                         die_error(400, "Invalid option parameter for this action");
1146                 }
1147         }
1148
1149         our $hash_parent_base = $input_params{'hash_parent_base'};
1150         if (defined $hash_parent_base) {
1151                 if (!is_valid_refname($hash_parent_base)) {
1152                         die_error(400, "Invalid hash parent base parameter");
1153                 }
1154         }
1155
1156         # other parameters
1157         our $page = $input_params{'page'};
1158         if (defined $page) {
1159                 if ($page =~ m/[^0-9]/) {
1160                         die_error(400, "Invalid page parameter");
1161                 }
1162         }
1163
1164         our $searchtype = $input_params{'searchtype'};
1165         if (defined $searchtype) {
1166                 if ($searchtype =~ m/[^a-z]/) {
1167                         die_error(400, "Invalid searchtype parameter");
1168                 }
1169         }
1170
1171         our $search_use_regexp = $input_params{'search_use_regexp'};
1172
1173         our $searchtext = $input_params{'searchtext'};
1174         our $search_regexp = undef;
1175         if (defined $searchtext) {
1176                 if (length($searchtext) < 2) {
1177                         die_error(403, "At least two characters are required for search parameter");
1178                 }
1179                 if ($search_use_regexp) {
1180                         $search_regexp = $searchtext;
1181                         if (!eval { qr/$search_regexp/; 1; }) {
1182                                 (my $error = $@) =~ s/ at \S+ line \d+.*\n?//;
1183                                 die_error(400, "Invalid search regexp '$search_regexp'",
1184                                           esc_html($error));
1185                         }
1186                 } else {
1187                         $search_regexp = quotemeta $searchtext;
1188                 }
1189         }
1190 }
1191
1192 # path to the current git repository
1193 our $git_dir;
1194 sub evaluate_git_dir {
1195         our $git_dir = "$projectroot/$project" if $project;
1196 }
1197
1198 our (@snapshot_fmts, $git_avatar, @extra_branch_refs);
1199 sub configure_gitweb_features {
1200         # list of supported snapshot formats
1201         our @snapshot_fmts = gitweb_get_feature('snapshot');
1202         @snapshot_fmts = filter_snapshot_fmts(@snapshot_fmts);
1203
1204         # check that the avatar feature is set to a known provider name,
1205         # and for each provider check if the dependencies are satisfied.
1206         # if the provider name is invalid or the dependencies are not met,
1207         # reset $git_avatar to the empty string.
1208         our ($git_avatar) = gitweb_get_feature('avatar');
1209         if ($git_avatar eq 'gravatar') {
1210                 $git_avatar = '' unless (eval { require Digest::MD5; 1; });
1211         } elsif ($git_avatar eq 'picon') {
1212                 # no dependencies
1213         } else {
1214                 $git_avatar = '';
1215         }
1216
1217         our @extra_branch_refs = gitweb_get_feature('extra-branch-refs');
1218         @extra_branch_refs = filter_and_validate_refs (@extra_branch_refs);
1219 }
1220
1221 sub get_branch_refs {
1222         return ('heads', @extra_branch_refs);
1223 }
1224
1225 # custom error handler: 'die <message>' is Internal Server Error
1226 sub handle_errors_html {
1227         my $msg = shift; # it is already HTML escaped
1228
1229         # to avoid infinite loop where error occurs in die_error,
1230         # change handler to default handler, disabling handle_errors_html
1231         set_message("Error occurred when inside die_error:\n$msg");
1232
1233         # you cannot jump out of die_error when called as error handler;
1234         # the subroutine set via CGI::Carp::set_message is called _after_
1235         # HTTP headers are already written, so it cannot write them itself
1236         die_error(undef, undef, $msg, -error_handler => 1, -no_http_header => 1);
1237 }
1238 set_message(\&handle_errors_html);
1239
1240 # dispatch
1241 sub dispatch {
1242         if (!defined $action) {
1243                 if (defined $hash) {
1244                         $action = git_get_type($hash);
1245                         $action or die_error(404, "Object does not exist");
1246                 } elsif (defined $hash_base && defined $file_name) {
1247                         $action = git_get_type("$hash_base:$file_name");
1248                         $action or die_error(404, "File or directory does not exist");
1249                 } elsif (defined $project) {
1250                         $action = 'summary';
1251                 } else {
1252                         $action = 'project_list';
1253                 }
1254         }
1255         if (!defined($actions{$action})) {
1256                 die_error(400, "Unknown action");
1257         }
1258         if ($action !~ m/^(?:opml|project_list|project_index)$/ &&
1259             !$project) {
1260                 die_error(400, "Project needed");
1261         }
1262         $actions{$action}->();
1263 }
1264
1265 sub reset_timer {
1266         our $t0 = [ gettimeofday() ]
1267                 if defined $t0;
1268         our $number_of_git_cmds = 0;
1269 }
1270
1271 our $first_request = 1;
1272 our $evaluate_uri_force = undef;
1273 sub run_request {
1274         reset_timer();
1275
1276         # Only allow GET and HEAD methods
1277         if (!$ENV{'REQUEST_METHOD'} || ($ENV{'REQUEST_METHOD'} ne 'GET' && $ENV{'REQUEST_METHOD'} ne 'HEAD')) {
1278                 print <<EOT;
1279 Status: 405 Method Not Allowed
1280 Content-Type: text/plain
1281 Allow: GET,HEAD
1282
1283 405 Method Not Allowed
1284 EOT
1285                 return;
1286         }
1287
1288         evaluate_uri();
1289         &$evaluate_uri_force() if $evaluate_uri_force;
1290         if ($per_request_config) {
1291                 if (ref($per_request_config) eq 'CODE') {
1292                         $per_request_config->();
1293                 } elsif (!$first_request) {
1294                         evaluate_gitweb_config();
1295                         evaluate_email_obfuscate();
1296                 }
1297         }
1298         check_loadavg();
1299
1300         # $projectroot and $projects_list might be set in gitweb config file
1301         $projects_list ||= $projectroot;
1302
1303         evaluate_query_params();
1304         evaluate_path_info();
1305         evaluate_and_validate_params();
1306         evaluate_git_dir();
1307
1308         configure_gitweb_features();
1309
1310         dispatch();
1311 }
1312
1313 our $is_last_request = sub { 1 };
1314 our ($pre_dispatch_hook, $post_dispatch_hook, $pre_listen_hook);
1315 our $CGI = 'CGI';
1316 our $cgi;
1317 our $fcgi_mode = 0;
1318 our $fcgi_nproc_active = 0;
1319 sub is_fcgi {
1320         use Errno;
1321         my $stdinfno = fileno STDIN;
1322         return 0 unless defined $stdinfno && $stdinfno == 0;
1323         return 0 unless getsockname STDIN;
1324         return 0 if getpeername STDIN;
1325         return $!{ENOTCONN}?1:0;
1326 }
1327 sub configure_as_fcgi {
1328         return if $fcgi_mode;
1329
1330         require CGI::Fast;
1331         our $CGI = 'CGI::Fast';
1332
1333         $fcgi_mode = 1;
1334         $first_request = 0;
1335         my $request_number = 0;
1336         # let each child service 100 requests
1337         our $is_last_request = sub { ++$request_number > 100 };
1338 }
1339 sub evaluate_argv {
1340         my $script_name = $ENV{'SCRIPT_NAME'} || $ENV{'SCRIPT_FILENAME'} || __FILE__;
1341         configure_as_fcgi()
1342                 if $script_name =~ /\.fcgi$/ || ($auto_fcgi && is_fcgi());
1343
1344         my $nproc_sub = sub {
1345                 my ($arg, $val) = @_;
1346                 return unless eval { require FCGI::ProcManager; 1; };
1347                 $fcgi_nproc_active = 1;
1348                 my $proc_manager = FCGI::ProcManager->new({
1349                         n_processes => $val,
1350                 });
1351                 our $pre_listen_hook    = sub { $proc_manager->pm_manage()        };
1352                 our $pre_dispatch_hook  = sub { $proc_manager->pm_pre_dispatch()  };
1353                 our $post_dispatch_hook = sub { $proc_manager->pm_post_dispatch() };
1354         };
1355         if (@ARGV) {
1356                 require Getopt::Long;
1357                 Getopt::Long::GetOptions(
1358                         'fastcgi|fcgi|f' => \&configure_as_fcgi,
1359                         'nproc|n=i' => $nproc_sub,
1360                 );
1361         };
1362         if (!$fcgi_nproc_active && defined $ENV{'GITWEB_FCGI_NPROC'} && $ENV{'GITWEB_FCGI_NPROC'} =~ /^\d+$/) {
1363                 &$nproc_sub('nproc', $ENV{'GITWEB_FCGI_NPROC'});
1364         }
1365 }
1366
1367 sub run {
1368         evaluate_gitweb_config();
1369         evaluate_encoding();
1370         evaluate_email_obfuscate();
1371         evaluate_git_version();
1372         my ($ml, $mi, $bu, $hl, $subroutine) = ($my_url, $my_uri, $base_url, $home_link, '');
1373         $subroutine .= '$my_url = $ml;' if defined $my_url && $my_url ne '';
1374         $subroutine .= '$my_uri = $mi;' if defined $my_uri; # this one can be ""
1375         $subroutine .= '$base_url = $bu;' if defined $base_url && $base_url ne '';
1376         $subroutine .= '$home_link = $hl;' if defined $home_link && $home_link ne '';
1377         $evaluate_uri_force = eval "sub {$subroutine}" if $subroutine;
1378         $first_request = 1;
1379         evaluate_argv();
1380
1381         $pre_listen_hook->()
1382                 if $pre_listen_hook;
1383
1384  REQUEST:
1385         while ($cgi = $CGI->new()) {
1386                 $pre_dispatch_hook->()
1387                         if $pre_dispatch_hook;
1388
1389                 run_request();
1390
1391                 $post_dispatch_hook->()
1392                         if $post_dispatch_hook;
1393                 $first_request = 0;
1394
1395                 last REQUEST if ($is_last_request->());
1396         }
1397
1398  DONE_GITWEB:
1399         1;
1400 }
1401
1402 run();
1403
1404 if (defined caller) {
1405         # wrapped in a subroutine processing requests,
1406         # e.g. mod_perl with ModPerl::Registry, or PSGI with Plack::App::WrapCGI
1407         return;
1408 } else {
1409         # pure CGI script, serving single request
1410         exit;
1411 }
1412
1413 ## ======================================================================
1414 ## action links
1415
1416 # possible values of extra options
1417 # -full => 0|1      - use absolute/full URL ($my_uri/$my_url as base)
1418 # -replay => 1      - start from a current view (replay with modifications)
1419 # -path_info => 0|1 - don't use/use path_info URL (if possible)
1420 # -anchor => ANCHOR - add #ANCHOR to end of URL, implies -replay if used alone
1421 sub href {
1422         my %params = @_;
1423         # default is to use -absolute url() i.e. $my_uri
1424         my $href = $params{-full} ? $my_url : $my_uri;
1425
1426         # implicit -replay, must be first of implicit params
1427         $params{-replay} = 1 if (keys %params == 1 && $params{-anchor});
1428
1429         $params{'project'} = $project unless exists $params{'project'};
1430
1431         if ($params{-replay}) {
1432                 while (my ($name, $symbol) = each %cgi_param_mapping) {
1433                         if (!exists $params{$name}) {
1434                                 $params{$name} = $input_params{$name};
1435                         }
1436                 }
1437         }
1438
1439         my $use_pathinfo = gitweb_check_feature('pathinfo');
1440         if (defined $params{'project'} &&
1441             (exists $params{-path_info} ? $params{-path_info} : $use_pathinfo)) {
1442                 # try to put as many parameters as possible in PATH_INFO:
1443                 #   - project name
1444                 #   - action
1445                 #   - hash_parent or hash_parent_base:/file_parent
1446                 #   - hash or hash_base:/filename
1447                 #   - the snapshot_format as an appropriate suffix
1448
1449                 # When the script is the root DirectoryIndex for the domain,
1450                 # $href here would be something like http://gitweb.example.com/
1451                 # Thus, we strip any trailing / from $href, to spare us double
1452                 # slashes in the final URL
1453                 $href =~ s,/$,,;
1454
1455                 # Then add the project name, if present
1456                 $href .= "/".esc_path_info($params{'project'});
1457                 delete $params{'project'};
1458
1459                 # since we destructively absorb parameters, we keep this
1460                 # boolean that remembers if we're handling a snapshot
1461                 my $is_snapshot = $params{'action'} eq 'snapshot';
1462
1463                 # Summary just uses the project path URL, any other action is
1464                 # added to the URL
1465                 if (defined $params{'action'}) {
1466                         $href .= "/".esc_path_info($params{'action'})
1467                                 unless $params{'action'} eq 'summary';
1468                         delete $params{'action'};
1469                 }
1470
1471                 # Next, we put hash_parent_base:/file_parent..hash_base:/file_name,
1472                 # stripping nonexistent or useless pieces
1473                 $href .= "/" if ($params{'hash_base'} || $params{'hash_parent_base'}
1474                         || $params{'hash_parent'} || $params{'hash'});
1475                 if (defined $params{'hash_base'}) {
1476                         if (defined $params{'hash_parent_base'}) {
1477                                 $href .= esc_path_info($params{'hash_parent_base'});
1478                                 # skip the file_parent if it's the same as the file_name
1479                                 if (defined $params{'file_parent'}) {
1480                                         if (defined $params{'file_name'} && $params{'file_parent'} eq $params{'file_name'}) {
1481                                                 delete $params{'file_parent'};
1482                                         } elsif ($params{'file_parent'} !~ /\.\./) {
1483                                                 $href .= ":/".esc_path_info($params{'file_parent'});
1484                                                 delete $params{'file_parent'};
1485                                         }
1486                                 }
1487                                 $href .= "..";
1488                                 delete $params{'hash_parent'};
1489                                 delete $params{'hash_parent_base'};
1490                         } elsif (defined $params{'hash_parent'}) {
1491                                 $href .= esc_path_info($params{'hash_parent'}). "..";
1492                                 delete $params{'hash_parent'};
1493                         }
1494
1495                         $href .= esc_path_info($params{'hash_base'});
1496                         if (defined $params{'file_name'} && $params{'file_name'} !~ /\.\./) {
1497                                 $href .= ":/".esc_path_info($params{'file_name'});
1498                                 delete $params{'file_name'};
1499                         }
1500                         delete $params{'hash'};
1501                         delete $params{'hash_base'};
1502                 } elsif (defined $params{'hash'}) {
1503                         $href .= esc_path_info($params{'hash'});
1504                         delete $params{'hash'};
1505                 }
1506
1507                 # If the action was a snapshot, we can absorb the
1508                 # snapshot_format parameter too
1509                 if ($is_snapshot) {
1510                         my $fmt = $params{'snapshot_format'};
1511                         # snapshot_format should always be defined when href()
1512                         # is called, but just in case some code forgets, we
1513                         # fall back to the default
1514                         $fmt ||= $snapshot_fmts[0];
1515                         $href .= $known_snapshot_formats{$fmt}{'suffix'};
1516                         delete $params{'snapshot_format'};
1517                 }
1518         }
1519
1520         # now encode the parameters explicitly
1521         my @result = ();
1522         for (my $i = 0; $i < @cgi_param_mapping; $i += 2) {
1523                 my ($name, $symbol) = ($cgi_param_mapping[$i], $cgi_param_mapping[$i+1]);
1524                 if (defined $params{$name}) {
1525                         if (ref($params{$name}) eq "ARRAY") {
1526                                 foreach my $par (@{$params{$name}}) {
1527                                         push @result, $symbol . "=" . esc_param($par);
1528                                 }
1529                         } else {
1530                                 push @result, $symbol . "=" . esc_param($params{$name});
1531                         }
1532                 }
1533         }
1534         $href .= "?" . join(';', @result) if scalar @result;
1535
1536         # final transformation: trailing spaces must be escaped (URI-encoded)
1537         $href =~ s/(\s+)$/CGI::escape($1)/e;
1538
1539         if ($params{-anchor}) {
1540                 $href .= "#".esc_param($params{-anchor});
1541         }
1542
1543         return $href;
1544 }
1545
1546
1547 ## ======================================================================
1548 ## validation, quoting/unquoting and escaping
1549
1550 sub is_valid_action {
1551         my $input = shift;
1552         return undef unless exists $actions{$input};
1553         return 1;
1554 }
1555
1556 sub is_valid_project {
1557         my $input = shift;
1558
1559         return unless defined $input;
1560         if (!is_valid_pathname($input) ||
1561                 !(-d "$projectroot/$input") ||
1562                 !check_export_ok("$projectroot/$input") ||
1563                 ($strict_export && !project_in_list($input))) {
1564                 return undef;
1565         } else {
1566                 return 1;
1567         }
1568 }
1569
1570 sub is_valid_pathname {
1571         my $input = shift;
1572
1573         return undef unless defined $input;
1574         # no '.' or '..' as elements of path, i.e. no '.' or '..'
1575         # at the beginning, at the end, and between slashes.
1576         # also this catches doubled slashes
1577         if ($input =~ m!(^|/)(|\.|\.\.)(/|$)!) {
1578                 return undef;
1579         }
1580         # no null characters
1581         if ($input =~ m!\0!) {
1582                 return undef;
1583         }
1584         return 1;
1585 }
1586
1587 sub is_valid_ref_format {
1588         my $input = shift;
1589
1590         return undef unless defined $input;
1591         # restrictions on ref name according to git-check-ref-format
1592         if ($input =~ m!(/\.|\.\.|[\000-\040\177 ~^:?*\[]|/$)!) {
1593                 return undef;
1594         }
1595         return 1;
1596 }
1597
1598 sub is_valid_refname {
1599         my $input = shift;
1600
1601         return undef unless defined $input;
1602         # textual hashes are O.K.
1603         if ($input =~ m/^[0-9a-fA-F]{40}$/) {
1604                 return 1;
1605         }
1606         # it must be correct pathname
1607         is_valid_pathname($input) or return undef;
1608         # check git-check-ref-format restrictions
1609         is_valid_ref_format($input) or return undef;
1610         return 1;
1611 }
1612
1613 # decode sequences of octets in utf8 into Perl's internal form,
1614 # which is utf-8 with utf8 flag set if needed.  gitweb writes out
1615 # in utf-8 thanks to "binmode STDOUT, ':utf8'" at beginning
1616 sub to_utf8 {
1617         my $str = shift;
1618         return undef unless defined $str;
1619
1620         if (utf8::is_utf8($str) || utf8::decode($str)) {
1621                 return $str;
1622         } else {
1623                 return $encode_object->decode($str, Encode::FB_DEFAULT);
1624         }
1625 }
1626
1627 # quote unsafe chars, but keep the slash, even when it's not
1628 # correct, but quoted slashes look too horrible in bookmarks
1629 sub esc_param {
1630         my $str = shift;
1631         return undef unless defined $str;
1632         $str =~ s/([^A-Za-z0-9\-_.~()\/:@ ]+)/CGI::escape($1)/eg;
1633         $str =~ s/ /\+/g;
1634         return $str;
1635 }
1636
1637 # the quoting rules for path_info fragment are slightly different
1638 sub esc_path_info {
1639         my $str = shift;
1640         return undef unless defined $str;
1641
1642         # path_info doesn't treat '+' as space (specially), but '?' must be escaped
1643         $str =~ s/([^A-Za-z0-9\-_.~();\/;:@&= +]+)/CGI::escape($1)/eg;
1644
1645         return $str;
1646 }
1647
1648 # quote unsafe chars in whole URL, so some characters cannot be quoted
1649 sub esc_url {
1650         my $str = shift;
1651         return undef unless defined $str;
1652         $str =~ s/([^A-Za-z0-9\-_.~();\/;?:@&= ]+)/CGI::escape($1)/eg;
1653         $str =~ s/ /\+/g;
1654         return $str;
1655 }
1656
1657 # quote unsafe characters in HTML attributes
1658 sub esc_attr {
1659
1660         # for XHTML conformance escaping '"' to '&quot;' is not enough
1661         return esc_html(@_);
1662 }
1663
1664 # replace invalid utf8 character with SUBSTITUTION sequence
1665 sub esc_html {
1666         my $str = shift;
1667         my %opts = @_;
1668
1669         return undef unless defined $str;
1670
1671         $str = to_utf8($str);
1672         $str = $cgi->escapeHTML($str);
1673         if ($opts{'-nbsp'}) {
1674                 $str =~ s/ /&nbsp;/g;
1675         }
1676         $str =~ s|([[:cntrl:]])|(($1 ne "\t") ? quot_cec($1) : $1)|eg;
1677         return $str;
1678 }
1679
1680 # quote control characters and escape filename to HTML
1681 sub esc_path {
1682         my $str = shift;
1683         my %opts = @_;
1684
1685         return undef unless defined $str;
1686
1687         $str = to_utf8($str);
1688         $str = $cgi->escapeHTML($str);
1689         if ($opts{'-nbsp'}) {
1690                 $str =~ s/ /&nbsp;/g;
1691         }
1692         $str =~ s|([[:cntrl:]])|quot_cec($1)|eg;
1693         return $str;
1694 }
1695
1696 # Sanitize for use in XHTML + application/xml+xhtml (valid XML 1.0)
1697 sub sanitize {
1698         my $str = shift;
1699
1700         return undef unless defined $str;
1701
1702         $str = to_utf8($str);
1703         $str =~ s|([[:cntrl:]])|(index("\t\n\r", $1) != -1 ? $1 : quot_cec($1))|eg;
1704         return $str;
1705 }
1706
1707 # Make control characters "printable", using character escape codes (CEC)
1708 sub quot_cec {
1709         my $cntrl = shift;
1710         my %opts = @_;
1711         my %es = ( # character escape codes, aka escape sequences
1712                 "\t" => '\t',   # tab            (HT)
1713                 "\n" => '\n',   # line feed      (LF)
1714                 "\r" => '\r',   # carrige return (CR)
1715                 "\f" => '\f',   # form feed      (FF)
1716                 "\b" => '\b',   # backspace      (BS)
1717                 "\a" => '\a',   # alarm (bell)   (BEL)
1718                 "\e" => '\e',   # escape         (ESC)
1719                 "\013" => '\v', # vertical tab   (VT)
1720                 "\000" => '\0', # nul character  (NUL)
1721         );
1722         my $chr = ( (exists $es{$cntrl})
1723                     ? $es{$cntrl}
1724                     : sprintf('\%2x', ord($cntrl)) );
1725         if ($opts{-nohtml}) {
1726                 return $chr;
1727         } else {
1728                 return "<span class=\"cntrl\">$chr</span>";
1729         }
1730 }
1731
1732 # Alternatively use unicode control pictures codepoints,
1733 # Unicode "printable representation" (PR)
1734 sub quot_upr {
1735         my $cntrl = shift;
1736         my %opts = @_;
1737
1738         my $chr = sprintf('&#%04d;', 0x2400+ord($cntrl));
1739         if ($opts{-nohtml}) {
1740                 return $chr;
1741         } else {
1742                 return "<span class=\"cntrl\">$chr</span>";
1743         }
1744 }
1745
1746 # git may return quoted and escaped filenames
1747 sub unquote {
1748         my $str = shift;
1749
1750         sub unq {
1751                 my $seq = shift;
1752                 my %es = ( # character escape codes, aka escape sequences
1753                         't' => "\t",   # tab            (HT, TAB)
1754                         'n' => "\n",   # newline        (NL)
1755                         'r' => "\r",   # return         (CR)
1756                         'f' => "\f",   # form feed      (FF)
1757                         'b' => "\b",   # backspace      (BS)
1758                         'a' => "\a",   # alarm (bell)   (BEL)
1759                         'e' => "\e",   # escape         (ESC)
1760                         'v' => "\013", # vertical tab   (VT)
1761                 );
1762
1763                 if ($seq =~ m/^[0-7]{1,3}$/) {
1764                         # octal char sequence
1765                         return chr(oct($seq));
1766                 } elsif (exists $es{$seq}) {
1767                         # C escape sequence, aka character escape code
1768                         return $es{$seq};
1769                 }
1770                 # quoted ordinary character
1771                 return $seq;
1772         }
1773
1774         if ($str =~ m/^"(.*)"$/) {
1775                 # needs unquoting
1776                 $str = $1;
1777                 $str =~ s/\\([^0-7]|[0-7]{1,3})/unq($1)/eg;
1778         }
1779         return $str;
1780 }
1781
1782 # escape tabs (convert tabs to spaces)
1783 sub untabify {
1784         my $line = shift;
1785
1786         while ((my $pos = index($line, "\t")) != -1) {
1787                 if (my $count = (8 - ($pos % 8))) {
1788                         my $spaces = ' ' x $count;
1789                         $line =~ s/\t/$spaces/;
1790                 }
1791         }
1792
1793         return $line;
1794 }
1795
1796 sub project_in_list {
1797         my $project = shift;
1798         my @list = git_get_projects_list();
1799         return @list && scalar(grep { $_->{'path'} eq $project } @list);
1800 }
1801
1802 ## ----------------------------------------------------------------------
1803 ## HTML aware string manipulation
1804
1805 # Try to chop given string on a word boundary between position
1806 # $len and $len+$add_len. If there is no word boundary there,
1807 # chop at $len+$add_len. Do not chop if chopped part plus ellipsis
1808 # (marking chopped part) would be longer than given string.
1809 sub chop_str {
1810         my $str = shift;
1811         my $len = shift;
1812         my $add_len = shift || 10;
1813         my $where = shift || 'right'; # 'left' | 'center' | 'right'
1814
1815         # Make sure perl knows it is utf8 encoded so we don't
1816         # cut in the middle of a utf8 multibyte char.
1817         $str = to_utf8($str);
1818
1819         # allow only $len chars, but don't cut a word if it would fit in $add_len
1820         # if it doesn't fit, cut it if it's still longer than the dots we would add
1821         # remove chopped character entities entirely
1822
1823         # when chopping in the middle, distribute $len into left and right part
1824         # return early if chopping wouldn't make string shorter
1825         if ($where eq 'center') {
1826                 return $str if ($len + 5 >= length($str)); # filler is length 5
1827                 $len = int($len/2);
1828         } else {
1829                 return $str if ($len + 4 >= length($str)); # filler is length 4
1830         }
1831
1832         # regexps: ending and beginning with word part up to $add_len
1833         my $endre = qr/.{$len}\w{0,$add_len}/;
1834         my $begre = qr/\w{0,$add_len}.{$len}/;
1835
1836         if ($where eq 'left') {
1837                 $str =~ m/^(.*?)($begre)$/;
1838                 my ($lead, $body) = ($1, $2);
1839                 if (length($lead) > 4) {
1840                         $lead = " ...";
1841                 }
1842                 return "$lead$body";
1843
1844         } elsif ($where eq 'center') {
1845                 $str =~ m/^($endre)(.*)$/;
1846                 my ($left, $str)  = ($1, $2);
1847                 $str =~ m/^(.*?)($begre)$/;
1848                 my ($mid, $right) = ($1, $2);
1849                 if (length($mid) > 5) {
1850                         $mid = " ... ";
1851                 }
1852                 return "$left$mid$right";
1853
1854         } else {
1855                 $str =~ m/^($endre)(.*)$/;
1856                 my $body = $1;
1857                 my $tail = $2;
1858                 if (length($tail) > 4) {
1859                         $tail = "... ";
1860                 }
1861                 return "$body$tail";
1862         }
1863 }
1864
1865 # pass-through email filter, obfuscating it when possible
1866 sub email_obfuscate {
1867         our $email;
1868         my ($str) = @_;
1869         if ($email) {
1870                 $str = $email->escape_html($str);
1871                 # Stock HTML::Email::Obfuscate version likes to produce
1872                 # invalid XHTML...
1873                 $str =~ s#<(/?)B>#<$1b>#g;
1874                 return $str;
1875         } else {
1876                 $str = esc_html($str);
1877                 $str =~ s/@/&#x40;/;
1878                 return $str;
1879         }
1880 }
1881
1882 # takes the same arguments as chop_str, but also wraps a <span> around the
1883 # result with a title attribute if it does get chopped. Additionally, the
1884 # string is HTML-escaped.
1885 sub chop_and_escape_str {
1886         my ($str) = @_;
1887
1888         my $chopped = chop_str(@_);
1889         $str = to_utf8($str);
1890         if ($chopped eq $str) {
1891                 return email_obfuscate($chopped);
1892         } else {
1893                 $str =~ s/[[:cntrl:]]/?/g;
1894                 return $cgi->span({-title=>$str}, email_obfuscate($chopped));
1895         }
1896 }
1897
1898 # Highlight selected fragments of string, using given CSS class,
1899 # and escape HTML.  It is assumed that fragments do not overlap.
1900 # Regions are passed as list of pairs (array references).
1901 #
1902 # Example: esc_html_hl_regions("foobar", "mark", [ 0, 3 ]) returns
1903 # '<span class="mark">foo</span>bar'
1904 sub esc_html_hl_regions {
1905         my ($str, $css_class, @sel) = @_;
1906         my %opts = grep { ref($_) ne 'ARRAY' } @sel;
1907         @sel     = grep { ref($_) eq 'ARRAY' } @sel;
1908         return esc_html($str, %opts) unless @sel;
1909
1910         my $out = '';
1911         my $pos = 0;
1912
1913         for my $s (@sel) {
1914                 my ($begin, $end) = @$s;
1915
1916                 # Don't create empty <span> elements.
1917                 next if $end <= $begin;
1918
1919                 my $escaped = esc_html(substr($str, $begin, $end - $begin),
1920                                        %opts);
1921
1922                 $out .= esc_html(substr($str, $pos, $begin - $pos), %opts)
1923                         if ($begin - $pos > 0);
1924                 $out .= $cgi->span({-class => $css_class}, $escaped);
1925
1926                 $pos = $end;
1927         }
1928         $out .= esc_html(substr($str, $pos), %opts)
1929                 if ($pos < length($str));
1930
1931         return $out;
1932 }
1933
1934 # return positions of beginning and end of each match
1935 sub matchpos_list {
1936         my ($str, $regexp) = @_;
1937         return unless (defined $str && defined $regexp);
1938
1939         my @matches;
1940         while ($str =~ /$regexp/g) {
1941                 push @matches, [$-[0], $+[0]];
1942         }
1943         return @matches;
1944 }
1945
1946 # highlight match (if any), and escape HTML
1947 sub esc_html_match_hl {
1948         my ($str, $regexp) = @_;
1949         return esc_html($str) unless defined $regexp;
1950
1951         my @matches = matchpos_list($str, $regexp);
1952         return esc_html($str) unless @matches;
1953
1954         return esc_html_hl_regions($str, 'match', @matches);
1955 }
1956
1957
1958 # highlight match (if any) of shortened string, and escape HTML
1959 sub esc_html_match_hl_chopped {
1960         my ($str, $chopped, $regexp) = @_;
1961         return esc_html_match_hl($str, $regexp) unless defined $chopped;
1962
1963         my @matches = matchpos_list($str, $regexp);
1964         return esc_html($chopped) unless @matches;
1965
1966         # filter matches so that we mark chopped string
1967         my $tail = "... "; # see chop_str
1968         unless ($chopped =~ s/\Q$tail\E$//) {
1969                 $tail = '';
1970         }
1971         my $chop_len = length($chopped);
1972         my $tail_len = length($tail);
1973         my @filtered;
1974
1975         for my $m (@matches) {
1976                 if ($m->[0] > $chop_len) {
1977                         push @filtered, [ $chop_len, $chop_len + $tail_len ] if ($tail_len > 0);
1978                         last;
1979                 } elsif ($m->[1] > $chop_len) {
1980                         push @filtered, [ $m->[0], $chop_len + $tail_len ];
1981                         last;
1982                 }
1983                 push @filtered, $m;
1984         }
1985
1986         return esc_html_hl_regions($chopped . $tail, 'match', @filtered);
1987 }
1988
1989 ## ----------------------------------------------------------------------
1990 ## functions returning short strings
1991
1992 # CSS class for given age value (in seconds)
1993 sub age_class {
1994         my $age = shift;
1995
1996         if (!defined $age) {
1997                 return "noage";
1998         } elsif ($age < 60*60*2) {
1999                 return "age0";
2000         } elsif ($age < 60*60*24*2) {
2001                 return "age1";
2002         } else {
2003                 return "age2";
2004         }
2005 }
2006
2007 # convert age in seconds to "nn units ago" string
2008 sub age_string {
2009         my $age = shift;
2010         my $age_str;
2011
2012         if ($age > 60*60*24*365*2) {
2013                 $age_str = (int $age/60/60/24/365);
2014                 $age_str .= " years ago";
2015         } elsif ($age > 60*60*24*(365/12)*2) {
2016                 $age_str = int $age/60/60/24/(365/12);
2017                 $age_str .= " months ago";
2018         } elsif ($age > 60*60*24*7*2) {
2019                 $age_str = int $age/60/60/24/7;
2020                 $age_str .= " weeks ago";
2021         } elsif ($age > 60*60*24*2) {
2022                 $age_str = int $age/60/60/24;
2023                 $age_str .= " days ago";
2024         } elsif ($age > 60*60*2) {
2025                 $age_str = int $age/60/60;
2026                 $age_str .= " hours ago";
2027         } elsif ($age > 60*2) {
2028                 $age_str = int $age/60;
2029                 $age_str .= " min ago";
2030         } elsif ($age > 2) {
2031                 $age_str = int $age;
2032                 $age_str .= " sec ago";
2033         } else {
2034                 $age_str .= " right now";
2035         }
2036         return $age_str;
2037 }
2038
2039 use constant {
2040         S_IFINVALID => 0030000,
2041         S_IFGITLINK => 0160000,
2042 };
2043
2044 # submodule/subproject, a commit object reference
2045 sub S_ISGITLINK {
2046         my $mode = shift;
2047
2048         return (($mode & S_IFMT) == S_IFGITLINK)
2049 }
2050
2051 # convert file mode in octal to symbolic file mode string
2052 sub mode_str {
2053         my $mode = oct shift;
2054
2055         if (S_ISGITLINK($mode)) {
2056                 return 'm---------';
2057         } elsif (S_ISDIR($mode & S_IFMT)) {
2058                 return 'drwxr-xr-x';
2059         } elsif (S_ISLNK($mode)) {
2060                 return 'lrwxrwxrwx';
2061         } elsif (S_ISREG($mode)) {
2062                 # git cares only about the executable bit
2063                 if ($mode & S_IXUSR) {
2064                         return '-rwxr-xr-x';
2065                 } else {
2066                         return '-rw-r--r--';
2067                 };
2068         } else {
2069                 return '----------';
2070         }
2071 }
2072
2073 # convert file mode in octal to file type string
2074 sub file_type {
2075         my $mode = shift;
2076
2077         if ($mode !~ m/^[0-7]+$/) {
2078                 return $mode;
2079         } else {
2080                 $mode = oct $mode;
2081         }
2082
2083         if (S_ISGITLINK($mode)) {
2084                 return "submodule";
2085         } elsif (S_ISDIR($mode & S_IFMT)) {
2086                 return "directory";
2087         } elsif (S_ISLNK($mode)) {
2088                 return "symlink";
2089         } elsif (S_ISREG($mode)) {
2090                 return "file";
2091         } else {
2092                 return "unknown";
2093         }
2094 }
2095
2096 # convert file mode in octal to file type description string
2097 sub file_type_long {
2098         my $mode = shift;
2099
2100         if ($mode !~ m/^[0-7]+$/) {
2101                 return $mode;
2102         } else {
2103                 $mode = oct $mode;
2104         }
2105
2106         if (S_ISGITLINK($mode)) {
2107                 return "submodule";
2108         } elsif (S_ISDIR($mode & S_IFMT)) {
2109                 return "directory";
2110         } elsif (S_ISLNK($mode)) {
2111                 return "symlink";
2112         } elsif (S_ISREG($mode)) {
2113                 if ($mode & S_IXUSR) {
2114                         return "executable";
2115                 } else {
2116                         return "file";
2117                 };
2118         } else {
2119                 return "unknown";
2120         }
2121 }
2122
2123
2124 ## ----------------------------------------------------------------------
2125 ## functions returning short HTML fragments, or transforming HTML fragments
2126 ## which don't belong to other sections
2127
2128 # format line of commit message.
