git-annotate.perl

   1 #!/usr/bin/perl
   2 # Copyright 2006, Ryan Anderson <ryan@michonline.com>
   3 #
   4 # GPL v2 (See COPYING)
   5 #
   6 # This file is licensed under the GPL v2, or a later version
   7 # at the discretion of Linus Torvalds.
   8
   9 use warnings;
  10 use strict;
  11 use Getopt::Long;
  12 use POSIX qw(strftime gmtime);
  13
  14 sub usage() {
  15         print STDERR 'Usage: ${\basename $0} [-s] [-S revs-file] file [ revision ]
  16         -l, --long
  17                         Show long rev (Defaults off)
  18         -r, --rename
  19                         Follow renames (Defaults on).
  20         -S, --rev-file revs-file
  21                         use revs from revs-file instead of calling git-rev-list
  22         -h, --help
  23                         This message.
  24 ';
  25
  26         exit(1);
  27 }
  28
  29 our ($help, $longrev, $rename, $starting_rev, $rev_file) = (0, 0, 1);
  30
  31 my $rc = GetOptions(    "long|l" => \$longrev,
  32                         "help|h" => \$help,
  33                         "rename|r" => \$rename,
  34                         "rev-file|S" => \$rev_file);
  35 if (!$rc or $help) {
  36         usage();
  37 }
  38
  39 my $filename = shift @ARGV;
  40 if (@ARGV) {
  41         $starting_rev = shift @ARGV;
  42 }
  43
  44 my @stack = (
  45         {
  46                 'rev' => defined $starting_rev ? $starting_rev : "HEAD",
  47                 'filename' => $filename,
  48         },
  49 );
  50
  51 our @filelines = ();
  52
  53 if (defined $starting_rev) {
  54         @filelines = git_cat_file($starting_rev, $filename);
  55 } else {
  56         open(F,"<",$filename)
  57                 or die "Failed to open filename: $!";
  58
  59         while(<F>) {
  60                 chomp;
  61                 push @filelines, $_;
  62         }
  63         close(F);
  64
  65 }
  66
  67 our %revs;
  68 our @revqueue;
  69 our $head;
  70
  71 my $revsprocessed = 0;
  72 while (my $bound = pop @stack) {
  73         my @revisions = git_rev_list($bound->{'rev'}, $bound->{'filename'});
  74         foreach my $revinst (@revisions) {
  75                 my ($rev, @parents) = @$revinst;
  76                 $head ||= $rev;
  77
  78                 if (!defined($rev)) {
  79                         $rev = "";
  80                 }
  81                 $revs{$rev}{'filename'} = $bound->{'filename'};
  82                 if (scalar @parents > 0) {
  83                         $revs{$rev}{'parents'} = \@parents;
  84                         next;
  85                 }
  86
  87                 if (!$rename) {
  88                         next;
  89                 }
  90
  91                 my $newbound = find_parent_renames($rev, $bound->{'filename'});
  92                 if ( exists $newbound->{'filename'} && $newbound->{'filename'} ne $bound->{'filename'}) {
  93                         push @stack, $newbound;
  94                         $revs{$rev}{'parents'} = [$newbound->{'rev'}];
  95                 }
  96         }
  97 }
  98 push @revqueue, $head;
  99 init_claim( defined $starting_rev ? $starting_rev : 'dirty');
 100 unless (defined $starting_rev) {
 101         my $diff = open_pipe("git","diff","-R", "HEAD", "--",$filename)
 102                 or die "Failed to call git diff to check for dirty state: $!";
 103
 104         _git_diff_parse($diff, $head, "dirty", (
 105                                 'author' => gitvar_name("GIT_AUTHOR_IDENT"),
 106                                 'author_date' => sprintf("%s +0000",time()),
 107                                 )
 108                         );
 109         close($diff);
 110 }
 111 handle_rev();
 112
 113
 114 my $i = 0;
 115 foreach my $l (@filelines) {
 116         my ($output, $rev, $committer, $date);
 117         if (ref $l eq 'ARRAY') {
 118                 ($output, $rev, $committer, $date) = @$l;
 119                 if (!$longrev && length($rev) > 8) {
 120                         $rev = substr($rev,0,8);
 121                 }
 122         } else {
 123                 $output = $l;
 124                 ($rev, $committer, $date) = ('unknown', 'unknown', 'unknown');
 125         }
 126
 127         printf("%s\t(%10s\t%10s\t%d)%s\n", $rev, $committer,
 128                 format_date($date), $i++, $output);
 129 }
 130
 131 sub init_claim {
 132         my ($rev) = @_;
 133         for (my $i = 0; $i < @filelines; $i++) {
 134                 $filelines[$i] = [ $filelines[$i], '', '', '', 1];
 135                         # line,
 136                         # rev,
 137                         # author,
 138                         # date,
 139                         # 1 <-- belongs to the original file.
