git-add--interactive.perl

   1 #!/usr/bin/perl
   2
   3 use 5.008;
   4 use strict;
   5 use warnings;
   6 use Git;
   7
   8 binmode(STDOUT, ":raw");
   9
  10 my $repo = Git->repository();
  11
  12 my $menu_use_color = $repo->get_colorbool('color.interactive');
  13 my ($prompt_color, $header_color, $help_color) =
  14         $menu_use_color ? (
  15                 $repo->get_color('color.interactive.prompt', 'bold blue'),
  16                 $repo->get_color('color.interactive.header', 'bold'),
  17                 $repo->get_color('color.interactive.help', 'red bold'),
  18         ) : ();
  19 my $error_color = ();
  20 if ($menu_use_color) {
  21         my $help_color_spec = ($repo->config('color.interactive.help') or
  22                                 'red bold');
  23         $error_color = $repo->get_color('color.interactive.error',
  24                                         $help_color_spec);
  25 }
  26
  27 my $diff_use_color = $repo->get_colorbool('color.diff');
  28 my ($fraginfo_color) =
  29         $diff_use_color ? (
  30                 $repo->get_color('color.diff.frag', 'cyan'),
  31         ) : ();
  32 my ($diff_plain_color) =
  33         $diff_use_color ? (
  34                 $repo->get_color('color.diff.plain', ''),
  35         ) : ();
  36 my ($diff_old_color) =
  37         $diff_use_color ? (
  38                 $repo->get_color('color.diff.old', 'red'),
  39         ) : ();
  40 my ($diff_new_color) =
  41         $diff_use_color ? (
  42                 $repo->get_color('color.diff.new', 'green'),
  43         ) : ();
  44
  45 my $normal_color = $repo->get_color("", "reset");
  46
  47 my $diff_algorithm = $repo->config('diff.algorithm');
  48
  49 my $use_readkey = 0;
  50 my $use_termcap = 0;
  51 my %term_escapes;
  52
  53 sub ReadMode;
  54 sub ReadKey;
  55 if ($repo->config_bool("interactive.singlekey")) {
  56         eval {
  57                 require Term::ReadKey;
  58                 Term::ReadKey->import;
  59                 $use_readkey = 1;
  60         };
  61         eval {
  62                 require Term::Cap;
  63                 my $termcap = Term::Cap->Tgetent;
  64                 foreach (values %$termcap) {
  65                         $term_escapes{$_} = 1 if /^\e/;
  66                 }
  67                 $use_termcap = 1;
  68         };
  69 }
  70
  71 sub colored {
  72         my $color = shift;
  73         my $string = join("", @_);
  74
  75         if (defined $color) {
  76                 # Put a color code at the beginning of each line, a reset at the end
  77                 # color after newlines that are not at the end of the string
  78                 $string =~ s/(\n+)(.)/$1$color$2/g;
  79                 # reset before newlines
  80                 $string =~ s/(\n+)/$normal_color$1/g;
  81                 # codes at beginning and end (if necessary):
  82                 $string =~ s/^/$color/;
  83                 $string =~ s/$/$normal_color/ unless $string =~ /\n$/;
  84         }
  85         return $string;
  86 }
  87
  88 # command line options
  89 my $patch_mode;
  90 my $patch_mode_revision;
  91
  92 sub apply_patch;
  93 sub apply_patch_for_checkout_commit;
  94 sub apply_patch_for_stash;
  95
  96 my %patch_modes = (
  97         'stage' => {
  98                 DIFF => 'diff-files -p',
  99                 APPLY => sub { apply_patch 'apply --cached', @_; },
 100                 APPLY_CHECK => 'apply --cached',
 101                 VERB => 'Stage',
 102                 TARGET => '',
 103                 PARTICIPLE => 'staging',
 104                 FILTER => 'file-only',
 105                 IS_REVERSE => 0,
 106         },
 107         'stash' => {
 108                 DIFF => 'diff-index -p HEAD',
 109                 APPLY => sub { apply_patch 'apply --cached', @_; },
 110                 APPLY_CHECK => 'apply --cached',
 111                 VERB => 'Stash',
 112                 TARGET => '',
 113                 PARTICIPLE => 'stashing',
 114                 FILTER => undef,
 115                 IS_REVERSE => 0,
 116         },
 117         'reset_head' => {
 118                 DIFF => 'diff-index -p --cached',
 119                 APPLY => sub { apply_patch 'apply -R --cached', @_; },
 120                 APPLY_CHECK => 'apply -R --cached',
 121                 VERB => 'Unstage',
 122                 TARGET => '',
 123                 PARTICIPLE => 'unstaging',
 124                 FILTER => 'index-only',
 125                 IS_REVERSE => 1,
 126         },
 127         'reset_nothead' => {
 128                 DIFF => 'diff-index -R -p --cached',
 129                 APPLY => sub { apply_patch 'apply --cached', @_; },
 130                 APPLY_CHECK => 'apply --cached',
 131                 VERB => 'Apply',
 132                 TARGET => ' to index',
 133                 PARTICIPLE => 'applying',
 134                 FILTER => 'index-only',
 135                 IS_REVERSE => 0,
 136         },
 137         'checkout_index' => {
 138                 DIFF => 'diff-files -p',
 139                 APPLY => sub { apply_patch 'apply -R', @_; },
 140                 APPLY_CHECK => 'apply -R',
 141                 VERB => 'Discard',
 142                 TARGET => ' from worktree',
 143                 PARTICIPLE => 'discarding',
 144                 FILTER => 'file-only',
 145                 IS_REVERSE => 1,
 146         },
 147         'checkout_head' => {
 148                 DIFF => 'diff-index -p',
 149                 APPLY => sub { apply_patch_for_checkout_commit '-R', @_ },
 150                 APPLY_CHECK => 'apply -R',
 151                 VERB => 'Discard',
 152                 TARGET => ' from index and worktree',
 153                 PARTICIPLE => 'discarding',
 154                 FILTER => undef,
 155                 IS_REVERSE => 1,
 156         },
 157         'checkout_nothead' => {
 158                 DIFF => 'diff-index -R -p',
 159                 APPLY => sub { apply_patch_for_checkout_commit '', @_ },
 160                 APPLY_CHECK => 'apply',
 161                 VERB => 'Apply',
 162                 TARGET => ' to index and worktree',
 163                 PARTICIPLE => 'applying',
 164                 FILTER => undef,
 165                 IS_REVERSE => 0,
 166         },
 167 );
 168
 169 my %patch_mode_flavour = %{$patch_modes{stage}};
 170
 171 sub run_cmd_pipe {
 172         if ($^O eq 'MSWin32') {
 173                 my @invalid = grep {m/[":*]/} @_;
 174                 die "$^O does not support: @invalid\n" if @invalid;
 175                 my @args = map { m/ /o ? "\"$_\"": $_ } @_;
 176                 return qx{@args};
 177         } else {
 178                 my $fh = undef;
 179                 open($fh, '-|', @_) or die;
 180                 return <$fh>;
 181         }
 182 }
 183
 184 my ($GIT_DIR) = run_cmd_pipe(qw(git rev-parse --git-dir));
 185
 186 if (!defined $GIT_DIR) {
 187         exit(1); # rev-parse would have already said "not a git repo"
 188 }
 189 chomp($GIT_DIR);
 190
 191 my %cquote_map = (
 192  "b" => chr(8),
 193  "t" => chr(9),
 194  "n" => chr(10),
 195  "v" => chr(11),
 196  "f" => chr(12),
 197  "r" => chr(13),
 198  "\\" => "\\",
 199  "\042" => "\042",
 200 );
 201
 202 sub unquote_path {
 203         local ($_) = @_;
 204         my ($retval, $remainder);
 205         if (!/^\042(.*)\042$/) {
 206                 return $_;
 207         }
 208         ($_, $retval) = ($1, "");
 209         while (/^([^\\]*)\\(.*)$/) {
 210                 $remainder = $2;
 211                 $retval .= $1;
 212                 for ($remainder) {
 213                         if (/^([0-3][0-7][0-7])(.*)$/) {
 214                                 $retval .= chr(oct($1));
 215                                 $_ = $2;
 216                                 last;
 217                         }
 218                         if (/^([\\\042btnvfr])(.*)$/) {
 219                                 $retval .= $cquote_map{$1};
 220                                 $_ = $2;
 221                                 last;
 222                         }
 223                         # This is malformed -- just return it as-is for now.