2129 sub format_log_line_html {
2130         my $line = shift;
2131
2132         $line = esc_html($line, -nbsp=>1);
2133         $line =~ s{
2134         \b
2135         (
2136             # The output of "git describe", e.g. v2.10.0-297-gf6727b0
2137             # or hadoop-20160921-113441-20-g094fb7d
2138             (?<!-) # see strbuf_check_tag_ref(). Tags can't start with -
2139             [A-Za-z0-9.-]+
2140             (?!\.) # refs can't end with ".", see check_refname_format()
2141             -g[0-9a-fA-F]{7,40}
2142             |
2143             # Just a normal looking Git SHA1
2144             [0-9a-fA-F]{7,40}
2145         )
2146         \b
2147     }{
2148                 $cgi->a({-href => href(action=>"object", hash=>$1),
2149                                         -class => "text"}, $1);
2150         }egx;
2151
2152         return $line;
2153 }
2154
2155 # format marker of refs pointing to given object
2156
2157 # the destination action is chosen based on object type and current context:
2158 # - for annotated tags, we choose the tag view unless it's the current view
2159 #   already, in which case we go to shortlog view
2160 # - for other refs, we keep the current view if we're in history, shortlog or
2161 #   log view, and select shortlog otherwise
2162 sub format_ref_marker {
2163         my ($refs, $id) = @_;
2164         my $markers = '';
2165
2166         if (defined $refs->{$id}) {
2167                 foreach my $ref (@{$refs->{$id}}) {
2168                         # this code exploits the fact that non-lightweight tags are the
2169                         # only indirect objects, and that they are the only objects for which
2170                         # we want to use tag instead of shortlog as action
2171                         my ($type, $name) = qw();
2172                         my $indirect = ($ref =~ s/\^\{\}$//);
2173                         # e.g. tags/v2.6.11 or heads/next
2174                         if ($ref =~ m!^(.*?)s?/(.*)$!) {
2175                                 $type = $1;
2176                                 $name = $2;
2177                         } else {
2178                                 $type = "ref";
2179                                 $name = $ref;
2180                         }
2181
2182                         my $class = $type;
2183                         $class .= " indirect" if $indirect;
2184
2185                         my $dest_action = "shortlog";
2186
2187                         if ($indirect) {
2188                                 $dest_action = "tag" unless $action eq "tag";
2189                         } elsif ($action =~ /^(history|(short)?log)$/) {
2190                                 $dest_action = $action;
2191                         }
2192
2193                         my $dest = "";
2194                         $dest .= "refs/" unless $ref =~ m!^refs/!;
2195                         $dest .= $ref;
2196
2197                         my $link = $cgi->a({
2198                                 -href => href(
2199                                         action=>$dest_action,
2200                                         hash=>$dest
2201                                 )}, esc_html($name));
2202
2203                         $markers .= " <span class=\"".esc_attr($class)."\" title=\"".esc_attr($ref)."\">" .
2204                                 $link . "</span>";
2205                 }
2206         }
2207
2208         if ($markers) {
2209                 return ' <span class="refs">'. $markers . '</span>';
2210         } else {
2211                 return "";
2212         }
2213 }
2214
2215 # format, perhaps shortened and with markers, title line
2216 sub format_subject_html {
2217         my ($long, $short, $href, $extra) = @_;
2218         $extra = '' unless defined($extra);
2219
2220         if (length($short) < length($long)) {
2221                 $long =~ s/[[:cntrl:]]/?/g;
2222                 return $cgi->a({-href => $href, -class => "list subject",
2223                                 -title => to_utf8($long)},
2224                        esc_html($short)) . $extra;
2225         } else {
2226                 return $cgi->a({-href => $href, -class => "list subject"},
2227                        esc_html($long)) . $extra;
2228         }
2229 }
2230
2231 # Rather than recomputing the url for an email multiple times, we cache it
2232 # after the first hit. This gives a visible benefit in views where the avatar
2233 # for the same email is used repeatedly (e.g. shortlog).
2234 # The cache is shared by all avatar engines (currently gravatar only), which
2235 # are free to use it as preferred. Since only one avatar engine is used for any
2236 # given page, there's no risk for cache conflicts.
2237 our %avatar_cache = ();
2238
2239 # Compute the picon url for a given email, by using the picon search service over at
2240 # http://www.cs.indiana.edu/picons/search.html
2241 sub picon_url {
2242         my $email = lc shift;
2243         if (!$avatar_cache{$email}) {
2244                 my ($user, $domain) = split('@', $email);
2245                 $avatar_cache{$email} =
2246                         "//www.cs.indiana.edu/cgi-pub/kinzler/piconsearch.cgi/" .
2247                         "$domain/$user/" .
2248                         "users+domains+unknown/up/single";
2249         }
2250         return $avatar_cache{$email};
2251 }
2252
2253 # Compute the gravatar url for a given email, if it's not in the cache already.
2254 # Gravatar stores only the part of the URL before the size, since that's the
2255 # one computationally more expensive. This also allows reuse of the cache for
2256 # different sizes (for this particular engine).
2257 sub gravatar_url {
2258         my $email = lc shift;
2259         my $size = shift;
2260         $avatar_cache{$email} ||=
2261                 "//www.gravatar.com/avatar/" .
2262                         Digest::MD5::md5_hex($email) . "?s=";
2263         return $avatar_cache{$email} . $size;
2264 }
2265
2266 # Insert an avatar for the given $email at the given $size if the feature
2267 # is enabled.
2268 sub git_get_avatar {
2269         my ($email, %opts) = @_;
2270         my $pre_white  = ($opts{-pad_before} ? "&nbsp;" : "");
2271         my $post_white = ($opts{-pad_after}  ? "&nbsp;" : "");
2272         $opts{-size} ||= 'default';
2273         my $size = $avatar_size{$opts{-size}} || $avatar_size{'default'};
2274         my $url = "";
2275         if ($git_avatar eq 'gravatar') {
2276                 $url = gravatar_url($email, $size);
2277         } elsif ($git_avatar eq 'picon') {
2278                 $url = picon_url($email);
2279         }
2280         # Other providers can be added by extending the if chain, defining $url
2281         # as needed. If no variant puts something in $url, we assume avatars
2282         # are completely disabled/unavailable.
2283         if ($url) {
2284                 return $pre_white .
2285                        "<img width=\"$size\" " .
2286                             "class=\"avatar\" " .
2287                             "src=\"".esc_url($url)."\" " .
2288                             "alt=\"\" " .
2289                        "/>" . $post_white;
2290         } else {
2291                 return "";
2292         }
2293 }
2294
2295 sub format_search_author {
2296         my ($author, $searchtype, $displaytext) = @_;
2297         my $have_search = gitweb_check_feature('search');
2298
2299         if ($have_search) {
2300                 my $performed = "";
2301                 if ($searchtype eq 'author') {
2302                         $performed = "authored";
2303                 } elsif ($searchtype eq 'committer') {
2304                         $performed = "committed";
2305                 }
2306
2307                 return $cgi->a({-href => href(action=>"search", hash=>$hash,
2308                                 searchtext=>$author,
2309                                 searchtype=>$searchtype), class=>"list",
2310                                 title=>"Search for commits $performed by $author"},
2311                                 $displaytext);
2312
2313         } else {
2314                 return $displaytext;
2315         }
2316 }
2317
2318 # format the author name of the given commit with the given tag
2319 # the author name is chopped and escaped according to the other
2320 # optional parameters (see chop_str).
2321 sub format_author_html {
2322         my $tag = shift;
2323         my $co = shift;
2324         my $author = chop_and_escape_str($co->{'author_name'}, @_);
2325         return "<$tag class=\"author\">" .
2326                format_search_author($co->{'author_name'}, "author",
2327                        git_get_avatar($co->{'author_email'}, -pad_after => 1) .
2328                        $author) .
2329                "</$tag>";
2330 }
2331
2332 # format git diff header line, i.e. "diff --(git|combined|cc) ..."
2333 sub format_git_diff_header_line {
2334         my $line = shift;
2335         my $diffinfo = shift;
2336         my ($from, $to) = @_;
2337
2338         if ($diffinfo->{'nparents'}) {
2339                 # combined diff
2340                 $line =~ s!^(diff (.*?) )"?.*$!$1!;
2341                 if ($to->{'href'}) {
2342                         $line .= $cgi->a({-href => $to->{'href'}, -class => "path"},
2343                                          esc_path($to->{'file'}));
2344                 } else { # file was deleted (no href)
2345                         $line .= esc_path($to->{'file'});
2346                 }
2347         } else {
2348                 # "ordinary" diff
2349                 $line =~ s!^(diff (.*?) )"?a/.*$!$1!;
2350                 if ($from->{'href'}) {
2351                         $line .= $cgi->a({-href => $from->{'href'}, -class => "path"},
2352                                          'a/' . esc_path($from->{'file'}));
2353                 } else { # file was added (no href)
2354                         $line .= 'a/' . esc_path($from->{'file'});
2355                 }
2356                 $line .= ' ';
2357                 if ($to->{'href'}) {
2358                         $line .= $cgi->a({-href => $to->{'href'}, -class => "path"},
2359                                          'b/' . esc_path($to->{'file'}));
2360                 } else { # file was deleted
2361                         $line .= 'b/' . esc_path($to->{'file'});
2362                 }
2363         }
2364
2365         return "<div class=\"diff header\">$line</div>\n";
2366 }
2367
2368 # format extended diff header line, before patch itself
2369 sub format_extended_diff_header_line {
2370         my $line = shift;
2371         my $diffinfo = shift;
2372         my ($from, $to) = @_;
2373
2374         # match <path>
2375         if ($line =~ s!^((copy|rename) from ).*$!$1! && $from->{'href'}) {
2376                 $line .= $cgi->a({-href=>$from->{'href'}, -class=>"path"},
2377                                        esc_path($from->{'file'}));
2378         }
2379         if ($line =~ s!^((copy|rename) to ).*$!$1! && $to->{'href'}) {
2380                 $line .= $cgi->a({-href=>$to->{'href'}, -class=>"path"},
2381                                  esc_path($to->{'file'}));
2382         }
2383         # match single <mode>
2384         if ($line =~ m/\s(\d{6})$/) {
2385                 $line .= '<span class="info"> (' .
2386                          file_type_long($1) .
2387                          ')</span>';
2388         }
2389         # match <hash>
2390         if ($line =~ m/^index [0-9a-fA-F]{40},[0-9a-fA-F]{40}/) {
2391                 # can match only for combined diff
2392                 $line = 'index ';
2393                 for (my $i = 0; $i < $diffinfo->{'nparents'}; $i++) {
2394                         if ($from->{'href'}[$i]) {
2395                                 $line .= $cgi->a({-href=>$from->{'href'}[$i],
2396                                                   -class=>"hash"},
2397                                                  substr($diffinfo->{'from_id'}[$i],0,7));
2398                         } else {
2399                                 $line .= '0' x 7;
2400                         }
2401                         # separator
2402                         $line .= ',' if ($i < $diffinfo->{'nparents'} - 1);
2403                 }
2404                 $line .= '..';
2405                 if ($to->{'href'}) {
2406                         $line .= $cgi->a({-href=>$to->{'href'}, -class=>"hash"},
2407                                          substr($diffinfo->{'to_id'},0,7));
2408                 } else {
2409                         $line .= '0' x 7;
2410                 }
2411
2412         } elsif ($line =~ m/^index [0-9a-fA-F]{40}..[0-9a-fA-F]{40}/) {
2413                 # can match only for ordinary diff
2414                 my ($from_link, $to_link);
2415                 if ($from->{'href'}) {
2416                         $from_link = $cgi->a({-href=>$from->{'href'}, -class=>"hash"},
2417                                              substr($diffinfo->{'from_id'},0,7));
2418                 } else {
2419                         $from_link = '0' x 7;
2420                 }
2421                 if ($to->{'href'}) {
2422                         $to_link = $cgi->a({-href=>$to->{'href'}, -class=>"hash"},
2423                                            substr($diffinfo->{'to_id'},0,7));
2424                 } else {
2425                         $to_link = '0' x 7;
2426                 }
2427                 my ($from_id, $to_id) = ($diffinfo->{'from_id'}, $diffinfo->{'to_id'});
2428                 $line =~ s!$from_id\.\.$to_id!$from_link..$to_link!;
2429         }
2430
2431         return $line . "<br/>\n";
2432 }
2433
2434 # format from-file/to-file diff header
2435 sub format_diff_from_to_header {
2436         my ($from_line, $to_line, $diffinfo, $from, $to, @parents) = @_;
2437         my $line;
2438         my $result = '';
2439
2440         $line = $from_line;
2441         #assert($line =~ m/^---/) if DEBUG;
2442         # no extra formatting for "^--- /dev/null"
2443         if (! $diffinfo->{'nparents'}) {
2444                 # ordinary (single parent) diff
2445                 if ($line =~ m!^--- "?a/!) {
2446                         if ($from->{'href'}) {
2447                                 $line = '--- a/' .
2448                                         $cgi->a({-href=>$from->{'href'}, -class=>"path"},
2449                                                 esc_path($from->{'file'}));
2450                         } else {
2451                                 $line = '--- a/' .
2452                                         esc_path($from->{'file'});
2453                         }
2454                 }
2455                 $result .= qq!<div class="diff from_file">$line</div>\n!;
2456
2457         } else {
2458                 # combined diff (merge commit)
2459                 for (my $i = 0; $i < $diffinfo->{'nparents'}; $i++) {
2460                         if ($from->{'href'}[$i]) {
2461                                 $line = '--- ' .
2462                                         $cgi->a({-href=>href(action=>"blobdiff",
2463                                                              hash_parent=>$diffinfo->{'from_id'}[$i],
2464                                                              hash_parent_base=>$parents[$i],
2465                                                              file_parent=>$from->{'file'}[$i],
2466                                                              hash=>$diffinfo->{'to_id'},
2467                                                              hash_base=>$hash,
2468                                                              file_name=>$to->{'file'}),
2469                                                  -class=>"path",
2470                                                  -title=>"diff" . ($i+1)},
2471                                                 $i+1) .
2472                                         '/' .
2473                                         $cgi->a({-href=>$from->{'href'}[$i], -class=>"path"},
2474                                                 esc_path($from->{'file'}[$i]));
2475                         } else {
2476                                 $line = '--- /dev/null';
2477                         }
2478                         $result .= qq!<div class="diff from_file">$line</div>\n!;
2479                 }
2480         }
2481
2482         $line = $to_line;
2483         #assert($line =~ m/^\+\+\+/) if DEBUG;
2484         # no extra formatting for "^+++ /dev/null"
2485         if ($line =~ m!^\+\+\+ "?b/!) {
2486                 if ($to->{'href'}) {
2487                         $line = '+++ b/' .
2488                                 $cgi->a({-href=>$to->{'href'}, -class=>"path"},
2489                                         esc_path($to->{'file'}));
2490                 } else {
2491                         $line = '+++ b/' .
2492                                 esc_path($to->{'file'});
2493                 }
2494         }
2495         $result .= qq!<div class="diff to_file">$line</div>\n!;
2496
2497         return $result;
2498 }
2499
2500 # create note for patch simplified by combined diff
2501 sub format_diff_cc_simplified {
2502         my ($diffinfo, @parents) = @_;
2503         my $result = '';
2504
2505         $result .= "<div class=\"diff header\">" .
2506                    "diff --cc ";
2507         if (!is_deleted($diffinfo)) {
2508                 $result .= $cgi->a({-href => href(action=>"blob",
2509                                                   hash_base=>$hash,
2510                                                   hash=>$diffinfo->{'to_id'},
2511                                                   file_name=>$diffinfo->{'to_file'}),
2512                                     -class => "path"},
2513                                    esc_path($diffinfo->{'to_file'}));
2514         } else {
2515                 $result .= esc_path($diffinfo->{'to_file'});
2516         }
2517         $result .= "</div>\n" . # class="diff header"
2518                    "<div class=\"diff nodifferences\">" .
2519                    "Simple merge" .
2520                    "</div>\n"; # class="diff nodifferences"
2521
2522         return $result;
2523 }
2524
2525 sub diff_line_class {
2526         my ($line, $from, $to) = @_;
2527
2528         # ordinary diff
2529         my $num_sign = 1;
2530         # combined diff
2531         if ($from && $to && ref($from->{'href'}) eq "ARRAY") {
2532                 $num_sign = scalar @{$from->{'href'}};
2533         }
2534
2535         my @diff_line_classifier = (
2536                 { regexp => qr/^\@\@{$num_sign} /, class => "chunk_header"},
2537                 { regexp => qr/^\\/,               class => "incomplete"  },
2538                 { regexp => qr/^ {$num_sign}/,     class => "ctx" },
2539                 # classifier for context must come before classifier add/rem,
2540                 # or we would have to use more complicated regexp, for example
2541                 # qr/(?= {0,$m}\+)[+ ]{$num_sign}/, where $m = $num_sign - 1;
2542                 { regexp => qr/^[+ ]{$num_sign}/,   class => "add" },
2543                 { regexp => qr/^[- ]{$num_sign}/,   class => "rem" },
2544         );
2545         for my $clsfy (@diff_line_classifier) {
2546                 return $clsfy->{'class'}
2547                         if ($line =~ $clsfy->{'regexp'});
2548         }
2549
2550         # fallback
2551         return "";
2552 }
2553
2554 # assumes that $from and $to are defined and correctly filled,
2555 # and that $line holds a line of chunk header for unified diff
2556 sub format_unidiff_chunk_header {
2557         my ($line, $from, $to) = @_;
2558
2559         my ($from_text, $from_start, $from_lines, $to_text, $to_start, $to_lines, $section) =
2560                 $line =~ m/^\@{2} (-(\d+)(?:,(\d+))?) (\+(\d+)(?:,(\d+))?) \@{2}(.*)$/;
2561
2562         $from_lines = 0 unless defined $from_lines;
2563         $to_lines   = 0 unless defined $to_lines;
2564
2565         if ($from->{'href'}) {
2566                 $from_text = $cgi->a({-href=>"$from->{'href'}#l$from_start",
2567                                      -class=>"list"}, $from_text);
2568         }
2569         if ($to->{'href'}) {
2570                 $to_text   = $cgi->a({-href=>"$to->{'href'}#l$to_start",
2571                                      -class=>"list"}, $to_text);
2572         }
2573         $line = "<span class=\"chunk_info\">@@ $from_text $to_text @@</span>" .
2574                 "<span class=\"section\">" . esc_html($section, -nbsp=>1) . "</span>";
2575         return $line;
2576 }
2577
2578 # assumes that $from and $to are defined and correctly filled,
2579 # and that $line holds a line of chunk header for combined diff
2580 sub format_cc_diff_chunk_header {
2581         my ($line, $from, $to) = @_;
2582
2583         my ($prefix, $ranges, $section) = $line =~ m/^(\@+) (.*?) \@+(.*)$/;
2584         my (@from_text, @from_start, @from_nlines, $to_text, $to_start, $to_nlines);
2585
2586         @from_text = split(' ', $ranges);
2587         for (my $i = 0; $i < @from_text; ++$i) {
2588                 ($from_start[$i], $from_nlines[$i]) =
2589                         (split(',', substr($from_text[$i], 1)), 0);
2590         }
2591
2592         $to_text   = pop @from_text;
2593         $to_start  = pop @from_start;
2594         $to_nlines = pop @from_nlines;
2595
2596         $line = "<span class=\"chunk_info\">$prefix ";
2597         for (my $i = 0; $i < @from_text; ++$i) {
2598                 if ($from->{'href'}[$i]) {
2599                         $line .= $cgi->a({-href=>"$from->{'href'}[$i]#l$from_start[$i]",
2600                                           -class=>"list"}, $from_text[$i]);
2601                 } else {
2602                         $line .= $from_text[$i];
2603                 }
2604                 $line .= " ";
2605         }
2606         if ($to->{'href'}) {
2607                 $line .= $cgi->a({-href=>"$to->{'href'}#l$to_start",
2608                                   -class=>"list"}, $to_text);
2609         } else {
2610                 $line .= $to_text;
2611         }
2612         $line .= " $prefix</span>" .
2613                  "<span class=\"section\">" . esc_html($section, -nbsp=>1) . "</span>";
2614         return $line;
2615 }
2616
2617 # process patch (diff) line (not to be used for diff headers),
2618 # returning HTML-formatted (but not wrapped) line.
2619 # If the line is passed as a reference, it is treated as HTML and not
2620 # esc_html()'ed.
2621 sub format_diff_line {
2622         my ($line, $diff_class, $from, $to) = @_;
2623
2624         if (ref($line)) {
2625                 $line = $$line;
2626         } else {
2627                 chomp $line;
2628                 $line = untabify($line);
2629
2630                 if ($from && $to && $line =~ m/^\@{2} /) {
2631                         $line = format_unidiff_chunk_header($line, $from, $to);
2632                 } elsif ($from && $to && $line =~ m/^\@{3}/) {
2633                         $line = format_cc_diff_chunk_header($line, $from, $to);
2634                 } else {
2635                         $line = esc_html($line, -nbsp=>1);
2636                 }
2637         }
2638
2639         my $diff_classes = "diff";
2640         $diff_classes .= " $diff_class" if ($diff_class);
2641         $line = "<div class=\"$diff_classes\">$line</div>\n";
2642
2643         return $line;
2644 }
2645
2646 # Generates undef or something like "_snapshot_" or "snapshot (_tbz2_ _zip_)",
2647 # linked.  Pass the hash of the tree/commit to snapshot.
2648 sub format_snapshot_links {
2649         my ($hash) = @_;
2650         my $num_fmts = @snapshot_fmts;
2651         if ($num_fmts > 1) {
2652                 # A parenthesized list of links bearing format names.
2653                 # e.g. "snapshot (_tar.gz_ _zip_)"
2654                 return "snapshot (" . join(' ', map
2655                         $cgi->a({
2656                                 -href => href(
2657                                         action=>"snapshot",
2658                                         hash=>$hash,
2659                                         snapshot_format=>$_
2660                                 )
2661                         }, $known_snapshot_formats{$_}{'display'})
2662                 , @snapshot_fmts) . ")";
2663         } elsif ($num_fmts == 1) {
2664                 # A single "snapshot" link whose tooltip bears the format name.
2665                 # i.e. "_snapshot_"
2666                 my ($fmt) = @snapshot_fmts;
2667                 return
2668                         $cgi->a({
2669                                 -href => href(
2670                                         action=>"snapshot",
2671                                         hash=>$hash,
2672                                         snapshot_format=>$fmt
2673                                 ),
2674                                 -title => "in format: $known_snapshot_formats{$fmt}{'display'}"
2675                         }, "snapshot");
2676         } else { # $num_fmts == 0
2677                 return undef;
2678         }
2679 }
2680
2681 ## ......................................................................
2682 ## functions returning values to be passed, perhaps after some
2683 ## transformation, to other functions; e.g. returning arguments to href()
2684
2685 # returns hash to be passed to href to generate gitweb URL
2686 # in -title key it returns description of link
2687 sub get_feed_info {
2688         my $format = shift || 'Atom';
2689         my %res = (action => lc($format));
2690         my $matched_ref = 0;
2691
2692         # feed links are possible only for project views
2693         return unless (defined $project);
2694         # some views should link to OPML, or to generic project feed,
2695         # or don't have specific feed yet (so they should use generic)
2696         return if (!$action || $action =~ /^(?:tags|heads|forks|tag|search)$/x);
2697
2698         my $branch = undef;
2699         # branches refs uses 'refs/' + $get_branch_refs()[x] + '/' prefix
2700         # (fullname) to differentiate from tag links; this also makes
2701         # possible to detect branch links
2702         for my $ref (get_branch_refs()) {
2703                 if ((defined $hash_base && $hash_base =~ m!^refs/\Q$ref\E/(.*)$!) ||
2704                     (defined $hash      && $hash      =~ m!^refs/\Q$ref\E/(.*)$!)) {
2705                         $branch = $1;
2706                         $matched_ref = $ref;
2707                         last;
2708                 }
2709         }
2710         # find log type for feed description (title)
2711         my $type = 'log';
2712         if (defined $file_name) {
2713                 $type  = "history of $file_name";
2714                 $type .= "/" if ($action eq 'tree');
2715                 $type .= " on '$branch'" if (defined $branch);
2716         } else {
2717                 $type = "log of $branch" if (defined $branch);
2718         }
2719
2720         $res{-title} = $type;
2721         $res{'hash'} = (defined $branch ? "refs/$matched_ref/$branch" : undef);
2722         $res{'file_name'} = $file_name;
2723
2724         return %res;
2725 }
2726
2727 ## ----------------------------------------------------------------------
2728 ## git utility subroutines, invoking git commands
2729
2730 # returns path to the core git executable and the --git-dir parameter as list
2731 sub git_cmd {
2732         $number_of_git_cmds++;
2733         return $GIT, '--git-dir='.$git_dir;
2734 }
2735
2736 # quote the given arguments for passing them to the shell
2737 # quote_command("command", "arg 1", "arg with ' and ! characters")
2738 # => "'command' 'arg 1' 'arg with '\'' and '\!' characters'"
2739 # Try to avoid using this function wherever possible.
2740 sub quote_command {
2741         return join(' ',
2742                 map { my $a = $_; $a =~ s/(['!])/'\\$1'/g; "'$a'" } @_ );
2743 }
2744
2745 # get HEAD ref of given project as hash
2746 sub git_get_head_hash {
2747         return git_get_full_hash(shift, 'HEAD');
2748 }
2749
2750 sub git_get_full_hash {
2751         return git_get_hash(@_);
2752 }
2753
2754 sub git_get_short_hash {
2755         return git_get_hash(@_, '--short=7');
2756 }
2757
2758 sub git_get_hash {
2759         my ($project, $hash, @options) = @_;
2760         my $o_git_dir = $git_dir;
2761         my $retval = undef;
2762         $git_dir = "$projectroot/$project";
2763         if (open my $fd, '-|', git_cmd(), 'rev-parse',
2764             '--verify', '-q', @options, $hash) {
2765                 $retval = <$fd>;
2766                 chomp $retval if defined $retval;
2767                 close $fd;
2768         }
2769         if (defined $o_git_dir) {
2770                 $git_dir = $o_git_dir;
2771         }
2772         return $retval;
2773 }
2774
2775 # get type of given object
2776 sub git_get_type {
2777         my $hash = shift;
2778
2779         open my $fd, "-|", git_cmd(), "cat-file", '-t', $hash or return;
2780         my $type = <$fd>;
2781         close $fd or return;
2782         chomp $type;
2783         return $type;
2784 }
2785
2786 # repository configuration
2787 our $config_file = '';
2788 our %config;
2789
2790 # store multiple values for single key as anonymous array reference
2791 # single values stored directly in the hash, not as [ <value> ]
2792 sub hash_set_multi {
2793         my ($hash, $key, $value) = @_;
2794
2795         if (!exists $hash->{$key}) {
2796                 $hash->{$key} = $value;
2797         } elsif (!ref $hash->{$key}) {
2798                 $hash->{$key} = [ $hash->{$key}, $value ];
2799         } else {
2800                 push @{$hash->{$key}}, $value;
2801         }
2802 }
2803
2804 # return hash of git project configuration
2805 # optionally limited to some section, e.g. 'gitweb'
2806 sub git_parse_project_config {
2807         my $section_regexp = shift;
2808         my %config;
2809
2810         local $/ = "\0";
2811
2812         open my $fh, "-|", git_cmd(), "config", '-z', '-l',
2813                 or return;
2814
2815         while (my $keyval = <$fh>) {
2816                 chomp $keyval;
2817                 my ($key, $value) = split(/\n/, $keyval, 2);
2818
2819                 hash_set_multi(\%config, $key, $value)
2820                         if (!defined $section_regexp || $key =~ /^(?:$section_regexp)\./o);
2821         }
2822         close $fh;
2823
2824         return %config;
2825 }
2826
2827 # convert config value to boolean: 'true' or 'false'
2828 # no value, number > 0, 'true' and 'yes' values are true
2829 # rest of values are treated as false (never as error)
2830 sub config_to_bool {
2831         my $val = shift;
2832
2833         return 1 if !defined $val;             # section.key
2834
2835         # strip leading and trailing whitespace
2836         $val =~ s/^\s+//;
2837         $val =~ s/\s+$//;
2838
2839         return (($val =~ /^\d+$/ && $val) ||   # section.key = 1
2840                 ($val =~ /^(?:true|yes)$/i));  # section.key = true
2841 }
2842
2843 # convert config value to simple decimal number
2844 # an optional value suffix of 'k', 'm', or 'g' will cause the value
2845 # to be multiplied by 1024, 1048576, or 1073741824
2846 sub config_to_int {
2847         my $val = shift;
2848
2849         # strip leading and trailing whitespace
2850         $val =~ s/^\s+//;
2851         $val =~ s/\s+$//;
2852
2853         if (my ($num, $unit) = ($val =~ /^([0-9]*)([kmg])$/i)) {
2854                 $unit = lc($unit);
2855                 # unknown unit is treated as 1
2856                 return $num * ($unit eq 'g' ? 1073741824 :
2857                                $unit eq 'm' ?    1048576 :
2858                                $unit eq 'k' ?       1024 : 1);
2859         }
2860         return $val;
2861 }
2862
2863 # convert config value to array reference, if needed
2864 sub config_to_multi {
2865         my $val = shift;
2866
2867         return ref($val) ? $val : (defined($val) ? [ $val ] : []);
2868 }
2869
2870 sub git_get_project_config {
2871         my ($key, $type) = @_;
2872
2873         return unless defined $git_dir;
2874
2875         # key sanity check
2876         return unless ($key);
2877         # only subsection, if exists, is case sensitive,
2878         # and not lowercased by 'git config -z -l'
2879         if (my ($hi, $mi, $lo) = ($key =~ /^([^.]*)\.(.*)\.([^.]*)$/)) {
2880                 $lo =~ s/_//g;
2881                 $key = join(".", lc($hi), $mi, lc($lo));
2882                 return if ($lo =~ /\W/ || $hi =~ /\W/);
2883         } else {
2884                 $key = lc($key);
2885                 $key =~ s/_//g;
2886                 return if ($key =~ /\W/);
2887         }
2888         $key =~ s/^gitweb\.//;
2889
2890         # type sanity check
2891         if (defined $type) {
2892                 $type =~ s/^--//;
2893                 $type = undef
2894                         unless ($type eq 'bool' || $type eq 'int');
2895         }
2896
2897         # get config
2898         if (!defined $config_file ||
2899             $config_file ne "$git_dir/config") {
2900                 %config = git_parse_project_config('gitweb');
2901                 $config_file = "$git_dir/config";
2902         }
2903
2904         # check if config variable (key) exists
2905         return unless exists $config{"gitweb.$key"};
2906
2907         # ensure given type
2908         if (!defined $type) {
2909                 return $config{"gitweb.$key"};
2910         } elsif ($type eq 'bool') {
2911                 # backward compatibility: 'git config --bool' returns true/false
2912                 return config_to_bool($config{"gitweb.$key"}) ? 'true' : 'false';
2913         } elsif ($type eq 'int') {
2914                 return config_to_int($config{"gitweb.$key"});
2915         }
2916         return $config{"gitweb.$key"};
2917 }
2918
2919 # get hash of given path at given ref
2920 sub git_get_hash_by_path {
2921         my $base = shift;
2922         my $path = shift || return undef;
2923         my $type = shift;
2924
2925         $path =~ s,/+$,,;
2926
2927         open my $fd, "-|", git_cmd(), "ls-tree", $base, "--", $path
2928                 or die_error(500, "Open git-ls-tree failed");
2929         my $line = <$fd>;
2930         close $fd or return undef;
2931
2932         if (!defined $line) {
2933                 # there is no tree or hash given by $path at $base
2934                 return undef;
2935         }
2936
2937         #'100644 blob 0fa3f3a66fb6a137f6ec2c19351ed4d807070ffa  panic.c'
2938         $line =~ m/^([0-9]+) (.+) ([0-9a-fA-F]{40})\t/;
2939         if (defined $type && $type ne $2) {
2940                 # type doesn't match
2941                 return undef;
2942         }
2943         return $3;
2944 }
2945
2946 # get path of entry with given hash at given tree-ish (ref)
2947 # used to get 'from' filename for combined diff (merge commit) for renames
2948 sub git_get_path_by_hash {
2949         my $base = shift || return;
2950         my $hash = shift || return;
2951
2952         local $/ = "\0";
2953
2954         open my $fd, "-|", git_cmd(), "ls-tree", '-r', '-t', '-z', $base
2955                 or return undef;
2956         while (my $line = <$fd>) {
2957                 chomp $line;
2958
2959                 #'040000 tree 595596a6a9117ddba9fe379b6b012b558bac8423  gitweb'
2960                 #'100644 blob e02e90f0429be0d2a69b76571101f20b8f75530f  gitweb/README'
2961                 if ($line =~ m/(?:[0-9]+) (?:.+) $hash\t(.+)$/) {
2962                         close $fd;
2963                         return $1;
2964                 }
2965         }
2966         close $fd;
2967         return undef;
2968 }
2969
2970 ## ......................................................................
2971 ## git utility functions, directly accessing git repository
2972
2973 # get the value of config variable either from file named as the variable
2974 # itself in the repository ($GIT_DIR/$name file), or from gitweb.$name
2975 # configuration variable in the repository config file.
2976 sub git_get_file_or_project_config {
2977         my ($path, $name) = @_;
2978
2979         $git_dir = "$projectroot/$path";
2980         open my $fd, '<', "$git_dir/$name"
2981                 or return git_get_project_config($name);
2982         my $conf = <$fd>;
2983         close $fd;
2984         if (defined $conf) {
2985                 chomp $conf;
2986         }
2987         return $conf;
2988 }
2989
2990 sub git_get_project_description {
2991         my $path = shift;
2992         return git_get_file_or_project_config($path, 'description');
2993 }
2994
2995 sub git_get_project_category {
2996         my $path = shift;
2997         return git_get_file_or_project_config($path, 'category');
2998 }
2999
3000
3001 # supported formats:
3002 # * $GIT_DIR/ctags/<tagname> file (in 'ctags' subdirectory)
3003 #   - if its contents is a number, use it as tag weight,
3004 #   - otherwise add a tag with weight 1
3005 # * $GIT_DIR/ctags file, each line is a tag (with weight 1)
3006 #   the same value multiple times increases tag weight
3007 # * `gitweb.ctag' multi-valued repo config variable
3008 sub git_get_project_ctags {
3009         my $project = shift;
3010         my $ctags = {};
3011
3012         $git_dir = "$projectroot/$project";
3013         if (opendir my $dh, "$git_dir/ctags") {
3014                 my @files = grep { -f $_ } map { "$git_dir/ctags/$_" } readdir($dh);
3015                 foreach my $tagfile (@files) {
3016                         open my $ct, '<', $tagfile
3017                                 or next;
3018                         my $val = <$ct>;
3019                         chomp $val if $val;
3020                         close $ct;
3021
3022                         (my $ctag = $tagfile) =~ s#.*/##;
3023                         if ($val =~ /^\d+$/) {
3024                                 $ctags->{$ctag} = $val;
3025                         } else {
3026                                 $ctags->{$ctag} = 1;
3027                         }
3028                 }
3029                 closedir $dh;
3030
3031         } elsif (open my $fh, '<', "$git_dir/ctags") {
3032                 while (my $line = <$fh>) {
3033                         chomp $line;
3034                         $ctags->{$line}++ if $line;
3035                 }
3036                 close $fh;
3037
3038         } else {
3039                 my $taglist = config_to_multi(git_get_project_config('ctag'));
3040                 foreach my $tag (@$taglist) {
3041                         $ctags->{$tag}++;
3042                 }
3043         }
3044
3045         return $ctags;
3046 }
3047
3048 # return hash, where keys are content tags ('ctags'),
3049 # and values are sum of weights of given tag in every project
3050 sub git_gather_all_ctags {
3051         my $projects = shift;
3052         my $ctags = {};
3053
3054         foreach my $p (@$projects) {
3055                 foreach my $ct (keys %{$p->{'ctags'}}) {
3056                         $ctags->{$ct} += $p->{'ctags'}->{$ct};
3057                 }
3058         }
3059
3060         return $ctags;
3061 }
3062
3063 sub git_populate_project_tagcloud {
3064         my $ctags = shift;
3065
3066         # First, merge different-cased tags; tags vote on casing
3067         my %ctags_lc;
3068         foreach (keys %$ctags) {
3069                 $ctags_lc{lc $_}->{count} += $ctags->{$_};
3070                 if (not $ctags_lc{lc $_}->{topcount}
3071                     or $ctags_lc{lc $_}->{topcount} < $ctags->{$_}) {
3072                         $ctags_lc{lc $_}->{topcount} = $ctags->{$_};
3073                         $ctags_lc{lc $_}->{topname} = $_;
3074                 }
3075         }
3076
3077         my $cloud;
3078         my $matched = $input_params{'ctag'};
3079         if (eval { require HTML::TagCloud; 1; }) {
3080                 $cloud = HTML::TagCloud->new;
3081                 foreach my $ctag (sort keys %ctags_lc) {
3082                         # Pad the title with spaces so that the cloud looks
3083                         # less crammed.