 140         }
 141         $revs{$rev}{'lines'} = \@filelines;
 142 }
 143
 144
 145 sub handle_rev {
 146         my $i = 0;
 147         my %seen;
 148         while (my $rev = shift @revqueue) {
 149                 next if $seen{$rev}++;
 150
 151                 my %revinfo = git_commit_info($rev);
 152
 153                 foreach my $p (@{$revs{$rev}{'parents'}}) {
 154
 155                         git_diff_parse($p, $rev, %revinfo);
 156                         push @revqueue, $p;
 157                 }
 158
 159
 160                 if (scalar @{$revs{$rev}{parents}} == 0) {
 161                         # We must be at the initial rev here, so claim everything that is left.
 162                         for (my $i = 0; $i < @{$revs{$rev}{lines}}; $i++) {
 163                                 if (ref ${$revs{$rev}{lines}}[$i] eq '' || ${$revs{$rev}{lines}}[$i][1] eq '') {
 164                                         claim_line($i, $rev, $revs{$rev}{lines}, %revinfo);
 165                                 }
 166                         }
 167                 }
 168         }
 169 }
 170
 171
 172 sub git_rev_list {
 173         my ($rev, $file) = @_;
 174
 175         my $revlist;
 176         if ($rev_file) {
 177                 open($revlist, '<' . $rev_file);
 178         } else {
 179                 $revlist = open_pipe("git-rev-list","--parents","--remove-empty",$rev,"--",$file)
 180                         or die "Failed to exec git-rev-list: $!";
 181         }
 182
 183         my @revs;
 184         while(my $line = <$revlist>) {
 185                 chomp $line;
 186                 my ($rev, @parents) = split /\s+/, $line;
 187                 push @revs, [ $rev, @parents ];
 188         }
 189         close($revlist);
 190
 191         printf("0 revs found for rev %s (%s)\n", $rev, $file) if (@revs == 0);
 192         return @revs;
 193 }
 194
 195 sub find_parent_renames {
 196         my ($rev, $file) = @_;
 197
 198         my $patch = open_pipe("git-diff-tree", "-M50", "-r","--name-status", "-z","$rev")
 199                 or die "Failed to exec git-diff: $!";
 200
 201         local $/ = "\0";
 202         my %bound;
 203         my $junk = <$patch>;
 204         while (my $change = <$patch>) {
 205                 chomp $change;
 206                 my $filename = <$patch>;
 207                 chomp $filename;
 208
 209                 if ($change =~ m/^[AMD]$/ ) {
 210                         next;
 211                 } elsif ($change =~ m/^R/ ) {
 212                         my $oldfilename = $filename;
 213                         $filename = <$patch>;
 214                         chomp $filename;
 215                         if ( $file eq $filename ) {
 216                                 my $parent = git_find_parent($rev, $oldfilename);
 217                                 @bound{'rev','filename'} = ($parent, $oldfilename);
 218                                 last;
 219                         }
 220                 }
 221         }
 222         close($patch);
 223
 224         return \%bound;
 225 }
 226
 227
 228 sub git_find_parent {
 229         my ($rev, $filename) = @_;
 230
 231         my $revparent = open_pipe("git-rev-list","--remove-empty", "--parents","--max-count=1","$rev","--",$filename)
 232                 or die "Failed to open git-rev-list to find a single parent: $!";
 233
 234         my $parentline = <$revparent>;
 235         chomp $parentline;
 236         my ($revfound,$parent) = split m/\s+/, $parentline;
 237
 238         close($revparent);
 239
 240         return $parent;
 241 }
 242
 243
 244 # Get a diff between the current revision and a parent.
