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                 $use_readkey = 1;
  60         };
  61         if (!$use_readkey) {
  62                 print STDERR "missing Term::ReadKey, disabling interactive.singlekey\n";
  63         }
  64         eval {
  65                 require Term::Cap;
  66                 my $termcap = Term::Cap->Tgetent;
  67                 foreach (values %$termcap) {
  68                         $term_escapes{$_} = 1 if /^\e/;
  69                 }
  70                 $use_termcap = 1;
  71         };
  72 }
  73
  74 sub colored {
  75         my $color = shift;
  76         my $string = join("", @_);
  77
  78         if (defined $color) {
  79                 # Put a color code at the beginning of each line, a reset at the end
  80                 # color after newlines that are not at the end of the string
  81                 $string =~ s/(\n+)(.)/$1$color$2/g;
  82                 # reset before newlines
  83                 $string =~ s/(\n+)/$normal_color$1/g;
  84                 # codes at beginning and end (if necessary):
  85                 $string =~ s/^/$color/;
  86                 $string =~ s/$/$normal_color/ unless $string =~ /\n$/;
  87         }
  88         return $string;
  89 }
  90
  91 # command line options
  92 my $patch_mode;
  93 my $patch_mode_revision;
  94
  95 sub apply_patch;
  96 sub apply_patch_for_checkout_commit;
  97 sub apply_patch_for_stash;
  98
  99 my %patch_modes = (
 100         'stage' => {
 101                 DIFF => 'diff-files -p',
 102                 APPLY => sub { apply_patch 'apply --cached', @_; },
 103                 APPLY_CHECK => 'apply --cached',
 104                 VERB => 'Stage',
 105                 TARGET => '',
 106                 PARTICIPLE => 'staging',
 107                 FILTER => 'file-only',
 108                 IS_REVERSE => 0,
 109         },
 110         'stash' => {
 111                 DIFF => 'diff-index -p HEAD',
 112                 APPLY => sub { apply_patch 'apply --cached', @_; },
 113                 APPLY_CHECK => 'apply --cached',
 114                 VERB => 'Stash',
 115                 TARGET => '',
 116                 PARTICIPLE => 'stashing',
 117                 FILTER => undef,
 118                 IS_REVERSE => 0,
 119         },
 120         'reset_head' => {
 121                 DIFF => 'diff-index -p --cached',
 122                 APPLY => sub { apply_patch 'apply -R --cached', @_; },
 123                 APPLY_CHECK => 'apply -R --cached',
 124                 VERB => 'Unstage',
 125                 TARGET => '',
 126                 PARTICIPLE => 'unstaging',
 127                 FILTER => 'index-only',
 128                 IS_REVERSE => 1,
 129         },
 130         'reset_nothead' => {
 131                 DIFF => 'diff-index -R -p --cached',
 132                 APPLY => sub { apply_patch 'apply --cached', @_; },
 133                 APPLY_CHECK => 'apply --cached',
 134                 VERB => 'Apply',
 135                 TARGET => ' to index',
 136                 PARTICIPLE => 'applying',
 137                 FILTER => 'index-only',
 138                 IS_REVERSE => 0,
 139         },
 140         'checkout_index' => {
 141                 DIFF => 'diff-files -p',
 142                 APPLY => sub { apply_patch 'apply -R', @_; },
 143                 APPLY_CHECK => 'apply -R',
 144                 VERB => 'Discard',
 145                 TARGET => ' from worktree',
 146                 PARTICIPLE => 'discarding',
 147                 FILTER => 'file-only',
 148                 IS_REVERSE => 1,
 149         },
 150         'checkout_head' => {
 151                 DIFF => 'diff-index -p',
 152                 APPLY => sub { apply_patch_for_checkout_commit '-R', @_ },
 153                 APPLY_CHECK => 'apply -R',
 154                 VERB => 'Discard',
 155                 TARGET => ' from index and worktree',
 156                 PARTICIPLE => 'discarding',
 157                 FILTER => undef,
 158                 IS_REVERSE => 1,
 159         },
 160         'checkout_nothead' => {