 224                         return $_[0];
 225                 }
 226                 $_ = $remainder;
 227         }
 228         $retval .= $_;
 229         return $retval;
 230 }
 231
 232 sub refresh {
 233         my $fh;
 234         open $fh, 'git update-index --refresh |'
 235             or die;
 236         while (<$fh>) {
 237                 ;# ignore 'needs update'
 238         }
 239         close $fh;
 240 }
 241
 242 sub list_untracked {
 243         map {
 244                 chomp $_;
 245                 unquote_path($_);
 246         }
 247         run_cmd_pipe(qw(git ls-files --others --exclude-standard --), @ARGV);
 248 }
 249
 250 my $status_fmt = '%12s %12s %s';
 251 my $status_head = sprintf($status_fmt, 'staged', 'unstaged', 'path');
 252
 253 {
 254         my $initial;
 255         sub is_initial_commit {
 256                 $initial = system('git rev-parse HEAD -- >/dev/null 2>&1') != 0
 257                         unless defined $initial;
 258                 return $initial;
 259         }
 260 }
 261
 262 sub get_empty_tree {
 263         return '4b825dc642cb6eb9a060e54bf8d69288fbee4904';
 264 }
 265
 266 # Returns list of hashes, contents of each of which are:
 267 # VALUE:        pathname
 268 # BINARY:       is a binary path
 269 # INDEX:        is index different from HEAD?
 270 # FILE:         is file different from index?
 271 # INDEX_ADDDEL: is it add/delete between HEAD and index?
 272 # FILE_ADDDEL:  is it add/delete between index and file?
 273 # UNMERGED:     is the path unmerged
 274
 275 sub list_modified {
 276         my ($only) = @_;
 277         my (%data, @return);
 278         my ($add, $del, $adddel, $file);
 279         my @tracked = ();
 280
 281         if (@ARGV) {
 282                 @tracked = map {
 283                         chomp $_;
 284                         unquote_path($_);
 285                 } run_cmd_pipe(qw(git ls-files --), @ARGV);
 286                 return if (!@tracked);
 287         }
 288
 289         my $reference;
 290         if (defined $patch_mode_revision and $patch_mode_revision ne 'HEAD') {
 291                 $reference = $patch_mode_revision;
 292         } elsif (is_initial_commit()) {
 293                 $reference = get_empty_tree();
 294         } else {
 295                 $reference = 'HEAD';
 296         }
 297         for (run_cmd_pipe(qw(git diff-index --cached
 298                              --numstat --summary), $reference,
 299                              '--', @tracked)) {
 300                 if (($add, $del, $file) =
 301                     /^([-\d]+)  ([-\d]+)        (.*)/) {
 302                         my ($change, $bin);
 303                         $file = unquote_path($file);
 304                         if ($add eq '-' && $del eq '-') {
 305                                 $change = 'binary';
 306                                 $bin = 1;
 307                         }
 308                         else {
 309                                 $change = "+$add/-$del";
 310                         }
 311                         $data{$file} = {
 312                                 INDEX => $change,
 313                                 BINARY => $bin,
 314                                 FILE => 'nothing',
 315                         }
 316                 }
 317                 elsif (($adddel, $file) =
 318                        /^ (create|delete) mode [0-7]+ (.*)$/) {
 319                         $file = unquote_path($file);
 320                         $data{$file}{INDEX_ADDDEL} = $adddel;
 321                 }
 322         }
 323
 324         for (run_cmd_pipe(qw(git diff-files --numstat --summary --raw --), @tracked)) {
 325                 if (($add, $del, $file) =
 326                     /^([-\d]+)  ([-\d]+)        (.*)/) {
 327                         $file = unquote_path($file);
 328                         my ($change, $bin);
 329                         if ($add eq '-' && $del eq '-') {
 330                                 $change = 'binary';
 331                                 $bin = 1;
 332                         }
 333                         else {
 334                                 $change = "+$add/-$del";
 335                         }
 336                         $data{$file}{FILE} = $change;
 337                         if ($bin) {
 338                                 $data{$file}{BINARY} = 1;
 339                         }
 340                 }
 341                 elsif (($adddel, $file) =
 342                        /^ (create|delete) mode [0-7]+ (.*)$/) {
 343                         $file = unquote_path($file);
 344                         $data{$file}{FILE_ADDDEL} = $adddel;
 345                 }
 346                 elsif (/^:[0-7]+ [0-7]+ [0-9a-f]+ [0-9a-f]+ (.) (.*)$/) {
 347                         $file = unquote_path($2);
 348                         if (!exists $data{$file}) {
 349                                 $data{$file} = +{
 350                                         INDEX => 'unchanged',
 351                                         BINARY => 0,
 352                                 };
 353                         }
 354                         if ($1 eq 'U') {
 355                                 $data{$file}{UNMERGED} = 1;
 356                         }
 357                 }
 358         }
 359
 360         for (sort keys %data) {
 361                 my $it = $data{$_};
 362
 363                 if ($only) {
 364                         if ($only eq 'index-only') {
 365                                 next if ($it->{INDEX} eq 'unchanged');
 366                         }
 367                         if ($only eq 'file-only') {
 368                                 next if ($it->{FILE} eq 'nothing');
 369                         }
 370                 }
 371                 push @return, +{
 372                         VALUE => $_,
 373                         %$it,
 374                 };
 375         }
 376         return @return;
 377 }
 378
 379 sub find_unique {
 380         my ($string, @stuff) = @_;
 381         my $found = undef;
 382         for (my $i = 0; $i < @stuff; $i++) {
 383                 my $it = $stuff[$i];
 384                 my $hit = undef;
 385                 if (ref $it) {
 386                         if ((ref $it) eq 'ARRAY') {
 387                                 $it = $it->[0];
 388                         }
 389                         else {
 390                                 $it = $it->{VALUE};
 391                         }
 392                 }
 393                 eval {
 394                         if ($it =~ /^$string/) {
 395                                 $hit = 1;
 396                         };
 397                 };
 398                 if (defined $hit && defined $found) {
 399                         return undef;
 400                 }
 401                 if ($hit) {
 402                         $found = $i + 1;
 403                 }
 404         }
 405         return $found;
 406 }
 407
 408 # inserts string into trie and updates count for each character
 409 sub update_trie {
 410         my ($trie, $string) = @_;
 411         foreach (split //, $string) {