 245 # Record the commit information that results.
 246 sub git_diff_parse {
 247         my ($parent, $rev, %revinfo) = @_;
 248
 249         my $diff = open_pipe("git-diff-tree","-M","-p",$rev,$parent,"--",
 250                         $revs{$rev}{'filename'}, $revs{$parent}{'filename'})
 251                 or die "Failed to call git-diff for annotation: $!";
 252
 253         _git_diff_parse($diff, $parent, $rev, %revinfo);
 254
 255         close($diff);
 256 }
 257
 258 sub _git_diff_parse {
 259         my ($diff, $parent, $rev, %revinfo) = @_;
 260
 261         my ($ri, $pi) = (0,0);
 262         my $slines = $revs{$rev}{'lines'};
 263         my @plines;
 264
 265         my $gotheader = 0;
 266         my ($remstart);
 267         my ($hunk_start, $hunk_index);
 268         while(<$diff>) {
 269                 chomp;
 270                 if (m/^@@ -(\d+),(\d+) \+(\d+),(\d+)/) {
 271                         $remstart = $1;
 272                         # Adjust for 0-based arrays
 273                         $remstart--;
 274                         # Reinit hunk tracking.
 275                         $hunk_start = $remstart;
 276                         $hunk_index = 0;
 277                         $gotheader = 1;
 278
 279                         for (my $i = $ri; $i < $remstart; $i++) {
 280                                 $plines[$pi++] = $slines->[$i];
 281                                 $ri++;
 282                         }
 283                         next;
 284                 } elsif (!$gotheader) {
 285                         next;
 286                 }
 287
 288                 if (m/^\+(.*)$/) {
 289                         my $line = $1;
 290                         $plines[$pi++] = [ $line, '', '', '', 0 ];
 291                         next;
 292
 293                 } elsif (m/^-(.*)$/) {
 294                         my $line = $1;
 295                         if (get_line($slines, $ri) eq $line) {
 296                                 # Found a match, claim
 297                                 claim_line($ri, $rev, $slines, %revinfo);
 298                         } else {
 299                                 die sprintf("Sync error: %d/%d\n|%s\n|%s\n%s => %s\n",
 300                                                 $ri, $hunk_start + $hunk_index,
 301                                                 $line,
 302                                                 get_line($slines, $ri),
 303                                                 $rev, $parent);
 304                         }
 305                         $ri++;
 306
 307                 } else {
 308                         if (substr($_,1) ne get_line($slines,$ri) ) {
 309                                 die sprintf("Line %d (%d) does not match:\n|%s\n|%s\n%s => %s\n",
 310                                                 $hunk_start + $hunk_index, $ri,
 311                                                 substr($_,1),
 312                                                 get_line($slines,$ri),
 313                                                 $rev, $parent);
 314                         }
 315                         $plines[$pi++] = $slines->[$ri++];
 316                 }
 317                 $hunk_index++;
 318         }
 319         for (my $i = $ri; $i < @{$slines} ; $i++) {
 320                 push @plines, $slines->[$ri++];
 321         }
 322
 323         $revs{$parent}{lines} = \@plines;
 324         return;
 325 }
 326
 327 sub get_line {
 328         my ($lines, $index) = @_;
 329
 330         return ref $lines->[$index] ne '' ? $lines->[$index][0] : $lines->[$index];
 331 }
 332
 333 sub git_cat_file {
 334         my ($rev, $filename) = @_;
 335         return () unless defined $rev && defined $filename;
 336
 337         my $blob = git_ls_tree($rev, $filename);
 338
 339         my $catfile = open_pipe("git","cat-file", "blob", $blob)
 340                 or die "Failed to git-cat-file blob $blob (rev $rev, file $filename): " . $!;
 341
 342         my @lines;
 343         while(<$catfile>) {
 344                 chomp;
 345                 push @lines, $_;
 346         }
 347         close($catfile);