3084                         my $title = esc_html($ctags_lc{$ctag}->{topname});
3085                         $title =~ s/ /&nbsp;/g;
3086                         $title =~ s/^/&nbsp;/g;
3087                         $title =~ s/$/&nbsp;/g;
3088                         if (defined $matched && $matched eq $ctag) {
3089                                 $title = qq(<span class="match">$title</span>);
3090                         }
3091                         $cloud->add($title, href(project=>undef, ctag=>$ctag),
3092                                     $ctags_lc{$ctag}->{count});
3093                 }
3094         } else {
3095                 $cloud = {};
3096                 foreach my $ctag (keys %ctags_lc) {
3097                         my $title = esc_html($ctags_lc{$ctag}->{topname}, -nbsp=>1);
3098                         if (defined $matched && $matched eq $ctag) {
3099                                 $title = qq(<span class="match">$title</span>);
3100                         }
3101                         $cloud->{$ctag}{count} = $ctags_lc{$ctag}->{count};
3102                         $cloud->{$ctag}{ctag} =
3103                                 $cgi->a({-href=>href(project=>undef, ctag=>$ctag)}, $title);
3104                 }
3105         }
3106         return $cloud;
3107 }
3108
3109 sub git_show_project_tagcloud {
3110         my ($cloud, $count) = @_;
3111         if (ref $cloud eq 'HTML::TagCloud') {
3112                 return $cloud->html_and_css($count);
3113         } else {
3114                 my @tags = sort { $cloud->{$a}->{'count'} <=> $cloud->{$b}->{'count'} } keys %$cloud;
3115                 return
3116                         '<div id="htmltagcloud"'.($project ? '' : ' align="center"').'>' .
3117                         join (', ', map {
3118                                 $cloud->{$_}->{'ctag'}
3119                         } splice(@tags, 0, $count)) .
3120                         '</div>';
3121         }
3122 }
3123
3124 sub git_get_project_url_list {
3125         my $path = shift;
3126
3127         $git_dir = "$projectroot/$path";
3128         open my $fd, '<', "$git_dir/cloneurl"
3129                 or return wantarray ?
3130                 @{ config_to_multi(git_get_project_config('url')) } :
3131                    config_to_multi(git_get_project_config('url'));
3132         my @git_project_url_list = map { chomp; $_ } <$fd>;
3133         close $fd;
3134
3135         return wantarray ? @git_project_url_list : \@git_project_url_list;
3136 }
3137
3138 sub git_get_projects_list {
3139         my $filter = shift || '';
3140         my $paranoid = shift;
3141         my @list;
3142
3143         if (-d $projects_list) {
3144                 # search in directory
3145                 my $dir = $projects_list;
3146                 # remove the trailing "/"
3147                 $dir =~ s!/+$!!;
3148                 my $pfxlen = length("$dir");
3149                 my $pfxdepth = ($dir =~ tr!/!!);
3150                 # when filtering, search only given subdirectory
3151                 if ($filter && !$paranoid) {
3152                         $dir .= "/$filter";
3153                         $dir =~ s!/+$!!;
3154                 }
3155
3156                 File::Find::find({
3157                         follow_fast => 1, # follow symbolic links
3158                         follow_skip => 2, # ignore duplicates
3159                         dangling_symlinks => 0, # ignore dangling symlinks, silently
3160                         wanted => sub {
3161                                 # global variables
3162                                 our $project_maxdepth;
3163                                 our $projectroot;
3164                                 # skip project-list toplevel, if we get it.
3165                                 return if (m!^[/.]$!);
3166                                 # only directories can be git repositories
3167                                 return unless (-d $_);
3168                                 # don't traverse too deep (Find is super slow on os x)
3169                                 # $project_maxdepth excludes depth of $projectroot
3170                                 if (($File::Find::name =~ tr!/!!) - $pfxdepth > $project_maxdepth) {
3171                                         $File::Find::prune = 1;
3172                                         return;
3173                                 }
3174
3175                                 my $path = substr($File::Find::name, $pfxlen + 1);
3176                                 # paranoidly only filter here
3177                                 if ($paranoid && $filter && $path !~ m!^\Q$filter\E/!) {
3178                                         next;
3179                                 }
3180                                 # we check related file in $projectroot
3181                                 if (check_export_ok("$projectroot/$path")) {
3182                                         push @list, { path => $path };
3183                                         $File::Find::prune = 1;
3184                                 }
3185                         },
3186                 }, "$dir");
3187
3188         } elsif (-f $projects_list) {
3189                 # read from file(url-encoded):
3190                 # 'git%2Fgit.git Linus+Torvalds'
3191                 # 'libs%2Fklibc%2Fklibc.git H.+Peter+Anvin'
3192                 # 'linux%2Fhotplug%2Fudev.git Greg+Kroah-Hartman'
3193                 open my $fd, '<', $projects_list or return;
3194         PROJECT:
3195                 while (my $line = <$fd>) {
3196                         chomp $line;
3197                         my ($path, $owner) = split ' ', $line;
3198                         $path = unescape($path);
3199                         $owner = unescape($owner);
3200                         if (!defined $path) {
3201                                 next;
3202                         }
3203                         # if $filter is rpovided, check if $path begins with $filter
3204                         if ($filter && $path !~ m!^\Q$filter\E/!) {
3205                                 next;
3206                         }
3207                         if (check_export_ok("$projectroot/$path")) {
3208                                 my $pr = {
3209                                         path => $path
3210                                 };
3211                                 if ($owner) {
3212                                         $pr->{'owner'} = to_utf8($owner);
3213                                 }
3214                                 push @list, $pr;
3215                         }
3216                 }
3217                 close $fd;
3218         }
3219         return @list;
3220 }
3221
3222 # written with help of Tree::Trie module (Perl Artistic License, GPL compatibile)
3223 # as side effects it sets 'forks' field to list of forks for forked projects
3224 sub filter_forks_from_projects_list {
3225         my $projects = shift;
3226
3227         my %trie; # prefix tree of directories (path components)
3228         # generate trie out of those directories that might contain forks
3229         foreach my $pr (@$projects) {
3230                 my $path = $pr->{'path'};
3231                 $path =~ s/\.git$//;      # forks of 'repo.git' are in 'repo/' directory
3232                 next if ($path =~ m!/$!); # skip non-bare repositories, e.g. 'repo/.git'
3233                 next unless ($path);      # skip '.git' repository: tests, git-instaweb
3234                 next unless (-d "$projectroot/$path"); # containing directory exists
3235                 $pr->{'forks'} = [];      # there can be 0 or more forks of project
3236
3237                 # add to trie
3238                 my @dirs = split('/', $path);
3239                 # walk the trie, until either runs out of components or out of trie
3240                 my $ref = \%trie;
3241                 while (scalar @dirs &&
3242                        exists($ref->{$dirs[0]})) {
3243                         $ref = $ref->{shift @dirs};
3244                 }
3245                 # create rest of trie structure from rest of components
3246                 foreach my $dir (@dirs) {
3247                         $ref = $ref->{$dir} = {};
3248                 }
3249                 # create end marker, store $pr as a data
3250                 $ref->{''} = $pr if (!exists $ref->{''});
3251         }
3252
3253         # filter out forks, by finding shortest prefix match for paths
3254         my @filtered;
3255  PROJECT:
3256         foreach my $pr (@$projects) {
3257                 # trie lookup
3258                 my $ref = \%trie;
3259         DIR:
3260                 foreach my $dir (split('/', $pr->{'path'})) {
3261                         if (exists $ref->{''}) {
3262                                 # found [shortest] prefix, is a fork - skip it
3263                                 push @{$ref->{''}{'forks'}}, $pr;
3264                                 next PROJECT;
3265                         }
3266                         if (!exists $ref->{$dir}) {
3267                                 # not in trie, cannot have prefix, not a fork
3268                                 push @filtered, $pr;
3269                                 next PROJECT;
3270                         }
3271                         # If the dir is there, we just walk one step down the trie.
3272                         $ref = $ref->{$dir};
3273                 }
3274                 # we ran out of trie
3275                 # (shouldn't happen: it's either no match, or end marker)
3276                 push @filtered, $pr;
3277         }
3278
3279         return @filtered;
3280 }
3281
3282 # note: fill_project_list_info must be run first,
3283 # for 'descr_long' and 'ctags' to be filled
3284 sub search_projects_list {
3285         my ($projlist, %opts) = @_;
3286         my $tagfilter  = $opts{'tagfilter'};
3287         my $search_re = $opts{'search_regexp'};
3288
3289         return @$projlist
3290                 unless ($tagfilter || $search_re);
3291
3292         # searching projects require filling to be run before it;
3293         fill_project_list_info($projlist,
3294                                $tagfilter  ? 'ctags' : (),
3295                                $search_re ? ('path', 'descr') : ());
3296         my @projects;
3297  PROJECT:
3298         foreach my $pr (@$projlist) {
3299
3300                 if ($tagfilter) {
3301                         next unless ref($pr->{'ctags'}) eq 'HASH';
3302                         next unless
3303                                 grep { lc($_) eq lc($tagfilter) } keys %{$pr->{'ctags'}};
3304                 }
3305
3306                 if ($search_re) {
3307                         next unless
3308                                 $pr->{'path'} =~ /$search_re/ ||
3309                                 $pr->{'descr_long'} =~ /$search_re/;
3310                 }
3311
3312                 push @projects, $pr;
3313         }
3314
3315         return @projects;
3316 }
3317
3318 our $gitweb_project_owner = undef;
3319 sub git_get_project_list_from_file {
3320
3321         return if (defined $gitweb_project_owner);
3322
3323         $gitweb_project_owner = {};
3324         # read from file (url-encoded):
3325         # 'git%2Fgit.git Linus+Torvalds'
3326         # 'libs%2Fklibc%2Fklibc.git H.+Peter+Anvin'
3327         # 'linux%2Fhotplug%2Fudev.git Greg+Kroah-Hartman'
3328         if (-f $projects_list) {
3329                 open(my $fd, '<', $projects_list);
3330                 while (my $line = <$fd>) {
3331                         chomp $line;
3332                         my ($pr, $ow) = split ' ', $line;
3333                         $pr = unescape($pr);
3334                         $ow = unescape($ow);
3335                         $gitweb_project_owner->{$pr} = to_utf8($ow);
3336                 }
3337                 close $fd;
3338         }
3339 }
3340
3341 sub git_get_project_owner {
3342         my $project = shift;
3343         my $owner;
3344
3345         return undef unless $project;
3346         $git_dir = "$projectroot/$project";
3347
3348         if (!defined $gitweb_project_owner) {
3349                 git_get_project_list_from_file();
3350         }
3351
3352         if (exists $gitweb_project_owner->{$project}) {
3353                 $owner = $gitweb_project_owner->{$project};
3354         }
3355         if (!defined $owner){
3356                 $owner = git_get_project_config('owner');
3357         }
3358         if (!defined $owner) {
3359                 $owner = get_file_owner("$git_dir");
3360         }
3361
3362         return $owner;
3363 }
3364
3365 sub git_get_last_activity {
3366         my ($path) = @_;
3367         my $fd;
3368
3369         $git_dir = "$projectroot/$path";
3370         open($fd, "-|", git_cmd(), 'for-each-ref',
3371              '--format=%(committer)',
3372              '--sort=-committerdate',
3373              '--count=1',
3374              map { "refs/$_" } get_branch_refs ()) or return;
3375         my $most_recent = <$fd>;
3376         close $fd or return;
3377         if (defined $most_recent &&
3378             $most_recent =~ / (\d+) [-+][01]\d\d\d$/) {
3379                 my $timestamp = $1;
3380                 my $age = time - $timestamp;
3381                 return ($age, age_string($age));
3382         }
3383         return (undef, undef);
3384 }
3385
3386 # Implementation note: when a single remote is wanted, we cannot use 'git
3387 # remote show -n' because that command always work (assuming it's a remote URL
3388 # if it's not defined), and we cannot use 'git remote show' because that would
3389 # try to make a network roundtrip. So the only way to find if that particular
3390 # remote is defined is to walk the list provided by 'git remote -v' and stop if
3391 # and when we find what we want.
3392 sub git_get_remotes_list {
3393         my $wanted = shift;
3394         my %remotes = ();
3395
3396         open my $fd, '-|' , git_cmd(), 'remote', '-v';
3397         return unless $fd;
3398         while (my $remote = <$fd>) {
3399                 chomp $remote;
3400                 $remote =~ s!\t(.*?)\s+\((\w+)\)$!!;
3401                 next if $wanted and not $remote eq $wanted;
3402                 my ($url, $key) = ($1, $2);
3403
3404                 $remotes{$remote} ||= { 'heads' => () };
3405                 $remotes{$remote}{$key} = $url;
3406         }
3407         close $fd or return;
3408         return wantarray ? %remotes : \%remotes;
3409 }
3410
3411 # Takes a hash of remotes as first parameter and fills it by adding the
3412 # available remote heads for each of the indicated remotes.
3413 sub fill_remote_heads {
3414         my $remotes = shift;
3415         my @heads = map { "remotes/$_" } keys %$remotes;
3416         my @remoteheads = git_get_heads_list(undef, @heads);
3417         foreach my $remote (keys %$remotes) {
3418                 $remotes->{$remote}{'heads'} = [ grep {
3419                         $_->{'name'} =~ s!^$remote/!!
3420                         } @remoteheads ];
3421         }
3422 }
3423
3424 sub git_get_references {
3425         my $type = shift || "";
3426         my %refs;
3427         # 5dc01c595e6c6ec9ccda4f6f69c131c0dd945f8c refs/tags/v2.6.11
3428         # c39ae07f393806ccf406ef966e9a15afc43cc36a refs/tags/v2.6.11^{}
3429         open my $fd, "-|", git_cmd(), "show-ref", "--dereference",
3430                 ($type ? ("--", "refs/$type") : ()) # use -- <pattern> if $type
3431                 or return;
3432
3433         while (my $line = <$fd>) {
3434                 chomp $line;
3435                 if ($line =~ m!^([0-9a-fA-F]{40})\srefs/($type.*)$!) {
3436                         if (defined $refs{$1}) {
3437                                 push @{$refs{$1}}, $2;
3438                         } else {
3439                                 $refs{$1} = [ $2 ];
3440                         }
3441                 }
3442         }
3443         close $fd or return;
3444         return \%refs;
3445 }
3446
3447 sub git_get_rev_name_tags {
3448         my $hash = shift || return undef;
3449
3450         open my $fd, "-|", git_cmd(), "name-rev", "--tags", $hash
3451                 or return;
3452         my $name_rev = <$fd>;
3453         close $fd;
3454
3455         if ($name_rev =~ m|^$hash tags/(.*)$|) {
3456                 return $1;
3457         } else {
3458                 # catches also '$hash undefined' output
3459                 return undef;
3460         }
3461 }
3462
3463 ## ----------------------------------------------------------------------
3464 ## parse to hash functions
3465
3466 sub parse_date {
3467         my $epoch = shift;
3468         my $tz = shift || "-0000";
3469
3470         my %date;
3471         my @months = ("Jan", "Feb", "Mar", "Apr", "May", "Jun", "Jul", "Aug", "Sep", "Oct", "Nov", "Dec");
3472         my @days = ("Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat");
3473         my ($sec, $min, $hour, $mday, $mon, $year, $wday, $yday) = gmtime($epoch);
3474         $date{'hour'} = $hour;
3475         $date{'minute'} = $min;
3476         $date{'mday'} = $mday;
3477         $date{'day'} = $days[$wday];
3478         $date{'month'} = $months[$mon];
3479         $date{'rfc2822'}   = sprintf "%s, %d %s %4d %02d:%02d:%02d +0000",
3480                              $days[$wday], $mday, $months[$mon], 1900+$year, $hour ,$min, $sec;
3481         $date{'mday-time'} = sprintf "%d %s %02d:%02d",
3482                              $mday, $months[$mon], $hour ,$min;
3483         $date{'iso-8601'}  = sprintf "%04d-%02d-%02dT%02d:%02d:%02dZ",
3484                              1900+$year, 1+$mon, $mday, $hour ,$min, $sec;
3485
3486         my ($tz_sign, $tz_hour, $tz_min) =
3487                 ($tz =~ m/^([-+])(\d\d)(\d\d)$/);
3488         $tz_sign = ($tz_sign eq '-' ? -1 : +1);
3489         my $local = $epoch + $tz_sign*((($tz_hour*60) + $tz_min)*60);
3490         ($sec, $min, $hour, $mday, $mon, $year, $wday, $yday) = gmtime($local);
3491         $date{'hour_local'} = $hour;
3492         $date{'minute_local'} = $min;
3493         $date{'tz_local'} = $tz;
3494         $date{'iso-tz'} = sprintf("%04d-%02d-%02d %02d:%02d:%02d %s",
3495                                   1900+$year, $mon+1, $mday,
3496                                   $hour, $min, $sec, $tz);
3497         return %date;
3498 }
3499
3500 sub parse_tag {
3501         my $tag_id = shift;
3502         my %tag;
3503         my @comment;
3504
3505         open my $fd, "-|", git_cmd(), "cat-file", "tag", $tag_id or return;
3506         $tag{'id'} = $tag_id;
3507         while (my $line = <$fd>) {
3508                 chomp $line;
3509                 if ($line =~ m/^object ([0-9a-fA-F]{40})$/) {
3510                         $tag{'object'} = $1;
3511                 } elsif ($line =~ m/^type (.+)$/) {
3512                         $tag{'type'} = $1;
3513                 } elsif ($line =~ m/^tag (.+)$/) {
3514                         $tag{'name'} = $1;
3515                 } elsif ($line =~ m/^tagger (.*) ([0-9]+) (.*)$/) {
3516                         $tag{'author'} = $1;
3517                         $tag{'author_epoch'} = $2;
3518                         $tag{'author_tz'} = $3;
3519                         if ($tag{'author'} =~ m/^([^<]+) <([^>]*)>/) {
3520                                 $tag{'author_name'}  = $1;
3521                                 $tag{'author_email'} = $2;
3522                         } else {
3523                                 $tag{'author_name'} = $tag{'author'};
3524                         }
3525                 } elsif ($line =~ m/--BEGIN/) {
3526                         push @comment, $line;
3527                         last;
3528                 } elsif ($line eq "") {
3529                         last;
3530                 }
3531         }
3532         push @comment, <$fd>;
3533         $tag{'comment'} = \@comment;
3534         close $fd or return;
3535         if (!defined $tag{'name'}) {
3536                 return
3537         };
3538         return %tag
3539 }
3540
3541 sub parse_commit_text {
3542         my ($commit_text, $withparents) = @_;
3543         my @commit_lines = split '\n', $commit_text;
3544         my %co;
3545
3546         pop @commit_lines; # Remove '\0'
3547
3548         if (! @commit_lines) {
3549                 return;
3550         }
3551
3552         my $header = shift @commit_lines;
3553         if ($header !~ m/^[0-9a-fA-F]{40}/) {
3554                 return;
3555         }
3556         ($co{'id'}, my @parents) = split ' ', $header;
3557         while (my $line = shift @commit_lines) {
3558                 last if $line eq "\n";
3559                 if ($line =~ m/^tree ([0-9a-fA-F]{40})$/) {
3560                         $co{'tree'} = $1;
3561                 } elsif ((!defined $withparents) && ($line =~ m/^parent ([0-9a-fA-F]{40})$/)) {
3562                         push @parents, $1;
3563                 } elsif ($line =~ m/^author (.*) ([0-9]+) (.*)$/) {
3564                         $co{'author'} = to_utf8($1);
3565                         $co{'author_epoch'} = $2;
3566                         $co{'author_tz'} = $3;
3567                         if ($co{'author'} =~ m/^([^<]+) <([^>]*)>/) {
3568                                 $co{'author_name'}  = $1;
3569                                 $co{'author_email'} = $2;
3570                         } else {
3571                                 $co{'author_name'} = $co{'author'};
3572                         }
3573                 } elsif ($line =~ m/^committer (.*) ([0-9]+) (.*)$/) {
3574                         $co{'committer'} = to_utf8($1);
3575                         $co{'committer_epoch'} = $2;
3576                         $co{'committer_tz'} = $3;
3577                         if ($co{'committer'} =~ m/^([^<]+) <([^>]*)>/) {
3578                                 $co{'committer_name'}  = $1;
3579                                 $co{'committer_email'} = $2;
3580                         } else {
3581                                 $co{'committer_name'} = $co{'committer'};
3582                         }
3583                 }
3584         }
3585         if (!defined $co{'tree'}) {
3586                 return;
3587         };
3588         $co{'parents'} = \@parents;
3589         $co{'parent'} = $parents[0];
3590
3591         foreach my $title (@commit_lines) {
3592                 $title =~ s/^    //;
3593                 if ($title ne "") {
3594                         $co{'title'} = chop_str($title, 80, 5);
3595                         # remove leading stuff of merges to make the interesting part visible
3596                         if (length($title) > 50) {
3597                                 $title =~ s/^Automatic //;
3598                                 $title =~ s/^merge (of|with) /Merge ... /i;
3599                                 if (length($title) > 50) {
3600                                         $title =~ s/(http|rsync):\/\///;
3601                                 }
3602                                 if (length($title) > 50) {
3603                                         $title =~ s/(master|www|rsync)\.//;
3604                                 }
3605                                 if (length($title) > 50) {
3606                                         $title =~ s/kernel.org:?//;
3607                                 }
3608                                 if (length($title) > 50) {
3609                                         $title =~ s/\/pub\/scm//;
3610                                 }
3611                         }
3612                         $co{'title_short'} = chop_str($title, 50, 5);
3613                         last;
3614                 }
3615         }
3616         if (! defined $co{'title'} || $co{'title'} eq "") {
3617                 $co{'title'} = $co{'title_short'} = '(no commit message)';
3618         }
3619         # remove added spaces
3620         foreach my $line (@commit_lines) {
3621                 $line =~ s/^    //;
3622         }
3623         $co{'comment'} = \@commit_lines;
3624
3625         my $age = time - $co{'committer_epoch'};
3626         $co{'age'} = $age;
3627         $co{'age_string'} = age_string($age);
3628         my ($sec, $min, $hour, $mday, $mon, $year, $wday, $yday) = gmtime($co{'committer_epoch'});
3629         if ($age > 60*60*24*7*2) {
3630                 $co{'age_string_date'} = sprintf "%4i-%02u-%02i", 1900 + $year, $mon+1, $mday;
3631                 $co{'age_string_age'} = $co{'age_string'};
3632         } else {
3633                 $co{'age_string_date'} = $co{'age_string'};
3634                 $co{'age_string_age'} = sprintf "%4i-%02u-%02i", 1900 + $year, $mon+1, $mday;
3635         }
3636         return %co;
3637 }
3638
3639 sub parse_commit {
3640         my ($commit_id) = @_;
3641         my %co;
3642
3643         local $/ = "\0";
3644
3645         open my $fd, "-|", git_cmd(), "rev-list",
3646                 "--parents",
3647                 "--header",
3648                 "--max-count=1",
3649                 $commit_id,
3650                 "--",
3651                 or die_error(500, "Open git-rev-list failed");
3652         %co = parse_commit_text(<$fd>, 1);
3653         close $fd;
3654
3655         return %co;
3656 }
3657
3658 sub parse_commits {
3659         my ($commit_id, $maxcount, $skip, $filename, @args) = @_;
3660         my @cos;
3661
3662         $maxcount ||= 1;
3663         $skip ||= 0;
3664
3665         local $/ = "\0";
3666
3667         open my $fd, "-|", git_cmd(), "rev-list",
3668                 "--header",
3669                 @args,
3670                 ("--max-count=" . $maxcount),
3671                 ("--skip=" . $skip),
3672                 @extra_options,
3673                 $commit_id,
3674                 "--",
3675                 ($filename ? ($filename) : ())
3676                 or die_error(500, "Open git-rev-list failed");
3677         while (my $line = <$fd>) {
3678                 my %co = parse_commit_text($line);
3679                 push @cos, \%co;
3680         }
3681         close $fd;
3682
3683         return wantarray ? @cos : \@cos;
3684 }
3685
3686 # parse line of git-diff-tree "raw" output
3687 sub parse_difftree_raw_line {
3688         my $line = shift;
3689         my %res;
3690
3691         # ':100644 100644 03b218260e99b78c6df0ed378e59ed9205ccc96d 3b93d5e7cc7f7dd4ebed13a5cc1a4ad976fc94d8 M   ls-files.c'
3692         # ':100644 100644 7f9281985086971d3877aca27704f2aaf9c448ce bc190ebc71bbd923f2b728e505408f5e54bd073a M   rev-tree.c'
3693         if ($line =~ m/^:([0-7]{6}) ([0-7]{6}) ([0-9a-fA-F]{40}) ([0-9a-fA-F]{40}) (.)([0-9]{0,3})\t(.*)$/) {
3694                 $res{'from_mode'} = $1;
3695                 $res{'to_mode'} = $2;
3696                 $res{'from_id'} = $3;
3697                 $res{'to_id'} = $4;
3698                 $res{'status'} = $5;
3699                 $res{'similarity'} = $6;
3700                 if ($res{'status'} eq 'R' || $res{'status'} eq 'C') { # renamed or copied
3701                         ($res{'from_file'}, $res{'to_file'}) = map { unquote($_) } split("\t", $7);
3702                 } else {
3703                         $res{'from_file'} = $res{'to_file'} = $res{'file'} = unquote($7);
3704                 }
3705         }
3706         # '::100755 100755 100755 60e79ca1b01bc8b057abe17ddab484699a7f5fdb 94067cc5f73388f33722d52ae02f44692bc07490 94067cc5f73388f33722d52ae02f44692bc07490 MR git-gui/git-gui.sh'
3707         # combined diff (for merge commit)
3708         elsif ($line =~ s/^(::+)((?:[0-7]{6} )+)((?:[0-9a-fA-F]{40} )+)([a-zA-Z]+)\t(.*)$//) {
3709                 $res{'nparents'}  = length($1);
3710                 $res{'from_mode'} = [ split(' ', $2) ];
3711                 $res{'to_mode'} = pop @{$res{'from_mode'}};
3712                 $res{'from_id'} = [ split(' ', $3) ];
3713                 $res{'to_id'} = pop @{$res{'from_id'}};
3714                 $res{'status'} = [ split('', $4) ];
3715                 $res{'to_file'} = unquote($5);
3716         }
3717         # 'c512b523472485aef4fff9e57b229d9d243c967f'
3718         elsif ($line =~ m/^([0-9a-fA-F]{40})$/) {
3719                 $res{'commit'} = $1;
3720         }
3721
3722         return wantarray ? %res : \%res;
3723 }
3724
3725 # wrapper: return parsed line of git-diff-tree "raw" output
3726 # (the argument might be raw line, or parsed info)
3727 sub parsed_difftree_line {
3728         my $line_or_ref = shift;
3729
3730         if (ref($line_or_ref) eq "HASH") {
3731                 # pre-parsed (or generated by hand)
3732                 return $line_or_ref;
3733         } else {
3734                 return parse_difftree_raw_line($line_or_ref);
3735         }
3736 }
3737
3738 # parse line of git-ls-tree output
3739 sub parse_ls_tree_line {
3740         my $line = shift;
3741         my %opts = @_;
3742         my %res;
3743
3744         if ($opts{'-l'}) {
3745                 #'100644 blob 0fa3f3a66fb6a137f6ec2c19351ed4d807070ffa   16717  panic.c'
3746                 $line =~ m/^([0-9]+) (.+) ([0-9a-fA-F]{40}) +(-|[0-9]+)\t(.+)$/s;
3747
3748                 $res{'mode'} = $1;
3749                 $res{'type'} = $2;
3750                 $res{'hash'} = $3;
3751                 $res{'size'} = $4;
3752                 if ($opts{'-z'}) {
3753                         $res{'name'} = $5;
3754                 } else {
3755                         $res{'name'} = unquote($5);
3756                 }
3757         } else {
3758                 #'100644 blob 0fa3f3a66fb6a137f6ec2c19351ed4d807070ffa  panic.c'
3759                 $line =~ m/^([0-9]+) (.+) ([0-9a-fA-F]{40})\t(.+)$/s;
3760
3761                 $res{'mode'} = $1;
3762                 $res{'type'} = $2;
3763                 $res{'hash'} = $3;
3764                 if ($opts{'-z'}) {
3765                         $res{'name'} = $4;
3766                 } else {
3767                         $res{'name'} = unquote($4);
3768                 }
3769         }
3770
3771         return wantarray ? %res : \%res;
3772 }
3773
3774 # generates _two_ hashes, references to which are passed as 2 and 3 argument
3775 sub parse_from_to_diffinfo {
3776         my ($diffinfo, $from, $to, @parents) = @_;
3777
3778         if ($diffinfo->{'nparents'}) {
3779                 # combined diff
3780                 $from->{'file'} = [];
3781                 $from->{'href'} = [];
3782                 fill_from_file_info($diffinfo, @parents)
3783                         unless exists $diffinfo->{'from_file'};
3784                 for (my $i = 0; $i < $diffinfo->{'nparents'}; $i++) {
3785                         $from->{'file'}[$i] =
3786                                 defined $diffinfo->{'from_file'}[$i] ?
3787                                         $diffinfo->{'from_file'}[$i] :
3788                                         $diffinfo->{'to_file'};
3789                         if ($diffinfo->{'status'}[$i] ne "A") { # not new (added) file
3790                                 $from->{'href'}[$i] = href(action=>"blob",
3791                                                            hash_base=>$parents[$i],
3792                                                            hash=>$diffinfo->{'from_id'}[$i],
3793                                                            file_name=>$from->{'file'}[$i]);
3794                         } else {
3795                                 $from->{'href'}[$i] = undef;
3796                         }
3797                 }
3798         } else {
3799                 # ordinary (not combined) diff
3800                 $from->{'file'} = $diffinfo->{'from_file'};
3801                 if ($diffinfo->{'status'} ne "A") { # not new (added) file
3802                         $from->{'href'} = href(action=>"blob", hash_base=>$hash_parent,
3803                                                hash=>$diffinfo->{'from_id'},
3804                                                file_name=>$from->{'file'});
3805                 } else {
3806                         delete $from->{'href'};
3807                 }
3808         }
3809
3810         $to->{'file'} = $diffinfo->{'to_file'};
3811         if (!is_deleted($diffinfo)) { # file exists in result
3812                 $to->{'href'} = href(action=>"blob", hash_base=>$hash,
3813                                      hash=>$diffinfo->{'to_id'},
3814                                      file_name=>$to->{'file'});
3815         } else {
3816                 delete $to->{'href'};
3817         }
3818 }
3819
3820 ## ......................................................................
3821 ## parse to array of hashes functions
3822
3823 sub git_get_heads_list {
3824         my ($limit, @classes) = @_;
3825         @classes = get_branch_refs() unless @classes;
3826         my @patterns = map { "refs/$_" } @classes;
3827         my @headslist;
3828
3829         open my $fd, '-|', git_cmd(), 'for-each-ref',
3830                 ($limit ? '--count='.($limit+1) : ()), '--sort=-committerdate',
3831                 '--format=%(objectname) %(refname) %(subject)%00%(committer)',
3832                 @patterns
3833                 or return;
3834         while (my $line = <$fd>) {
3835                 my %ref_item;
3836
3837                 chomp $line;
3838                 my ($refinfo, $committerinfo) = split(/\0/, $line);
3839                 my ($hash, $name, $title) = split(' ', $refinfo, 3);
3840                 my ($committer, $epoch, $tz) =
3841                         ($committerinfo =~ /^(.*) ([0-9]+) (.*)$/);
3842                 $ref_item{'fullname'}  = $name;
3843                 my $strip_refs = join '|', map { quotemeta } get_branch_refs();
3844                 $name =~ s!^refs/($strip_refs|remotes)/!!;
3845                 $ref_item{'name'} = $name;
3846                 # for refs neither in 'heads' nor 'remotes' we want to
3847                 # show their ref dir
3848                 my $ref_dir = (defined $1) ? $1 : '';
3849                 if ($ref_dir ne '' and $ref_dir ne 'heads' and $ref_dir ne 'remotes') {
3850                     $ref_item{'name'} .= ' (' . $ref_dir . ')';
3851                 }
3852
3853                 $ref_item{'id'}    = $hash;
3854                 $ref_item{'title'} = $title || '(no commit message)';
3855                 $ref_item{'epoch'} = $epoch;
3856                 if ($epoch) {
3857                         $ref_item{'age'} = age_string(time - $ref_item{'epoch'});
3858                 } else {
3859                         $ref_item{'age'} = "unknown";
3860                 }
3861
3862                 push @headslist, \%ref_item;
3863         }
3864         close $fd;
3865
3866         return wantarray ? @headslist : \@headslist;
3867 }
3868
3869 sub git_get_tags_list {
3870         my $limit = shift;
3871         my @tagslist;
3872
3873         open my $fd, '-|', git_cmd(), 'for-each-ref',
3874                 ($limit ? '--count='.($limit+1) : ()), '--sort=-creatordate',
3875                 '--format=%(objectname) %(objecttype) %(refname) '.
3876                 '%(*objectname) %(*objecttype) %(subject)%00%(creator)',
3877                 'refs/tags'
3878                 or return;
3879         while (my $line = <$fd>) {
3880                 my %ref_item;
3881
3882                 chomp $line;
3883                 my ($refinfo, $creatorinfo) = split(/\0/, $line);
3884                 my ($id, $type, $name, $refid, $reftype, $title) = split(' ', $refinfo, 6);
3885                 my ($creator, $epoch, $tz) =
3886                         ($creatorinfo =~ /^(.*) ([0-9]+) (.*)$/);
3887                 $ref_item{'fullname'} = $name;
3888                 $name =~ s!^refs/tags/!!;
3889
3890                 $ref_item{'type'} = $type;
3891                 $ref_item{'id'} = $id;
3892                 $ref_item{'name'} = $name;
3893                 if ($type eq "tag") {
3894                         $ref_item{'subject'} = $title;
3895                         $ref_item{'reftype'} = $reftype;
3896                         $ref_item{'refid'}   = $refid;
3897                 } else {
3898                         $ref_item{'reftype'} = $type;
3899                         $ref_item{'refid'}   = $id;
3900                 }
3901
3902                 if ($type eq "tag" || $type eq "commit") {
3903                         $ref_item{'epoch'} = $epoch;
3904                         if ($epoch) {
3905                                 $ref_item{'age'} = age_string(time - $ref_item{'epoch'});
3906                         } else {
3907                                 $ref_item{'age'} = "unknown";
3908                         }
3909                 }
3910
3911                 push @tagslist, \%ref_item;
3912         }
3913         close $fd;
3914
3915         return wantarray ? @tagslist : \@tagslist;
3916 }
3917
3918 ## ----------------------------------------------------------------------
3919 ## filesystem-related functions
3920
3921 sub get_file_owner {
3922         my $path = shift;
3923
3924         my ($dev, $ino, $mode, $nlink, $st_uid, $st_gid, $rdev, $size) = stat($path);
3925         my ($name, $passwd, $uid, $gid, $quota, $comment, $gcos, $dir, $shell) = getpwuid($st_uid);
3926         if (!defined $gcos) {
3927                 return undef;
3928         }
3929         my $owner = $gcos;
3930         $owner =~ s/[,;].*$//;
3931         return to_utf8($owner);
3932 }
3933
3934 # assume that file exists
3935 sub insert_file {
3936         my $filename = shift;
3937
3938         open my $fd, '<', $filename;
3939         print map { to_utf8($_) } <$fd>;
3940         close $fd;
3941 }
3942
3943 ## ......................................................................
3944 ## mimetype related functions
3945
3946 sub mimetype_guess_file {
3947         my $filename = shift;
3948         my $mimemap = shift;
3949         -r $mimemap or return undef;
3950
3951         my %mimemap;
3952         open(my $mh, '<', $mimemap) or return undef;
3953         while (<$mh>) {
3954                 next if m/^#/; # skip comments
3955                 my ($mimetype, @exts) = split(/\s+/);
3956                 foreach my $ext (@exts) {
3957                         $mimemap{$ext} = $mimetype;
3958                 }
3959         }
3960         close($mh);
3961
3962         $filename =~ /\.([^.]*)$/;
3963         return $mimemap{$1};
3964 }
3965
3966 sub mimetype_guess {
3967         my $filename = shift;
3968         my $mime;
3969         $filename =~ /\./ or return undef;
3970
3971         if ($mimetypes_file) {
3972                 my $file = $mimetypes_file;
3973                 if ($file !~ m!^/!) { # if it is relative path
3974                         # it is relative to project
3975                         $file = "$projectroot/$project/$file";
3976                 }
3977                 $mime = mimetype_guess_file($filename, $file);
3978         }
3979         $mime ||= mimetype_guess_file($filename, '/etc/mime.types');
3980         return $mime;
3981 }
3982
3983 sub blob_mimetype {
3984         my $fd = shift;
3985         my $filename = shift;
3986
3987         if ($filename) {
3988                 my $mime = mimetype_guess($filename);
3989                 $mime and return $mime;
3990         }
3991
3992         # just in case
3993         return $default_blob_plain_mimetype unless $fd;
3994
3995         if (-T $fd) {
3996                 return 'text/plain';
3997         } elsif (! $filename) {
3998                 return 'application/octet-stream';
3999         } elsif ($filename =~ m/\.png$/i) {
4000                 return 'image/png';
4001         } elsif ($filename =~ m/\.gif$/i) {
4002                 return 'image/gif';
4003         } elsif ($filename =~ m/\.jpe?g$/i) {
4004                 return 'image/jpeg';
4005         } else {
4006                 return 'application/octet-stream';
4007         }
4008 }
4009
4010 sub blob_contenttype {
4011         my ($fd, $file_name, $type) = @_;
4012
4013         $type ||= blob_mimetype($fd, $file_name);
4014         if ($type eq 'text/plain' && defined $default_text_plain_charset) {
4015                 $type .= "; charset=$default_text_plain_charset";
4016         }
4017
4018         return $type;
4019 }
4020
4021 # guess file syntax for syntax highlighting; return undef if no highlighting
4022 # the name of syntax can (in the future) depend on syntax highlighter used
4023 sub guess_file_syntax {
4024         my ($highlight, $file_name) = @_;
4025         return undef unless ($highlight && defined $file_name);
4026         my $basename = basename($file_name, '.in');
4027         return $highlight_basename{$basename}
4028                 if exists $highlight_basename{$basename};
4029
4030         $basename =~ /\.([^.]*)$/;
4031         my $ext = $1 or return undef;
4032         return $highlight_ext{$ext}
4033                 if exists $highlight_ext{$ext};
4034
4035         return undef;
4036 }
4037
4038 # run highlighter and return FD of its output,
4039 # or return original FD if no highlighting
4040 sub run_highlighter {
4041         my ($fd, $highlight, $syntax) = @_;
4042         return $fd unless ($highlight);
4043
4044         close $fd;
4045         my $syntax_arg = (defined $syntax) ? "--syntax $syntax" : "--force";
4046         open $fd, quote_command(git_cmd(), "cat-file", "blob", $hash)." | ".