 412                 $trie = $trie->{$_} ||= {COUNT => 0};
 413                 $trie->{COUNT}++;
 414         }
 415 }
 416
 417 # returns an array of tuples (prefix, remainder)
 418 sub find_unique_prefixes {
 419         my @stuff = @_;
 420         my @return = ();
 421
 422         # any single prefix exceeding the soft limit is omitted
 423         # if any prefix exceeds the hard limit all are omitted
 424         # 0 indicates no limit
 425         my $soft_limit = 0;
 426         my $hard_limit = 3;
 427
 428         # build a trie modelling all possible options
 429         my %trie;
 430         foreach my $print (@stuff) {
 431                 if ((ref $print) eq 'ARRAY') {
 432                         $print = $print->[0];
 433                 }
 434                 elsif ((ref $print) eq 'HASH') {
 435                         $print = $print->{VALUE};
 436                 }
 437                 update_trie(\%trie, $print);
 438                 push @return, $print;
 439         }
 440
 441         # use the trie to find the unique prefixes
 442         for (my $i = 0; $i < @return; $i++) {
 443                 my $ret = $return[$i];
 444                 my @letters = split //, $ret;
 445                 my %search = %trie;
 446                 my ($prefix, $remainder);
 447                 my $j;
 448                 for ($j = 0; $j < @letters; $j++) {
 449                         my $letter = $letters[$j];
 450                         if ($search{$letter}{COUNT} == 1) {
 451                                 $prefix = substr $ret, 0, $j + 1;
 452                                 $remainder = substr $ret, $j + 1;
 453                                 last;
 454                         }
 455                         else {
 456                                 my $prefix = substr $ret, 0, $j;
 457                                 return ()
 458                                     if ($hard_limit && $j + 1 > $hard_limit);
 459                         }
 460                         %search = %{$search{$letter}};
 461                 }
 462                 if (ord($letters[0]) > 127 ||
 463                     ($soft_limit && $j + 1 > $soft_limit)) {
 464                         $prefix = undef;
 465                         $remainder = $ret;
 466                 }
 467                 $return[$i] = [$prefix, $remainder];
 468         }
 469         return @return;
 470 }
 471
 472 # filters out prefixes which have special meaning to list_and_choose()
 473 sub is_valid_prefix {
 474         my $prefix = shift;
 475         return (defined $prefix) &&
 476             !($prefix =~ /[\s,]/) && # separators
 477             !($prefix =~ /^-/) &&    # deselection
 478             !($prefix =~ /^\d+/) &&  # selection
 479             ($prefix ne '*') &&      # "all" wildcard
 480             ($prefix ne '?');        # prompt help
 481 }
 482
 483 # given a prefix/remainder tuple return a string with the prefix highlighted
 484 # for now use square brackets; later might use ANSI colors (underline, bold)
 485 sub highlight_prefix {
 486         my $prefix = shift;
 487         my $remainder = shift;
 488
 489         if (!defined $prefix) {
 490                 return $remainder;
 491         }
 492
 493         if (!is_valid_prefix($prefix)) {
 494                 return "$prefix$remainder";
 495         }
 496
 497         if (!$menu_use_color) {
 498                 return "[$prefix]$remainder";
 499         }
 500
 501         return "$prompt_color$prefix$normal_color$remainder";
 502 }
 503
 504 sub error_msg {
 505         print STDERR colored $error_color, @_;
 506 }
 507
 508 sub list_and_choose {
 509         my ($opts, @stuff) = @_;
 510         my (@chosen, @return);
 511         my $i;
 512         my @prefixes = find_unique_prefixes(@stuff) unless $opts->{LIST_ONLY};
 513
 514       TOPLOOP:
 515         while (1) {
 516                 my $last_lf = 0;
 517
 518                 if ($opts->{HEADER}) {
 519                         if (!$opts->{LIST_FLAT}) {
 520                                 print "     ";
 521                         }
 522                         print colored $header_color, "$opts->{HEADER}\n";
 523                 }
 524                 for ($i = 0; $i < @stuff; $i++) {
 525                         my $chosen = $chosen[$i] ? '*' : ' ';
 526                         my $print = $stuff[$i];
 527                         my $ref = ref $print;
 528                         my $highlighted = highlight_prefix(@{$prefixes[$i]})
 529                             if @prefixes;
 530                         if ($ref eq 'ARRAY') {
 531                                 $print = $highlighted || $print->[0];
 532                         }
 533                         elsif ($ref eq 'HASH') {
 534                                 my $value = $highlighted || $print->{VALUE};
 535                                 $print = sprintf($status_fmt,
 536                                     $print->{INDEX},
 537                                     $print->{FILE},
 538                                     $value);
 539                         }
 540                         else {
 541                                 $print = $highlighted || $print;
 542                         }
 543                         printf("%s%2d: %s", $chosen, $i+1, $print);
 544                         if (($opts->{LIST_FLAT}) &&
 545                             (($i + 1) % ($opts->{LIST_FLAT}))) {
 546                                 print "\t";
 547                                 $last_lf = 0;
 548                         }
 549                         else {
 550                                 print "\n";
 551                                 $last_lf = 1;
 552                         }
 553                 }
 554                 if (!$last_lf) {
 555                         print "\n";
 556                 }
 557
 558                 return if ($opts->{LIST_ONLY});
 559
 560                 print colored $prompt_color, $opts->{PROMPT};
 561                 if ($opts->{SINGLETON}) {
 562                         print "> ";
 563                 }
 564                 else {
 565                         print ">> ";
 566                 }
 567                 my $line = <STDIN>;
 568                 if (!$line) {
 569                         print "\n";
 570                         $opts->{ON_EOF}->() if $opts->{ON_EOF};
 571                         last;
 572                 }
 573                 chomp $line;
 574                 last if $line eq '';
 575                 if ($line eq '?') {
 576                         $opts->{SINGLETON} ?
 577                             singleton_prompt_help_cmd() :
 578                             prompt_help_cmd();
 579                         next TOPLOOP;
 580                 }
 581                 for my $choice (split(/[\s,]+/, $line)) {
 582                         my $choose = 1;
 583                         my ($bottom, $top);
 584
 585                         # Input that begins with '-'; unchoose
 586                         if ($choice =~ s/^-//) {
 587                                 $choose = 0;
 588                         }
 589                         # A range can be specified like 5-7 or 5-.