 348
 349         return @lines;
 350 }
 351
 352 sub git_ls_tree {
 353         my ($rev, $filename) = @_;
 354
 355         my $lstree = open_pipe("git","ls-tree",$rev,$filename)
 356                 or die "Failed to call git ls-tree: $!";
 357
 358         my ($mode, $type, $blob, $tfilename);
 359         while(<$lstree>) {
 360                 ($mode, $type, $blob, $tfilename) = split(/\s+/, $_, 4);
 361                 last if ($tfilename eq $filename);
 362         }
 363         close($lstree);
 364
 365         return $blob if $filename eq $filename;
 366         die "git-ls-tree failed to find blob for $filename";
 367
 368 }
 369
 370
 371
 372 sub claim_line {
 373         my ($floffset, $rev, $lines, %revinfo) = @_;
 374         my $oline = get_line($lines, $floffset);
 375         @{$lines->[$floffset]} = ( $oline, $rev,
 376                 $revinfo{'author'}, $revinfo{'author_date'} );
 377         #printf("Claiming line %d with rev %s: '%s'\n",
 378         #               $floffset, $rev, $oline) if 1;
 379 }
 380
 381 sub git_commit_info {
 382         my ($rev) = @_;
 383         my $commit = open_pipe("git-cat-file", "commit", $rev)
 384                 or die "Failed to call git-cat-file: $!";
 385
 386         my %info;
 387         while(<$commit>) {
 388                 chomp;
 389                 last if (length $_ == 0);
 390
 391                 if (m/^author (.*) <(.*)> (.*)$/) {
 392                         $info{'author'} = $1;
 393                         $info{'author_email'} = $2;
 394                         $info{'author_date'} = $3;
 395                 } elsif (m/^committer (.*) <(.*)> (.*)$/) {
 396                         $info{'committer'} = $1;
 397                         $info{'committer_email'} = $2;
 398                         $info{'committer_date'} = $3;
 399                 }
 400         }
 401         close($commit);
 402
 403         return %info;
 404 }
 405
 406 sub format_date {
 407         my ($timestamp, $timezone) = split(' ', $_[0]);
 408
 409         return strftime("%Y-%m-%d %H:%M:%S " . $timezone, gmtime($timestamp));
 410 }
 411
 412 # Copied from git-send-email.perl - We need a Git.pm module..
 413 sub gitvar {
 414     my ($var) = @_;
 415     my $fh;
 416     my $pid = open($fh, '-|');
 417     die "$!" unless defined $pid;
 418     if (!$pid) {
 419         exec('git-var', $var) or die "$!";
 420     }
 421     my ($val) = <$fh>;
 422     close $fh or die "$!";
 423     chomp($val);
 424     return $val;
 425 }
 426
 427 sub gitvar_name {
 428     my ($name) = @_;
 429     my $val = gitvar($name);
 430     my @field = split(/\s+/, $val);
 431     return join(' ', @field[0...(@field-4)]);
 432 }
 433
 434 sub open_pipe {
 435         if ($^O eq '##INSERT_ACTIVESTATE_STRING_HERE##') {
 436                 return open_pipe_activestate(@_);
 437         } else {
 438                 return open_pipe_normal(@_);
 439         }
 440 }
 441
 442 sub open_pipe_activestate {
 443         tie *fh, "Git::ActiveStatePipe", @_;
 444         return *fh;
 445 }
 446
 447 sub open_pipe_normal {
 448         my (@execlist) = @_;
 449
 450         my $pid = open my $kid, "-|";
 451         defined $pid or die "Cannot fork: $!";
 452
 453         unless ($pid) {
 454                 exec @execlist;
 455                 die "Cannot exec @execlist: $!";
 456         }
 457
 458         return $kid;
 459 }
 460
 461 package Git::ActiveStatePipe;
 462 use strict;
 463
 464 sub TIEHANDLE {
 465         my ($class, @params) = @_;
 466         my $cmdline = join " ", @params;
 467         my  @data = qx{$cmdline};
 468         bless { i => 0, data => \@data }, $class;
 469 }
 470
 471 sub READLINE {
 472         my $self = shift;
 473         if ($self->{i} >= scalar @{$self->{data}}) {
 474                 return undef;
 475         }
 476         return $self->{'data'}->[ $self->{i}++ ];
 477 }
 478
 479 sub CLOSE {
 480         my $self = shift;
 481         delete $self->{data};
 482         delete $self->{i};
 483 }
 484
 485 sub EOF {
 486         my $self = shift;
 487         return ($self->{i} >= scalar @{$self->{data}});
 488 }