 161                 DIFF => 'diff-index -R -p',
 162                 APPLY => sub { apply_patch_for_checkout_commit '', @_ },
 163                 APPLY_CHECK => 'apply',
 164                 VERB => 'Apply',
 165                 TARGET => ' to index and worktree',
 166                 PARTICIPLE => 'applying',
 167                 FILTER => undef,
 168                 IS_REVERSE => 0,
 169         },
 170 );
 171
 172 my %patch_mode_flavour = %{$patch_modes{stage}};
 173
 174 sub run_cmd_pipe {
 175         if ($^O eq 'MSWin32') {
 176                 my @invalid = grep {m/[":*]/} @_;
 177                 die "$^O does not support: @invalid\n" if @invalid;
 178                 my @args = map { m/ /o ? "\"$_\"": $_ } @_;
 179                 return qx{@args};
 180         } else {
 181                 my $fh = undef;
 182                 open($fh, '-|', @_) or die;
 183                 return <$fh>;
 184         }
 185 }
 186
 187 my ($GIT_DIR) = run_cmd_pipe(qw(git rev-parse --git-dir));
 188
 189 if (!defined $GIT_DIR) {
 190         exit(1); # rev-parse would have already said "not a git repo"
 191 }
 192 chomp($GIT_DIR);
 193
 194 my %cquote_map = (
 195  "b" => chr(8),
 196  "t" => chr(9),
 197  "n" => chr(10),
 198  "v" => chr(11),
 199  "f" => chr(12),
 200  "r" => chr(13),
 201  "\\" => "\\",
 202  "\042" => "\042",
 203 );
 204
 205 sub unquote_path {
 206         local ($_) = @_;
 207         my ($retval, $remainder);
 208         if (!/^\042(.*)\042$/) {
 209                 return $_;
 210         }
 211         ($_, $retval) = ($1, "");
 212         while (/^([^\\]*)\\(.*)$/) {
 213                 $remainder = $2;
 214                 $retval .= $1;
 215                 for ($remainder) {
 216                         if (/^([0-3][0-7][0-7])(.*)$/) {
 217                                 $retval .= chr(oct($1));
 218                                 $_ = $2;
 219                                 last;
 220                         }
 221                         if (/^([\\\042btnvfr])(.*)$/) {
 222                                 $retval .= $cquote_map{$1};
 223                                 $_ = $2;
 224                                 last;
 225                         }
 226                         # This is malformed -- just return it as-is for now.
 227                         return $_[0];
 228                 }
 229                 $_ = $remainder;
 230         }
 231         $retval .= $_;
 232         return $retval;
 233 }
 234
 235 sub refresh {
 236         my $fh;
 237         open $fh, 'git update-index --refresh |'
 238             or die;
 239         while (<$fh>) {
 240                 ;# ignore 'needs update'
 241         }
 242         close $fh;
 243 }
 244
 245 sub list_untracked {
 246         map {
 247                 chomp $_;
 248                 unquote_path($_);
 249         }
 250         run_cmd_pipe(qw(git ls-files --others --exclude-standard --), @ARGV);
 251 }
 252
 253 my $status_fmt = '%12s %12s %s';
 254 my $status_head = sprintf($status_fmt, 'staged', 'unstaged', 'path');
 255
 256 {
 257         my $initial;
 258         sub is_initial_commit {
 259                 $initial = system('git rev-parse HEAD -- >/dev/null 2>&1') != 0
 260                         unless defined $initial;
 261                 return $initial;
 262         }
 263 }
 264
 265 sub get_empty_tree {
 266         return '4b825dc642cb6eb9a060e54bf8d69288fbee4904';
 267 }
 268
 269 sub get_diff_reference {
 270         my $ref = shift;
 271         if (defined $ref and $ref ne 'HEAD') {
 272                 return $ref;
 273         } elsif (is_initial_commit()) {
 274                 return get_empty_tree();
 275         } else {
 276                 return 'HEAD';
 277         }
 278 }
 279
 280 # Returns list of hashes, contents of each of which are:
 281 # VALUE:        pathname
 282 # BINARY:       is a binary path
 283 # INDEX:        is index different from HEAD?
 284 # FILE:         is file different from index?
 285 # INDEX_ADDDEL: is it add/delete between HEAD and index?
 286 # FILE_ADDDEL:  is it add/delete between index and file?