 590                         if ($choice =~ /^(\d+)-(\d*)$/) {
 591                                 ($bottom, $top) = ($1, length($2) ? $2 : 1 + @stuff);
 592                         }
 593                         elsif ($choice =~ /^\d+$/) {
 594                                 $bottom = $top = $choice;
 595                         }
 596                         elsif ($choice eq '*') {
 597                                 $bottom = 1;
 598                                 $top = 1 + @stuff;
 599                         }
 600                         else {
 601                                 $bottom = $top = find_unique($choice, @stuff);
 602                                 if (!defined $bottom) {
 603                                         error_msg "Huh ($choice)?\n";
 604                                         next TOPLOOP;
 605                                 }
 606                         }
 607                         if ($opts->{SINGLETON} && $bottom != $top) {
 608                                 error_msg "Huh ($choice)?\n";
 609                                 next TOPLOOP;
 610                         }
 611                         for ($i = $bottom-1; $i <= $top-1; $i++) {
 612                                 next if (@stuff <= $i || $i < 0);
 613                                 $chosen[$i] = $choose;
 614                         }
 615                 }
 616                 last if ($opts->{IMMEDIATE} || $line eq '*');
 617         }
 618         for ($i = 0; $i < @stuff; $i++) {
 619                 if ($chosen[$i]) {
 620                         push @return, $stuff[$i];
 621                 }
 622         }
 623         return @return;
 624 }
 625
 626 sub singleton_prompt_help_cmd {
 627         print colored $help_color, <<\EOF ;
 628 Prompt help:
 629 1          - select a numbered item
 630 foo        - select item based on unique prefix
 631            - (empty) select nothing
 632 EOF
 633 }
 634
 635 sub prompt_help_cmd {
 636         print colored $help_color, <<\EOF ;
 637 Prompt help:
 638 1          - select a single item
 639 3-5        - select a range of items
 640 2-3,6-9    - select multiple ranges
 641 foo        - select item based on unique prefix
 642 -...       - unselect specified items
 643 *          - choose all items
 644            - (empty) finish selecting
 645 EOF
 646 }
 647
 648 sub status_cmd {
 649         list_and_choose({ LIST_ONLY => 1, HEADER => $status_head },
 650                         list_modified());
 651         print "\n";
 652 }
 653
 654 sub say_n_paths {
 655         my $did = shift @_;
 656         my $cnt = scalar @_;
 657         print "$did ";
 658         if (1 < $cnt) {
 659                 print "$cnt paths\n";
 660         }
 661         else {
 662                 print "one path\n";
 663         }
 664 }
 665
 666 sub update_cmd {
 667         my @mods = list_modified('file-only');
 668         return if (!@mods);
 669
 670         my @update = list_and_choose({ PROMPT => 'Update',
 671                                        HEADER => $status_head, },
 672                                      @mods);
 673         if (@update) {
 674                 system(qw(git update-index --add --remove --),
 675                        map { $_->{VALUE} } @update);
 676                 say_n_paths('updated', @update);
 677         }
 678         print "\n";
 679 }
 680
 681 sub revert_cmd {
 682         my @update = list_and_choose({ PROMPT => 'Revert',
 683                                        HEADER => $status_head, },
 684                                      list_modified());
 685         if (@update) {
 686                 if (is_initial_commit()) {
 687                         system(qw(git rm --cached),
 688                                 map { $_->{VALUE} } @update);
 689                 }
 690                 else {
 691                         my @lines = run_cmd_pipe(qw(git ls-tree HEAD --),
 692                                                  map { $_->{VALUE} } @update);
 693                         my $fh;
 694                         open $fh, '| git update-index --index-info'
 695                             or die;
 696                         for (@lines) {
 697                                 print $fh $_;
 698                         }
 699                         close($fh);
 700                         for (@update) {
 701                                 if ($_->{INDEX_ADDDEL} &&
 702                                     $_->{INDEX_ADDDEL} eq 'create') {
 703                                         system(qw(git update-index --force-remove --),
 704                                                $_->{VALUE});
 705                                         print "note: $_->{VALUE} is untracked now.\n";
 706                                 }
 707                         }
 708                 }
 709                 refresh();
 710                 say_n_paths('reverted', @update);
 711         }
 712         print "\n";
 713 }
 714
 715 sub add_untracked_cmd {
 716         my @add = list_and_choose({ PROMPT => 'Add untracked' },
 717                                   list_untracked());
 718         if (@add) {
 719                 system(qw(git update-index --add --), @add);
 720                 say_n_paths('added', @add);
 721         }
 722         print "\n";
 723 }
 724
 725 sub run_git_apply {
 726         my $cmd = shift;
 727         my $fh;
 728         open $fh, '| git ' . $cmd . " --recount --allow-overlap";
 729         print $fh @_;
 730         return close $fh;
 731 }
 732
 733 sub parse_diff {
 734         my ($path) = @_;
 735         my @diff_cmd = split(" ", $patch_mode_flavour{DIFF});
 736         if (defined $diff_algorithm) {
 737                 splice @diff_cmd, 1, 0, "--diff-algorithm=${diff_algorithm}";
 738         }
 739         if (defined $patch_mode_revision) {
 740                 push @diff_cmd, $patch_mode_revision;
 741         }
 742         my @diff = run_cmd_pipe("git", @diff_cmd, "--", $path);
 743         my @colored = ();
 744         if ($diff_use_color) {
 745                 @colored = run_cmd_pipe("git", @diff_cmd, qw(--color --), $path);
 746         }
 747         my (@hunk) = { TEXT => [], DISPLAY => [], TYPE => 'header' };
 748
 749         for (my $i = 0; $i < @diff; $i++) {
 750                 if ($diff[$i] =~ /^@@ /) {
 751                         push @hunk, { TEXT => [], DISPLAY => [],
 752                                 TYPE => 'hunk' };
 753                 }
 754                 push @{$hunk[-1]{TEXT}}, $diff[$i];
 755                 push @{$hunk[-1]{DISPLAY}},
 756                         ($diff_use_color ? $colored[$i] : $diff[$i]);
 757         }
 758         return @hunk;
 759 }
 760
 761 sub parse_diff_header {
 762         my $src = shift;
 763
 764         my $head = { TEXT => [], DISPLAY => [], TYPE => 'header' };
 765         my $mode = { TEXT => [], DISPLAY => [], TYPE => 'mode' };
 766         my $deletion = { TEXT => [], DISPLAY => [], TYPE => 'deletion' };
 767
 768         for (my $i = 0; $i < @{$src->{TEXT}}; $i++) {
 769                 my $dest =
 770                    $src->{TEXT}->[$i] =~ /^(old|new) mode (\d+)$/ ? $mode :
 771                    $src->{TEXT}->[$i] =~ /^deleted file/ ? $deletion :
 772                    $head;
 773                 push @{$dest->{TEXT}}, $src->{TEXT}->[$i];
 774                 push @{$dest->{DISPLAY}}, $src->{DISPLAY}->[$i];
 775         }
 776         return ($head, $mode, $deletion);
 777 }
 778
 779 sub hunk_splittable {
 780         my ($text) = @_;
 781
 782         my @s = split_hunk($text);
 783         return (1 < @s);
 784 }
 785
 786 sub parse_hunk_header {
 787         my ($line) = @_;
 788         my ($o_ofs, $o_cnt, $n_ofs, $n_cnt) =
 789             $line =~ /^@@ -(\d+)(?:,(\d+))? \+(\d+)(?:,(\d+))? @@/;
 790         $o_cnt = 1 unless defined $o_cnt;
 791         $n_cnt = 1 unless defined $n_cnt;
 792         return ($o_ofs, $o_cnt, $n_ofs, $n_cnt);
 793 }
 794
 795 sub split_hunk {
 796         my ($text, $display) = @_;
 797         my @split = ();
 798         if (!defined $display) {
 799                 $display = $text;
 800         }
 801         # If there are context lines in the middle of a hunk,
 802         # it can be split, but we would need to take care of
 803         # overlaps later.
 804
 805         my ($o_ofs, undef, $n_ofs) = parse_hunk_header($text->[0]);
 806         my $hunk_start = 1;
 807
 808       OUTER:
 809         while (1) {
 810                 my $next_hunk_start = undef;
 811                 my $i = $hunk_start - 1;
 812                 my $this = +{
 813                         TEXT => [],
 814                         DISPLAY => [],
 815                         TYPE => 'hunk',
 816                         OLD => $o_ofs,
 817                         NEW => $n_ofs,
 818                         OCNT => 0,
 819                         NCNT => 0,
 820                         ADDDEL => 0,
 821                         POSTCTX => 0,
 822                         USE => undef,
 823                 };
 824
 825                 while (++$i < @$text) {
 826                         my $line = $text->[$i];
 827                         my $display = $display->[$i];
 828                         if ($line =~ /^ /) {
 829                                 if ($this->{ADDDEL} &&
 830                                     !defined $next_hunk_start) {
 831                                         # We have seen leading context and
 832                                         # adds/dels and then here is another
 833                                         # context, which is trailing for this
 834                                         # split hunk and leading for the next
 835                                         # one.