4047                   $to_utf8_pipe_command.
4048                   quote_command($highlight_bin).
4049                   " --replace-tabs=8 --fragment $syntax_arg |"
4050                 or die_error(500, "Couldn't open file or run syntax highlighter");
4051         return $fd;
4052 }
4053
4054 ## ======================================================================
4055 ## functions printing HTML: header, footer, error page
4056
4057 sub get_page_title {
4058         my $title = to_utf8($site_name);
4059
4060         unless (defined $project) {
4061                 if (defined $project_filter) {
4062                         $title .= " - projects in '" . esc_path($project_filter) . "'";
4063                 }
4064                 return $title;
4065         }
4066         $title .= " - " . to_utf8($project);
4067
4068         return $title unless (defined $action);
4069         $title .= "/$action"; # $action is US-ASCII (7bit ASCII)
4070
4071         return $title unless (defined $file_name);
4072         $title .= " - " . esc_path($file_name);
4073         if ($action eq "tree" && $file_name !~ m|/$|) {
4074                 $title .= "/";
4075         }
4076
4077         return $title;
4078 }
4079
4080 sub get_content_type_html {
4081         # require explicit support from the UA if we are to send the page as
4082         # 'application/xhtml+xml', otherwise send it as plain old 'text/html'.
4083         # we have to do this because MSIE sometimes globs '*/*', pretending to
4084         # support xhtml+xml but choking when it gets what it asked for.
4085         if (defined $cgi->http('HTTP_ACCEPT') &&
4086             $cgi->http('HTTP_ACCEPT') =~ m/(,|;|\s|^)application\/xhtml\+xml(,|;|\s|$)/ &&
4087             $cgi->Accept('application/xhtml+xml') != 0) {
4088                 return 'application/xhtml+xml';
4089         } else {
4090                 return 'text/html';
4091         }
4092 }
4093
4094 sub print_feed_meta {
4095         if (defined $project) {
4096                 my %href_params = get_feed_info();
4097                 if (!exists $href_params{'-title'}) {
4098                         $href_params{'-title'} = 'log';
4099                 }
4100
4101                 foreach my $format (qw(RSS Atom)) {
4102                         my $type = lc($format);
4103                         my %link_attr = (
4104                                 '-rel' => 'alternate',
4105                                 '-title' => esc_attr("$project - $href_params{'-title'} - $format feed"),
4106                                 '-type' => "application/$type+xml"
4107                         );
4108
4109                         $href_params{'extra_options'} = undef;
4110                         $href_params{'action'} = $type;
4111                         $link_attr{'-href'} = href(%href_params);
4112                         print "<link ".
4113                               "rel=\"$link_attr{'-rel'}\" ".
4114                               "title=\"$link_attr{'-title'}\" ".
4115                               "href=\"$link_attr{'-href'}\" ".
4116                               "type=\"$link_attr{'-type'}\" ".
4117                               "/>\n";
4118
4119                         $href_params{'extra_options'} = '--no-merges';
4120                         $link_attr{'-href'} = href(%href_params);
4121                         $link_attr{'-title'} .= ' (no merges)';
4122                         print "<link ".
4123                               "rel=\"$link_attr{'-rel'}\" ".
4124                               "title=\"$link_attr{'-title'}\" ".
4125                               "href=\"$link_attr{'-href'}\" ".
4126                               "type=\"$link_attr{'-type'}\" ".
4127                               "/>\n";
4128                 }
4129
4130         } else {
4131                 printf('<link rel="alternate" title="%s projects list" '.
4132                        'href="%s" type="text/plain; charset=utf-8" />'."\n",
4133                        esc_attr($site_name), href(project=>undef, action=>"project_index"));
4134                 printf('<link rel="alternate" title="%s projects feeds" '.
4135                        'href="%s" type="text/x-opml" />'."\n",
4136                        esc_attr($site_name), href(project=>undef, action=>"opml"));
4137         }
4138 }
4139
4140 sub print_header_links {
4141         my $status = shift;
4142
4143         # print out each stylesheet that exist, providing backwards capability
4144         # for those people who defined $stylesheet in a config file
4145         if (defined $stylesheet) {
4146                 print '<link rel="stylesheet" type="text/css" href="'.esc_url($stylesheet).'"/>'."\n";
4147         } else {
4148                 foreach my $stylesheet (@stylesheets) {
4149                         next unless $stylesheet;
4150                         print '<link rel="stylesheet" type="text/css" href="'.esc_url($stylesheet).'"/>'."\n";
4151                 }
4152         }
4153         print_feed_meta()
4154                 if ($status eq '200 OK');
4155         if (defined $favicon) {
4156                 print qq(<link rel="shortcut icon" href=").esc_url($favicon).qq(" type="image/png" />\n);
4157         }
4158 }
4159
4160 sub print_nav_breadcrumbs_path {
4161         my $dirprefix = undef;
4162         while (my $part = shift) {
4163                 $dirprefix .= "/" if defined $dirprefix;
4164                 $dirprefix .= $part;
4165                 print $cgi->a({-href => href(project => undef,
4166                                              project_filter => $dirprefix,
4167                                              action => "project_list")},
4168                               esc_html($part)) . " / ";
4169         }
4170 }
4171
4172 sub print_nav_breadcrumbs {
4173         my %opts = @_;
4174
4175         for my $crumb (@extra_breadcrumbs, [ $home_link_str => $home_link ]) {
4176                 print $cgi->a({-href => esc_url($crumb->[1])}, $crumb->[0]) . " / ";
4177         }
4178         if (defined $project) {
4179                 my @dirname = split '/', $project;
4180                 my $projectbasename = pop @dirname;
4181                 print_nav_breadcrumbs_path(@dirname);
4182                 print $cgi->a({-href => href(action=>"summary")}, esc_html($projectbasename));
4183                 if (defined $action) {
4184                         my $action_print = $action ;
4185                         if (defined $opts{-action_extra}) {
4186                                 $action_print = $cgi->a({-href => href(action=>$action)},
4187                                         $action);
4188                         }
4189                         print " / $action_print";
4190                 }
4191                 if (defined $opts{-action_extra}) {
4192                         print " / $opts{-action_extra}";
4193                 }
4194                 print "\n";
4195         } elsif (defined $project_filter) {
4196                 print_nav_breadcrumbs_path(split '/', $project_filter);
4197         }
4198 }
4199
4200 sub print_search_form {
4201         if (!defined $searchtext) {
4202                 $searchtext = "";
4203         }
4204         my $search_hash;
4205         if (defined $hash_base) {
4206                 $search_hash = $hash_base;
4207         } elsif (defined $hash) {
4208                 $search_hash = $hash;
4209         } else {
4210                 $search_hash = "HEAD";
4211         }
4212         my $action = $my_uri;
4213         my $use_pathinfo = gitweb_check_feature('pathinfo');
4214         if ($use_pathinfo) {
4215                 $action .= "/".esc_url($project);
4216         }
4217         print $cgi->start_form(-method => "get", -action => $action) .
4218               "<div class=\"search\">\n" .
4219               (!$use_pathinfo &&
4220               $cgi->input({-name=>"p", -value=>$project, -type=>"hidden"}) . "\n") .
4221               $cgi->input({-name=>"a", -value=>"search", -type=>"hidden"}) . "\n" .
4222               $cgi->input({-name=>"h", -value=>$search_hash, -type=>"hidden"}) . "\n" .
4223               $cgi->popup_menu(-name => 'st', -default => 'commit',
4224                                -values => ['commit', 'grep', 'author', 'committer', 'pickaxe']) .
4225               " " . $cgi->a({-href => href(action=>"search_help"),
4226                              -title => "search help" }, "?") . " search:\n",
4227               $cgi->textfield(-name => "s", -value => $searchtext, -override => 1) . "\n" .
4228               "<span title=\"Extended regular expression\">" .
4229               $cgi->checkbox(-name => 'sr', -value => 1, -label => 're',
4230                              -checked => $search_use_regexp) .
4231               "</span>" .
4232               "</div>" .
4233               $cgi->end_form() . "\n";
4234 }
4235
4236 sub git_header_html {
4237         my $status = shift || "200 OK";
4238         my $expires = shift;
4239         my %opts = @_;
4240
4241         my $title = get_page_title();
4242         my $content_type = get_content_type_html();
4243         print $cgi->header(-type=>$content_type, -charset => 'utf-8',
4244                            -status=> $status, -expires => $expires)
4245                 unless ($opts{'-no_http_header'});
4246         my $mod_perl_version = $ENV{'MOD_PERL'} ? " $ENV{'MOD_PERL'}" : '';
4247         print <<EOF;
4248 <?xml version="1.0" encoding="utf-8"?>
4249 <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
4250 <html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en-US" lang="en-US">
4251 <!-- git web interface version $version, (C) 2005-2006, Kay Sievers <kay.sievers\@vrfy.org>, Christian Gierke -->
4252 <!-- git core binaries version $git_version -->
4253 <head>
4254 <meta http-equiv="content-type" content="$content_type; charset=utf-8"/>
4255 <meta name="generator" content="gitweb/$version git/$git_version$mod_perl_version"/>
4256 <meta name="robots" content="index, nofollow"/>
4257 <title>$title</title>
4258 EOF
4259         # the stylesheet, favicon etc urls won't work correctly with path_info
4260         # unless we set the appropriate base URL
4261         if ($ENV{'PATH_INFO'}) {
4262                 print "<base href=\"".esc_url($base_url)."\" />\n";
4263         }
4264         print_header_links($status);
4265
4266         if (defined $site_html_head_string) {
4267                 print to_utf8($site_html_head_string);
4268         }
4269
4270         print "</head>\n" .
4271               "<body>\n";
4272
4273         if (defined $site_header && -f $site_header) {
4274                 insert_file($site_header);
4275         }
4276
4277         print "<div class=\"page_header\">\n";
4278         if (defined $logo) {
4279                 print $cgi->a({-href => esc_url($logo_url),
4280                                -title => $logo_label},
4281                               $cgi->img({-src => esc_url($logo),
4282                                          -width => 72, -height => 27,
4283                                          -alt => "git",
4284                                          -class => "logo"}));
4285         }
4286         print_nav_breadcrumbs(%opts);
4287         print "</div>\n";
4288
4289         my $have_search = gitweb_check_feature('search');
4290         if (defined $project && $have_search) {
4291                 print_search_form();
4292         }
4293 }
4294
4295 sub git_footer_html {
4296         my $feed_class = 'rss_logo';
4297
4298         print "<div class=\"page_footer\">\n";
4299         if (defined $project) {
4300                 my $descr = git_get_project_description($project);
4301                 if (defined $descr) {
4302                         print "<div class=\"page_footer_text\">" . esc_html($descr) . "</div>\n";
4303                 }
4304
4305                 my %href_params = get_feed_info();
4306                 if (!%href_params) {
4307                         $feed_class .= ' generic';
4308                 }
4309                 $href_params{'-title'} ||= 'log';
4310
4311                 foreach my $format (qw(RSS Atom)) {
4312                         $href_params{'action'} = lc($format);
4313                         print $cgi->a({-href => href(%href_params),
4314                                       -title => "$href_params{'-title'} $format feed",
4315                                       -class => $feed_class}, $format)."\n";
4316                 }
4317
4318         } else {
4319                 print $cgi->a({-href => href(project=>undef, action=>"opml",
4320                                              project_filter => $project_filter),
4321                               -class => $feed_class}, "OPML") . " ";
4322                 print $cgi->a({-href => href(project=>undef, action=>"project_index",
4323                                              project_filter => $project_filter),
4324                               -class => $feed_class}, "TXT") . "\n";
4325         }
4326         print "</div>\n"; # class="page_footer"
4327
4328         if (defined $t0 && gitweb_check_feature('timed')) {
4329                 print "<div id=\"generating_info\">\n";
4330                 print 'This page took '.
4331                       '<span id="generating_time" class="time_span">'.
4332                       tv_interval($t0, [ gettimeofday() ]).
4333                       ' seconds </span>'.
4334                       ' and '.
4335                       '<span id="generating_cmd">'.
4336                       $number_of_git_cmds.
4337                       '</span> git commands '.
4338                       " to generate.\n";
4339                 print "</div>\n"; # class="page_footer"
4340         }
4341
4342         if (defined $site_footer && -f $site_footer) {
4343                 insert_file($site_footer);
4344         }
4345
4346         print qq!<script type="text/javascript" src="!.esc_url($javascript).qq!"></script>\n!;
4347         if (defined $action &&
4348             $action eq 'blame_incremental') {
4349                 print qq!<script type="text/javascript">\n!.
4350                       qq!startBlame("!. href(action=>"blame_data", -replay=>1) .qq!",\n!.
4351                       qq!           "!. href() .qq!");\n!.
4352                       qq!</script>\n!;
4353         } else {
4354                 my ($jstimezone, $tz_cookie, $datetime_class) =
4355                         gitweb_get_feature('javascript-timezone');
4356
4357                 print qq!<script type="text/javascript">\n!.
4358                       qq!window.onload = function () {\n!;
4359                 if (gitweb_check_feature('javascript-actions')) {
4360                         print qq!       fixLinks();\n!;
4361                 }
4362                 if ($jstimezone && $tz_cookie && $datetime_class) {
4363                         print qq!       var tz_cookie = { name: '$tz_cookie', expires: 14, path: '/' };\n!. # in days
4364                               qq!       onloadTZSetup('$jstimezone', tz_cookie, '$datetime_class');\n!;
4365                 }
4366                 print qq!};\n!.
4367                       qq!</script>\n!;
4368         }
4369
4370         print "</body>\n" .
4371               "</html>";
4372 }
4373
4374 # die_error(<http_status_code>, <error_message>[, <detailed_html_description>])
4375 # Example: die_error(404, 'Hash not found')
4376 # By convention, use the following status codes (as defined in RFC 2616):
4377 # 400: Invalid or missing CGI parameters, or
4378 #      requested object exists but has wrong type.
4379 # 403: Requested feature (like "pickaxe" or "snapshot") not enabled on
4380 #      this server or project.
4381 # 404: Requested object/revision/project doesn't exist.
4382 # 500: The server isn't configured properly, or
4383 #      an internal error occurred (e.g. failed assertions caused by bugs), or
4384 #      an unknown error occurred (e.g. the git binary died unexpectedly).
4385 # 503: The server is currently unavailable (because it is overloaded,
4386 #      or down for maintenance).  Generally, this is a temporary state.
4387 sub die_error {
4388         my $status = shift || 500;
4389         my $error = esc_html(shift) || "Internal Server Error";
4390         my $extra = shift;
4391         my %opts = @_;
4392
4393         my %http_responses = (
4394                 400 => '400 Bad Request',
4395                 403 => '403 Forbidden',
4396                 404 => '404 Not Found',
4397                 500 => '500 Internal Server Error',
4398                 503 => '503 Service Unavailable',
4399         );
4400         git_header_html($http_responses{$status}, undef, %opts);
4401         print <<EOF;
4402 <div class="page_body">
4403 <br /><br />
4404 $status - $error
4405 <br />
4406 EOF
4407         if (defined $extra) {
4408                 print "<hr />\n" .
4409                       "$extra\n";
4410         }
4411         print "</div>\n";
4412
4413         git_footer_html();
4414         goto DONE_GITWEB
4415                 unless ($opts{'-error_handler'});
4416 }
4417
4418 ## ----------------------------------------------------------------------
4419 ## functions printing or outputting HTML: navigation
4420
4421 sub git_print_page_nav {
4422         my ($current, $suppress, $head, $treehead, $treebase, $extra) = @_;
4423         $extra = '' if !defined $extra; # pager or formats
4424
4425         my @navs = qw(summary shortlog log commit commitdiff tree);
4426         if ($suppress) {
4427                 @navs = grep { $_ ne $suppress } @navs;
4428         }
4429
4430         my %arg = map { $_ => {action=>$_} } @navs;
4431         if (defined $head) {
4432                 for (qw(commit commitdiff)) {
4433                         $arg{$_}{'hash'} = $head;
4434                 }
4435                 if ($current =~ m/^(tree | log | shortlog | commit | commitdiff | search)$/x) {
4436                         for (qw(shortlog log)) {
4437                                 $arg{$_}{'hash'} = $head;
4438                         }
4439                 }
4440         }
4441
4442         $arg{'tree'}{'hash'} = $treehead if defined $treehead;
4443         $arg{'tree'}{'hash_base'} = $treebase if defined $treebase;
4444
4445         my @actions = gitweb_get_feature('actions');
4446         my %repl = (
4447                 '%' => '%',
4448                 'n' => $project,         # project name
4449                 'f' => $git_dir,         # project path within filesystem
4450                 'h' => $treehead || '',  # current hash ('h' parameter)
4451                 'b' => $treebase || '',  # hash base ('hb' parameter)
4452         );
4453         while (@actions) {
4454                 my ($label, $link, $pos) = splice(@actions,0,3);
4455                 # insert
4456                 @navs = map { $_ eq $pos ? ($_, $label) : $_ } @navs;
4457                 # munch munch
4458                 $link =~ s/%([%nfhb])/$repl{$1}/g;
4459                 $arg{$label}{'_href'} = $link;
4460         }
4461
4462         print "<div class=\"page_nav\">\n" .
4463                 (join " | ",
4464                  map { $_ eq $current ?
4465                        $_ : $cgi->a({-href => ($arg{$_}{_href} ? $arg{$_}{_href} : href(%{$arg{$_}}))}, "$_")
4466                  } @navs);
4467         print "<br/>\n$extra<br/>\n" .
4468               "</div>\n";
4469 }
4470
4471 # returns a submenu for the nagivation of the refs views (tags, heads,
4472 # remotes) with the current view disabled and the remotes view only
4473 # available if the feature is enabled
4474 sub format_ref_views {
4475         my ($current) = @_;
4476         my @ref_views = qw{tags heads};
4477         push @ref_views, 'remotes' if gitweb_check_feature('remote_heads');
4478         return join " | ", map {
4479                 $_ eq $current ? $_ :
4480                 $cgi->a({-href => href(action=>$_)}, $_)
4481         } @ref_views
4482 }
4483
4484 sub format_paging_nav {
4485         my ($action, $page, $has_next_link) = @_;
4486         my $paging_nav;
4487
4488
4489         if ($page > 0) {
4490                 $paging_nav .=
4491                         $cgi->a({-href => href(-replay=>1, page=>undef)}, "first") .
4492                         " &sdot; " .
4493                         $cgi->a({-href => href(-replay=>1, page=>$page-1),
4494                                  -accesskey => "p", -title => "Alt-p"}, "prev");
4495         } else {
4496                 $paging_nav .= "first &sdot; prev";
4497         }
4498
4499         if ($has_next_link) {
4500                 $paging_nav .= " &sdot; " .
4501                         $cgi->a({-href => href(-replay=>1, page=>$page+1),
4502                                  -accesskey => "n", -title => "Alt-n"}, "next");
4503         } else {
4504                 $paging_nav .= " &sdot; next";
4505         }
4506
4507         return $paging_nav;
4508 }
4509
4510 ## ......................................................................
4511 ## functions printing or outputting HTML: div
4512
4513 sub git_print_header_div {
4514         my ($action, $title, $hash, $hash_base) = @_;
4515         my %args = ();
4516
4517         $args{'action'} = $action;
4518         $args{'hash'} = $hash if $hash;
4519         $args{'hash_base'} = $hash_base if $hash_base;
4520
4521         print "<div class=\"header\">\n" .
4522               $cgi->a({-href => href(%args), -class => "title"},
4523               $title ? $title : $action) .
4524               "\n</div>\n";
4525 }
4526
4527 sub format_repo_url {
4528         my ($name, $url) = @_;
4529         return "<tr class=\"metadata_url\"><td>$name</td><td>$url</td></tr>\n";
4530 }
4531
4532 # Group output by placing it in a DIV element and adding a header.
4533 # Options for start_div() can be provided by passing a hash reference as the
4534 # first parameter to the function.
4535 # Options to git_print_header_div() can be provided by passing an array
4536 # reference. This must follow the options to start_div if they are present.
4537 # The content can be a scalar, which is output as-is, a scalar reference, which
4538 # is output after html escaping, an IO handle passed either as *handle or
4539 # *handle{IO}, or a function reference. In the latter case all following
4540 # parameters will be taken as argument to the content function call.
4541 sub git_print_section {
4542         my ($div_args, $header_args, $content);
4543         my $arg = shift;
4544         if (ref($arg) eq 'HASH') {
4545                 $div_args = $arg;
4546                 $arg = shift;
4547         }
4548         if (ref($arg) eq 'ARRAY') {
4549                 $header_args = $arg;
4550                 $arg = shift;
4551         }
4552         $content = $arg;
4553
4554         print $cgi->start_div($div_args);
4555         git_print_header_div(@$header_args);
4556
4557         if (ref($content) eq 'CODE') {
4558                 $content->(@_);
4559         } elsif (ref($content) eq 'SCALAR') {
4560                 print esc_html($$content);
4561         } elsif (ref($content) eq 'GLOB' or ref($content) eq 'IO::Handle') {
4562                 print <$content>;
4563         } elsif (!ref($content) && defined($content)) {
4564                 print $content;
4565         }
4566
4567         print $cgi->end_div;
4568 }
4569
4570 sub format_timestamp_html {
4571         my $date = shift;
4572         my $strtime = $date->{'rfc2822'};
4573
4574         my (undef, undef, $datetime_class) =
4575                 gitweb_get_feature('javascript-timezone');
4576         if ($datetime_class) {
4577                 $strtime = qq!<span class="$datetime_class">$strtime</span>!;
4578         }
4579
4580         my $localtime_format = '(%02d:%02d %s)';
4581         if ($date->{'hour_local'} < 6) {
4582                 $localtime_format = '(<span class="atnight">%02d:%02d</span> %s)';
4583         }
4584         $strtime .= ' ' .
4585                     sprintf($localtime_format,
4586                             $date->{'hour_local'}, $date->{'minute_local'}, $date->{'tz_local'});
4587
4588         return $strtime;
4589 }
4590
4591 # Outputs the author name and date in long form
4592 sub git_print_authorship {
4593         my $co = shift;
4594         my %opts = @_;
4595         my $tag = $opts{-tag} || 'div';
4596         my $author = $co->{'author_name'};
4597
4598         my %ad = parse_date($co->{'author_epoch'}, $co->{'author_tz'});
4599         print "<$tag class=\"author_date\">" .
4600               format_search_author($author, "author", esc_html($author)) .
4601               " [".format_timestamp_html(\%ad)."]".
4602               git_get_avatar($co->{'author_email'}, -pad_before => 1) .
4603               "</$tag>\n";
4604 }
4605
4606 # Outputs table rows containing the full author or committer information,
4607 # in the format expected for 'commit' view (& similar).
4608 # Parameters are a commit hash reference, followed by the list of people
4609 # to output information for. If the list is empty it defaults to both
4610 # author and committer.
4611 sub git_print_authorship_rows {
4612         my $co = shift;
4613         # too bad we can't use @people = @_ || ('author', 'committer')
4614         my @people = @_;
4615         @people = ('author', 'committer') unless @people;
4616         foreach my $who (@people) {
4617                 my %wd = parse_date($co->{"${who}_epoch"}, $co->{"${who}_tz"});
4618                 print "<tr><td>$who</td><td>" .
4619                       format_search_author($co->{"${who}_name"}, $who,
4620                                            esc_html($co->{"${who}_name"})) . " " .
4621                       format_search_author($co->{"${who}_email"}, $who,
4622                                            esc_html("<" . $co->{"${who}_email"} . ">")) .
4623                       "</td><td rowspan=\"2\">" .
4624                       git_get_avatar($co->{"${who}_email"}, -size => 'double') .
4625                       "</td></tr>\n" .
4626                       "<tr>" .
4627                       "<td></td><td>" .
4628                       format_timestamp_html(\%wd) .
4629                       "</td>" .
4630                       "</tr>\n";
4631         }
4632 }
4633
4634 sub git_print_page_path {
4635         my $name = shift;
4636         my $type = shift;
4637         my $hb = shift;
4638
4639
4640         print "<div class=\"page_path\">";
4641         print $cgi->a({-href => href(action=>"tree", hash_base=>$hb),
4642                       -title => 'tree root'}, to_utf8("[$project]"));
4643         print " / ";
4644         if (defined $name) {
4645                 my @dirname = split '/', $name;
4646                 my $basename = pop @dirname;
4647                 my $fullname = '';
4648
4649                 foreach my $dir (@dirname) {
4650                         $fullname .= ($fullname ? '/' : '') . $dir;
4651                         print $cgi->a({-href => href(action=>"tree", file_name=>$fullname,
4652                                                      hash_base=>$hb),
4653                                       -title => $fullname}, esc_path($dir));
4654                         print " / ";
4655                 }
4656                 if (defined $type && $type eq 'blob') {
4657                         print $cgi->a({-href => href(action=>"blob_plain", file_name=>$file_name,
4658                                                      hash_base=>$hb),
4659                                       -title => $name}, esc_path($basename));
4660                 } elsif (defined $type && $type eq 'tree') {
4661                         print $cgi->a({-href => href(action=>"tree", file_name=>$file_name,
4662                                                      hash_base=>$hb),
4663                                       -title => $name}, esc_path($basename));
4664                         print " / ";
4665                 } else {
4666                         print esc_path($basename);
4667                 }
4668         }
4669         print "<br/></div>\n";
4670 }
4671
4672 sub git_print_log {
4673         my $log = shift;
4674         my %opts = @_;
4675
4676         if ($opts{'-remove_title'}) {
4677                 # remove title, i.e. first line of log
4678                 shift @$log;
4679         }
4680         # remove leading empty lines
4681         while (defined $log->[0] && $log->[0] eq "") {
4682                 shift @$log;
4683         }
4684
4685         # print log
4686         my $skip_blank_line = 0;
4687         foreach my $line (@$log) {
4688                 if ($line =~ m/^\s*([A-Z][-A-Za-z]*-[Bb]y|C[Cc]): /) {
4689                         if (! $opts{'-remove_signoff'}) {
4690                                 print "<span class=\"signoff\">" . esc_html($line) . "</span><br/>\n";
4691                                 $skip_blank_line = 1;
4692                         }
4693                         next;
4694                 }
4695
4696                 if ($line =~ m,\s*([a-z]*link): (https?://\S+),i) {
4697                         if (! $opts{'-remove_signoff'}) {
4698                                 print "<span class=\"signoff\">" . esc_html($1) . ": " .
4699                                         "<a href=\"" . esc_html($2) . "\">" . esc_html($2) . "</a>" .
4700                                         "</span><br/>\n";
4701                                 $skip_blank_line = 1;
4702                         }
4703                         next;
4704                 }
4705
4706                 # print only one empty line
4707                 # do not print empty line after signoff
4708                 if ($line eq "") {
4709                         next if ($skip_blank_line);
4710                         $skip_blank_line = 1;
4711                 } else {
4712                         $skip_blank_line = 0;
4713                 }
4714
4715                 print format_log_line_html($line) . "<br/>\n";
4716         }
4717
4718         if ($opts{'-final_empty_line'}) {
4719                 # end with single empty line
4720                 print "<br/>\n" unless $skip_blank_line;
4721         }
4722 }
4723
4724 # return link target (what link points to)
4725 sub git_get_link_target {
4726         my $hash = shift;
4727         my $link_target;
4728
4729         # read link
4730         open my $fd, "-|", git_cmd(), "cat-file", "blob", $hash
4731                 or return;
4732         {
4733                 local $/ = undef;
4734                 $link_target = <$fd>;
4735         }
4736         close $fd
4737                 or return;
4738
4739         return $link_target;
4740 }
4741
4742 # given link target, and the directory (basedir) the link is in,
4743 # return target of link relative to top directory (top tree);
4744 # return undef if it is not possible (including absolute links).
4745 sub normalize_link_target {
4746         my ($link_target, $basedir) = @_;
4747
4748         # absolute symlinks (beginning with '/') cannot be normalized
4749         return if (substr($link_target, 0, 1) eq '/');
4750
4751         # normalize link target to path from top (root) tree (dir)
4752         my $path;
4753         if ($basedir) {
4754                 $path = $basedir . '/' . $link_target;
4755         } else {
4756                 # we are in top (root) tree (dir)
4757                 $path = $link_target;
4758         }
4759
4760         # remove //, /./, and /../
4761         my @path_parts;
4762         foreach my $part (split('/', $path)) {
4763                 # discard '.' and ''
4764                 next if (!$part || $part eq '.');
4765                 # handle '..'
4766                 if ($part eq '..') {
4767                         if (@path_parts) {
4768                                 pop @path_parts;
4769                         } else {
4770                                 # link leads outside repository (outside top dir)
4771                                 return;
4772                         }
4773                 } else {
4774                         push @path_parts, $part;
4775                 }
4776         }
4777         $path = join('/', @path_parts);
4778
4779         return $path;
4780 }
4781
4782 # print tree entry (row of git_tree), but without encompassing <tr> element
4783 sub git_print_tree_entry {
4784         my ($t, $basedir, $hash_base, $have_blame) = @_;
4785
4786         my %base_key = ();
4787         $base_key{'hash_base'} = $hash_base if defined $hash_base;
4788
4789         # The format of a table row is: mode list link.  Where mode is
4790         # the mode of the entry, list is the name of the entry, an href,
4791         # and link is the action links of the entry.
4792
4793         print "<td class=\"mode\">" . mode_str($t->{'mode'}) . "</td>\n";
4794         if (exists $t->{'size'}) {
4795                 print "<td class=\"size\">$t->{'size'}</td>\n";
4796         }
4797         if ($t->{'type'} eq "blob") {
4798                 print "<td class=\"list\">" .
4799                         $cgi->a({-href => href(action=>"blob", hash=>$t->{'hash'},
4800                                                file_name=>"$basedir$t->{'name'}", %base_key),
4801                                 -class => "list"}, esc_path($t->{'name'}));
4802                 if (S_ISLNK(oct $t->{'mode'})) {
4803                         my $link_target = git_get_link_target($t->{'hash'});
4804                         if ($link_target) {
4805                                 my $norm_target = normalize_link_target($link_target, $basedir);
4806                                 if (defined $norm_target) {
4807                                         print " -> " .
4808                                               $cgi->a({-href => href(action=>"object", hash_base=>$hash_base,
4809                                                                      file_name=>$norm_target),
4810                                                        -title => $norm_target}, esc_path($link_target));
4811                                 } else {
4812                                         print " -> " . esc_path($link_target);
4813                                 }
4814                         }
4815                 }
4816                 print "</td>\n";
4817                 print "<td class=\"link\">";
4818                 print $cgi->a({-href => href(action=>"blob", hash=>$t->{'hash'},
4819                                              file_name=>"$basedir$t->{'name'}", %base_key)},
4820                               "blob");
4821                 if ($have_blame) {
4822                         print " | " .
4823                               $cgi->a({-href => href(action=>"blame", hash=>$t->{'hash'},
4824                                                      file_name=>"$basedir$t->{'name'}", %base_key)},
4825                                       "blame");
4826                 }
4827                 if (defined $hash_base) {
4828                         print " | " .
4829                               $cgi->a({-href => href(action=>"history", hash_base=>$hash_base,
4830                                                      hash=>$t->{'hash'}, file_name=>"$basedir$t->{'name'}")},
4831                                       "history");
4832                 }
4833                 print " | " .
4834                         $cgi->a({-href => href(action=>"blob_plain", hash_base=>$hash_base,
4835                                                file_name=>"$basedir$t->{'name'}")},
4836                                 "raw");
4837                 print "</td>\n";
4838
4839         } elsif ($t->{'type'} eq "tree") {
4840                 print "<td class=\"list\">";
4841                 print $cgi->a({-href => href(action=>"tree", hash=>$t->{'hash'},
4842                                              file_name=>"$basedir$t->{'name'}",
4843                                              %base_key)},
4844                               esc_path($t->{'name'}));
4845                 print "</td>\n";
4846                 print "<td class=\"link\">";
4847                 print $cgi->a({-href => href(action=>"tree", hash=>$t->{'hash'},
4848                                              file_name=>"$basedir$t->{'name'}",
4849                                              %base_key)},
4850                               "tree");
4851                 if (defined $hash_base) {
4852                         print " | " .
4853                               $cgi->a({-href => href(action=>"history", hash_base=>$hash_base,
4854                                                      file_name=>"$basedir$t->{'name'}")},
4855                                       "history");
4856                 }
4857                 print "</td>\n";
4858         } else {
4859                 # unknown object: we can only present history for it
4860                 # (this includes 'commit' object, i.e. submodule support)
4861                 print "<td class=\"list\">" .
4862                       esc_path($t->{'name'}) .
4863                       "</td>\n";
4864                 print "<td class=\"link\">";
4865                 if (defined $hash_base) {
4866                         print $cgi->a({-href => href(action=>"history",
4867                                                      hash_base=>$hash_base,
4868                                                      file_name=>"$basedir$t->{'name'}")},
4869                                       "history");
4870                 }
4871                 print "</td>\n";
4872         }
4873 }
4874
4875 ## ......................................................................
4876 ## functions printing large fragments of HTML
4877
4878 # get pre-image filenames for merge (combined) diff
4879 sub fill_from_file_info {
4880         my ($diff, @parents) = @_;
4881
4882         $diff->{'from_file'} = [ ];
4883         $diff->{'from_file'}[$diff->{'nparents'} - 1] = undef;
4884         for (my $i = 0; $i < $diff->{'nparents'}; $i++) {
4885                 if ($diff->{'status'}[$i] eq 'R' ||
4886                     $diff->{'status'}[$i] eq 'C') {
4887                         $diff->{'from_file'}[$i] =
4888                                 git_get_path_by_hash($parents[$i], $diff->{'from_id'}[$i]);
4889                 }
4890         }
4891
4892         return $diff;
4893 }
4894
4895 # is current raw difftree line of file deletion
4896 sub is_deleted {
4897         my $diffinfo = shift;
4898
4899         return $diffinfo->{'to_id'} eq ('0' x 40);
4900 }
4901
4902 # does patch correspond to [previous] difftree raw line
4903 # $diffinfo  - hashref of parsed raw diff format
4904 # $patchinfo - hashref of parsed patch diff format
4905 #              (the same keys as in $diffinfo)
4906 sub is_patch_split {
4907         my ($diffinfo, $patchinfo) = @_;
4908
4909         return defined $diffinfo && defined $patchinfo
4910                 && $diffinfo->{'to_file'} eq $patchinfo->{'to_file'};
4911 }
4912
4913
4914 sub git_difftree_body {
4915         my ($difftree, $hash, @parents) = @_;
4916         my ($parent) = $parents[0];
4917         my $have_blame = gitweb_check_feature('blame');
4918         print "<div class=\"list_head\">\n";
4919         if ($#{$difftree} > 10) {
4920                 print(($#{$difftree} + 1) . " files changed:\n");
4921         }
4922         print "</div>\n";
4923
4924         print "<table class=\"" .
4925               (@parents > 1 ? "combined " : "") .
4926               "diff_tree\">\n";
4927
4928         # header only for combined diff in 'commitdiff' view
4929         my $has_header = @$difftree && @parents > 1 && $action eq 'commitdiff';
4930         if ($has_header) {
4931                 # table header
4932                 print "<thead><tr>\n" .
4933                        "<th></th><th></th>\n"; # filename, patchN link
4934                 for (my $i = 0; $i < @parents; $i++) {
4935                         my $par = $parents[$i];
4936                         print "<th>" .
4937                               $cgi->a({-href => href(action=>"commitdiff",
4938                                                      hash=>$hash, hash_parent=>$par),
4939                                        -title => 'commitdiff to parent number ' .
4940                                                   ($i+1) . ': ' . substr($par,0,7)},
4941                                       $i+1) .