 836                                         $next_hunk_start = $i;
 837                                 }
 838                                 push @{$this->{TEXT}}, $line;
 839                                 push @{$this->{DISPLAY}}, $display;
 840                                 $this->{OCNT}++;
 841                                 $this->{NCNT}++;
 842                                 if (defined $next_hunk_start) {
 843                                         $this->{POSTCTX}++;
 844                                 }
 845                                 next;
 846                         }
 847
 848                         # add/del
 849                         if (defined $next_hunk_start) {
 850                                 # We are done with the current hunk and
 851                                 # this is the first real change for the
 852                                 # next split one.
 853                                 $hunk_start = $next_hunk_start;
 854                                 $o_ofs = $this->{OLD} + $this->{OCNT};
 855                                 $n_ofs = $this->{NEW} + $this->{NCNT};
 856                                 $o_ofs -= $this->{POSTCTX};
 857                                 $n_ofs -= $this->{POSTCTX};
 858                                 push @split, $this;
 859                                 redo OUTER;
 860                         }
 861                         push @{$this->{TEXT}}, $line;
 862                         push @{$this->{DISPLAY}}, $display;
 863                         $this->{ADDDEL}++;
 864                         if ($line =~ /^-/) {
 865                                 $this->{OCNT}++;
 866                         }
 867                         else {
 868                                 $this->{NCNT}++;
 869                         }
 870                 }
 871
 872                 push @split, $this;
 873                 last;
 874         }
 875
 876         for my $hunk (@split) {
 877                 $o_ofs = $hunk->{OLD};
 878                 $n_ofs = $hunk->{NEW};
 879                 my $o_cnt = $hunk->{OCNT};
 880                 my $n_cnt = $hunk->{NCNT};
 881
 882                 my $head = ("@@ -$o_ofs" .
 883                             (($o_cnt != 1) ? ",$o_cnt" : '') .
 884                             " +$n_ofs" .
 885                             (($n_cnt != 1) ? ",$n_cnt" : '') .
 886                             " @@\n");
 887                 my $display_head = $head;
 888                 unshift @{$hunk->{TEXT}}, $head;
 889                 if ($diff_use_color) {
 890                         $display_head = colored($fraginfo_color, $head);
 891                 }
 892                 unshift @{$hunk->{DISPLAY}}, $display_head;
 893         }
 894         return @split;
 895 }
 896
 897 sub find_last_o_ctx {
 898         my ($it) = @_;
 899         my $text = $it->{TEXT};
 900         my ($o_ofs, $o_cnt) = parse_hunk_header($text->[0]);
 901         my $i = @{$text};
 902         my $last_o_ctx = $o_ofs + $o_cnt;
 903         while (0 < --$i) {
 904                 my $line = $text->[$i];
 905                 if ($line =~ /^ /) {
 906                         $last_o_ctx--;
 907                         next;
 908                 }
 909                 last;
 910         }
 911         return $last_o_ctx;
 912 }
 913
 914 sub merge_hunk {
 915         my ($prev, $this) = @_;
 916         my ($o0_ofs, $o0_cnt, $n0_ofs, $n0_cnt) =
 917             parse_hunk_header($prev->{TEXT}[0]);
 918         my ($o1_ofs, $o1_cnt, $n1_ofs, $n1_cnt) =
 919             parse_hunk_header($this->{TEXT}[0]);
 920
 921         my (@line, $i, $ofs, $o_cnt, $n_cnt);
 922         $ofs = $o0_ofs;
 923         $o_cnt = $n_cnt = 0;
 924         for ($i = 1; $i < @{$prev->{TEXT}}; $i++) {
 925                 my $line = $prev->{TEXT}[$i];
 926                 if ($line =~ /^\+/) {
 927                         $n_cnt++;
 928                         push @line, $line;
 929                         next;
 930                 }
 931
 932                 last if ($o1_ofs <= $ofs);
 933
 934                 $o_cnt++;
 935                 $ofs++;
 936                 if ($line =~ /^ /) {
 937                         $n_cnt++;
 938                 }
 939                 push @line, $line;
 940         }
 941
 942         for ($i = 1; $i < @{$this->{TEXT}}; $i++) {
 943                 my $line = $this->{TEXT}[$i];
 944                 if ($line =~ /^\+/) {
 945                         $n_cnt++;
 946                         push @line, $line;
 947                         next;
 948                 }
 949                 $ofs++;
 950                 $o_cnt++;
 951                 if ($line =~ /^ /) {
 952                         $n_cnt++;
 953                 }
 954                 push @line, $line;
 955         }
 956         my $head = ("@@ -$o0_ofs" .
 957                     (($o_cnt != 1) ? ",$o_cnt" : '') .
 958                     " +$n0_ofs" .
 959                     (($n_cnt != 1) ? ",$n_cnt" : '') .
 960                     " @@\n");
 961         @{$prev->{TEXT}} = ($head, @line);
 962 }
 963
 964 sub coalesce_overlapping_hunks {
 965         my (@in) = @_;
 966         my @out = ();
 967
 968         my ($last_o_ctx, $last_was_dirty);
 969
 970         for (grep { $_->{USE} } @in) {
 971                 if ($_->{TYPE} ne 'hunk') {
 972                         push @out, $_;
 973                         next;
 974                 }
 975                 my $text = $_->{TEXT};
 976                 my ($o_ofs) = parse_hunk_header($text->[0]);
 977                 if (defined $last_o_ctx &&
 978                     $o_ofs <= $last_o_ctx &&
 979                     !$_->{DIRTY} &&
 980                     !$last_was_dirty) {
 981                         merge_hunk($out[-1], $_);
 982                 }
 983                 else {
 984                         push @out, $_;
 985                 }
 986                 $last_o_ctx = find_last_o_ctx($out[-1]);
 987                 $last_was_dirty = $_->{DIRTY};
 988         }
 989         return @out;
 990 }
 991
 992 sub reassemble_patch {
 993         my $head = shift;
 994         my @patch;
 995
 996         # Include everything in the header except the beginning of the diff.
 997         push @patch, (grep { !/^[-+]{3}/ } @$head);
 998
 999         # Then include any headers from the hunk lines, which must
1000         # come before any actual hunk.
1001         while (@_ && $_[0] !~ /^@/) {
1002                 push @patch, shift;
1003         }
1004
1005         # Then begin the diff.
1006         push @patch, grep { /^[-+]{3}/ } @$head;
1007
1008         # And then the actual hunks.
1009         push @patch, @_;
1010
1011         return @patch;
1012 }
1013
1014 sub color_diff {
1015         return map {
1016                 colored((/^@/  ? $fraginfo_color :
1017                          /^\+/ ? $diff_new_color :
1018                          /^-/  ? $diff_old_color :
1019                          $diff_plain_color),
1020                         $_);
1021         } @_;
1022 }
1023
1024 sub edit_hunk_manually {
1025         my ($oldtext) = @_;
1026
1027         my $hunkfile = $repo->repo_path . "/addp-hunk-edit.diff";
1028         my $fh;
1029         open $fh, '>', $hunkfile
1030                 or die "failed to open hunk edit file for writing: " . $!;
1031         print $fh "# Manual hunk edit mode -- see bottom for a quick guide\n";
1032         print $fh @$oldtext;
1033         my $participle = $patch_mode_flavour{PARTICIPLE};
1034         my $is_reverse = $patch_mode_flavour{IS_REVERSE};
1035         my ($remove_plus, $remove_minus) = $is_reverse ? ('-', '+') : ('+', '-');
1036         print $fh <<EOF;
1037 # ---
1038 # To remove '$remove_minus' lines, make them ' ' lines (context).
1039 # To remove '$remove_plus' lines, delete them.
1040 # Lines starting with # will be removed.
1041 #
1042 # If the patch applies cleanly, the edited hunk will immediately be
1043 # marked for $participle. If it does not apply cleanly, you will be given
1044 # an opportunity to edit again. If all lines of the hunk are removed,
1045 # then the edit is aborted and the hunk is left unchanged.
1046 EOF
1047         close $fh;
1048
1049         chomp(my $editor = run_cmd_pipe(qw(git var GIT_EDITOR)));
1050         system('sh', '-c', $editor.' "$@"', $editor, $hunkfile);
1051
1052         if ($? != 0) {
1053                 return undef;
1054         }
1055
1056         open $fh, '<', $hunkfile
1057                 or die "failed to open hunk edit file for reading: " . $!;
1058         my @newtext = grep { !/^#/ } <$fh>;
1059         close $fh;
1060         unlink $hunkfile;
1061
1062         # Abort if nothing remains
1063         if (!grep { /\S/ } @newtext) {
1064                 return undef;
1065         }
1066
1067         # Reinsert the first hunk header if the user accidentally deleted it
1068         if ($newtext[0] !~ /^@/) {
1069                 unshift @newtext, $oldtext->[0];
1070         }
1071         return \@newtext;
1072 }
1073
1074 sub diff_applies {
1075         return run_git_apply($patch_mode_flavour{APPLY_CHECK} . ' --check',
1076                              map { @{$_->{TEXT}} } @_);
1077 }
1078
1079 sub _restore_terminal_and_die {
1080         ReadMode 'restore';
1081         print "\n";
1082         exit 1;
1083 }
1084
1085 sub prompt_single_character {
1086         if ($use_readkey) {
1087                 local $SIG{TERM} = \&_restore_terminal_and_die;
1088                 local $SIG{INT} = \&_restore_terminal_and_die;
1089                 ReadMode 'cbreak';
1090                 my $key = ReadKey 0;
1091                 ReadMode 'restore';
1092                 if ($use_termcap and $key eq "\e") {
1093                         while (!defined $term_escapes{$key}) {
1094                                 my $next = ReadKey 0.5;
1095                                 last if (!defined $next);
1096                                 $key .= $next;
1097                         }
1098                         $key =~ s/\e/^[/;
1099                 }
1100                 print "$key" if defined $key;
1101                 print "\n";
1102                 return $key;
1103         } else {
1104                 return <STDIN>;
1105         }
1106 }
1107
1108 sub prompt_yesno {
1109         my ($prompt) = @_;
1110         while (1) {
1111                 print colored $prompt_color, $prompt;
1112                 my $line = prompt_single_character;
1113                 return 0 if $line =~ /^n/i;
1114                 return 1 if $line =~ /^y/i;
1115         }
1116 }
1117
1118 sub edit_hunk_loop {
1119         my ($head, $hunk, $ix) = @_;
1120         my $text = $hunk->[$ix]->{TEXT};
1121
1122         while (1) {
1123                 $text = edit_hunk_manually($text);
1124                 if (!defined $text) {
1125                         return undef;
1126                 }
1127                 my $newhunk = {
1128                         TEXT => $text,
1129                         TYPE => $hunk->[$ix]->{TYPE},
1130                         USE => 1,
1131                         DIRTY => 1,
1132                 };
1133                 if (diff_applies($head,
1134                                  @{$hunk}[0..$ix-1],
1135                                  $newhunk,
1136                                  @{$hunk}[$ix+1..$#{$hunk}])) {
1137                         $newhunk->{DISPLAY} = [color_diff(@{$text})];
1138                         return $newhunk;
1139                 }
1140                 else {
1141                         prompt_yesno(
1142                                 'Your edited hunk does not apply. Edit again '
1143                                 . '(saying "no" discards!) [y/n]? '
1144                                 ) or return undef;
1145                 }
1146         }
1147 }
1148
1149 sub help_patch_cmd {
1150         my $verb = lc $patch_mode_flavour{VERB};
1151         my $target = $patch_mode_flavour{TARGET};
1152         print colored $help_color, <<EOF ;
1153 y - $verb this hunk$target
1154 n - do not $verb this hunk$target
1155 q - quit; do not $verb this hunk nor any of the remaining ones
1156 a - $verb this hunk and all later hunks in the file
1157 d - do not $verb this hunk nor any of the later hunks in the file
1158 g - select a hunk to go to
1159 / - search for a hunk matching the given regex
1160 j - leave this hunk undecided, see next undecided hunk
1161 J - leave this hunk undecided, see next hunk
1162 k - leave this hunk undecided, see previous undecided hunk
1163 K - leave this hunk undecided, see previous hunk
1164 s - split the current hunk into smaller hunks
1165 e - manually edit the current hunk
1166 ? - print help
1167 EOF
1168 }
1169
1170 sub apply_patch {
1171         my $cmd = shift;
1172         my $ret = run_git_apply $cmd, @_;
1173         if (!$ret) {
1174                 print STDERR @_;
1175         }
1176         return $ret;
1177 }
1178
1179 sub apply_patch_for_checkout_commit {
1180         my $reverse = shift;
1181         my $applies_index = run_git_apply 'apply '.$reverse.' --cached --check', @_;
1182         my $applies_worktree = run_git_apply 'apply '.$reverse.' --check', @_;
1183
1184         if ($applies_worktree && $applies_index) {
1185                 run_git_apply 'apply '.$reverse.' --cached', @_;
1186                 run_git_apply 'apply '.$reverse, @_;
1187                 return 1;
1188         } elsif (!$applies_index) {
1189                 print colored $error_color, "The selected hunks do not apply to the index!\n";
1190                 if (prompt_yesno "Apply them to the worktree anyway? ") {
1191                         return run_git_apply 'apply '.$reverse, @_;
1192                 } else {
1193                         print colored $error_color, "Nothing was applied.\n";
1194                         return 0;
1195                 }
1196         } else {
1197                 print STDERR @_;
1198                 return 0;
1199         }
1200 }
1201
1202 sub patch_update_cmd {
1203         my @all_mods = list_modified($patch_mode_flavour{FILTER});
1204         error_msg "ignoring unmerged: $_->{VALUE}\n"
1205                 for grep { $_->{UNMERGED} } @all_mods;
1206         @all_mods = grep { !$_->{UNMERGED} } @all_mods;
1207
1208         my @mods = grep { !($_->{BINARY}) } @all_mods;
1209         my @them;
1210
1211         if (!@mods) {
1212                 if (@all_mods) {
1213                         print STDERR "Only binary files changed.\n";
1214                 } else {
1215                         print STDERR "No changes.\n";
1216                 }
1217                 return 0;
1218         }
1219         if ($patch_mode) {
1220                 @them = @mods;
1221         }
1222         else {
1223                 @them = list_and_choose({ PROMPT => 'Patch update',
1224                                           HEADER => $status_head, },
1225                                         @mods);
1226         }
1227         for (@them) {
1228                 return 0 if patch_update_file($_->{VALUE});
1229         }
1230 }
1231
1232 # Generate a one line summary of a hunk.