4942                               "&nbsp;</th>\n";
4943                 }
4944                 print "</tr></thead>\n<tbody>\n";
4945         }
4946
4947         my $alternate = 1;
4948         my $patchno = 0;
4949         foreach my $line (@{$difftree}) {
4950                 my $diff = parsed_difftree_line($line);
4951
4952                 if ($alternate) {
4953                         print "<tr class=\"dark\">\n";
4954                 } else {
4955                         print "<tr class=\"light\">\n";
4956                 }
4957                 $alternate ^= 1;
4958
4959                 if (exists $diff->{'nparents'}) { # combined diff
4960
4961                         fill_from_file_info($diff, @parents)
4962                                 unless exists $diff->{'from_file'};
4963
4964                         if (!is_deleted($diff)) {
4965                                 # file exists in the result (child) commit
4966                                 print "<td>" .
4967                                       $cgi->a({-href => href(action=>"blob", hash=>$diff->{'to_id'},
4968                                                              file_name=>$diff->{'to_file'},
4969                                                              hash_base=>$hash),
4970                                               -class => "list"}, esc_path($diff->{'to_file'})) .
4971                                       "</td>\n";
4972                         } else {
4973                                 print "<td>" .
4974                                       esc_path($diff->{'to_file'}) .
4975                                       "</td>\n";
4976                         }
4977
4978                         if ($action eq 'commitdiff') {
4979                                 # link to patch
4980                                 $patchno++;
4981                                 print "<td class=\"link\">" .
4982                                       $cgi->a({-href => href(-anchor=>"patch$patchno")},
4983                                               "patch") .
4984                                       " | " .
4985                                       "</td>\n";
4986                         }
4987
4988                         my $has_history = 0;
4989                         my $not_deleted = 0;
4990                         for (my $i = 0; $i < $diff->{'nparents'}; $i++) {
4991                                 my $hash_parent = $parents[$i];
4992                                 my $from_hash = $diff->{'from_id'}[$i];
4993                                 my $from_path = $diff->{'from_file'}[$i];
4994                                 my $status = $diff->{'status'}[$i];
4995
4996                                 $has_history ||= ($status ne 'A');
4997                                 $not_deleted ||= ($status ne 'D');
4998
4999                                 if ($status eq 'A') {
5000                                         print "<td  class=\"link\" align=\"right\"> | </td>\n";
5001                                 } elsif ($status eq 'D') {
5002                                         print "<td class=\"link\">" .
5003                                               $cgi->a({-href => href(action=>"blob",
5004                                                                      hash_base=>$hash,
5005                                                                      hash=>$from_hash,
5006                                                                      file_name=>$from_path)},
5007                                                       "blob" . ($i+1)) .
5008                                               " | </td>\n";
5009                                 } else {
5010                                         if ($diff->{'to_id'} eq $from_hash) {
5011                                                 print "<td class=\"link nochange\">";
5012                                         } else {
5013                                                 print "<td class=\"link\">";
5014                                         }
5015                                         print $cgi->a({-href => href(action=>"blobdiff",
5016                                                                      hash=>$diff->{'to_id'},
5017                                                                      hash_parent=>$from_hash,
5018                                                                      hash_base=>$hash,
5019                                                                      hash_parent_base=>$hash_parent,
5020                                                                      file_name=>$diff->{'to_file'},
5021                                                                      file_parent=>$from_path)},
5022                                                       "diff" . ($i+1)) .
5023                                               " | </td>\n";
5024                                 }
5025                         }
5026
5027                         print "<td class=\"link\">";
5028                         if ($not_deleted) {
5029                                 print $cgi->a({-href => href(action=>"blob",
5030                                                              hash=>$diff->{'to_id'},
5031                                                              file_name=>$diff->{'to_file'},
5032                                                              hash_base=>$hash)},
5033                                               "blob");
5034                                 print " | " if ($has_history);
5035                         }
5036                         if ($has_history) {
5037                                 print $cgi->a({-href => href(action=>"history",
5038                                                              file_name=>$diff->{'to_file'},
5039                                                              hash_base=>$hash)},
5040                                               "history");
5041                         }
5042                         print "</td>\n";
5043
5044                         print "</tr>\n";
5045                         next; # instead of 'else' clause, to avoid extra indent
5046                 }
5047                 # else ordinary diff
5048
5049                 my ($to_mode_oct, $to_mode_str, $to_file_type);
5050                 my ($from_mode_oct, $from_mode_str, $from_file_type);
5051                 if ($diff->{'to_mode'} ne ('0' x 6)) {
5052                         $to_mode_oct = oct $diff->{'to_mode'};
5053                         if (S_ISREG($to_mode_oct)) { # only for regular file
5054                                 $to_mode_str = sprintf("%04o", $to_mode_oct & 0777); # permission bits
5055                         }
5056                         $to_file_type = file_type($diff->{'to_mode'});
5057                 }
5058                 if ($diff->{'from_mode'} ne ('0' x 6)) {
5059                         $from_mode_oct = oct $diff->{'from_mode'};
5060                         if (S_ISREG($from_mode_oct)) { # only for regular file
5061                                 $from_mode_str = sprintf("%04o", $from_mode_oct & 0777); # permission bits
5062                         }
5063                         $from_file_type = file_type($diff->{'from_mode'});
5064                 }
5065
5066                 if ($diff->{'status'} eq "A") { # created
5067                         my $mode_chng = "<span class=\"file_status new\">[new $to_file_type";
5068                         $mode_chng   .= " with mode: $to_mode_str" if $to_mode_str;
5069                         $mode_chng   .= "]</span>";
5070                         print "<td>";
5071                         print $cgi->a({-href => href(action=>"blob", hash=>$diff->{'to_id'},
5072                                                      hash_base=>$hash, file_name=>$diff->{'file'}),
5073                                       -class => "list"}, esc_path($diff->{'file'}));
5074                         print "</td>\n";
5075                         print "<td>$mode_chng</td>\n";
5076                         print "<td class=\"link\">";
5077                         if ($action eq 'commitdiff') {
5078                                 # link to patch
5079                                 $patchno++;
5080                                 print $cgi->a({-href => href(-anchor=>"patch$patchno")},
5081                                               "patch") .
5082                                       " | ";
5083                         }
5084                         print $cgi->a({-href => href(action=>"blob", hash=>$diff->{'to_id'},
5085                                                      hash_base=>$hash, file_name=>$diff->{'file'})},
5086                                       "blob");
5087                         print "</td>\n";
5088
5089                 } elsif ($diff->{'status'} eq "D") { # deleted
5090                         my $mode_chng = "<span class=\"file_status deleted\">[deleted $from_file_type]</span>";
5091                         print "<td>";
5092                         print $cgi->a({-href => href(action=>"blob", hash=>$diff->{'from_id'},
5093                                                      hash_base=>$parent, file_name=>$diff->{'file'}),
5094                                        -class => "list"}, esc_path($diff->{'file'}));
5095                         print "</td>\n";
5096                         print "<td>$mode_chng</td>\n";
5097                         print "<td class=\"link\">";
5098                         if ($action eq 'commitdiff') {
5099                                 # link to patch
5100                                 $patchno++;
5101                                 print $cgi->a({-href => href(-anchor=>"patch$patchno")},
5102                                               "patch") .
5103                                       " | ";
5104                         }
5105                         print $cgi->a({-href => href(action=>"blob", hash=>$diff->{'from_id'},
5106                                                      hash_base=>$parent, file_name=>$diff->{'file'})},
5107                                       "blob") . " | ";
5108                         if ($have_blame) {
5109                                 print $cgi->a({-href => href(action=>"blame", hash_base=>$parent,
5110                                                              file_name=>$diff->{'file'})},
5111                                               "blame") . " | ";
5112                         }
5113                         print $cgi->a({-href => href(action=>"history", hash_base=>$parent,
5114                                                      file_name=>$diff->{'file'})},
5115                                       "history");
5116                         print "</td>\n";
5117
5118                 } elsif ($diff->{'status'} eq "M" || $diff->{'status'} eq "T") { # modified, or type changed
5119                         my $mode_chnge = "";
5120                         if ($diff->{'from_mode'} != $diff->{'to_mode'}) {
5121                                 $mode_chnge = "<span class=\"file_status mode_chnge\">[changed";
5122                                 if ($from_file_type ne $to_file_type) {
5123                                         $mode_chnge .= " from $from_file_type to $to_file_type";
5124                                 }
5125                                 if (($from_mode_oct & 0777) != ($to_mode_oct & 0777)) {
5126                                         if ($from_mode_str && $to_mode_str) {
5127                                                 $mode_chnge .= " mode: $from_mode_str->$to_mode_str";
5128                                         } elsif ($to_mode_str) {
5129                                                 $mode_chnge .= " mode: $to_mode_str";
5130                                         }
5131                                 }
5132                                 $mode_chnge .= "]</span>\n";
5133                         }
5134                         print "<td>";
5135                         print $cgi->a({-href => href(action=>"blob", hash=>$diff->{'to_id'},
5136                                                      hash_base=>$hash, file_name=>$diff->{'file'}),
5137                                       -class => "list"}, esc_path($diff->{'file'}));
5138                         print "</td>\n";
5139                         print "<td>$mode_chnge</td>\n";
5140                         print "<td class=\"link\">";
5141                         if ($action eq 'commitdiff') {
5142                                 # link to patch
5143                                 $patchno++;
5144                                 print $cgi->a({-href => href(-anchor=>"patch$patchno")},
5145                                               "patch") .
5146                                       " | ";
5147                         } elsif ($diff->{'to_id'} ne $diff->{'from_id'}) {
5148                                 # "commit" view and modified file (not onlu mode changed)
5149                                 print $cgi->a({-href => href(action=>"blobdiff",
5150                                                              hash=>$diff->{'to_id'}, hash_parent=>$diff->{'from_id'},
5151                                                              hash_base=>$hash, hash_parent_base=>$parent,
5152                                                              file_name=>$diff->{'file'})},
5153                                               "diff") .
5154                                       " | ";
5155                         }
5156                         print $cgi->a({-href => href(action=>"blob", hash=>$diff->{'to_id'},
5157                                                      hash_base=>$hash, file_name=>$diff->{'file'})},
5158                                        "blob") . " | ";
5159                         if ($have_blame) {
5160                                 print $cgi->a({-href => href(action=>"blame", hash_base=>$hash,
5161                                                              file_name=>$diff->{'file'})},
5162                                               "blame") . " | ";
5163                         }
5164                         print $cgi->a({-href => href(action=>"history", hash_base=>$hash,
5165                                                      file_name=>$diff->{'file'})},
5166                                       "history");
5167                         print "</td>\n";
5168
5169                 } elsif ($diff->{'status'} eq "R" || $diff->{'status'} eq "C") { # renamed or copied
5170                         my %status_name = ('R' => 'moved', 'C' => 'copied');
5171                         my $nstatus = $status_name{$diff->{'status'}};
5172                         my $mode_chng = "";
5173                         if ($diff->{'from_mode'} != $diff->{'to_mode'}) {
5174                                 # mode also for directories, so we cannot use $to_mode_str
5175                                 $mode_chng = sprintf(", mode: %04o", $to_mode_oct & 0777);
5176                         }
5177                         print "<td>" .
5178                               $cgi->a({-href => href(action=>"blob", hash_base=>$hash,
5179                                                      hash=>$diff->{'to_id'}, file_name=>$diff->{'to_file'}),
5180                                       -class => "list"}, esc_path($diff->{'to_file'})) . "</td>\n" .
5181                               "<td><span class=\"file_status $nstatus\">[$nstatus from " .
5182                               $cgi->a({-href => href(action=>"blob", hash_base=>$parent,
5183                                                      hash=>$diff->{'from_id'}, file_name=>$diff->{'from_file'}),
5184                                       -class => "list"}, esc_path($diff->{'from_file'})) .
5185                               " with " . (int $diff->{'similarity'}) . "% similarity$mode_chng]</span></td>\n" .
5186                               "<td class=\"link\">";
5187                         if ($action eq 'commitdiff') {
5188                                 # link to patch
5189                                 $patchno++;
5190                                 print $cgi->a({-href => href(-anchor=>"patch$patchno")},
5191                                               "patch") .
5192                                       " | ";
5193                         } elsif ($diff->{'to_id'} ne $diff->{'from_id'}) {
5194                                 # "commit" view and modified file (not only pure rename or copy)
5195                                 print $cgi->a({-href => href(action=>"blobdiff",
5196                                                              hash=>$diff->{'to_id'}, hash_parent=>$diff->{'from_id'},
5197                                                              hash_base=>$hash, hash_parent_base=>$parent,
5198                                                              file_name=>$diff->{'to_file'}, file_parent=>$diff->{'from_file'})},
5199                                               "diff") .
5200                                       " | ";
5201                         }
5202                         print $cgi->a({-href => href(action=>"blob", hash=>$diff->{'to_id'},
5203                                                      hash_base=>$parent, file_name=>$diff->{'to_file'})},
5204                                       "blob") . " | ";
5205                         if ($have_blame) {
5206                                 print $cgi->a({-href => href(action=>"blame", hash_base=>$hash,
5207                                                              file_name=>$diff->{'to_file'})},
5208                                               "blame") . " | ";
5209                         }
5210                         print $cgi->a({-href => href(action=>"history", hash_base=>$hash,
5211                                                     file_name=>$diff->{'to_file'})},
5212                                       "history");
5213                         print "</td>\n";
5214
5215                 } # we should not encounter Unmerged (U) or Unknown (X) status
5216                 print "</tr>\n";
5217         }
5218         print "</tbody>" if $has_header;
5219         print "</table>\n";
5220 }
5221
5222 # Print context lines and then rem/add lines in a side-by-side manner.
5223 sub print_sidebyside_diff_lines {
5224         my ($ctx, $rem, $add) = @_;
5225
5226         # print context block before add/rem block
5227         if (@$ctx) {
5228                 print join '',
5229                         '<div class="chunk_block ctx">',
5230                                 '<div class="old">',
5231                                 @$ctx,
5232                                 '</div>',
5233                                 '<div class="new">',
5234                                 @$ctx,
5235                                 '</div>',
5236                         '</div>';
5237         }
5238
5239         if (!@$add) {
5240                 # pure removal
5241                 print join '',
5242                         '<div class="chunk_block rem">',
5243                                 '<div class="old">',
5244                                 @$rem,
5245                                 '</div>',
5246                         '</div>';
5247         } elsif (!@$rem) {
5248                 # pure addition
5249                 print join '',
5250                         '<div class="chunk_block add">',
5251                                 '<div class="new">',
5252                                 @$add,
5253                                 '</div>',
5254                         '</div>';
5255         } else {
5256                 print join '',
5257                         '<div class="chunk_block chg">',
5258                                 '<div class="old">',
5259                                 @$rem,
5260                                 '</div>',
5261                                 '<div class="new">',
5262                                 @$add,
5263                                 '</div>',
5264                         '</div>';
5265         }
5266 }
5267
5268 # Print context lines and then rem/add lines in inline manner.
5269 sub print_inline_diff_lines {
5270         my ($ctx, $rem, $add) = @_;
5271
5272         print @$ctx, @$rem, @$add;
5273 }
5274
5275 # Format removed and added line, mark changed part and HTML-format them.
5276 # Implementation is based on contrib/diff-highlight
5277 sub format_rem_add_lines_pair {
5278         my ($rem, $add, $num_parents) = @_;
5279
5280         # We need to untabify lines before split()'ing them;
5281         # otherwise offsets would be invalid.
5282         chomp $rem;
5283         chomp $add;
5284         $rem = untabify($rem);
5285         $add = untabify($add);
5286
5287         my @rem = split(//, $rem);
5288         my @add = split(//, $add);
5289         my ($esc_rem, $esc_add);
5290         # Ignore leading +/- characters for each parent.
5291         my ($prefix_len, $suffix_len) = ($num_parents, 0);
5292         my ($prefix_has_nonspace, $suffix_has_nonspace);
5293
5294         my $shorter = (@rem < @add) ? @rem : @add;
5295         while ($prefix_len < $shorter) {
5296                 last if ($rem[$prefix_len] ne $add[$prefix_len]);
5297
5298                 $prefix_has_nonspace = 1 if ($rem[$prefix_len] !~ /\s/);
5299                 $prefix_len++;
5300         }
5301
5302         while ($prefix_len + $suffix_len < $shorter) {
5303                 last if ($rem[-1 - $suffix_len] ne $add[-1 - $suffix_len]);
5304
5305                 $suffix_has_nonspace = 1 if ($rem[-1 - $suffix_len] !~ /\s/);
5306                 $suffix_len++;
5307         }
5308
5309         # Mark lines that are different from each other, but have some common
5310         # part that isn't whitespace.  If lines are completely different, don't
5311         # mark them because that would make output unreadable, especially if
5312         # diff consists of multiple lines.
5313         if ($prefix_has_nonspace || $suffix_has_nonspace) {
5314                 $esc_rem = esc_html_hl_regions($rem, 'marked',
5315                         [$prefix_len, @rem - $suffix_len], -nbsp=>1);
5316                 $esc_add = esc_html_hl_regions($add, 'marked',
5317                         [$prefix_len, @add - $suffix_len], -nbsp=>1);
5318         } else {
5319                 $esc_rem = esc_html($rem, -nbsp=>1);
5320                 $esc_add = esc_html($add, -nbsp=>1);
5321         }
5322
5323         return format_diff_line(\$esc_rem, 'rem'),
5324                format_diff_line(\$esc_add, 'add');
5325 }
5326
5327 # HTML-format diff context, removed and added lines.
5328 sub format_ctx_rem_add_lines {
5329         my ($ctx, $rem, $add, $num_parents) = @_;
5330         my (@new_ctx, @new_rem, @new_add);
5331         my $can_highlight = 0;
5332         my $is_combined = ($num_parents > 1);
5333
5334         # Highlight if every removed line has a corresponding added line.
5335         if (@$add > 0 && @$add == @$rem) {
5336                 $can_highlight = 1;
5337
5338                 # Highlight lines in combined diff only if the chunk contains
5339                 # diff between the same version, e.g.
5340                 #
5341                 #    - a
5342                 #   -  b
5343                 #    + c
5344                 #   +  d
5345                 #
5346                 # Otherwise the highlightling would be confusing.
5347                 if ($is_combined) {
5348                         for (my $i = 0; $i < @$add; $i++) {
5349                                 my $prefix_rem = substr($rem->[$i], 0, $num_parents);
5350                                 my $prefix_add = substr($add->[$i], 0, $num_parents);
5351
5352                                 $prefix_rem =~ s/-/+/g;
5353
5354                                 if ($prefix_rem ne $prefix_add) {
5355                                         $can_highlight = 0;
5356                                         last;
5357                                 }
5358                         }
5359                 }
5360         }
5361
5362         if ($can_highlight) {
5363                 for (my $i = 0; $i < @$add; $i++) {
5364                         my ($line_rem, $line_add) = format_rem_add_lines_pair(
5365                                 $rem->[$i], $add->[$i], $num_parents);
5366                         push @new_rem, $line_rem;
5367                         push @new_add, $line_add;
5368                 }
5369         } else {
5370                 @new_rem = map { format_diff_line($_, 'rem') } @$rem;
5371                 @new_add = map { format_diff_line($_, 'add') } @$add;
5372         }
5373
5374         @new_ctx = map { format_diff_line($_, 'ctx') } @$ctx;
5375
5376         return (\@new_ctx, \@new_rem, \@new_add);
5377 }
5378
5379 # Print context lines and then rem/add lines.
5380 sub print_diff_lines {
5381         my ($ctx, $rem, $add, $diff_style, $num_parents) = @_;
5382         my $is_combined = $num_parents > 1;
5383
5384         ($ctx, $rem, $add) = format_ctx_rem_add_lines($ctx, $rem, $add,
5385                 $num_parents);
5386
5387         if ($diff_style eq 'sidebyside' && !$is_combined) {
5388                 print_sidebyside_diff_lines($ctx, $rem, $add);
5389         } else {
5390                 # default 'inline' style and unknown styles
5391                 print_inline_diff_lines($ctx, $rem, $add);
5392         }
5393 }
5394
5395 sub print_diff_chunk {
5396         my ($diff_style, $num_parents, $from, $to, @chunk) = @_;
5397         my (@ctx, @rem, @add);
5398
5399         # The class of the previous line.
5400         my $prev_class = '';
5401
5402         return unless @chunk;
5403
5404         # incomplete last line might be among removed or added lines,
5405         # or both, or among context lines: find which
5406         for (my $i = 1; $i < @chunk; $i++) {
5407                 if ($chunk[$i][0] eq 'incomplete') {
5408                         $chunk[$i][0] = $chunk[$i-1][0];
5409                 }
5410         }
5411
5412         # guardian
5413         push @chunk, ["", ""];
5414
5415         foreach my $line_info (@chunk) {
5416                 my ($class, $line) = @$line_info;
5417
5418                 # print chunk headers
5419                 if ($class && $class eq 'chunk_header') {
5420                         print format_diff_line($line, $class, $from, $to);
5421                         next;
5422                 }
5423
5424                 ## print from accumulator when have some add/rem lines or end
5425                 # of chunk (flush context lines), or when have add and rem
5426                 # lines and new block is reached (otherwise add/rem lines could
5427                 # be reordered)
5428                 if (!$class || ((@rem || @add) && $class eq 'ctx') ||
5429                     (@rem && @add && $class ne $prev_class)) {
5430                         print_diff_lines(\@ctx, \@rem, \@add,
5431                                          $diff_style, $num_parents);
5432                         @ctx = @rem = @add = ();
5433                 }
5434
5435                 ## adding lines to accumulator
5436                 # guardian value
5437                 last unless $line;
5438                 # rem, add or change
5439                 if ($class eq 'rem') {
5440                         push @rem, $line;
5441                 } elsif ($class eq 'add') {
5442                         push @add, $line;
5443                 }
5444                 # context line
5445                 if ($class eq 'ctx') {
5446                         push @ctx, $line;
5447                 }
5448
5449                 $prev_class = $class;
5450         }
5451 }
5452
5453 sub git_patchset_body {
5454         my ($fd, $diff_style, $difftree, $hash, @hash_parents) = @_;
5455         my ($hash_parent) = $hash_parents[0];
5456
5457         my $is_combined = (@hash_parents > 1);
5458         my $patch_idx = 0;
5459         my $patch_number = 0;
5460         my $patch_line;
5461         my $diffinfo;
5462         my $to_name;
5463         my (%from, %to);
5464         my @chunk; # for side-by-side diff
5465
5466         print "<div class=\"patchset\">\n";
5467
5468         # skip to first patch
5469         while ($patch_line = <$fd>) {
5470                 chomp $patch_line;
5471
5472                 last if ($patch_line =~ m/^diff /);
5473         }
5474
5475  PATCH:
5476         while ($patch_line) {
5477
5478                 # parse "git diff" header line
5479                 if ($patch_line =~ m/^diff --git (\"(?:[^\\\"]*(?:\\.[^\\\"]*)*)\"|[^ "]*) (.*)$/) {
5480                         # $1 is from_name, which we do not use
5481                         $to_name = unquote($2);
5482                         $to_name =~ s!^b/!!;
5483                 } elsif ($patch_line =~ m/^diff --(cc|combined) ("?.*"?)$/) {
5484                         # $1 is 'cc' or 'combined', which we do not use
5485                         $to_name = unquote($2);
5486                 } else {
5487                         $to_name = undef;
5488                 }
5489
5490                 # check if current patch belong to current raw line
5491                 # and parse raw git-diff line if needed
5492                 if (is_patch_split($diffinfo, { 'to_file' => $to_name })) {
5493                         # this is continuation of a split patch
5494                         print "<div class=\"patch cont\">\n";
5495                 } else {
5496                         # advance raw git-diff output if needed
5497                         $patch_idx++ if defined $diffinfo;
5498
5499                         # read and prepare patch information
5500                         $diffinfo = parsed_difftree_line($difftree->[$patch_idx]);
5501
5502                         # compact combined diff output can have some patches skipped
5503                         # find which patch (using pathname of result) we are at now;
5504                         if ($is_combined) {
5505                                 while ($to_name ne $diffinfo->{'to_file'}) {
5506                                         print "<div class=\"patch\" id=\"patch". ($patch_idx+1) ."\">\n" .
5507                                               format_diff_cc_simplified($diffinfo, @hash_parents) .
5508                                               "</div>\n";  # class="patch"
5509
5510                                         $patch_idx++;
5511                                         $patch_number++;
5512
5513                                         last if $patch_idx > $#$difftree;
5514                                         $diffinfo = parsed_difftree_line($difftree->[$patch_idx]);
5515                                 }
5516                         }
5517
5518                         # modifies %from, %to hashes
5519                         parse_from_to_diffinfo($diffinfo, \%from, \%to, @hash_parents);
5520
5521                         # this is first patch for raw difftree line with $patch_idx index
5522                         # we index @$difftree array from 0, but number patches from 1
5523                         print "<div class=\"patch\" id=\"patch". ($patch_idx+1) ."\">\n";
5524                 }
5525
5526                 # git diff header
5527                 #assert($patch_line =~ m/^diff /) if DEBUG;
5528                 #assert($patch_line !~ m!$/$!) if DEBUG; # is chomp-ed
5529                 $patch_number++;
5530                 # print "git diff" header
5531                 print format_git_diff_header_line($patch_line, $diffinfo,
5532                                                   \%from, \%to);
5533
5534                 # print extended diff header
5535                 print "<div class=\"diff extended_header\">\n";
5536         EXTENDED_HEADER:
5537                 while ($patch_line = <$fd>) {
5538                         chomp $patch_line;
5539
5540                         last EXTENDED_HEADER if ($patch_line =~ m/^--- |^diff /);
5541
5542                         print format_extended_diff_header_line($patch_line, $diffinfo,
5543                                                                \%from, \%to);
5544                 }
5545                 print "</div>\n"; # class="diff extended_header"
5546
5547                 # from-file/to-file diff header
5548                 if (! $patch_line) {
5549                         print "</div>\n"; # class="patch"
5550                         last PATCH;
5551                 }
5552                 next PATCH if ($patch_line =~ m/^diff /);
5553                 #assert($patch_line =~ m/^---/) if DEBUG;
5554
5555                 my $last_patch_line = $patch_line;
5556                 $patch_line = <$fd>;
5557                 chomp $patch_line;
5558                 #assert($patch_line =~ m/^\+\+\+/) if DEBUG;
5559
5560                 print format_diff_from_to_header($last_patch_line, $patch_line,
5561                                                  $diffinfo, \%from, \%to,
5562                                                  @hash_parents);
5563
5564                 # the patch itself
5565         LINE:
5566                 while ($patch_line = <$fd>) {
5567                         chomp $patch_line;
5568
5569                         next PATCH if ($patch_line =~ m/^diff /);
5570
5571                         my $class = diff_line_class($patch_line, \%from, \%to);
5572
5573                         if ($class eq 'chunk_header') {
5574                                 print_diff_chunk($diff_style, scalar @hash_parents, \%from, \%to, @chunk);
5575                                 @chunk = ();
5576                         }
5577
5578                         push @chunk, [ $class, $patch_line ];
5579                 }
5580
5581         } continue {
5582                 if (@chunk) {
5583                         print_diff_chunk($diff_style, scalar @hash_parents, \%from, \%to, @chunk);
5584                         @chunk = ();
5585                 }
5586                 print "</div>\n"; # class="patch"
5587         }
5588
5589         # for compact combined (--cc) format, with chunk and patch simplification
5590         # the patchset might be empty, but there might be unprocessed raw lines
5591         for (++$patch_idx if $patch_number > 0;
5592              $patch_idx < @$difftree;
5593              ++$patch_idx) {
5594                 # read and prepare patch information
5595                 $diffinfo = parsed_difftree_line($difftree->[$patch_idx]);
5596
5597                 # generate anchor for "patch" links in difftree / whatchanged part
5598                 print "<div class=\"patch\" id=\"patch". ($patch_idx+1) ."\">\n" .
5599                       format_diff_cc_simplified($diffinfo, @hash_parents) .
5600                       "</div>\n";  # class="patch"
5601
5602                 $patch_number++;
5603         }
5604
5605         if ($patch_number == 0) {
5606                 if (@hash_parents > 1) {
5607                         print "<div class=\"diff nodifferences\">Trivial merge</div>\n";
5608                 } else {
5609                         print "<div class=\"diff nodifferences\">No differences found</div>\n";
5610                 }
5611         }
5612
5613         print "</div>\n"; # class="patchset"
5614 }
5615
5616 # . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5617
5618 sub git_project_search_form {
5619         my ($searchtext, $search_use_regexp) = @_;
5620
5621         my $limit = '';
5622         if ($project_filter) {
5623                 $limit = " in '$project_filter/'";
5624         }
5625
5626         print "<div class=\"projsearch\">\n";
5627         print $cgi->start_form(-method => 'get', -action => $my_uri) .
5628               $cgi->hidden(-name => 'a', -value => 'project_list')  . "\n";
5629         print $cgi->hidden(-name => 'pf', -value => $project_filter). "\n"
5630                 if (defined $project_filter);
5631         print $cgi->textfield(-name => 's', -value => $searchtext,
5632                               -title => "Search project by name and description$limit",
5633                               -size => 60) . "\n" .
5634               "<span title=\"Extended regular expression\">" .
5635               $cgi->checkbox(-name => 'sr', -value => 1, -label => 're',
5636                              -checked => $search_use_regexp) .
5637               "</span>\n" .
5638               $cgi->submit(-name => 'btnS', -value => 'Search') .
5639               $cgi->end_form() . "\n" .
5640               $cgi->a({-href => href(project => undef, searchtext => undef,
5641                                      project_filter => $project_filter)},
5642                       esc_html("List all projects$limit")) . "<br />\n";
5643         print "</div>\n";
5644 }
5645
5646 # entry for given @keys needs filling if at least one of keys in list
5647 # is not present in %$project_info
5648 sub project_info_needs_filling {
5649         my ($project_info, @keys) = @_;
5650
5651         # return List::MoreUtils::any { !exists $project_info->{$_} } @keys;
5652         foreach my $key (@keys) {
5653                 if (!exists $project_info->{$key}) {
5654                         return 1;
5655                 }
5656         }
5657         return;
5658 }
5659
5660 # fills project list info (age, description, owner, category, forks, etc.)
5661 # for each project in the list, removing invalid projects from
5662 # returned list, or fill only specified info.
5663 #
5664 # Invalid projects are removed from the returned list if and only if you
5665 # ask 'age' or 'age_string' to be filled, because they are the only fields
5666 # that run unconditionally git command that requires repository, and
5667 # therefore do always check if project repository is invalid.
5668 #
5669 # USAGE:
5670 # * fill_project_list_info(\@project_list, 'descr_long', 'ctags')
5671 #   ensures that 'descr_long' and 'ctags' fields are filled
5672 # * @project_list = fill_project_list_info(\@project_list)
5673 #   ensures that all fields are filled (and invalid projects removed)
5674 #
5675 # NOTE: modifies $projlist, but does not remove entries from it
5676 sub fill_project_list_info {
5677         my ($projlist, @wanted_keys) = @_;
5678         my @projects;
5679         my $filter_set = sub { return @_; };
5680         if (@wanted_keys) {
5681                 my %wanted_keys = map { $_ => 1 } @wanted_keys;
5682                 $filter_set = sub { return grep { $wanted_keys{$_} } @_; };
5683         }
5684
5685         my $show_ctags = gitweb_check_feature('ctags');
5686  PROJECT:
5687         foreach my $pr (@$projlist) {
5688                 if (project_info_needs_filling($pr, $filter_set->('age', 'age_string'))) {
5689                         my (@activity) = git_get_last_activity($pr->{'path'});
5690                         unless (@activity) {
5691                                 next PROJECT;
5692                         }
5693                         ($pr->{'age'}, $pr->{'age_string'}) = @activity;
5694                 }
5695                 if (project_info_needs_filling($pr, $filter_set->('descr', 'descr_long'))) {
5696                         my $descr = git_get_project_description($pr->{'path'}) || "";
5697                         $descr = to_utf8($descr);
5698                         $pr->{'descr_long'} = $descr;
5699                         $pr->{'descr'} = chop_str($descr, $projects_list_description_width, 5);
5700                 }
5701                 if (project_info_needs_filling($pr, $filter_set->('owner'))) {
5702                         $pr->{'owner'} = git_get_project_owner("$pr->{'path'}") || "";
5703                 }
5704                 if ($show_ctags &&
5705                     project_info_needs_filling($pr, $filter_set->('ctags'))) {
5706                         $pr->{'ctags'} = git_get_project_ctags($pr->{'path'});
5707                 }
5708                 if ($projects_list_group_categories &&
5709                     project_info_needs_filling($pr, $filter_set->('category'))) {
5710                         my $cat = git_get_project_category($pr->{'path'}) ||
5711                                                            $project_list_default_category;
5712                         $pr->{'category'} = to_utf8($cat);
5713                 }
5714
5715                 push @projects, $pr;
5716         }
5717
5718         return @projects;
5719 }
5720
5721 sub sort_projects_list {
5722         my ($projlist, $order) = @_;
5723
5724         sub order_str {
5725                 my $key = shift;
5726                 return sub { $a->{$key} cmp $b->{$key} };
5727         }
5728
5729         sub order_num_then_undef {
5730                 my $key = shift;
5731                 return sub {
5732                         defined $a->{$key} ?
5733                                 (defined $b->{$key} ? $a->{$key} <=> $b->{$key} : -1) :
5734                                 (defined $b->{$key} ? 1 : 0)
5735                 };
5736         }
5737
5738         my %orderings = (
5739                 project => order_str('path'),
5740                 descr => order_str('descr_long'),
5741                 owner => order_str('owner'),
5742                 age => order_num_then_undef('age'),
5743         );
5744
5745         my $ordering = $orderings{$order};
5746         return defined $ordering ? sort $ordering @$projlist : @$projlist;
5747 }
5748
5749 # returns a hash of categories, containing the list of project
5750 # belonging to each category
5751 sub build_projlist_by_category {
5752         my ($projlist, $from, $to) = @_;
5753         my %categories;
5754
5755         $from = 0 unless defined $from;
5756         $to = $#$projlist if (!defined $to || $#$projlist < $to);
5757
5758         for (my $i = $from; $i <= $to; $i++) {
5759                 my $pr = $projlist->[$i];
5760                 push @{$categories{ $pr->{'category'} }}, $pr;
5761         }
5762
5763         return wantarray ? %categories : \%categories;
5764 }
5765
5766 # print 'sort by' <th> element, generating 'sort by $name' replay link
5767 # if that order is not selected
5768 sub print_sort_th {
5769         print format_sort_th(@_);
5770 }
5771
5772 sub format_sort_th {
5773         my ($name, $order, $header) = @_;
5774         my $sort_th = "";
5775         $header ||= ucfirst($name);
5776
5777         if ($order eq $name) {
5778                 $sort_th .= "<th>$header</th>\n";
5779         } else {
5780                 $sort_th .= "<th>" .
5781                             $cgi->a({-href => href(-replay=>1, order=>$name),
5782                                      -class => "header"}, $header) .
5783                             "</th>\n";
5784         }
5785
5786         return $sort_th;
5787 }
5788
5789 sub git_project_list_rows {
5790         my ($projlist, $from, $to, $check_forks) = @_;
5791
5792         $from = 0 unless defined $from;
5793         $to = $#$projlist if (!defined $to || $#$projlist < $to);
5794
5795         my $alternate = 1;
5796         for (my $i = $from; $i <= $to; $i++) {
5797                 my $pr = $projlist->[$i];
5798
5799                 if ($alternate) {
5800                         print "<tr class=\"dark\">\n";
5801                 } else {
5802                         print "<tr class=\"light\">\n";
5803                 }
5804                 $alternate ^= 1;
5805
5806                 if ($check_forks) {
5807                         print "<td>";
5808                         if ($pr->{'forks'}) {
5809                                 my $nforks = scalar @{$pr->{'forks'}};
5810                                 if ($nforks > 0) {
5811                                         print $cgi->a({-href => href(project=>$pr->{'path'}, action=>"forks"),
5812                                                        -title => "$nforks forks"}, "+");
5813                                 } else {
5814                                         print $cgi->span({-title => "$nforks forks"}, "+");
5815                                 }
5816                         }
5817                         print "</td>\n";
5818                 }
5819                 print "<td>" . $cgi->a({-href => href(project=>$pr->{'path'}, action=>"summary"),
5820                                         -class => "list"},
5821                                        esc_html_match_hl($pr->{'path'}, $search_regexp)) .
5822                       "</td>\n" .
5823                       "<td>" . $cgi->a({-href => href(project=>$pr->{'path'}, action=>"summary"),
5824                                         -class => "list",
5825                                         -title => $pr->{'descr_long'}},
5826                                         $search_regexp
5827                                         ? esc_html_match_hl_chopped($pr->{'descr_long'},
5828                                                                     $pr->{'descr'}, $search_regexp)
5829                                         : esc_html($pr->{'descr'})) .
5830                       "</td>\n";
5831                 unless ($omit_owner) {
5832                         print "<td><i>" . chop_and_escape_str($pr->{'owner'}, 15) . "</i></td>\n";
5833                 }
5834                 unless ($omit_age_column) {
5835                         print "<td class=\"". age_class($pr->{'age'}) . "\">" .