1233 sub summarize_hunk {
1234         my $rhunk = shift;
1235         my $summary = $rhunk->{TEXT}[0];
1236
1237         # Keep the line numbers, discard extra context.
1238         $summary =~ s/@@(.*?)@@.*/$1 /s;
1239         $summary .= " " x (20 - length $summary);
1240
1241         # Add some user context.
1242         for my $line (@{$rhunk->{TEXT}}) {
1243                 if ($line =~ m/^[+-].*\w/) {
1244                         $summary .= $line;
1245                         last;
1246                 }
1247         }
1248
1249         chomp $summary;
1250         return substr($summary, 0, 80) . "\n";
1251 }
1252
1253
1254 # Print a one-line summary of each hunk in the array ref in
1255 # the first argument, starting with the index in the 2nd.
1256 sub display_hunks {
1257         my ($hunks, $i) = @_;
1258         my $ctr = 0;
1259         $i ||= 0;
1260         for (; $i < @$hunks && $ctr < 20; $i++, $ctr++) {
1261                 my $status = " ";
1262                 if (defined $hunks->[$i]{USE}) {
1263                         $status = $hunks->[$i]{USE} ? "+" : "-";
1264                 }
1265                 printf "%s%2d: %s",
1266                         $status,
1267                         $i + 1,
1268                         summarize_hunk($hunks->[$i]);
1269         }
1270         return $i;
1271 }
1272
1273 sub patch_update_file {
1274         my $quit = 0;
1275         my ($ix, $num);
1276         my $path = shift;
1277         my ($head, @hunk) = parse_diff($path);
1278         ($head, my $mode, my $deletion) = parse_diff_header($head);
1279         for (@{$head->{DISPLAY}}) {
1280                 print;
1281         }
1282
1283         if (@{$mode->{TEXT}}) {
1284                 unshift @hunk, $mode;
1285         }
1286         if (@{$deletion->{TEXT}}) {
1287                 foreach my $hunk (@hunk) {
1288                         push @{$deletion->{TEXT}}, @{$hunk->{TEXT}};
1289                         push @{$deletion->{DISPLAY}}, @{$hunk->{DISPLAY}};
1290                 }
1291                 @hunk = ($deletion);
1292         }
1293
1294         $num = scalar @hunk;
1295         $ix = 0;
1296
1297         while (1) {
1298                 my ($prev, $next, $other, $undecided, $i);
1299                 $other = '';
1300
1301                 if ($num <= $ix) {
1302                         $ix = 0;
1303                 }
1304                 for ($i = 0; $i < $ix; $i++) {
1305                         if (!defined $hunk[$i]{USE}) {
1306                                 $prev = 1;
1307                                 $other .= ',k';
1308                                 last;
1309                         }
1310                 }
1311                 if ($ix) {
1312                         $other .= ',K';
1313                 }
1314                 for ($i = $ix + 1; $i < $num; $i++) {
1315                         if (!defined $hunk[$i]{USE}) {
1316                                 $next = 1;
1317                                 $other .= ',j';
1318                                 last;
1319                         }
1320                 }
1321                 if ($ix < $num - 1) {
1322                         $other .= ',J';
1323                 }
1324                 if ($num > 1) {
1325                         $other .= ',g';
1326                 }
1327                 for ($i = 0; $i < $num; $i++) {
1328                         if (!defined $hunk[$i]{USE}) {
1329                                 $undecided = 1;
1330                                 last;
1331                         }
1332                 }
1333                 last if (!$undecided);
1334
1335                 if ($hunk[$ix]{TYPE} eq 'hunk' &&
1336                     hunk_splittable($hunk[$ix]{TEXT})) {
1337                         $other .= ',s';
1338                 }
1339                 if ($hunk[$ix]{TYPE} eq 'hunk') {
1340                         $other .= ',e';
1341                 }
1342                 for (@{$hunk[$ix]{DISPLAY}}) {
1343                         print;
1344                 }
1345                 print colored $prompt_color, $patch_mode_flavour{VERB},
1346                   ($hunk[$ix]{TYPE} eq 'mode' ? ' mode change' :
1347                    $hunk[$ix]{TYPE} eq 'deletion' ? ' deletion' :
1348                    ' this hunk'),
1349                   $patch_mode_flavour{TARGET},
1350                   " [y,n,q,a,d,/$other,?]? ";
1351                 my $line = prompt_single_character;
1352                 if ($line) {
1353                         if ($line =~ /^y/i) {
1354                                 $hunk[$ix]{USE} = 1;
1355                         }
1356                         elsif ($line =~ /^n/i) {
1357                                 $hunk[$ix]{USE} = 0;
1358                         }
1359                         elsif ($line =~ /^a/i) {
1360                                 while ($ix < $num) {
1361                                         if (!defined $hunk[$ix]{USE}) {
1362                                                 $hunk[$ix]{USE} = 1;
1363                                         }
1364                                         $ix++;
1365                                 }
1366                                 next;
1367                         }
1368                         elsif ($other =~ /g/ && $line =~ /^g(.*)/) {
1369                                 my $response = $1;
1370                                 my $no = $ix > 10 ? $ix - 10 : 0;
1371                                 while ($response eq '') {
1372                                         my $extra = "";
1373                                         $no = display_hunks(\@hunk, $no);
1374                                         if ($no < $num) {
1375                                                 $extra = " (<ret> to see more)";
1376                                         }
1377                                         print "go to which hunk$extra? ";
1378                                         $response = <STDIN>;
1379                                         if (!defined $response) {
1380                                                 $response = '';
1381                                         }
1382                                         chomp $response;
1383                                 }
1384                                 if ($response !~ /^\s*\d+\s*$/) {
1385                                         error_msg "Invalid number: '$response'\n";
1386                                 } elsif (0 < $response && $response <= $num) {
1387                                         $ix = $response - 1;
1388                                 } else {
1389                                         error_msg "Sorry, only $num hunks available.\n";
1390                                 }
1391                                 next;
1392                         }
1393                         elsif ($line =~ /^d/i) {
1394                                 while ($ix < $num) {
1395                                         if (!defined $hunk[$ix]{USE}) {
1396                                                 $hunk[$ix]{USE} = 0;
1397                                         }
1398                                         $ix++;
1399                                 }
1400                                 next;
1401                         }
1402                         elsif ($line =~ /^q/i) {
1403                                 for ($i = 0; $i < $num; $i++) {
1404                                         if (!defined $hunk[$i]{USE}) {
1405                                                 $hunk[$i]{USE} = 0;
1406                                         }
1407                                 }
1408                                 $quit = 1;
1409                                 last;
1410                         }
1411                         elsif ($line =~ m|^/(.*)|) {
1412                                 my $regex = $1;
1413                                 if ($1 eq "") {
1414                                         print colored $prompt_color, "search for regex? ";
1415                                         $regex = <STDIN>;
1416                                         if (defined $regex) {
1417                                                 chomp $regex;
1418                                         }
1419                                 }
1420                                 my $search_string;
1421                                 eval {
1422                                         $search_string = qr{$regex}m;
1423                                 };
1424                                 if ($@) {
1425                                         my ($err,$exp) = ($@, $1);
1426                                         $err =~ s/ at .*git-add--interactive line \d+, <STDIN> line \d+.*$//;
1427                                         error_msg "Malformed search regexp $exp: $err\n";
1428                                         next;
1429                                 }
1430                                 my $iy = $ix;
1431                                 while (1) {
1432                                         my $text = join ("", @{$hunk[$iy]{TEXT}});
1433                                         last if ($text =~ $search_string);
1434                                         $iy++;
1435                                         $iy = 0 if ($iy >= $num);