5836                             (defined $pr->{'age_string'} ? $pr->{'age_string'} : "No commits") . "</td>\n";
5837                 }
5838                 print"<td class=\"link\">" .
5839                       $cgi->a({-href => href(project=>$pr->{'path'}, action=>"summary")}, "summary")   . " | " .
5840                       $cgi->a({-href => href(project=>$pr->{'path'}, action=>"shortlog")}, "shortlog") . " | " .
5841                       $cgi->a({-href => href(project=>$pr->{'path'}, action=>"log")}, "log") . " | " .
5842                       $cgi->a({-href => href(project=>$pr->{'path'}, action=>"tree")}, "tree") .
5843                       ($pr->{'forks'} ? " | " . $cgi->a({-href => href(project=>$pr->{'path'}, action=>"forks")}, "forks") : '') .
5844                       "</td>\n" .
5845                       "</tr>\n";
5846         }
5847 }
5848
5849 sub git_project_list_body {
5850         # actually uses global variable $project
5851         my ($projlist, $order, $from, $to, $extra, $no_header) = @_;
5852         my @projects = @$projlist;
5853
5854         my $check_forks = gitweb_check_feature('forks');
5855         my $show_ctags  = gitweb_check_feature('ctags');
5856         my $tagfilter = $show_ctags ? $input_params{'ctag'} : undef;
5857         $check_forks = undef
5858                 if ($tagfilter || $search_regexp);
5859
5860         # filtering out forks before filling info allows to do less work
5861         @projects = filter_forks_from_projects_list(\@projects)
5862                 if ($check_forks);
5863         # search_projects_list pre-fills required info
5864         @projects = search_projects_list(\@projects,
5865                                          'search_regexp' => $search_regexp,
5866                                          'tagfilter'  => $tagfilter)
5867                 if ($tagfilter || $search_regexp);
5868         # fill the rest
5869         my @all_fields = ('descr', 'descr_long', 'ctags', 'category');
5870         push @all_fields, ('age', 'age_string') unless($omit_age_column);
5871         push @all_fields, 'owner' unless($omit_owner);
5872         @projects = fill_project_list_info(\@projects, @all_fields);
5873
5874         $order ||= $default_projects_order;
5875         $from = 0 unless defined $from;
5876         $to = $#projects if (!defined $to || $#projects < $to);
5877
5878         # short circuit
5879         if ($from > $to) {
5880                 print "<center>\n".
5881                       "<b>No such projects found</b><br />\n".
5882                       "Click ".$cgi->a({-href=>href(project=>undef)},"here")." to view all projects<br />\n".
5883                       "</center>\n<br />\n";
5884                 return;
5885         }
5886
5887         @projects = sort_projects_list(\@projects, $order);
5888
5889         if ($show_ctags) {
5890                 my $ctags = git_gather_all_ctags(\@projects);
5891                 my $cloud = git_populate_project_tagcloud($ctags);
5892                 print git_show_project_tagcloud($cloud, 64);
5893         }
5894
5895         print "<table class=\"project_list\">\n";
5896         unless ($no_header) {
5897                 print "<tr>\n";
5898                 if ($check_forks) {
5899                         print "<th></th>\n";
5900                 }
5901                 print_sort_th('project', $order, 'Project');
5902                 print_sort_th('descr', $order, 'Description');
5903                 print_sort_th('owner', $order, 'Owner') unless $omit_owner;
5904                 print_sort_th('age', $order, 'Last Change') unless $omit_age_column;
5905                 print "<th></th>\n" . # for links
5906                       "</tr>\n";
5907         }
5908
5909         if ($projects_list_group_categories) {
5910                 # only display categories with projects in the $from-$to window
5911                 @projects = sort {$a->{'category'} cmp $b->{'category'}} @projects[$from..$to];
5912                 my %categories = build_projlist_by_category(\@projects, $from, $to);
5913                 foreach my $cat (sort keys %categories) {
5914                         unless ($cat eq "") {
5915                                 print "<tr>\n";
5916                                 if ($check_forks) {
5917                                         print "<td></td>\n";
5918                                 }
5919                                 print "<td class=\"category\" colspan=\"5\">".esc_html($cat)."</td>\n";
5920                                 print "</tr>\n";
5921                         }
5922
5923                         git_project_list_rows($categories{$cat}, undef, undef, $check_forks);
5924                 }
5925         } else {
5926                 git_project_list_rows(\@projects, $from, $to, $check_forks);
5927         }
5928
5929         if (defined $extra) {
5930                 print "<tr>\n";
5931                 if ($check_forks) {
5932                         print "<td></td>\n";
5933                 }
5934                 print "<td colspan=\"5\">$extra</td>\n" .
5935                       "</tr>\n";
5936         }
5937         print "</table>\n";
5938 }
5939
5940 sub git_log_body {
5941         # uses global variable $project
5942         my ($commitlist, $from, $to, $refs, $extra) = @_;
5943
5944         $from = 0 unless defined $from;
5945         $to = $#{$commitlist} if (!defined $to || $#{$commitlist} < $to);
5946
5947         for (my $i = 0; $i <= $to; $i++) {
5948                 my %co = %{$commitlist->[$i]};
5949                 next if !%co;
5950                 my $commit = $co{'id'};
5951                 my $ref = format_ref_marker($refs, $commit);
5952                 git_print_header_div('commit',
5953                                "<span class=\"age\">$co{'age_string'}</span>" .
5954                                esc_html($co{'title'}) . $ref,
5955                                $commit);
5956                 print "<div class=\"title_text\">\n" .
5957                       "<div class=\"log_link\">\n" .
5958                       $cgi->a({-href => href(action=>"commit", hash=>$commit)}, "commit") .
5959                       " | " .
5960                       $cgi->a({-href => href(action=>"commitdiff", hash=>$commit)}, "commitdiff") .
5961                       " | " .
5962                       $cgi->a({-href => href(action=>"tree", hash=>$commit, hash_base=>$commit)}, "tree") .
5963                       "<br/>\n" .
5964                       "</div>\n";
5965                       git_print_authorship(\%co, -tag => 'span');
5966                       print "<br/>\n</div>\n";
5967
5968                 print "<div class=\"log_body\">\n";
5969                 git_print_log($co{'comment'}, -final_empty_line=> 1);
5970                 print "</div>\n";
5971         }
5972         if ($extra) {
5973                 print "<div class=\"page_nav\">\n";
5974                 print "$extra\n";
5975                 print "</div>\n";
5976         }
5977 }
5978
5979 sub git_shortlog_body {
5980         # uses global variable $project
5981         my ($commitlist, $from, $to, $refs, $extra) = @_;
5982
5983         $from = 0 unless defined $from;
5984         $to = $#{$commitlist} if (!defined $to || $#{$commitlist} < $to);
5985
5986         print "<table class=\"shortlog\">\n";
5987         my $alternate = 1;
5988         for (my $i = $from; $i <= $to; $i++) {
5989                 my %co = %{$commitlist->[$i]};
5990                 my $commit = $co{'id'};
5991                 my $ref = format_ref_marker($refs, $commit);
5992                 if ($alternate) {
5993                         print "<tr class=\"dark\">\n";
5994                 } else {
5995                         print "<tr class=\"light\">\n";
5996                 }
5997                 $alternate ^= 1;
5998                 # git_summary() used print "<td><i>$co{'age_string'}</i></td>\n" .
5999                 print "<td title=\"$co{'age_string_age'}\"><i>$co{'age_string_date'}</i></td>\n" .
6000                       format_author_html('td', \%co, 10) . "<td>";
6001                 print format_subject_html($co{'title'}, $co{'title_short'},
6002                                           href(action=>"commit", hash=>$commit), $ref);
6003                 print "</td>\n" .
6004                       "<td class=\"link\">" .
6005                       $cgi->a({-href => href(action=>"commit", hash=>$commit)}, "commit") . " | " .
6006                       $cgi->a({-href => href(action=>"commitdiff", hash=>$commit)}, "commitdiff") . " | " .
6007                       $cgi->a({-href => href(action=>"tree", hash=>$commit, hash_base=>$commit)}, "tree");
6008                 my $snapshot_links = format_snapshot_links($commit);
6009                 if (defined $snapshot_links) {
6010                         print " | " . $snapshot_links;
6011                 }
6012                 print "</td>\n" .
6013                       "</tr>\n";
6014         }
6015         if (defined $extra) {
6016                 print "<tr>\n" .
6017                       "<td colspan=\"4\">$extra</td>\n" .
6018                       "</tr>\n";
6019         }
6020         print "</table>\n";
6021 }
6022
6023 sub git_history_body {
6024         # Warning: assumes constant type (blob or tree) during history
6025         my ($commitlist, $from, $to, $refs, $extra,
6026             $file_name, $file_hash, $ftype) = @_;
6027
6028         $from = 0 unless defined $from;
6029         $to = $#{$commitlist} unless (defined $to && $to <= $#{$commitlist});
6030
6031         print "<table class=\"history\">\n";
6032         my $alternate = 1;
6033         for (my $i = $from; $i <= $to; $i++) {
6034                 my %co = %{$commitlist->[$i]};
6035                 if (!%co) {
6036                         next;
6037                 }
6038                 my $commit = $co{'id'};
6039
6040                 my $ref = format_ref_marker($refs, $commit);
6041
6042                 if ($alternate) {
6043                         print "<tr class=\"dark\">\n";
6044                 } else {
6045                         print "<tr class=\"light\">\n";
6046                 }
6047                 $alternate ^= 1;
6048                 print "<td title=\"$co{'age_string_age'}\"><i>$co{'age_string_date'}</i></td>\n" .
6049         # shortlog:   format_author_html('td', \%co, 10)
6050                       format_author_html('td', \%co, 15, 3) . "<td>";
6051                 # originally git_history used chop_str($co{'title'}, 50)
6052                 print format_subject_html($co{'title'}, $co{'title_short'},
6053                                           href(action=>"commit", hash=>$commit), $ref);
6054                 print "</td>\n" .
6055                       "<td class=\"link\">" .
6056                       $cgi->a({-href => href(action=>$ftype, hash_base=>$commit, file_name=>$file_name)}, $ftype) . " | " .
6057                       $cgi->a({-href => href(action=>"commitdiff", hash=>$commit)}, "commitdiff");
6058
6059                 if ($ftype eq 'blob') {
6060                         my $blob_current = $file_hash;
6061                         my $blob_parent  = git_get_hash_by_path($commit, $file_name);
6062                         if (defined $blob_current && defined $blob_parent &&
6063                                         $blob_current ne $blob_parent) {
6064                                 print " | " .
6065                                         $cgi->a({-href => href(action=>"blobdiff",
6066                                                                hash=>$blob_current, hash_parent=>$blob_parent,
6067                                                                hash_base=>$hash_base, hash_parent_base=>$commit,
6068                                                                file_name=>$file_name)},
6069                                                 "diff to current");
6070                         }
6071                 }
6072                 print "</td>\n" .
6073                       "</tr>\n";
6074         }
6075         if (defined $extra) {
6076                 print "<tr>\n" .
6077                       "<td colspan=\"4\">$extra</td>\n" .
6078                       "</tr>\n";
6079         }
6080         print "</table>\n";
6081 }
6082
6083 sub git_tags_body {
6084         # uses global variable $project
6085         my ($taglist, $from, $to, $extra) = @_;
6086         $from = 0 unless defined $from;
6087         $to = $#{$taglist} if (!defined $to || $#{$taglist} < $to);
6088
6089         print "<table class=\"tags\">\n";
6090         my $alternate = 1;
6091         for (my $i = $from; $i <= $to; $i++) {
6092                 my $entry = $taglist->[$i];
6093                 my %tag = %$entry;
6094                 my $comment = $tag{'subject'};
6095                 my $comment_short;
6096                 if (defined $comment) {
6097                         $comment_short = chop_str($comment, 30, 5);
6098                 }
6099                 if ($alternate) {
6100                         print "<tr class=\"dark\">\n";
6101                 } else {
6102                         print "<tr class=\"light\">\n";
6103                 }
6104                 $alternate ^= 1;
6105                 if (defined $tag{'age'}) {
6106                         print "<td><i>$tag{'age'}</i></td>\n";
6107                 } else {
6108                         print "<td></td>\n";
6109                 }
6110                 print "<td>" .
6111                       $cgi->a({-href => href(action=>$tag{'reftype'}, hash=>$tag{'refid'}),
6112                                -class => "list name"}, esc_html($tag{'name'})) .
6113                       "</td>\n" .
6114                       "<td>";
6115                 if (defined $comment) {
6116                         print format_subject_html($comment, $comment_short,
6117                                                   href(action=>"tag", hash=>$tag{'id'}));
6118                 }
6119                 print "</td>\n" .
6120                       "<td class=\"selflink\">";
6121                 if ($tag{'type'} eq "tag") {
6122                         print $cgi->a({-href => href(action=>"tag", hash=>$tag{'id'})}, "tag");
6123                 } else {
6124                         print "&nbsp;";
6125                 }
6126                 print "</td>\n" .
6127                       "<td class=\"link\">" . " | " .
6128                       $cgi->a({-href => href(action=>$tag{'reftype'}, hash=>$tag{'refid'})}, $tag{'reftype'});
6129                 if ($tag{'reftype'} eq "commit") {
6130                         print " | " . $cgi->a({-href => href(action=>"shortlog", hash=>$tag{'fullname'})}, "shortlog") .
6131                               " | " . $cgi->a({-href => href(action=>"log", hash=>$tag{'fullname'})}, "log");
6132                 } elsif ($tag{'reftype'} eq "blob") {
6133                         print " | " . $cgi->a({-href => href(action=>"blob_plain", hash=>$tag{'refid'})}, "raw");
6134                 }
6135                 print "</td>\n" .
6136                       "</tr>";
6137         }
6138         if (defined $extra) {
6139                 print "<tr>\n" .
6140                       "<td colspan=\"5\">$extra</td>\n" .
6141                       "</tr>\n";
6142         }
6143         print "</table>\n";
6144 }
6145
6146 sub git_heads_body {
6147         # uses global variable $project
6148         my ($headlist, $head_at, $from, $to, $extra) = @_;
6149         $from = 0 unless defined $from;
6150         $to = $#{$headlist} if (!defined $to || $#{$headlist} < $to);
6151
6152         print "<table class=\"heads\">\n";
6153         my $alternate = 1;
6154         for (my $i = $from; $i <= $to; $i++) {
6155                 my $entry = $headlist->[$i];
6156                 my %ref = %$entry;
6157                 my $curr = defined $head_at && $ref{'id'} eq $head_at;
6158                 if ($alternate) {
6159                         print "<tr class=\"dark\">\n";
6160                 } else {
6161                         print "<tr class=\"light\">\n";
6162                 }
6163                 $alternate ^= 1;
6164                 print "<td><i>$ref{'age'}</i></td>\n" .
6165                       ($curr ? "<td class=\"current_head\">" : "<td>") .
6166                       $cgi->a({-href => href(action=>"shortlog", hash=>$ref{'fullname'}),
6167                                -class => "list name"},esc_html($ref{'name'})) .
6168                       "</td>\n" .
6169                       "<td class=\"link\">" .
6170                       $cgi->a({-href => href(action=>"shortlog", hash=>$ref{'fullname'})}, "shortlog") . " | " .
6171                       $cgi->a({-href => href(action=>"log", hash=>$ref{'fullname'})}, "log") . " | " .
6172                       $cgi->a({-href => href(action=>"tree", hash=>$ref{'fullname'}, hash_base=>$ref{'fullname'})}, "tree") .
6173                       "</td>\n" .
6174                       "</tr>";
6175         }
6176         if (defined $extra) {
6177                 print "<tr>\n" .
6178                       "<td colspan=\"3\">$extra</td>\n" .
6179                       "</tr>\n";
6180         }
6181         print "</table>\n";
6182 }
6183
6184 # Display a single remote block
6185 sub git_remote_block {
6186         my ($remote, $rdata, $limit, $head) = @_;
6187
6188         my $heads = $rdata->{'heads'};
6189         my $fetch = $rdata->{'fetch'};
6190         my $push = $rdata->{'push'};
6191
6192         my $urls_table = "<table class=\"projects_list\">\n" ;
6193
6194         if (defined $fetch) {
6195                 if ($fetch eq $push) {
6196                         $urls_table .= format_repo_url("URL", $fetch);
6197                 } else {
6198                         $urls_table .= format_repo_url("Fetch URL", $fetch);
6199                         $urls_table .= format_repo_url("Push URL", $push) if defined $push;
6200                 }
6201         } elsif (defined $push) {
6202                 $urls_table .= format_repo_url("Push URL", $push);
6203         } else {
6204                 $urls_table .= format_repo_url("", "No remote URL");
6205         }
6206
6207         $urls_table .= "</table>\n";
6208
6209         my $dots;
6210         if (defined $limit && $limit < @$heads) {
6211                 $dots = $cgi->a({-href => href(action=>"remotes", hash=>$remote)}, "...");
6212         }
6213
6214         print $urls_table;
6215         git_heads_body($heads, $head, 0, $limit, $dots);
6216 }
6217
6218 # Display a list of remote names with the respective fetch and push URLs
6219 sub git_remotes_list {
6220         my ($remotedata, $limit) = @_;
6221         print "<table class=\"heads\">\n";
6222         my $alternate = 1;
6223         my @remotes = sort keys %$remotedata;
6224
6225         my $limited = $limit && $limit < @remotes;
6226
6227         $#remotes = $limit - 1 if $limited;
6228
6229         while (my $remote = shift @remotes) {
6230                 my $rdata = $remotedata->{$remote};
6231                 my $fetch = $rdata->{'fetch'};
6232                 my $push = $rdata->{'push'};
6233                 if ($alternate) {
6234                         print "<tr class=\"dark\">\n";
6235                 } else {
6236                         print "<tr class=\"light\">\n";
6237                 }
6238                 $alternate ^= 1;
6239                 print "<td>" .
6240                       $cgi->a({-href=> href(action=>'remotes', hash=>$remote),
6241                                -class=> "list name"},esc_html($remote)) .
6242                       "</td>";
6243                 print "<td class=\"link\">" .
6244                       (defined $fetch ? $cgi->a({-href=> $fetch}, "fetch") : "fetch") .
6245                       " | " .
6246                       (defined $push ? $cgi->a({-href=> $push}, "push") : "push") .
6247                       "</td>";
6248
6249                 print "</tr>\n";
6250         }
6251
6252         if ($limited) {
6253                 print "<tr>\n" .
6254                       "<td colspan=\"3\">" .
6255                       $cgi->a({-href => href(action=>"remotes")}, "...") .
6256                       "</td>\n" . "</tr>\n";
6257         }
6258
6259         print "</table>";
6260 }
6261
6262 # Display remote heads grouped by remote, unless there are too many
6263 # remotes, in which case we only display the remote names
6264 sub git_remotes_body {
6265         my ($remotedata, $limit, $head) = @_;
6266         if ($limit and $limit < keys %$remotedata) {
6267                 git_remotes_list($remotedata, $limit);
6268         } else {
6269                 fill_remote_heads($remotedata);
6270                 while (my ($remote, $rdata) = each %$remotedata) {
6271                         git_print_section({-class=>"remote", -id=>$remote},
6272                                 ["remotes", $remote, $remote], sub {
6273                                         git_remote_block($remote, $rdata, $limit, $head);
6274                                 });
6275                 }
6276         }
6277 }
6278
6279 sub git_search_message {
6280         my %co = @_;
6281
6282         my $greptype;
6283         if ($searchtype eq 'commit') {
6284                 $greptype = "--grep=";
6285         } elsif ($searchtype eq 'author') {
6286                 $greptype = "--author=";
6287         } elsif ($searchtype eq 'committer') {
6288                 $greptype = "--committer=";
6289         }
6290         $greptype .= $searchtext;
6291         my @commitlist = parse_commits($hash, 101, (100 * $page), undef,
6292                                        $greptype, '--regexp-ignore-case',
6293                                        $search_use_regexp ? '--extended-regexp' : '--fixed-strings');
6294
6295         my $paging_nav = '';
6296         if ($page > 0) {
6297                 $paging_nav .=
6298                         $cgi->a({-href => href(-replay=>1, page=>undef)},
6299                                 "first") .
6300                         " &sdot; " .
6301                         $cgi->a({-href => href(-replay=>1, page=>$page-1),
6302                                  -accesskey => "p", -title => "Alt-p"}, "prev");
6303         } else {
6304                 $paging_nav .= "first &sdot; prev";
6305         }
6306         my $next_link = '';
6307         if ($#commitlist >= 100) {
6308                 $next_link =
6309                         $cgi->a({-href => href(-replay=>1, page=>$page+1),
6310                                  -accesskey => "n", -title => "Alt-n"}, "next");
6311                 $paging_nav .= " &sdot; $next_link";
6312         } else {
6313                 $paging_nav .= " &sdot; next";
6314         }
6315
6316         git_header_html();
6317
6318         git_print_page_nav('','', $hash,$co{'tree'},$hash, $paging_nav);
6319         git_print_header_div('commit', esc_html($co{'title'}), $hash);
6320         if ($page == 0 && !@commitlist) {
6321                 print "<p>No match.</p>\n";
6322         } else {
6323                 git_search_grep_body(\@commitlist, 0, 99, $next_link);
6324         }
6325
6326         git_footer_html();
6327 }
6328
6329 sub git_search_changes {
6330         my %co = @_;
6331
6332         local $/ = "\n";
6333         open my $fd, '-|', git_cmd(), '--no-pager', 'log', @diff_opts,
6334                 '--pretty=format:%H', '--no-abbrev', '--raw', "-S$searchtext",
6335                 ($search_use_regexp ? '--pickaxe-regex' : ())
6336                         or die_error(500, "Open git-log failed");
6337
6338         git_header_html();
6339
6340         git_print_page_nav('','', $hash,$co{'tree'},$hash);
6341         git_print_header_div('commit', esc_html($co{'title'}), $hash);
6342
6343         print "<table class=\"pickaxe search\">\n";
6344         my $alternate = 1;
6345         undef %co;
6346         my @files;
6347         while (my $line = <$fd>) {
6348                 chomp $line;
6349                 next unless $line;
6350
6351                 my %set = parse_difftree_raw_line($line);
6352                 if (defined $set{'commit'}) {
6353                         # finish previous commit
6354                         if (%co) {
6355                                 print "</td>\n" .
6356                                       "<td class=\"link\">" .
6357                                       $cgi->a({-href => href(action=>"commit", hash=>$co{'id'})},
6358                                               "commit") .
6359                                       " | " .
6360                                       $cgi->a({-href => href(action=>"tree", hash=>$co{'tree'},
6361                                                              hash_base=>$co{'id'})},
6362                                               "tree") .
6363                                       "</td>\n" .
6364                                       "</tr>\n";
6365                         }
6366
6367                         if ($alternate) {
6368                                 print "<tr class=\"dark\">\n";
6369                         } else {
6370                                 print "<tr class=\"light\">\n";
6371                         }
6372                         $alternate ^= 1;
6373                         %co = parse_commit($set{'commit'});
6374                         my $author = chop_and_escape_str($co{'author_name'}, 15, 5);
6375                         print "<td title=\"$co{'age_string_age'}\"><i>$co{'age_string_date'}</i></td>\n" .
6376                               "<td><i>$author</i></td>\n" .
6377                               "<td>" .
6378                               $cgi->a({-href => href(action=>"commit", hash=>$co{'id'}),
6379                                       -class => "list subject"},
6380                                       chop_and_escape_str($co{'title'}, 50) . "<br/>");
6381                 } elsif (defined $set{'to_id'}) {
6382                         next if ($set{'to_id'} =~ m/^0{40}$/);
6383
6384                         print $cgi->a({-href => href(action=>"blob", hash_base=>$co{'id'},
6385                                                      hash=>$set{'to_id'}, file_name=>$set{'to_file'}),
6386                                       -class => "list"},
6387                                       "<span class=\"match\">" . esc_path($set{'file'}) . "</span>") .
6388                               "<br/>\n";
6389                 }
6390         }
6391         close $fd;
6392
6393         # finish last commit (warning: repetition!)
6394         if (%co) {
6395                 print "</td>\n" .
6396                       "<td class=\"link\">" .
6397                       $cgi->a({-href => href(action=>"commit", hash=>$co{'id'})},
6398                               "commit") .
6399                       " | " .
6400                       $cgi->a({-href => href(action=>"tree", hash=>$co{'tree'},
6401                                              hash_base=>$co{'id'})},
6402                               "tree") .
6403                       "</td>\n" .
6404                       "</tr>\n";
6405         }
6406
6407         print "</table>\n";
6408
6409         git_footer_html();
6410 }
6411
6412 sub git_search_files {
6413         my %co = @_;
6414
6415         local $/ = "\n";
6416         open my $fd, "-|", git_cmd(), 'grep', '-n', '-z',
6417                 $search_use_regexp ? ('-E', '-i') : '-F',
6418                 $searchtext, $co{'tree'}
6419                         or die_error(500, "Open git-grep failed");
6420
6421         git_header_html();
6422
6423         git_print_page_nav('','', $hash,$co{'tree'},$hash);
6424         git_print_header_div('commit', esc_html($co{'title'}), $hash);
6425
6426         print "<table class=\"grep_search\">\n";
6427         my $alternate = 1;
6428         my $matches = 0;
6429         my $lastfile = '';
6430         my $file_href;
6431         while (my $line = <$fd>) {
6432                 chomp $line;
6433                 my ($file, $lno, $ltext, $binary);
6434                 last if ($matches++ > 1000);
6435                 if ($line =~ /^Binary file (.+) matches$/) {
6436                         $file = $1;
6437                         $binary = 1;
6438                 } else {
6439                         ($file, $lno, $ltext) = split(/\0/, $line, 3);
6440                         $file =~ s/^$co{'tree'}://;
6441                 }
6442                 if ($file ne $lastfile) {
6443                         $lastfile and print "</td></tr>\n";
6444                         if ($alternate++) {
6445                                 print "<tr class=\"dark\">\n";
6446                         } else {
6447                                 print "<tr class=\"light\">\n";
6448                         }
6449                         $file_href = href(action=>"blob", hash_base=>$co{'id'},
6450                                           file_name=>$file);
6451                         print "<td class=\"list\">".
6452                                 $cgi->a({-href => $file_href, -class => "list"}, esc_path($file));
6453                         print "</td><td>\n";
6454                         $lastfile = $file;
6455                 }
6456                 if ($binary) {
6457                         print "<div class=\"binary\">Binary file</div>\n";
6458                 } else {
6459                         $ltext = untabify($ltext);
6460                         if ($ltext =~ m/^(.*)($search_regexp)(.*)$/i) {
6461                                 $ltext = esc_html($1, -nbsp=>1);
6462                                 $ltext .= '<span class="match">';
6463                                 $ltext .= esc_html($2, -nbsp=>1);
6464                                 $ltext .= '</span>';
6465                                 $ltext .= esc_html($3, -nbsp=>1);
6466                         } else {
6467                                 $ltext = esc_html($ltext, -nbsp=>1);
6468                         }
6469                         print "<div class=\"pre\">" .
6470                                 $cgi->a({-href => $file_href.'#l'.$lno,
6471                                         -class => "linenr"}, sprintf('%4i', $lno)) .
6472                                 ' ' .  $ltext . "</div>\n";
6473                 }
6474         }
6475         if ($lastfile) {
6476                 print "</td></tr>\n";
6477                 if ($matches > 1000) {
6478                         print "<div class=\"diff nodifferences\">Too many matches, listing trimmed</div>\n";
6479                 }
6480         } else {
6481                 print "<div class=\"diff nodifferences\">No matches found</div>\n";
6482         }
6483         close $fd;
6484
6485         print "</table>\n";
6486
6487         git_footer_html();
6488 }
6489
6490 sub git_search_grep_body {
6491         my ($commitlist, $from, $to, $extra) = @_;
6492         $from = 0 unless defined $from;
6493         $to = $#{$commitlist} if (!defined $to || $#{$commitlist} < $to);
6494
6495         print "<table class=\"commit_search\">\n";
6496         my $alternate = 1;
6497         for (my $i = $from; $i <= $to; $i++) {
6498                 my %co = %{$commitlist->[$i]};
6499                 if (!%co) {
6500                         next;
6501                 }
6502                 my $commit = $co{'id'};
6503                 if ($alternate) {
6504                         print "<tr class=\"dark\">\n";
6505                 } else {
6506                         print "<tr class=\"light\">\n";
6507                 }
6508                 $alternate ^= 1;
6509                 print "<td title=\"$co{'age_string_age'}\"><i>$co{'age_string_date'}</i></td>\n" .
6510                       format_author_html('td', \%co, 15, 5) .
6511                       "<td>" .
6512                       $cgi->a({-href => href(action=>"commit", hash=>$co{'id'}),
6513                                -class => "list subject"},
6514                               chop_and_escape_str($co{'title'}, 50) . "<br/>");
6515                 my $comment = $co{'comment'};
6516                 foreach my $line (@$comment) {
6517                         if ($line =~ m/^(.*?)($search_regexp)(.*)$/i) {
6518                                 my ($lead, $match, $trail) = ($1, $2, $3);
6519                                 $match = chop_str($match, 70, 5, 'center');
6520                                 my $contextlen = int((80 - length($match))/2);
6521                                 $contextlen = 30 if ($contextlen > 30);
6522                                 $lead  = chop_str($lead,  $contextlen, 10, 'left');
6523                                 $trail = chop_str($trail, $contextlen, 10, 'right');
6524
6525                                 $lead  = esc_html($lead);
6526                                 $match = esc_html($match);
6527                                 $trail = esc_html($trail);
6528
6529                                 print "$lead<span class=\"match\">$match</span>$trail<br />";
6530                         }
6531                 }
6532                 print "</td>\n" .
6533                       "<td class=\"link\">" .
6534                       $cgi->a({-href => href(action=>"commit", hash=>$co{'id'})}, "commit") .
6535                       " | " .
6536                       $cgi->a({-href => href(action=>"commitdiff", hash=>$co{'id'})}, "commitdiff") .
6537                       " | " .
6538                       $cgi->a({-href => href(action=>"tree", hash=>$co{'tree'}, hash_base=>$co{'id'})}, "tree");
6539                 print "</td>\n" .
6540                       "</tr>\n";
6541         }
6542         if (defined $extra) {
6543                 print "<tr>\n" .
6544                       "<td colspan=\"3\">$extra</td>\n" .
6545                       "</tr>\n";
6546         }
6547         print "</table>\n";
6548 }
6549
6550 ## ======================================================================
6551 ## ======================================================================
6552 ## actions
6553
6554 sub git_project_list {
6555         my $order = $input_params{'order'};
6556         if (defined $order && $order !~ m/none|project|descr|owner|age/) {
6557                 die_error(400, "Unknown order parameter");
6558         }
6559
6560         my @list = git_get_projects_list($project_filter, $strict_export);
6561         if (!@list) {
6562                 die_error(404, "No projects found");
6563         }
6564
6565         git_header_html();
6566         if (defined $home_text && -f $home_text) {
6567                 print "<div class=\"index_include\">\n";
6568                 insert_file($home_text);
6569                 print "</div>\n";
6570         }
6571
6572         git_project_search_form($searchtext, $search_use_regexp);
6573         git_project_list_body(\@list, $order);
6574         git_footer_html();
6575 }
6576
6577 sub git_forks {
6578         my $order = $input_params{'order'};
6579         if (defined $order && $order !~ m/none|project|descr|owner|age/) {
6580                 die_error(400, "Unknown order parameter");
6581         }
6582
6583         my $filter = $project;
6584         $filter =~ s/\.git$//;
6585         my @list = git_get_projects_list($filter);
6586         if (!@list) {
6587                 die_error(404, "No forks found");
6588         }
6589
6590         git_header_html();
6591         git_print_page_nav('','');
6592         git_print_header_div('summary', "$project forks");
6593         git_project_list_body(\@list, $order);
6594         git_footer_html();
6595 }
6596
6597 sub git_project_index {
6598         my @projects = git_get_projects_list($project_filter, $strict_export);
6599         if (!@projects) {
6600                 die_error(404, "No projects found");
6601         }
6602
6603         print $cgi->header(
6604                 -type => 'text/plain',
6605                 -charset => 'utf-8',
6606                 -content_disposition => 'inline; filename="index.aux"');
6607
6608         foreach my $pr (@projects) {
6609                 if (!exists $pr->{'owner'}) {
6610                         $pr->{'owner'} = git_get_project_owner("$pr->{'path'}");
6611                 }
6612
6613                 my ($path, $owner) = ($pr->{'path'}, $pr->{'owner'});
6614                 # quote as in CGI::Util::encode, but keep the slash, and use '+' for ' '
6615                 $path  =~ s/([^a-zA-Z0-9_.\-\/ ])/sprintf("%%%02X", ord($1))/eg;
6616                 $owner =~ s/([^a-zA-Z0-9_.\-\/ ])/sprintf("%%%02X", ord($1))/eg;
6617                 $path  =~ s/ /\+/g;
6618                 $owner =~ s/ /\+/g;
6619
6620                 print "$path $owner\n";
6621         }
6622 }
6623
6624 sub git_summary {
6625         my $descr = git_get_project_description($project) || "none";
6626         my %co = parse_commit("HEAD");
6627         my %cd = %co ? parse_date($co{'committer_epoch'}, $co{'committer_tz'}) : ();
6628         my $head = $co{'id'};
6629         my $remote_heads = gitweb_check_feature('remote_heads');
6630
6631         my $owner = git_get_project_owner($project);
6632
6633         my $refs = git_get_references();
6634         # These get_*_list functions return one more to allow us to see if
6635         # there are more ...
6636         my @taglist  = git_get_tags_list(16);
6637         my @headlist = git_get_heads_list(16);
6638         my %remotedata = $remote_heads ? git_get_remotes_list() : ();
6639         my @forklist;
6640         my $check_forks = gitweb_check_feature('forks');
6641
6642         if ($check_forks) {
6643                 # find forks of a project
6644                 my $filter = $project;
6645                 $filter =~ s/\.git$//;
6646                 @forklist = git_get_projects_list($filter);
6647                 # filter out forks of forks
6648                 @forklist = filter_forks_from_projects_list(\@forklist)
6649                         if (@forklist);
6650         }
6651
6652         git_header_html();
6653         git_print_page_nav('summary','', $head);
6654
6655         print "<div class=\"title\">&nbsp;</div>\n";
6656         print "<table class=\"projects_list\">\n" .
6657               "<tr id=\"metadata_desc\"><td>description</td><td>" . esc_html($descr) . "</td></tr>\n";
6658         if ($owner and not $omit_owner) {
6659                 print  "<tr id=\"metadata_owner\"><td>owner</td><td>" . email_obfuscate($owner) . "</td></tr>\n";
6660         }
6661         if (defined $cd{'rfc2822'}) {
6662                 print "<tr id=\"metadata_lchange\"><td>last change</td>" .
6663                       "<td>".format_timestamp_html(\%cd)."</td></tr>\n";
6664         }
6665
6666         # use per project git URL list in $projectroot/$project/cloneurl
6667         # or make project git URL from git base URL and project name
6668         my $url_tag = "URL";
6669         my @url_list = git_get_project_url_list($project);
6670         @url_list = map { "$_/$project" } @git_base_url_list unless @url_list;
6671         foreach my $git_url (@url_list) {
6672                 next unless $git_url;
6673                 print format_repo_url($url_tag, $git_url);
6674                 $url_tag = "";
6675         }
6676
6677         # Tag cloud
6678         my $show_ctags = gitweb_check_feature('ctags');
6679         if ($show_ctags) {
6680                 my $ctags = git_get_project_ctags($project);
6681                 if (%$ctags) {
6682                         # without ability to add tags, don't show if there are none
6683                         my $cloud = git_populate_project_tagcloud($ctags);
6684                         print "<tr id=\"metadata_ctags\">" .
6685                               "<td>content tags</td>" .
6686                               "<td>".git_show_project_tagcloud($cloud, 48)."</td>" .
6687                               "</tr>\n";
6688                 }
6689         }
6690
6691         print "</table>\n";
6692
6693         # If XSS prevention is on, we don't include README.html.
6694         # TODO: Allow a readme in some safe format.
6695         if (!$prevent_xss && -s "$projectroot/$project/README.html") {
6696                 print "<div class=\"title\">readme</div>\n" .
6697                       "<div class=\"readme\">\n";
6698                 insert_file("$projectroot/$project/README.html");
6699                 print "\n</div>\n"; # class="readme"
6700         }
6701
6702         # we need to request one more than 16 (0..15) to check if
6703         # those 16 are all
6704         my @commitlist = $head ? parse_commits($head, 17) : ();
6705         if (@commitlist) {
6706                 git_print_header_div('shortlog');
6707                 git_shortlog_body(\@commitlist, 0, 15, $refs,
6708                                   $#commitlist <=  15 ? undef :
6709                                   $cgi->a({-href => href(action=>"shortlog")}, "..."));
6710         }
6711
6712         if (@taglist) {
6713                 git_print_header_div('tags');
6714                 git_tags_body(\@taglist, 0, 15,
6715                               $#taglist <=  15 ? undef :
6716                               $cgi->a({-href => href(action=>"tags")}, "..."));
6717         }
6718
6719         if (@headlist) {
6720                 git_print_header_div('heads');
6721                 git_heads_body(\@headlist, $head, 0, 15,
6722                                $#headlist <= 15 ? undef :
6723                                $cgi->a({-href => href(action=>"heads")}, "..."));
6724         }
6725
6726         if (%remotedata) {
6727                 git_print_header_div('remotes');
6728                 git_remotes_body(\%remotedata, 15, $head);
6729         }
6730
6731         if (@forklist) {
6732                 git_print_header_div('forks');
6733                 git_project_list_body(\@forklist, 'age', 0, 15,
6734                                       $#forklist <= 15 ? undef :
6735                                       $cgi->a({-href => href(action=>"forks")}, "..."),
6736                                       'no_header');
6737         }
6738
6739         git_footer_html();
6740 }
6741
6742 sub git_tag {
6743         my %tag = parse_tag($hash);
6744
6745         if (! %tag) {
6746                 die_error(404, "Unknown tag object");
6747         }
6748
6749         my $head = git_get_head_hash($project);
6750         git_header_html();
6751         git_print_page_nav('','', $head,undef,$head);
6752         git_print_header_div('commit', esc_html($tag{'name'}), $hash);
6753         print "<div class=\"title_text\">\n" .
6754               "<table class=\"object_header\">\n" .
6755               "<tr>\n" .
6756               "<td>object</td>\n" .
6757               "<td>" . $cgi->a({-class => "list", -href => href(action=>$tag{'type'}, hash=>$tag{'object'})},
6758                                $tag{'object'}) . "</td>\n" .
6759               "<td class=\"link\">" . $cgi->a({-href => href(action=>$tag{'type'}, hash=>$tag{'object'})},
6760                                               $tag{'type'}) . "</td>\n" .
6761               "</tr>\n";
6762         if (defined($tag{'author'})) {
6763                 git_print_authorship_rows(\%tag, 'author');
6764         }
6765         print "</table>\n\n" .
6766               "</div>\n";
6767         print "<div class=\"page_body\">";
6768         my $comment = $tag{'comment'};
6769         foreach my $line (@$comment) {
6770                 chomp $line;
6771                 print esc_html($line, -nbsp=>1) . "<br/>\n";
6772         }
6773         print "</div>\n";
6774         git_footer_html();
6775 }
6776
6777 sub git_blame_common {
6778         my $format = shift || 'porcelain';
6779         if ($format eq 'porcelain' && $input_params{'javascript'}) {
6780                 $format = 'incremental';
6781                 $action = 'blame_incremental'; # for page title etc
6782         }
6783
6784         # permissions
6785         gitweb_check_feature('blame')
6786                 or die_error(403, "Blame view not allowed");
6787
6788         # error checking
6789         die_error(400, "No file name given") unless $file_name;
6790         $hash_base ||= git_get_head_hash($project);
6791         die_error(404, "Couldn't find base commit") unless $hash_base;
6792         my %co = parse_commit($hash_base)
6793                 or die_error(404, "Commit not found");
6794         my $ftype = "blob";
6795         if (!defined $hash) {
6796                 $hash = git_get_hash_by_path($hash_base, $file_name, "blob")
6797                         or die_error(404, "Error looking up file");
6798         } else {
6799                 $ftype = git_get_type($hash);
6800                 if ($ftype !~ "blob") {
6801                         die_error(400, "Object is not a blob");
6802                 }
6803         }
6804
6805         my $fd;
6806         if ($format eq 'incremental') {
6807                 # get file contents (as base)
6808                 open $fd, "-|", git_cmd(), 'cat-file', 'blob', $hash
6809                         or die_error(500, "Open git-cat-file failed");
6810         } elsif ($format eq 'data') {
6811                 # run git-blame --incremental
6812                 open $fd, "-|", git_cmd(), "blame", "--incremental",
6813                         $hash_base, "--", $file_name
6814                         or die_error(500, "Open git-blame --incremental failed");
6815         } else {
6816                 # run git-blame --porcelain
6817                 open $fd, "-|", git_cmd(), "blame", '-p',
6818                         $hash_base, '--', $file_name
6819                         or die_error(500, "Open git-blame --porcelain failed");
6820         }
6821         binmode $fd, ':utf8';
6822
6823         # incremental blame data returns early
6824         if ($format eq 'data') {
6825                 print $cgi->header(
6826                         -type=>"text/plain", -charset => "utf-8",
6827                         -status=> "200 OK");
6828                 local $| = 1; # output autoflush
6829                 while (my $line = <$fd>) {
6830                         print to_utf8($line);
6831                 }
6832                 close $fd
6833                         or print "ERROR $!\n";
6834
6835                 print 'END';
6836                 if (defined $t0 && gitweb_check_feature('timed')) {
6837                         print ' '.
6838                               tv_interval($t0, [ gettimeofday() ]).
6839                               ' '.$number_of_git_cmds;
6840                 }
6841                 print "\n";
6842
6843                 return;
6844         }
6845
6846         # page header
6847         git_header_html();
6848         my $formats_nav =
6849                 $cgi->a({-href => href(action=>"blob", -replay=>1)},
6850                         "blob") .
6851                 " | ";
6852         if ($format eq 'incremental') {
6853                 $formats_nav .=
6854                         $cgi->a({-href => href(action=>"blame", javascript=>0, -replay=>1)},
6855                                 "blame") . " (non-incremental)";
6856         } else {
6857                 $formats_nav .=
6858                         $cgi->a({-href => href(action=>"blame_incremental", -replay=>1)},
6859                                 "blame") . " (incremental)";
6860         }
6861         $formats_nav .=
6862                 " | " .
6863                 $cgi->a({-href => href(action=>"history", -replay=>1)},
6864                         "history") .
6865                 " | " .
6866                 $cgi->a({-href => href(action=>$action, file_name=>$file_name)},
6867                         "HEAD");
6868         git_print_page_nav('','', $hash_base,$co{'tree'},$hash_base, $formats_nav);
6869         git_print_header_div('commit', esc_html($co{'title'}), $hash_base);
6870         git_print_page_path($file_name, $ftype, $hash_base);
6871
6872         # page body
6873         if ($format eq 'incremental') {
6874                 print "<noscript>\n<div class=\"error\"><center><b>\n".
6875                       "This page requires JavaScript to run.\n Use ".
6876                       $cgi->a({-href => href(action=>'blame',javascript=>0,-replay=>1)},
6877                               'this page').
6878                       " instead.\n".
6879                       "</b></center></div>\n</noscript>\n";
6880
6881                 print qq!<div id="progress_bar" style="width: 100%; background-color: yellow"></div>\n!;
6882         }
6883
6884         print qq!<div class="page_body">\n!;
6885         print qq!<div id="progress_info">... / ...</div>\n!
6886                 if ($format eq 'incremental');
6887         print qq!<table id="blame_table" class="blame" width="100%">\n!.
6888               #qq!<col width="5.5em" /><col width="2.5em" /><col width="*" />\n!.
6889               qq!<thead>\n!.
6890               qq!<tr><th>Commit</th><th>Line</th><th>Data</th></tr>\n!.
6891               qq!</thead>\n!.
6892               qq!<tbody>\n!;
6893
6894         my @rev_color = qw(light dark);
6895         my $num_colors = scalar(@rev_color);
6896         my $current_color = 0;
6897
6898         if ($format eq 'incremental') {
6899                 my $color_class = $rev_color[$current_color];
6900
6901                 #contents of a file
6902                 my $linenr = 0;
6903         LINE:
6904                 while (my $line = <$fd>) {
6905                         chomp $line;
6906                         $linenr++;
6907
6908                         print qq!<tr id="l$linenr" class="$color_class">!.
6909                               qq!<td class="sha1"><a href=""> </a></td>!.
6910                               qq!<td class="linenr">!.
6911                               qq!<a class="linenr" href="">$linenr</a></td>!;
6912                         print qq!<td class="pre">! . esc_html($line) . "</td>\n";
6913                         print qq!</tr>\n!;
6914                 }
6915
6916         } else { # porcelain, i.e. ordinary blame
6917                 my %metainfo = (); # saves information about commits
6918
6919                 # blame data
6920         LINE:
6921                 while (my $line = <$fd>) {
6922                         chomp $line;
6923                         # the header: <SHA-1> <src lineno> <dst lineno> [<lines in group>]
6924                         # no <lines in group> for subsequent lines in group of lines
6925                         my ($full_rev, $orig_lineno, $lineno, $group_size) =
6926                            ($line =~ /^([0-9a-f]{40}) (\d+) (\d+)(?: (\d+))?$/);
6927                         if (!exists $metainfo{$full_rev}) {
6928                                 $metainfo{$full_rev} = { 'nprevious' => 0 };
6929                         }
6930                         my $meta = $metainfo{$full_rev};
6931                         my $data;
6932                         while ($data = <$fd>) {
6933                                 chomp $data;
6934                                 last if ($data =~ s/^\t//); # contents of line
6935                                 if ($data =~ /^(\S+)(?: (.*))?$/) {
6936                                         $meta->{$1} = $2 unless exists $meta->{$1};
6937                                 }
6938                                 if ($data =~ /^previous /) {
6939                                         $meta->{'nprevious'}++;
6940                                 }
6941                         }
6942                         my $short_rev = substr($full_rev, 0, 8);
6943                         my $author = $meta->{'author'};
6944                         my %date =
6945                                 parse_date($meta->{'author-time'}, $meta->{'author-tz'});
6946                         my $date = $date{'iso-tz'};
6947                         if ($group_size) {
6948                                 $current_color = ($current_color + 1) % $num_colors;
6949                         }
6950                         my $tr_class = $rev_color[$current_color];
6951                         $tr_class .= ' boundary' if (exists $meta->{'boundary'});
6952                         $tr_class .= ' no-previous' if ($meta->{'nprevious'} == 0);
6953                         $tr_class .= ' multiple-previous' if ($meta->{'nprevious'} > 1);
6954                         print "<tr id=\"l$lineno\" class=\"$tr_class\">\n";
6955                         if ($group_size) {
6956                                 print "<td class=\"sha1\"";
6957                                 print " title=\"". esc_html($author) . ", $date\"";
6958                                 print " rowspan=\"$group_size\"" if ($group_size > 1);
6959                                 print ">";
6960                                 print $cgi->a({-href => href(action=>"commit",
6961                                                              hash=>$full_rev,
6962                                                              file_name=>$file_name)},
6963                                               esc_html($short_rev));
6964                                 if ($group_size >= 2) {
6965                                         my @author_initials = ($author =~ /\b([[:upper:]])\B/g);
6966                                         if (@author_initials) {
6967                                                 print "<br />" .
6968                                                       esc_html(join('', @author_initials));
6969                                                 #           or join('.', ...)
6970                                         }
6971                                 }
6972                                 print "</td>\n";
6973                         }
6974                         # 'previous' <sha1 of parent commit> <filename at commit>
6975                         if (exists $meta->{'previous'} &&
6976                             $meta->{'previous'} =~ /^([a-fA-F0-9]{40}) (.*)$/) {
6977                                 $meta->{'parent'} = $1;
6978                                 $meta->{'file_parent'} = unquote($2);
6979                         }
6980                         my $linenr_commit =
6981                                 exists($meta->{'parent'}) ?
6982                                 $meta->{'parent'} : $full_rev;
6983                         my $linenr_filename =
6984                                 exists($meta->{'file_parent'}) ?
6985                                 $meta->{'file_parent'} : unquote($meta->{'filename'});
6986                         my $blamed = href(action => 'blame',
6987                                           file_name => $linenr_filename,
6988                                           hash_base => $linenr_commit);
6989                         print "<td class=\"linenr\">";
6990                         print $cgi->a({ -href => "$blamed#l$orig_lineno",
6991                                         -class => "linenr" },
6992                                       esc_html($lineno));
6993                         print "</td>";
6994                         print "<td class=\"pre\">" . esc_html($data) . "</td>\n";
6995                         print "</tr>\n";
6996                 } # end while
6997
6998         }
6999
7000         # footer
7001         print "</tbody>\n".
7002               "</table>\n"; # class="blame"
7003         print "</div>\n";   # class="blame_body"
7004         close $fd
7005                 or print "Reading blob failed\n";
7006
7007         git_footer_html();
7008 }
7009
7010 sub git_blame {
7011         git_blame_common();
7012 }
7013
7014 sub git_blame_incremental {
7015         git_blame_common('incremental');
7016 }
7017
7018 sub git_blame_data {
7019         git_blame_common('data');
7020 }
7021
7022 sub git_tags {
7023         my $head = git_get_head_hash($project);
7024         git_header_html();
7025         git_print_page_nav('','', $head,undef,$head,format_ref_views('tags'));
7026         git_print_header_div('summary', $project);
7027
7028         my @tagslist = git_get_tags_list();
7029         if (@tagslist) {
7030                 git_tags_body(\@tagslist);
7031         }
7032         git_footer_html();
7033 }
7034
7035 sub git_heads {
7036         my $head = git_get_head_hash($project);
7037         git_header_html();
7038         git_print_page_nav('','', $head,undef,$head,format_ref_views('heads'));
7039         git_print_header_div('summary', $project);
7040
7041         my @headslist = git_get_heads_list();
7042         if (@headslist) {
7043                 git_heads_body(\@headslist, $head);
7044         }
7045         git_footer_html();
7046 }
7047
7048 # used both for single remote view and for list of all the remotes
7049 sub git_remotes {
7050         gitweb_check_feature('remote_heads')
7051                 or die_error(403, "Remote heads view is disabled");
7052
7053         my $head = git_get_head_hash($project);
7054         my $remote = $input_params{'hash'};
7055
7056         my $remotedata = git_get_remotes_list($remote);
7057         die_error(500, "Unable to get remote information") unless defined $remotedata;
7058
7059         unless (%$remotedata) {
7060                 die_error(404, defined $remote ?
7061                         "Remote $remote not found" :
7062                         "No remotes found");
7063         }
7064
7065         git_header_html(undef, undef, -action_extra => $remote);
7066         git_print_page_nav('', '',  $head, undef, $head,
7067                 format_ref_views($remote ? '' : 'remotes'));
7068
7069         fill_remote_heads($remotedata);
7070         if (defined $remote) {
7071                 git_print_header_div('remotes', "$remote remote for $project");
7072                 git_remote_block($remote, $remotedata->{$remote}, undef, $head);
7073         } else {
7074                 git_print_header_div('summary', "$project remotes");
7075                 git_remotes_body($remotedata, undef, $head);
7076         }
7077
7078         git_footer_html();
7079 }
7080
7081 sub git_blob_plain {
7082         my $type = shift;
7083         my $expires;
7084
7085         if (!defined $hash) {
7086                 if (defined $file_name) {
7087                         my $base = $hash_base || git_get_head_hash($project);
7088                         $hash = git_get_hash_by_path($base, $file_name, "blob")
7089                                 or die_error(404, "Cannot find file");
7090                 } else {
7091                         die_error(400, "No file name defined");
7092                 }
7093         } elsif ($hash =~ m/^[0-9a-fA-F]{40}$/) {
7094                 # blobs defined by non-textual hash id's can be cached
7095                 $expires = "+1d";
7096         }
7097
7098         open my $fd, "-|", git_cmd(), "cat-file", "blob", $hash
7099                 or die_error(500, "Open git-cat-file blob '$hash' failed");
7100
7101         # content-type (can include charset)
7102         $type = blob_contenttype($fd, $file_name, $type);
7103
7104         # "save as" filename, even when no $file_name is given
7105         my $save_as = "$hash";
7106         if (defined $file_name) {
7107                 $save_as = $file_name;
7108         } elsif ($type =~ m/^text\//) {
7109                 $save_as .= '.txt';
7110         }
7111
7112         # With XSS prevention on, blobs of all types except a few known safe
7113         # ones are served with "Content-Disposition: attachment" to make sure
7114         # they don't run in our security domain.  For certain image types,
7115         # blob view writes an <img> tag referring to blob_plain view, and we
7116         # want to be sure not to break that by serving the image as an
7117         # attachment (though Firefox 3 doesn't seem to care).
7118         my $sandbox = $prevent_xss &&
7119                 $type !~ m!^(?:text/[a-z]+|image/(?:gif|png|jpeg))(?:[ ;]|$)!;
7120
7121         # serve text/* as text/plain
7122         if ($prevent_xss &&
7123             ($type =~ m!^text/[a-z]+\b(.*)$! ||
7124              ($type =~ m!^[a-z]+/[a-z]\+xml\b(.*)$! && -T $fd))) {
7125                 my $rest = $1;
7126                 $rest = defined $rest ? $rest : '';
7127                 $type = "text/plain$rest";
7128         }
7129
7130         print $cgi->header(
7131                 -type => $type,
7132                 -expires => $expires,
7133                 -content_disposition =>
7134                         ($sandbox ? 'attachment' : 'inline')
7135                         . '; filename="' . $save_as . '"');
7136         local $/ = undef;
7137         binmode STDOUT, ':raw';
7138         print <$fd>;
7139         binmode STDOUT, ':utf8'; # as set at the beginning of gitweb.cgi
7140         close $fd;
7141 }
7142
7143 sub git_blob {
7144         my $expires;
7145
7146         if (!defined $hash) {
7147                 if (defined $file_name) {
7148                         my $base = $hash_base || git_get_head_hash($project);
7149                         $hash = git_get_hash_by_path($base, $file_name, "blob")
7150                                 or die_error(404, "Cannot find file");
7151                 } else {
7152                         die_error(400, "No file name defined");
7153                 }
7154         } elsif ($hash =~ m/^[0-9a-fA-F]{40}$/) {
7155                 # blobs defined by non-textual hash id's can be cached
7156                 $expires = "+1d";
7157         }
7158
7159         my $have_blame = gitweb_check_feature('blame');
7160         open my $fd, "-|", git_cmd(), "cat-file", "blob", $hash
7161                 or die_error(500, "Couldn't cat $file_name, $hash");
7162         my $mimetype = blob_mimetype($fd, $file_name);
7163         # use 'blob_plain' (aka 'raw') view for files that cannot be displayed
7164         if ($mimetype !~ m!^(?:text/|image/(?:gif|png|jpeg)$)! && -B $fd) {
7165                 close $fd;
7166                 return git_blob_plain($mimetype);
7167         }
7168         # we can have blame only for text/* mimetype
7169         $have_blame &&= ($mimetype =~ m!^text/!);
7170
7171         my $highlight = gitweb_check_feature('highlight');
7172         my $syntax = guess_file_syntax($highlight, $file_name);
7173         $fd = run_highlighter($fd, $highlight, $syntax);
7174
7175         git_header_html(undef, $expires);
7176         my $formats_nav = '';
7177         if (defined $hash_base && (my %co = parse_commit($hash_base))) {
7178                 if (defined $file_name) {
7179                         if ($have_blame) {
7180                                 $formats_nav .=
7181                                         $cgi->a({-href => href(action=>"blame", -replay=>1)},
7182                                                 "blame") .
7183                                         " | ";
7184                         }
7185                         $formats_nav .=
7186                                 $cgi->a({-href => href(action=>"history", -replay=>1)},
7187                                         "history") .
7188                                 " | " .
7189                                 $cgi->a({-href => href(action=>"blob_plain", -replay=>1)},
7190                                         "raw") .
7191                                 " | " .
7192                                 $cgi->a({-href => href(action=>"blob",
7193                                                        hash_base=>"HEAD", file_name=>$file_name)},
7194                                         "HEAD");
7195                 } else {
7196                         $formats_nav .=
7197                                 $cgi->a({-href => href(action=>"blob_plain", -replay=>1)},
7198                                         "raw");
7199                 }
7200                 git_print_page_nav('','', $hash_base,$co{'tree'},$hash_base, $formats_nav);
7201                 git_print_header_div('commit', esc_html($co{'title'}), $hash_base);
7202         } else {
7203                 print "<div class=\"page_nav\">\n" .
7204                       "<br/><br/></div>\n" .
7205                       "<div class=\"title\">".esc_html($hash)."</div>\n";
7206         }
7207         git_print_page_path($file_name, "blob", $hash_base);
7208         print "<div class=\"page_body\">\n";
7209         if ($mimetype =~ m!^image/!) {
7210                 print qq!<img class="blob" type="!.esc_attr($mimetype).qq!"!;
7211                 if ($file_name) {
7212                         print qq! alt="!.esc_attr($file_name).qq!" title="!.esc_attr($file_name).qq!"!;
7213                 }
7214                 print qq! src="! .
7215                       href(action=>"blob_plain", hash=>$hash,
7216                            hash_base=>$hash_base, file_name=>$file_name) .
7217                       qq!" />\n!;
7218         } else {
7219                 my $nr;
7220                 while (my $line = <$fd>) {
7221                         chomp $line;
7222                         $nr++;
7223                         $line = untabify($line);
7224                         printf qq!<div class="pre"><a id="l%i" href="%s#l%i" class="linenr">%4i</a> %s</div>\n!,
7225                                $nr, esc_attr(href(-replay => 1)), $nr, $nr,
7226                                $highlight ? sanitize($line) : esc_html($line, -nbsp=>1);
7227                 }
7228         }
7229         close $fd
7230                 or print "Reading blob failed.\n";
7231         print "</div>";
7232         git_footer_html();
7233 }
7234
7235 sub git_tree {
7236         if (!defined $hash_base) {
7237                 $hash_base = "HEAD";
7238         }
7239         if (!defined $hash) {
7240                 if (defined $file_name) {
7241                         $hash = git_get_hash_by_path($hash_base, $file_name, "tree");
7242                 } else {
7243                         $hash = $hash_base;
7244                 }
7245         }
7246         die_error(404, "No such tree") unless defined($hash);
7247
7248         my $show_sizes = gitweb_check_feature('show-sizes');
7249         my $have_blame = gitweb_check_feature('blame');
7250
7251         my @entries = ();
7252         {
7253                 local $/ = "\0";
7254                 open my $fd, "-|", git_cmd(), "ls-tree", '-z',
7255                         ($show_sizes ? '-l' : ()), @extra_options, $hash
7256                         or die_error(500, "Open git-ls-tree failed");
7257                 @entries = map { chomp; $_ } <$fd>;
7258                 close $fd
7259                         or die_error(404, "Reading tree failed");
7260         }
7261
7262         my $refs = git_get_references();
7263         my $ref = format_ref_marker($refs, $hash_base);
7264         git_header_html();
7265         my $basedir = '';
7266         if (defined $hash_base && (my %co = parse_commit($hash_base))) {
7267                 my @views_nav = ();
7268                 if (defined $file_name) {
7269                         push @views_nav,
7270                                 $cgi->a({-href => href(action=>"history", -replay=>1)},
7271                                         "history"),
7272                                 $cgi->a({-href => href(action=>"tree",
7273                                                        hash_base=>"HEAD", file_name=>$file_name)},
7274                                         "HEAD"),
7275                 }
7276                 my $snapshot_links = format_snapshot_links($hash);
7277                 if (defined $snapshot_links) {
7278                         # FIXME: Should be available when we have no hash base as well.
7279                         push @views_nav, $snapshot_links;
7280                 }
7281                 git_print_page_nav('tree','', $hash_base, undef, undef,
7282                                    join(' | ', @views_nav));
7283                 git_print_header_div('commit', esc_html($co{'title'}) . $ref, $hash_base);
7284         } else {
7285                 undef $hash_base;
7286                 print "<div class=\"page_nav\">\n";
7287                 print "<br/><br/></div>\n";
7288                 print "<div class=\"title\">".esc_html($hash)."</div>\n";
7289         }
7290         if (defined $file_name) {
7291                 $basedir = $file_name;
7292                 if ($basedir ne '' && substr($basedir, -1) ne '/') {
7293                         $basedir .= '/';
7294                 }
7295                 git_print_page_path($file_name, 'tree', $hash_base);
7296         }
7297         print "<div class=\"page_body\">\n";
7298         print "<table class=\"tree\">\n";
7299         my $alternate = 1;
7300         # '..' (top directory) link if possible
7301         if (defined $hash_base &&
7302             defined $file_name && $file_name =~ m![^/]+$!) {
7303                 if ($alternate) {
7304                         print "<tr class=\"dark\">\n";
7305                 } else {
7306                         print "<tr class=\"light\">\n";
7307                 }
7308                 $alternate ^= 1;
7309
7310                 my $up = $file_name;
7311                 $up =~ s!/?[^/]+$!!;
7312                 undef $up unless $up;
7313                 # based on git_print_tree_entry
7314                 print '<td class="mode">' . mode_str('040000') . "</td>\n";
7315                 print '<td class="size">&nbsp;</td>'."\n" if $show_sizes;
7316                 print '<td class="list">';
7317                 print $cgi->a({-href => href(action=>"tree",
7318                                              hash_base=>$hash_base,
7319                                              file_name=>$up)},
7320                               "..");
7321                 print "</td>\n";
7322                 print "<td class=\"link\"></td>\n";
7323
7324                 print "</tr>\n";
7325         }
7326         foreach my $line (@entries) {
7327                 my %t = parse_ls_tree_line($line, -z => 1, -l => $show_sizes);
7328
7329                 if ($alternate) {
7330                         print "<tr class=\"dark\">\n";
7331                 } else {
7332                         print "<tr class=\"light\">\n";
7333                 }
7334                 $alternate ^= 1;
7335
7336                 git_print_tree_entry(\%t, $basedir, $hash_base, $have_blame);
7337
7338                 print "</tr>\n";
7339         }
7340         print "</table>\n" .
7341               "</div>";
7342         git_footer_html();
7343 }
7344
7345 sub sanitize_for_filename {
7346     my $name = shift;
7347
7348     $name =~ s!/!-!g;
7349     $name =~ s/[^[:alnum:]_.-]//g;
7350
7351     return $name;
7352 }
7353
7354 sub snapshot_name {
7355         my ($project, $hash) = @_;
7356
7357         # path/to/project.git  -> project
7358         # path/to/project/.git -> project
7359         my $name = to_utf8($project);
7360         $name =~ s,([^/])/*\.git$,$1,;
7361         $name = sanitize_for_filename(basename($name));
7362
7363         my $ver = $hash;
7364         if ($hash =~ /^[0-9a-fA-F]+$/) {
7365                 # shorten SHA-1 hash
7366                 my $full_hash = git_get_full_hash($project, $hash);
7367                 if ($full_hash =~ /^$hash/ && length($hash) > 7) {
7368                         $ver = git_get_short_hash($project, $hash);
7369                 }
7370         } elsif ($hash =~ m!^refs/tags/(.*)$!) {
7371                 # tags don't need shortened SHA-1 hash
7372                 $ver = $1;
7373         } else {
7374                 # branches and other need shortened SHA-1 hash
7375                 my $strip_refs = join '|', map { quotemeta } get_branch_refs();
7376                 if ($hash =~ m!^refs/($strip_refs|remotes)/(.*)$!) {
7377                         my $ref_dir = (defined $1) ? $1 : '';
7378                         $ver = $2;
7379
7380                         $ref_dir = sanitize_for_filename($ref_dir);
7381                         # for refs neither in heads nor remotes we want to
7382                         # add a ref dir to archive name
7383                         if ($ref_dir ne '' and $ref_dir ne 'heads' and $ref_dir ne 'remotes') {
7384                                 $ver = $ref_dir . '-' . $ver;
7385                         }
7386                 }
7387                 $ver .= '-' . git_get_short_hash($project, $hash);
7388         }
7389         # special case of sanitization for filename - we change
7390         # slashes to dots instead of dashes
7391         # in case of hierarchical branch names
7392         $ver =~ s!/!.!g;
7393         $ver =~ s/[^[:alnum:]_.-]//g;
7394
7395         # name = project-version_string
7396         $name = "$name-$ver";
7397
7398         return wantarray ? ($name, $name) : $name;
7399 }
7400
7401 sub exit_if_unmodified_since {
7402         my ($latest_epoch) = @_;
7403         our $cgi;
7404
7405         my $if_modified = $cgi->http('IF_MODIFIED_SINCE');
7406         if (defined $if_modified) {
7407                 my $since;
7408                 if (eval { require HTTP::Date; 1; }) {
7409                         $since = HTTP::Date::str2time($if_modified);
7410                 } elsif (eval { require Time::ParseDate; 1; }) {
7411                         $since = Time::ParseDate::parsedate($if_modified, GMT => 1);
7412                 }
7413                 if (defined $since && $latest_epoch <= $since) {
7414                         my %latest_date = parse_date($latest_epoch);
7415                         print $cgi->header(
7416                                 -last_modified => $latest_date{'rfc2822'},
7417                                 -status => '304 Not Modified');
7418                         goto DONE_GITWEB;
7419                 }
7420         }
7421 }
7422
7423 sub git_snapshot {
7424         my $format = $input_params{'snapshot_format'};
7425         if (!@snapshot_fmts) {
7426                 die_error(403, "Snapshots not allowed");
7427         }
7428         # default to first supported snapshot format
7429         $format ||= $snapshot_fmts[0];
7430         if ($format !~ m/^[a-z0-9]+$/) {
7431                 die_error(400, "Invalid snapshot format parameter");
7432         } elsif (!exists($known_snapshot_formats{$format})) {
7433                 die_error(400, "Unknown snapshot format");
7434         } elsif ($known_snapshot_formats{$format}{'disabled'}) {
7435                 die_error(403, "Snapshot format not allowed");
7436         } elsif (!grep($_ eq $format, @snapshot_fmts)) {
7437                 die_error(403, "Unsupported snapshot format");
7438         }
7439
7440         my $type = git_get_type("$hash^{}");
7441         if (!$type) {
7442                 die_error(404, 'Object does not exist');
7443         }  elsif ($type eq 'blob') {
7444                 die_error(400, 'Object is not a tree-ish');
7445         }
7446
7447         my ($name, $prefix) = snapshot_name($project, $hash);
7448         my $filename = "$name$known_snapshot_formats{$format}{'suffix'}";
7449
7450         my %co = parse_commit($hash);
7451         exit_if_unmodified_since($co{'committer_epoch'}) if %co;
7452
7453         my $cmd = quote_command(
7454                 git_cmd(), 'archive',
7455                 "--format=$known_snapshot_formats{$format}{'format'}",
7456                 "--prefix=$prefix/", $hash);
7457         if (exists $known_snapshot_formats{$format}{'compressor'}) {
7458                 $cmd .= ' | ' . quote_command(@{$known_snapshot_formats{$format}{'compressor'}});
7459         }
7460
7461         $filename =~ s/(["\\])/\\$1/g;
7462         my %latest_date;
7463         if (%co) {
7464                 %latest_date = parse_date($co{'committer_epoch'}, $co{'committer_tz'});
7465         }
7466
7467         print $cgi->header(
7468                 -type => $known_snapshot_formats{$format}{'type'},
7469                 -content_disposition => 'inline; filename="' . $filename . '"',
7470                 %co ? (-last_modified => $latest_date{'rfc2822'}) : (),
7471                 -status => '200 OK');
7472
7473         open my $fd, "-|", $cmd
7474                 or die_error(500, "Execute git-archive failed");
7475         binmode STDOUT, ':raw';
7476         print <$fd>;
7477         binmode STDOUT, ':utf8'; # as set at the beginning of gitweb.cgi
7478         close $fd;
7479 }
7480
7481 sub git_log_generic {
7482         my ($fmt_name, $body_subr, $base, $parent, $file_name, $file_hash) = @_;
7483
7484         my $head = git_get_head_hash($project);
7485         if (!defined $base) {
7486                 $base = $head;
7487         }
7488         if (!defined $page) {
7489                 $page = 0;
7490         }
7491         my $refs = git_get_references();
7492
7493         my $commit_hash = $base;
7494         if (defined $parent) {
7495                 $commit_hash = "$parent..$base";
7496         }
7497         my @commitlist =
7498                 parse_commits($commit_hash, 101, (100 * $page),
7499                               defined $file_name ? ($file_name, "--full-history") : ());
7500
7501         my $ftype;
7502         if (!defined $file_hash && defined $file_name) {
7503                 # some commits could have deleted file in question,
7504                 # and not have it in tree, but one of them has to have it
7505                 for (my $i = 0; $i < @commitlist; $i++) {
7506                         $file_hash = git_get_hash_by_path($commitlist[$i]{'id'}, $file_name);
7507                         last if defined $file_hash;
7508                 }
7509         }
7510         if (defined $file_hash) {
7511                 $ftype = git_get_type($file_hash);
7512         }
7513         if (defined $file_name && !defined $ftype) {
7514                 die_error(500, "Unknown type of object");
7515         }
7516         my %co;
7517         if (defined $file_name) {
7518                 %co = parse_commit($base)
7519                         or die_error(404, "Unknown commit object");
7520         }
7521
7522
7523         my $paging_nav = format_paging_nav($fmt_name, $page, $#commitlist >= 100);
7524         my $next_link = '';
7525         if ($#commitlist >= 100) {
7526                 $next_link =
7527                         $cgi->a({-href => href(-replay=>1, page=>$page+1),
7528                                  -accesskey => "n", -title => "Alt-n"}, "next");
7529         }
7530         my $patch_max = gitweb_get_feature('patches');
7531         if ($patch_max && !defined $file_name) {
7532                 if ($patch_max < 0 || @commitlist <= $patch_max) {
7533                         $paging_nav .= " &sdot; " .
7534                                 $cgi->a({-href => href(action=>"patches", -replay=>1)},
7535                                         "patches");
7536                 }
7537         }
7538
7539         git_header_html();
7540         git_print_page_nav($fmt_name,'', $hash,$hash,$hash, $paging_nav);
7541         if (defined $file_name) {
7542                 git_print_header_div('commit', esc_html($co{'title'}), $base);
7543         } else {
7544                 git_print_header_div('summary', $project)
7545         }
7546         git_print_page_path($file_name, $ftype, $hash_base)
7547                 if (defined $file_name);
7548
7549         $body_subr->(\@commitlist, 0, 99, $refs, $next_link,
7550                      $file_name, $file_hash, $ftype);
7551
7552         git_footer_html();
7553 }
7554
7555 sub git_log {
7556         git_log_generic('log', \&git_log_body,
7557                         $hash, $hash_parent);
7558 }
7559
7560 sub git_commit {
7561         $hash ||= $hash_base || "HEAD";
7562         my %co = parse_commit($hash)
7563             or die_error(404, "Unknown commit object");
7564
7565         my $parent  = $co{'parent'};
7566         my $parents = $co{'parents'}; # listref
7567
7568         # we need to prepare $formats_nav before any parameter munging
7569         my $formats_nav;
7570         if (!defined $parent) {
7571                 # --root commitdiff
7572                 $formats_nav .= '(initial)';
7573         } elsif (@$parents == 1) {
7574                 # single parent commit
7575                 $formats_nav .=
7576                         '(parent: ' .
7577                         $cgi->a({-href => href(action=>"commit",
7578                                                hash=>$parent)},
7579                                 esc_html(substr($parent, 0, 7))) .
7580                         ')';
7581         } else {
7582                 # merge commit
7583                 $formats_nav .=
7584                         '(merge: ' .
7585                         join(' ', map {
7586                                 $cgi->a({-href => href(action=>"commit",
7587                                                        hash=>$_)},
7588                                         esc_html(substr($_, 0, 7)));
7589                         } @$parents ) .
7590                         ')';
7591         }
7592         if (gitweb_check_feature('patches') && @$parents <= 1) {
7593                 $formats_nav .= " | " .
7594                         $cgi->a({-href => href(action=>"patch", -replay=>1)},
7595                                 "patch");
7596         }
7597
7598         if (!defined $parent) {
7599                 $parent = "--root";
7600         }
7601         my @difftree;
7602         open my $fd, "-|", git_cmd(), "diff-tree", '-r', "--no-commit-id",
7603                 @diff_opts,
7604                 (@$parents <= 1 ? $parent : '-c'),
7605                 $hash, "--"
7606                 or die_error(500, "Open git-diff-tree failed");
7607         @difftree = map { chomp; $_ } <$fd>;
7608         close $fd or die_error(404, "Reading git-diff-tree failed");
7609
7610         # non-textual hash id's can be cached
7611         my $expires;
7612         if ($hash =~ m/^[0-9a-fA-F]{40}$/) {
7613                 $expires = "+1d";
7614         }
7615         my $refs = git_get_references();
7616         my $ref = format_ref_marker($refs, $co{'id'});
7617
7618         git_header_html(undef, $expires);
7619         git_print_page_nav('commit', '',
7620                            $hash, $co{'tree'}, $hash,
7621                            $formats_nav);
7622
7623         if (defined $co{'parent'}) {
7624                 git_print_header_div('commitdiff', esc_html($co{'title'}) . $ref, $hash);
7625         } else {
7626                 git_print_header_div('tree', esc_html($co{'title'}) . $ref, $co{'tree'}, $hash);
7627         }
7628         print "<div class=\"title_text\">\n" .