1436                                         if ($ix == $iy) {
1437                                                 error_msg "No hunk matches the given pattern\n";
1438                                                 last;
1439                                         }
1440                                 }
1441                                 $ix = $iy;
1442                                 next;
1443                         }
1444                         elsif ($line =~ /^K/) {
1445                                 if ($other =~ /K/) {
1446                                         $ix--;
1447                                 }
1448                                 else {
1449                                         error_msg "No previous hunk\n";
1450                                 }
1451                                 next;
1452                         }
1453                         elsif ($line =~ /^J/) {
1454                                 if ($other =~ /J/) {
1455                                         $ix++;
1456                                 }
1457                                 else {
1458                                         error_msg "No next hunk\n";
1459                                 }
1460                                 next;
1461                         }
1462                         elsif ($line =~ /^k/) {
1463                                 if ($other =~ /k/) {
1464                                         while (1) {
1465                                                 $ix--;
1466                                                 last if (!$ix ||
1467                                                          !defined $hunk[$ix]{USE});
1468                                         }
1469                                 }
1470                                 else {
1471                                         error_msg "No previous hunk\n";
1472                                 }
1473                                 next;
1474                         }
1475                         elsif ($line =~ /^j/) {
1476                                 if ($other !~ /j/) {
1477                                         error_msg "No next hunk\n";
1478                                         next;
1479                                 }
1480                         }
1481                         elsif ($other =~ /s/ && $line =~ /^s/) {
1482                                 my @split = split_hunk($hunk[$ix]{TEXT}, $hunk[$ix]{DISPLAY});
1483                                 if (1 < @split) {
1484                                         print colored $header_color, "Split into ",
1485                                         scalar(@split), " hunks.\n";
1486                                 }
1487                                 splice (@hunk, $ix, 1, @split);
1488                                 $num = scalar @hunk;
1489                                 next;
1490                         }
1491                         elsif ($other =~ /e/ && $line =~ /^e/) {
1492                                 my $newhunk = edit_hunk_loop($head, \@hunk, $ix);
1493                                 if (defined $newhunk) {
1494                                         splice @hunk, $ix, 1, $newhunk;
1495                                 }
1496                         }
1497                         else {
1498                                 help_patch_cmd($other);
1499                                 next;
1500                         }
1501                         # soft increment
1502                         while (1) {
1503                                 $ix++;
1504                                 last if ($ix >= $num ||
1505                                          !defined $hunk[$ix]{USE});
1506                         }
1507                 }
1508         }
1509
1510         @hunk = coalesce_overlapping_hunks(@hunk);
1511
1512         my $n_lofs = 0;
1513         my @result = ();
1514         for (@hunk) {
1515                 if ($_->{USE}) {
1516                         push @result, @{$_->{TEXT}};
1517                 }
1518         }
1519
1520         if (@result) {
1521                 my @patch = reassemble_patch($head->{TEXT}, @result);
1522                 my $apply_routine = $patch_mode_flavour{APPLY};
1523                 &$apply_routine(@patch);
1524                 refresh();
1525         }
1526
1527         print "\n";
1528         return $quit;
1529 }
1530
1531 sub diff_cmd {
1532         my @mods = list_modified('index-only');
1533         @mods = grep { !($_->{BINARY}) } @mods;
1534         return if (!@mods);
1535         my (@them) = list_and_choose({ PROMPT => 'Review diff',
1536                                      IMMEDIATE => 1,
1537                                      HEADER => $status_head, },
1538                                    @mods);
1539         return if (!@them);
1540         my $reference = is_initial_commit() ? get_empty_tree() : 'HEAD';
1541         system(qw(git diff -p --cached), $reference, '--',
1542                 map { $_->{VALUE} } @them);
1543 }
1544
1545 sub quit_cmd {
1546         print "Bye.\n";
1547         exit(0);
1548 }
1549
1550 sub help_cmd {
1551         print colored $help_color, <<\EOF ;
1552 status        - show paths with changes
1553 update        - add working tree state to the staged set of changes
1554 revert        - revert staged set of changes back to the HEAD version
1555 patch         - pick hunks and update selectively
1556 diff          - view diff between HEAD and index
1557 add untracked - add contents of untracked files to the staged set of changes
1558 EOF
1559 }
1560
1561 sub process_args {
1562         return unless @ARGV;
1563         my $arg = shift @ARGV;
1564         if ($arg =~ /--patch(?:=(.*))?/) {
1565                 if (defined $1) {
1566                         if ($1 eq 'reset') {
1567                                 $patch_mode = 'reset_head';
1568                                 $patch_mode_revision = 'HEAD';
1569                                 $arg = shift @ARGV or die "missing --";
1570                                 if ($arg ne '--') {
1571                                         $patch_mode_revision = $arg;
1572                                         $patch_mode = ($arg eq 'HEAD' ?
1573                                                        'reset_head' : 'reset_nothead');
1574                                         $arg = shift @ARGV or die "missing --";
1575                                 }
1576                         } elsif ($1 eq 'checkout') {
1577                                 $arg = shift @ARGV or die "missing --";
1578                                 if ($arg eq '--') {
1579                                         $patch_mode = 'checkout_index';
1580                                 } else {
1581                                         $patch_mode_revision = $arg;
1582                                         $patch_mode = ($arg eq 'HEAD' ?
1583                                                        'checkout_head' : 'checkout_nothead');
1584                                         $arg = shift @ARGV or die "missing --";
1585                                 }
1586                         } elsif ($1 eq 'stage' or $1 eq 'stash') {
1587                                 $patch_mode = $1;
1588                                 $arg = shift @ARGV or die "missing --";
1589                         } else {
1590                                 die "unknown --patch mode: $1";
1591                         }
1592                 } else {
1593                         $patch_mode = 'stage';
1594                         $arg = shift @ARGV or die "missing --";
1595                 }
1596                 die "invalid argument $arg, expecting --"
1597                     unless $arg eq "--";
1598                 %patch_mode_flavour = %{$patch_modes{$patch_mode}};
1599         }
1600         elsif ($arg ne "--") {
1601                 die "invalid argument $arg, expecting --";
1602         }
1603 }
1604
1605 sub main_loop {
1606         my @cmd = ([ 'status', \&status_cmd, ],
1607                    [ 'update', \&update_cmd, ],
1608                    [ 'revert', \&revert_cmd, ],
1609                    [ 'add untracked', \&add_untracked_cmd, ],
1610                    [ 'patch', \&patch_update_cmd, ],
1611                    [ 'diff', \&diff_cmd, ],
1612                    [ 'quit', \&quit_cmd, ],
1613                    [ 'help', \&help_cmd, ],
1614         );
1615         while (1) {
1616                 my ($it) = list_and_choose({ PROMPT => 'What now',
1617                                              SINGLETON => 1,
1618                                              LIST_FLAT => 4,
1619                                              HEADER => '*** Commands ***',
1620                                              ON_EOF => \&quit_cmd,
1621                                              IMMEDIATE => 1 }, @cmd);
1622                 if ($it) {
1623                         eval {
1624                                 $it->[1]->();
1625                         };
1626                         if ($@) {
1627                                 print "$@";
1628                         }
1629                 }
1630         }
1631 }
1632
1633 process_args();
1634 refresh();
1635 if ($patch_mode) {
1636         patch_update_cmd();
1637 }
1638 else {
1639         status_cmd();
1640         main_loop();
1641 }