7629               "<table class=\"object_header\">\n";
7630         git_print_authorship_rows(\%co);
7631         print "<tr><td>commit</td><td class=\"sha1\">$co{'id'}</td></tr>\n";
7632         print "<tr>" .
7633               "<td>tree</td>" .
7634               "<td class=\"sha1\">" .
7635               $cgi->a({-href => href(action=>"tree", hash=>$co{'tree'}, hash_base=>$hash),
7636                        class => "list"}, $co{'tree'}) .
7637               "</td>" .
7638               "<td class=\"link\">" .
7639               $cgi->a({-href => href(action=>"tree", hash=>$co{'tree'}, hash_base=>$hash)},
7640                       "tree");
7641         my $snapshot_links = format_snapshot_links($hash);
7642         if (defined $snapshot_links) {
7643                 print " | " . $snapshot_links;
7644         }
7645         print "</td>" .
7646               "</tr>\n";
7647
7648         foreach my $par (@$parents) {
7649                 print "<tr>" .
7650                       "<td>parent</td>" .
7651                       "<td class=\"sha1\">" .
7652                       $cgi->a({-href => href(action=>"commit", hash=>$par),
7653                                class => "list"}, $par) .
7654                       "</td>" .
7655                       "<td class=\"link\">" .
7656                       $cgi->a({-href => href(action=>"commit", hash=>$par)}, "commit") .
7657                       " | " .
7658                       $cgi->a({-href => href(action=>"commitdiff", hash=>$hash, hash_parent=>$par)}, "diff") .
7659                       "</td>" .
7660                       "</tr>\n";
7661         }
7662         print "</table>".
7663               "</div>\n";
7664
7665         print "<div class=\"page_body\">\n";
7666         git_print_log($co{'comment'});
7667         print "</div>\n";
7668
7669         git_difftree_body(\@difftree, $hash, @$parents);
7670
7671         git_footer_html();
7672 }
7673
7674 sub git_object {
7675         # object is defined by:
7676         # - hash or hash_base alone
7677         # - hash_base and file_name
7678         my $type;
7679
7680         # - hash or hash_base alone
7681         if ($hash || ($hash_base && !defined $file_name)) {
7682                 my $object_id = $hash || $hash_base;
7683
7684                 open my $fd, "-|", quote_command(
7685                         git_cmd(), 'cat-file', '-t', $object_id) . ' 2> /dev/null'
7686                         or die_error(404, "Object does not exist");
7687                 $type = <$fd>;
7688                 defined $type && chomp $type;
7689                 close $fd
7690                         or die_error(404, "Object does not exist");
7691
7692         # - hash_base and file_name
7693         } elsif ($hash_base && defined $file_name) {
7694                 $file_name =~ s,/+$,,;
7695
7696                 system(git_cmd(), "cat-file", '-e', $hash_base) == 0
7697                         or die_error(404, "Base object does not exist");
7698
7699                 # here errors should not happen
7700                 open my $fd, "-|", git_cmd(), "ls-tree", $hash_base, "--", $file_name
7701                         or die_error(500, "Open git-ls-tree failed");
7702                 my $line = <$fd>;
7703                 close $fd;
7704
7705                 #'100644 blob 0fa3f3a66fb6a137f6ec2c19351ed4d807070ffa  panic.c'
7706                 unless ($line && $line =~ m/^([0-9]+) (.+) ([0-9a-fA-F]{40})\t/) {
7707                         die_error(404, "File or directory for given base does not exist");
7708                 }
7709                 $type = $2;
7710                 $hash = $3;
7711         } else {
7712                 die_error(400, "Not enough information to find object");
7713         }
7714
7715         print $cgi->redirect(-uri => href(action=>$type, -full=>1,
7716                                           hash=>$hash, hash_base=>$hash_base,
7717                                           file_name=>$file_name),
7718                              -status => '302 Found');
7719 }
7720
7721 sub git_blobdiff {
7722         my $format = shift || 'html';
7723         my $diff_style = $input_params{'diff_style'} || 'inline';
7724
7725         my $fd;
7726         my @difftree;
7727         my %diffinfo;
7728         my $expires;
7729
7730         # preparing $fd and %diffinfo for git_patchset_body
7731         # new style URI
7732         if (defined $hash_base && defined $hash_parent_base) {
7733                 if (defined $file_name) {
7734                         # read raw output
7735                         open $fd, "-|", git_cmd(), "diff-tree", '-r', @diff_opts,
7736                                 $hash_parent_base, $hash_base,
7737                                 "--", (defined $file_parent ? $file_parent : ()), $file_name
7738                                 or die_error(500, "Open git-diff-tree failed");
7739                         @difftree = map { chomp; $_ } <$fd>;
7740                         close $fd
7741                                 or die_error(404, "Reading git-diff-tree failed");
7742                         @difftree
7743                                 or die_error(404, "Blob diff not found");
7744
7745                 } elsif (defined $hash &&
7746                          $hash =~ /[0-9a-fA-F]{40}/) {
7747                         # try to find filename from $hash
7748
7749                         # read filtered raw output
7750                         open $fd, "-|", git_cmd(), "diff-tree", '-r', @diff_opts,
7751                                 $hash_parent_base, $hash_base, "--"
7752                                 or die_error(500, "Open git-diff-tree failed");
7753                         @difftree =
7754                                 # ':100644 100644 03b21826... 3b93d5e7... M     ls-files.c'
7755                                 # $hash == to_id
7756                                 grep { /^:[0-7]{6} [0-7]{6} [0-9a-fA-F]{40} $hash/ }
7757                                 map { chomp; $_ } <$fd>;
7758                         close $fd
7759                                 or die_error(404, "Reading git-diff-tree failed");
7760                         @difftree
7761                                 or die_error(404, "Blob diff not found");
7762
7763                 } else {
7764                         die_error(400, "Missing one of the blob diff parameters");
7765                 }
7766
7767                 if (@difftree > 1) {
7768                         die_error(400, "Ambiguous blob diff specification");
7769                 }
7770
7771                 %diffinfo = parse_difftree_raw_line($difftree[0]);
7772                 $file_parent ||= $diffinfo{'from_file'} || $file_name;
7773                 $file_name   ||= $diffinfo{'to_file'};
7774
7775                 $hash_parent ||= $diffinfo{'from_id'};
7776                 $hash        ||= $diffinfo{'to_id'};
7777
7778                 # non-textual hash id's can be cached
7779                 if ($hash_base =~ m/^[0-9a-fA-F]{40}$/ &&
7780                     $hash_parent_base =~ m/^[0-9a-fA-F]{40}$/) {
7781                         $expires = '+1d';
7782                 }
7783
7784                 # open patch output
7785                 open $fd, "-|", git_cmd(), "diff-tree", '-r', @diff_opts,
7786                         '-p', ($format eq 'html' ? "--full-index" : ()),
7787                         $hash_parent_base, $hash_base,
7788                         "--", (defined $file_parent ? $file_parent : ()), $file_name
7789                         or die_error(500, "Open git-diff-tree failed");
7790         }
7791
7792         # old/legacy style URI -- not generated anymore since 1.4.3.
7793         if (!%diffinfo) {
7794                 die_error('404 Not Found', "Missing one of the blob diff parameters")
7795         }
7796
7797         # header
7798         if ($format eq 'html') {
7799                 my $formats_nav =
7800                         $cgi->a({-href => href(action=>"blobdiff_plain", -replay=>1)},
7801                                 "raw");
7802                 $formats_nav .= diff_style_nav($diff_style);
7803                 git_header_html(undef, $expires);
7804                 if (defined $hash_base && (my %co = parse_commit($hash_base))) {
7805                         git_print_page_nav('','', $hash_base,$co{'tree'},$hash_base, $formats_nav);
7806                         git_print_header_div('commit', esc_html($co{'title'}), $hash_base);
7807                 } else {
7808                         print "<div class=\"page_nav\"><br/>$formats_nav<br/></div>\n";
7809                         print "<div class=\"title\">".esc_html("$hash vs $hash_parent")."</div>\n";
7810                 }
7811                 if (defined $file_name) {
7812                         git_print_page_path($file_name, "blob", $hash_base);
7813                 } else {
7814                         print "<div class=\"page_path\"></div>\n";
7815                 }
7816
7817         } elsif ($format eq 'plain') {
7818                 print $cgi->header(
7819                         -type => 'text/plain',
7820                         -charset => 'utf-8',
7821                         -expires => $expires,
7822                         -content_disposition => 'inline; filename="' . "$file_name" . '.patch"');
7823
7824                 print "X-Git-Url: " . $cgi->self_url() . "\n\n";
7825
7826         } else {
7827                 die_error(400, "Unknown blobdiff format");
7828         }
7829
7830         # patch
7831         if ($format eq 'html') {
7832                 print "<div class=\"page_body\">\n";
7833
7834                 git_patchset_body($fd, $diff_style,
7835                                   [ \%diffinfo ], $hash_base, $hash_parent_base);
7836                 close $fd;
7837
7838                 print "</div>\n"; # class="page_body"
7839                 git_footer_html();
7840
7841         } else {
7842                 while (my $line = <$fd>) {
7843                         $line =~ s!a/($hash|$hash_parent)!'a/'.esc_path($diffinfo{'from_file'})!eg;
7844                         $line =~ s!b/($hash|$hash_parent)!'b/'.esc_path($diffinfo{'to_file'})!eg;
7845
7846                         print $line;
7847
7848                         last if $line =~ m!^\+\+\+!;
7849                 }
7850                 local $/ = undef;
7851                 print <$fd>;
7852                 close $fd;
7853         }
7854 }
7855
7856 sub git_blobdiff_plain {
7857         git_blobdiff('plain');
7858 }
7859
7860 # assumes that it is added as later part of already existing navigation,
7861 # so it returns "| foo | bar" rather than just "foo | bar"
7862 sub diff_style_nav {
7863         my ($diff_style, $is_combined) = @_;
7864         $diff_style ||= 'inline';
7865
7866         return "" if ($is_combined);
7867
7868         my @styles = (inline => 'inline', 'sidebyside' => 'side by side');
7869         my %styles = @styles;
7870         @styles =
7871                 @styles[ map { $_ * 2 } 0..$#styles/2 ];
7872
7873         return join '',
7874                 map { " | ".$_ }
7875                 map {
7876                         $_ eq $diff_style ? $styles{$_} :
7877                         $cgi->a({-href => href(-replay=>1, diff_style => $_)}, $styles{$_})
7878                 } @styles;
7879 }
7880
7881 sub git_commitdiff {
7882         my %params = @_;
7883         my $format = $params{-format} || 'html';
7884         my $diff_style = $input_params{'diff_style'} || 'inline';
7885
7886         my ($patch_max) = gitweb_get_feature('patches');
7887         if ($format eq 'patch') {
7888                 die_error(403, "Patch view not allowed") unless $patch_max;
7889         }
7890
7891         $hash ||= $hash_base || "HEAD";
7892         my %co = parse_commit($hash)
7893             or die_error(404, "Unknown commit object");
7894
7895         # choose format for commitdiff for merge
7896         if (! defined $hash_parent && @{$co{'parents'}} > 1) {
7897                 $hash_parent = '--cc';
7898         }
7899         # we need to prepare $formats_nav before almost any parameter munging
7900         my $formats_nav;
7901         if ($format eq 'html') {
7902                 $formats_nav =
7903                         $cgi->a({-href => href(action=>"commitdiff_plain", -replay=>1)},
7904                                 "raw");
7905                 if ($patch_max && @{$co{'parents'}} <= 1) {
7906                         $formats_nav .= " | " .
7907                                 $cgi->a({-href => href(action=>"patch", -replay=>1)},
7908                                         "patch");
7909                 }
7910                 $formats_nav .= diff_style_nav($diff_style, @{$co{'parents'}} > 1);
7911
7912                 if (defined $hash_parent &&
7913                     $hash_parent ne '-c' && $hash_parent ne '--cc') {
7914                         # commitdiff with two commits given
7915                         my $hash_parent_short = $hash_parent;
7916                         if ($hash_parent =~ m/^[0-9a-fA-F]{40}$/) {
7917                                 $hash_parent_short = substr($hash_parent, 0, 7);
7918                         }
7919                         $formats_nav .=
7920                                 ' (from';
7921                         for (my $i = 0; $i < @{$co{'parents'}}; $i++) {
7922                                 if ($co{'parents'}[$i] eq $hash_parent) {
7923                                         $formats_nav .= ' parent ' . ($i+1);
7924                                         last;
7925                                 }
7926                         }
7927                         $formats_nav .= ': ' .
7928                                 $cgi->a({-href => href(-replay=>1,
7929                                                        hash=>$hash_parent, hash_base=>undef)},
7930                                         esc_html($hash_parent_short)) .
7931                                 ')';
7932                 } elsif (!$co{'parent'}) {
7933                         # --root commitdiff
7934                         $formats_nav .= ' (initial)';
7935                 } elsif (scalar @{$co{'parents'}} == 1) {
7936                         # single parent commit
7937                         $formats_nav .=
7938                                 ' (parent: ' .
7939                                 $cgi->a({-href => href(-replay=>1,
7940                                                        hash=>$co{'parent'}, hash_base=>undef)},
7941                                         esc_html(substr($co{'parent'}, 0, 7))) .
7942                                 ')';
7943                 } else {
7944                         # merge commit
7945                         if ($hash_parent eq '--cc') {
7946                                 $formats_nav .= ' | ' .
7947                                         $cgi->a({-href => href(-replay=>1,
7948                                                                hash=>$hash, hash_parent=>'-c')},
7949                                                 'combined');
7950                         } else { # $hash_parent eq '-c'
7951                                 $formats_nav .= ' | ' .
7952                                         $cgi->a({-href => href(-replay=>1,
7953                                                                hash=>$hash, hash_parent=>'--cc')},
7954                                                 'compact');
7955                         }
7956                         $formats_nav .=
7957                                 ' (merge: ' .
7958                                 join(' ', map {
7959                                         $cgi->a({-href => href(-replay=>1,
7960                                                                hash=>$_, hash_base=>undef)},
7961                                                 esc_html(substr($_, 0, 7)));
7962                                 } @{$co{'parents'}} ) .
7963                                 ')';
7964                 }
7965         }
7966
7967         my $hash_parent_param = $hash_parent;
7968         if (!defined $hash_parent_param) {
7969                 # --cc for multiple parents, --root for parentless
7970                 $hash_parent_param =
7971                         @{$co{'parents'}} > 1 ? '--cc' : $co{'parent'} || '--root';
7972         }
7973
7974         # read commitdiff
7975         my $fd;
7976         my @difftree;
7977         if ($format eq 'html') {
7978                 open $fd, "-|", git_cmd(), "diff-tree", '-r', @diff_opts,
7979                         "--no-commit-id", "--patch-with-raw", "--full-index",
7980                         $hash_parent_param, $hash, "--"
7981                         or die_error(500, "Open git-diff-tree failed");
7982
7983                 while (my $line = <$fd>) {
7984                         chomp $line;
7985                         # empty line ends raw part of diff-tree output
7986                         last unless $line;
7987                         push @difftree, scalar parse_difftree_raw_line($line);
7988                 }
7989
7990         } elsif ($format eq 'plain') {
7991                 open $fd, "-|", git_cmd(), "diff-tree", '-r', @diff_opts,
7992                         '-p', $hash_parent_param, $hash, "--"
7993                         or die_error(500, "Open git-diff-tree failed");
7994         } elsif ($format eq 'patch') {
7995                 # For commit ranges, we limit the output to the number of
7996                 # patches specified in the 'patches' feature.
7997                 # For single commits, we limit the output to a single patch,
7998                 # diverging from the git-format-patch default.
7999                 my @commit_spec = ();
8000                 if ($hash_parent) {
8001                         if ($patch_max > 0) {
8002                                 push @commit_spec, "-$patch_max";
8003                         }
8004                         push @commit_spec, '-n', "$hash_parent..$hash";
8005                 } else {
8006                         if ($params{-single}) {
8007                                 push @commit_spec, '-1';
8008                         } else {
8009                                 if ($patch_max > 0) {
8010                                         push @commit_spec, "-$patch_max";
8011                                 }
8012                                 push @commit_spec, "-n";
8013                         }
8014                         push @commit_spec, '--root', $hash;
8015                 }
8016                 open $fd, "-|", git_cmd(), "format-patch", @diff_opts,
8017                         '--encoding=utf8', '--stdout', @commit_spec
8018                         or die_error(500, "Open git-format-patch failed");
8019         } else {
8020                 die_error(400, "Unknown commitdiff format");
8021         }
8022
8023         # non-textual hash id's can be cached
8024         my $expires;
8025         if ($hash =~ m/^[0-9a-fA-F]{40}$/) {
8026                 $expires = "+1d";
8027         }
8028
8029         # write commit message
8030         if ($format eq 'html') {
8031                 my $refs = git_get_references();
8032                 my $ref = format_ref_marker($refs, $co{'id'});
8033
8034                 git_header_html(undef, $expires);
8035                 git_print_page_nav('commitdiff','', $hash,$co{'tree'},$hash, $formats_nav);
8036                 git_print_header_div('commit', esc_html($co{'title'}) . $ref, $hash);
8037                 print "<div class=\"title_text\">\n" .
8038                       "<table class=\"object_header\">\n";
8039                 git_print_authorship_rows(\%co);
8040                 print "</table>".
8041                       "</div>\n";
8042                 print "<div class=\"page_body\">\n";
8043                 if (@{$co{'comment'}} > 1) {
8044                         print "<div class=\"log\">\n";
8045                         git_print_log($co{'comment'}, -final_empty_line=> 1, -remove_title => 1);
8046                         print "</div>\n"; # class="log"
8047                 }
8048
8049         } elsif ($format eq 'plain') {
8050                 my $refs = git_get_references("tags");
8051                 my $tagname = git_get_rev_name_tags($hash);
8052                 my $filename = basename($project) . "-$hash.patch";
8053
8054                 print $cgi->header(
8055                         -type => 'text/plain',
8056                         -charset => 'utf-8',
8057                         -expires => $expires,
8058                         -content_disposition => 'inline; filename="' . "$filename" . '"');
8059                 my %ad = parse_date($co{'author_epoch'}, $co{'author_tz'});
8060                 print "From: " . to_utf8($co{'author'}) . "\n";
8061                 print "Date: $ad{'rfc2822'} ($ad{'tz_local'})\n";
8062                 print "Subject: " . to_utf8($co{'title'}) . "\n";
8063
8064                 print "X-Git-Tag: $tagname\n" if $tagname;
8065                 print "X-Git-Url: " . $cgi->self_url() . "\n\n";
8066
8067                 foreach my $line (@{$co{'comment'}}) {
8068                         print to_utf8($line) . "\n";
8069                 }
8070                 print "---\n\n";
8071         } elsif ($format eq 'patch') {
8072                 my $filename = basename($project) . "-$hash.patch";
8073
8074                 print $cgi->header(
8075                         -type => 'text/plain',
8076                         -charset => 'utf-8',
8077                         -expires => $expires,
8078                         -content_disposition => 'inline; filename="' . "$filename" . '"');
8079         }
8080
8081         # write patch
8082         if ($format eq 'html') {
8083                 my $use_parents = !defined $hash_parent ||
8084                         $hash_parent eq '-c' || $hash_parent eq '--cc';
8085                 git_difftree_body(\@difftree, $hash,
8086                                   $use_parents ? @{$co{'parents'}} : $hash_parent);
8087                 print "<br/>\n";
8088
8089                 git_patchset_body($fd, $diff_style,
8090                                   \@difftree, $hash,
8091                                   $use_parents ? @{$co{'parents'}} : $hash_parent);
8092                 close $fd;
8093                 print "</div>\n"; # class="page_body"
8094                 git_footer_html();
8095
8096         } elsif ($format eq 'plain') {
8097                 local $/ = undef;
8098                 print <$fd>;
8099                 close $fd
8100                         or print "Reading git-diff-tree failed\n";
8101         } elsif ($format eq 'patch') {
8102                 local $/ = undef;
8103                 print <$fd>;
8104                 close $fd
8105                         or print "Reading git-format-patch failed\n";
8106         }
8107 }
8108
8109 sub git_commitdiff_plain {
8110         git_commitdiff(-format => 'plain');
8111 }
8112
8113 # format-patch-style patches
8114 sub git_patch {
8115         git_commitdiff(-format => 'patch', -single => 1);
8116 }
8117
8118 sub git_patches {
8119         git_commitdiff(-format => 'patch');
8120 }
8121
8122 sub git_history {
8123         git_log_generic('history', \&git_history_body,
8124                         $hash_base, $hash_parent_base,
8125                         $file_name, $hash);
8126 }
8127
8128 sub git_search {
8129         $searchtype ||= 'commit';
8130
8131         # check if appropriate features are enabled
8132         gitweb_check_feature('search')
8133                 or die_error(403, "Search is disabled");
8134         if ($searchtype eq 'pickaxe') {
8135                 # pickaxe may take all resources of your box and run for several minutes
8136                 # with every query - so decide by yourself how public you make this feature
8137                 gitweb_check_feature('pickaxe')
8138                         or die_error(403, "Pickaxe search is disabled");
8139         }
8140         if ($searchtype eq 'grep') {
8141                 # grep search might be potentially CPU-intensive, too
8142                 gitweb_check_feature('grep')
8143                         or die_error(403, "Grep search is disabled");
8144         }
8145
8146         if (!defined $searchtext) {
8147                 die_error(400, "Text field is empty");
8148         }
8149         if (!defined $hash) {
8150                 $hash = git_get_head_hash($project);
8151         }
8152         my %co = parse_commit($hash);
8153         if (!%co) {
8154                 die_error(404, "Unknown commit object");
8155         }
8156         if (!defined $page) {
8157                 $page = 0;
8158         }
8159
8160         if ($searchtype eq 'commit' ||
8161             $searchtype eq 'author' ||
8162             $searchtype eq 'committer') {
8163                 git_search_message(%co);
8164         } elsif ($searchtype eq 'pickaxe') {
8165                 git_search_changes(%co);
8166         } elsif ($searchtype eq 'grep') {
8167                 git_search_files(%co);
8168         } else {
8169                 die_error(400, "Unknown search type");
8170         }
8171 }
8172
8173 sub git_search_help {
8174         git_header_html();
8175         git_print_page_nav('','', $hash,$hash,$hash);
8176         print <<EOT;
8177 <p><strong>Pattern</strong> is by default a normal string that is matched precisely (but without
8178 regard to case, except in the case of pickaxe). However, when you check the <em>re</em> checkbox,
8179 the pattern entered is recognized as the POSIX extended
8180 <a href="http://en.wikipedia.org/wiki/Regular_expression">regular expression</a> (also case
8181 insensitive).</p>
8182 <dl>
8183 <dt><b>commit</b></dt>
8184 <dd>The commit messages and authorship information will be scanned for the given pattern.</dd>
8185 EOT
8186         my $have_grep = gitweb_check_feature('grep');
8187         if ($have_grep) {
8188                 print <<EOT;
8189 <dt><b>grep</b></dt>
8190 <dd>All files in the currently selected tree (HEAD unless you are explicitly browsing
8191     a different one) are searched for the given pattern. On large trees, this search can take
8192 a while and put some strain on the server, so please use it with some consideration. Note that
8193 due to git-grep peculiarity, currently if regexp mode is turned off, the matches are
8194 case-sensitive.</dd>
8195 EOT
8196         }
8197         print <<EOT;
8198 <dt><b>author</b></dt>
8199 <dd>Name and e-mail of the change author and date of birth of the patch will be scanned for the given pattern.</dd>
8200 <dt><b>committer</b></dt>
8201 <dd>Name and e-mail of the committer and date of commit will be scanned for the given pattern.</dd>
8202 EOT
8203         my $have_pickaxe = gitweb_check_feature('pickaxe');
8204         if ($have_pickaxe) {
8205                 print <<EOT;
8206 <dt><b>pickaxe</b></dt>
8207 <dd>All commits that caused the string to appear or disappear from any file (changes that
8208 added, removed or "modified" the string) will be listed. This search can take a while and
8209 takes a lot of strain on the server, so please use it wisely. Note that since you may be
8210 interested even in changes just changing the case as well, this search is case sensitive.</dd>
8211 EOT
8212         }
8213         print "</dl>\n";
8214         git_footer_html();
8215 }
8216
8217 sub git_shortlog {
8218         git_log_generic('shortlog', \&git_shortlog_body,
8219                         $hash, $hash_parent);
8220 }
8221
8222 ## ......................................................................
8223 ## feeds (RSS, Atom; OPML)
8224
8225 sub git_feed {
8226         my $format = shift || 'atom';
8227         my $have_blame = gitweb_check_feature('blame');
8228
8229         # Atom: http://www.atomenabled.org/developers/syndication/
8230         # RSS:  http://www.notestips.com/80256B3A007F2692/1/NAMO5P9UPQ
8231         if ($format ne 'rss' && $format ne 'atom') {
8232                 die_error(400, "Unknown web feed format");
8233         }
8234
8235         # log/feed of current (HEAD) branch, log of given branch, history of file/directory
8236         my $head = $hash || 'HEAD';
8237         my @commitlist = parse_commits($head, 150, 0, $file_name);
8238
8239         my %latest_commit;
8240         my %latest_date;
8241         my $content_type = "application/$format+xml";
8242         if (defined $cgi->http('HTTP_ACCEPT') &&
8243                  $cgi->Accept('text/xml') > $cgi->Accept($content_type)) {
8244                 # browser (feed reader) prefers text/xml
8245                 $content_type = 'text/xml';
8246         }
8247         if (defined($commitlist[0])) {
8248                 %latest_commit = %{$commitlist[0]};
8249                 my $latest_epoch = $latest_commit{'committer_epoch'};
8250                 exit_if_unmodified_since($latest_epoch);
8251                 %latest_date = parse_date($latest_epoch, $latest_commit{'committer_tz'});
8252         }
8253         print $cgi->header(
8254                 -type => $content_type,
8255                 -charset => 'utf-8',
8256                 %latest_date ? (-last_modified => $latest_date{'rfc2822'}) : (),
8257                 -status => '200 OK');
8258
8259         # Optimization: skip generating the body if client asks only
8260         # for Last-Modified date.
8261         return if ($cgi->request_method() eq 'HEAD');
8262
8263         # header variables
8264         my $title = "$site_name - $project/$action";
8265         my $feed_type = 'log';
8266         if (defined $hash) {
8267                 $title .= " - '$hash'";
8268                 $feed_type = 'branch log';
8269                 if (defined $file_name) {
8270                         $title .= " :: $file_name";
8271                         $feed_type = 'history';
8272                 }
8273         } elsif (defined $file_name) {
8274                 $title .= " - $file_name";
8275                 $feed_type = 'history';
8276         }
8277         $title .= " $feed_type";
8278         $title = esc_html($title);
8279         my $descr = git_get_project_description($project);
8280         if (defined $descr) {
8281                 $descr = esc_html($descr);
8282         } else {
8283                 $descr = "$project " .
8284                          ($format eq 'rss' ? 'RSS' : 'Atom') .
8285                          " feed";
8286         }
8287         my $owner = git_get_project_owner($project);
8288         $owner = esc_html($owner);
8289
8290         #header
8291         my $alt_url;
8292         if (defined $file_name) {
8293                 $alt_url = href(-full=>1, action=>"history", hash=>$hash, file_name=>$file_name);
8294         } elsif (defined $hash) {
8295                 $alt_url = href(-full=>1, action=>"log", hash=>$hash);
8296         } else {
8297                 $alt_url = href(-full=>1, action=>"summary");
8298         }
8299         print qq!<?xml version="1.0" encoding="utf-8"?>\n!;
8300         if ($format eq 'rss') {
8301                 print <<XML;
8302 <rss version="2.0" xmlns:content="http://purl.org/rss/1.0/modules/content/">
8303 <channel>
8304 XML
8305                 print "<title>$title</title>\n" .
8306                       "<link>$alt_url</link>\n" .
8307                       "<description>$descr</description>\n" .
8308                       "<language>en</language>\n" .
8309                       # project owner is responsible for 'editorial' content
8310                       "<managingEditor>$owner</managingEditor>\n";
8311                 if (defined $logo || defined $favicon) {
8312                         # prefer the logo to the favicon, since RSS
8313                         # doesn't allow both
8314                         my $img = esc_url($logo || $favicon);
8315                         print "<image>\n" .
8316                               "<url>$img</url>\n" .
8317                               "<title>$title</title>\n" .
8318                               "<link>$alt_url</link>\n" .
8319                               "</image>\n";
8320                 }
8321                 if (%latest_date) {
8322                         print "<pubDate>$latest_date{'rfc2822'}</pubDate>\n";
8323                         print "<lastBuildDate>$latest_date{'rfc2822'}</lastBuildDate>\n";
8324                 }
8325                 print "<generator>gitweb v.$version/$git_version</generator>\n";
8326         } elsif ($format eq 'atom') {
8327                 print <<XML;
8328 <feed xmlns="http://www.w3.org/2005/Atom">
8329 XML
8330                 print "<title>$title</title>\n" .
8331                       "<subtitle>$descr</subtitle>\n" .
8332                       '<link rel="alternate" type="text/html" href="' .
8333                       $alt_url . '" />' . "\n" .
8334                       '<link rel="self" type="' . $content_type . '" href="' .
8335                       $cgi->self_url() . '" />' . "\n" .
8336                       "<id>" . href(-full=>1) . "</id>\n" .
8337                       # use project owner for feed author
8338                       '<author><name>'. email_obfuscate($owner) . '</name></author>\n';
8339                 if (defined $favicon) {
8340                         print "<icon>" . esc_url($favicon) . "</icon>\n";
8341                 }
8342                 if (defined $logo) {
8343                         # not twice as wide as tall: 72 x 27 pixels
8344                         print "<logo>" . esc_url($logo) . "</logo>\n";
8345                 }
8346                 if (! %latest_date) {
8347                         # dummy date to keep the feed valid until commits trickle in:
8348                         print "<updated>1970-01-01T00:00:00Z</updated>\n";
8349                 } else {
8350                         print "<updated>$latest_date{'iso-8601'}</updated>\n";
8351                 }
8352                 print "<generator version='$version/$git_version'>gitweb</generator>\n";
8353         }
8354
8355         # contents
8356         for (my $i = 0; $i <= $#commitlist; $i++) {
8357                 my %co = %{$commitlist[$i]};
8358                 my $commit = $co{'id'};
8359                 # we read 150, we always show 30 and the ones more recent than 48 hours
8360                 if (($i >= 20) && ((time - $co{'author_epoch'}) > 48*60*60)) {
8361                         last;
8362                 }
8363                 my %cd = parse_date($co{'author_epoch'}, $co{'author_tz'});
8364
8365                 # get list of changed files
8366                 open my $fd, "-|", git_cmd(), "diff-tree", '-r', @diff_opts,
8367                         $co{'parent'} || "--root",
8368                         $co{'id'}, "--", (defined $file_name ? $file_name : ())
8369                         or next;
8370                 my @difftree = map { chomp; $_ } <$fd>;
8371                 close $fd
8372                         or next;
8373
8374                 # print element (entry, item)
8375                 my $co_url = href(-full=>1, action=>"commitdiff", hash=>$commit);
8376                 if ($format eq 'rss') {
8377                         print "<item>\n" .
8378                               "<title>" . esc_html($co{'title'}) . "</title>\n" .
8379                               "<author>" . esc_html($co{'author'}) . "</author>\n" .
8380                               "<pubDate>$cd{'rfc2822'}</pubDate>\n" .
8381                               "<guid isPermaLink=\"true\">$co_url</guid>\n" .
8382                               "<link>$co_url</link>\n" .
8383                               "<description>" . esc_html($co{'title'}) . "</description>\n" .
8384                               "<content:encoded>" .
8385                               "<![CDATA[\n";
8386                 } elsif ($format eq 'atom') {
8387                         print "<entry>\n" .
8388                               "<title type=\"html\">" . esc_html($co{'title'}) . "</title>\n" .
8389                               "<updated>$cd{'iso-8601'}</updated>\n" .
8390                               "<author>\n" .
8391                               "  <name>" . esc_html($co{'author_name'}) . "</name>\n";
8392                         if ($co{'author_email'}) {
8393                                 print "  <email>" . esc_html($co{'author_email'}) . "</email>\n";
8394                         }
8395                         print "</author>\n" .
8396                               # use committer for contributor
8397                               "<contributor>\n" .
8398                               "  <name>" . esc_html($co{'committer_name'}) . "</name>\n";
8399                         if ($co{'committer_email'}) {
8400                                 print "  <email>" . esc_html($co{'committer_email'}) . "</email>\n";
8401                         }
8402                         print "</contributor>\n" .
8403                               "<published>$cd{'iso-8601'}</published>\n" .
8404                               "<link rel=\"alternate\" type=\"text/html\" href=\"$co_url\" />\n" .
8405                               "<id>$co_url</id>\n" .
8406                               "<content type=\"xhtml\" xml:base=\"" . esc_url($my_url) . "\">\n" .
8407                               "<div xmlns=\"http://www.w3.org/1999/xhtml\">\n";
8408                 }
8409                 my $comment = $co{'comment'};
8410                 print "<pre>\n";
8411                 foreach my $line (@$comment) {
8412                         $line = esc_html($line);
8413                         print "$line\n";
8414                 }
8415                 print "</pre><ul>\n";
8416                 foreach my $difftree_line (@difftree) {
8417                         my %difftree = parse_difftree_raw_line($difftree_line);
8418                         next if !$difftree{'from_id'};
8419
8420                         my $file = $difftree{'file'} || $difftree{'to_file'};
8421
8422                         print "<li>" .
8423                               "[" .
8424                               $cgi->a({-href => href(-full=>1, action=>"blobdiff",
8425                                                      hash=>$difftree{'to_id'}, hash_parent=>$difftree{'from_id'},
8426                                                      hash_base=>$co{'id'}, hash_parent_base=>$co{'parent'},
8427                                                      file_name=>$file, file_parent=>$difftree{'from_file'}),
8428                                       -title => "diff"}, 'D');
8429                         if ($have_blame) {
8430                                 print $cgi->a({-href => href(-full=>1, action=>"blame",
8431                                                              file_name=>$file, hash_base=>$commit),
8432                                               -title => "blame"}, 'B');
8433                         }
8434                         # if this is not a feed of a file history
8435                         if (!defined $file_name || $file_name ne $file) {
8436                                 print $cgi->a({-href => href(-full=>1, action=>"history",
8437                                                              file_name=>$file, hash=>$commit),
8438                                               -title => "history"}, 'H');
8439                         }
8440                         $file = esc_path($file);
8441                         print "] ".
8442                               "$file</li>\n";
8443                 }
8444                 if ($format eq 'rss') {
8445                         print "</ul>]]>\n" .
8446                               "</content:encoded>\n" .
8447                               "</item>\n";
8448                 } elsif ($format eq 'atom') {
8449                         print "</ul>\n</div>\n" .
8450                               "</content>\n" .
8451                               "</entry>\n";
8452                 }
8453         }
8454
8455         # end of feed
8456         if ($format eq 'rss') {
8457                 print "</channel>\n</rss>\n";
8458         } elsif ($format eq 'atom') {
8459                 print "</feed>\n";
8460         }
8461 }
8462
8463 sub git_rss {
8464         git_feed('rss');
8465 }
8466
8467 sub git_atom {
8468         git_feed('atom');
8469 }
8470
8471 sub git_opml {
8472         my @list = git_get_projects_list($project_filter, $strict_export);
8473         if (!@list) {
8474                 die_error(404, "No projects found");
8475         }
8476
8477         print $cgi->header(
8478                 -type => 'text/xml',
8479                 -charset => 'utf-8',
8480                 -content_disposition => 'inline; filename="opml.xml"');
8481
8482         my $title = esc_html($site_name);
8483         my $filter = " within subdirectory ";
8484         if (defined $project_filter) {
8485                 $filter .= esc_html($project_filter);
8486         } else {
8487                 $filter = "";
8488         }
8489         print <<XML;
8490 <?xml version="1.0" encoding="utf-8"?>
8491 <opml version="1.0">
8492 <head>
8493   <title>$title OPML Export$filter</title>
8494 </head>
8495 <body>
8496 <outline text="git RSS feeds">
8497 XML
8498
8499         foreach my $pr (@list) {
8500                 my %proj = %$pr;
8501                 my $head = git_get_head_hash($proj{'path'});
8502                 if (!defined $head) {
8503                         next;
8504                 }
8505                 $git_dir = "$projectroot/$proj{'path'}";
8506                 my %co = parse_commit($head);
8507                 if (!%co) {
8508                         next;
8509                 }
8510
8511                 my $path = esc_html(chop_str($proj{'path'}, 25, 5));
8512                 my $rss  = href('project' => $proj{'path'}, 'action' => 'rss', -full => 1);
8513                 my $html = href('project' => $proj{'path'}, 'action' => 'summary', -full => 1);
8514                 print "<outline type=\"rss\" text=\"$path\" title=\"$path\" xmlUrl=\"$rss\" htmlUrl=\"$html\"/>\n";
8515         }
8516         print <<XML;
8517 </outline>
8518 </body>
8519 </opml>
8520 XML
8521 }