 287 # UNMERGED:     is the path unmerged
 288
 289 sub list_modified {
 290         my ($only) = @_;
 291         my (%data, @return);
 292         my ($add, $del, $adddel, $file);
 293         my @tracked = ();
 294
 295         if (@ARGV) {
 296                 @tracked = map {
 297                         chomp $_;
 298                         unquote_path($_);
 299                 } run_cmd_pipe(qw(git ls-files --), @ARGV);
 300                 return if (!@tracked);
 301         }
 302
 303         my $reference = get_diff_reference($patch_mode_revision);
 304         for (run_cmd_pipe(qw(git diff-index --cached
 305                              --numstat --summary), $reference,
 306                              '--', @tracked)) {
 307                 if (($add, $del, $file) =
 308                     /^([-\d]+)  ([-\d]+)        (.*)/) {
 309                         my ($change, $bin);
 310                         $file = unquote_path($file);
 311                         if ($add eq '-' && $del eq '-') {
 312                                 $change = 'binary';
 313                                 $bin = 1;
 314                         }
 315                         else {
 316                                 $change = "+$add/-$del";
 317                         }
 318                         $data{$file} = {
 319                                 INDEX => $change,
 320                                 BINARY => $bin,
 321                                 FILE => 'nothing',
 322                         }
 323                 }
 324                 elsif (($adddel, $file) =
 325                        /^ (create|delete) mode [0-7]+ (.*)$/) {
 326                         $file = unquote_path($file);
 327                         $data{$file}{INDEX_ADDDEL} = $adddel;
 328                 }
 329         }
 330
 331         for (run_cmd_pipe(qw(git diff-files --numstat --summary --raw --), @tracked)) {
 332                 if (($add, $del, $file) =
 333                     /^([-\d]+)  ([-\d]+)        (.*)/) {
 334                         $file = unquote_path($file);
 335                         my ($change, $bin);
 336                         if ($add eq '-' && $del eq '-') {
 337                                 $change = 'binary';
 338                                 $bin = 1;
 339                         }
 340                         else {
 341                                 $change = "+$add/-$del";
 342                         }
 343                         $data{$file}{FILE} = $change;
 344                         if ($bin) {
 345                                 $data{$file}{BINARY} = 1;
 346                         }
 347                 }
 348                 elsif (($adddel, $file) =
 349                        /^ (create|delete) mode [0-7]+ (.*)$/) {
 350                         $file = unquote_path($file);
 351                         $data{$file}{FILE_ADDDEL} = $adddel;
 352                 }
 353                 elsif (/^:[0-7]+ [0-7]+ [0-9a-f]+ [0-9a-f]+ (.) (.*)$/) {
 354                         $file = unquote_path($2);
 355                         if (!exists $data{$file}) {
 356                                 $data{$file} = +{
 357                                         INDEX => 'unchanged',
 358                                         BINARY => 0,
 359                                 };
 360                         }
 361                         if ($1 eq 'U') {
 362                                 $data{$file}{UNMERGED} = 1;
 363                         }
 364                 }
 365         }
 366
 367         for (sort keys %data) {
 368                 my $it = $data{$_};
 369
 370                 if ($only) {
 371                         if ($only eq 'index-only') {
 372                                 next if ($it->{INDEX} eq 'unchanged');
 373                         }
 374                         if ($only eq 'file-only') {
 375                                 next if ($it->{FILE} eq 'nothing');
 376                         }
 377                 }
 378                 push @return, +{
 379                         VALUE => $_,
 380                         %$it,
 381                 };
 382         }
 383         return @return;
 384 }
 385
 386 sub find_unique {
 387         my ($string, @stuff) = @_;
 388         my $found = undef;
 389         for (my $i = 0; $i < @stuff; $i++) {
 390                 my $it = $stuff[$i];
 391                 my $hit = undef;
 392                 if (ref $it) {
 393                         if ((ref $it) eq 'ARRAY') {
 394                                 $it = $it->[0];
 395                         }
 396                         else {
 397                                 $it = $it->{VALUE};
 398                         }
 399                 }
 400                 eval {
 401                         if ($it =~ /^$string/) {
 402                                 $hit = 1;
 403                         };
 404                 };
 405                 if (defined $hit && defined $found) {
 406                         return undef;
 407                 }
 408                 if ($hit) {
 409                         $found = $i + 1;
 410                 }
 411         }
 412         return $found;
 413 }
 414
 415 # inserts string into trie and updates count for each character
 416 sub update_trie {
 417         my ($trie, $string) = @_;
 418         foreach (split //, $string) {
 419                 $trie = $trie->{$_} ||= {COUNT => 0};
 420                 $trie->{COUNT}++;
 421         }
 422 }
 423
 424 # returns an array of tuples (prefix, remainder)
 425 sub find_unique_prefixes {
 426         my @stuff = @_;
 427         my @return = ();
 428
 429         # any single prefix exceeding the soft limit is omitted
 430         # if any prefix exceeds the hard limit all are omitted
 431         # 0 indicates no limit
 432         my $soft_limit = 0;
 433         my $hard_limit = 3;
 434
 435         # build a trie modelling all possible options
 436         my %trie;
 437         foreach my $print (@stuff) {
 438                 if ((ref $print) eq 'ARRAY') {
 439                         $print = $print->[0];
 440                 }
 441                 elsif ((ref $print) eq 'HASH') {
 442                         $print = $print->{VALUE};
 443                 }
 444                 update_trie(\%trie, $print);
 445                 push @return, $print;
 446         }
 447
 448         # use the trie to find the unique prefixes
 449         for (my $i = 0; $i < @return; $i++) {
 450                 my $ret = $return[$i];
 451                 my @letters = split //, $ret;
 452                 my %search = %trie;
 453                 my ($prefix, $remainder);
 454                 my $j;
 455                 for ($j = 0; $j < @letters; $j++) {
 456                         my $letter = $letters[$j];
 457                         if ($search{$letter}{COUNT} == 1) {
 458                                 $prefix = substr $ret, 0, $j + 1;
 459                                 $remainder = substr $ret, $j + 1;
 460                                 last;
 461                         }
 462                         else {
 463                                 my $prefix = substr $ret, 0, $j;
 464                                 return ()
 465                                     if ($hard_limit && $j + 1 > $hard_limit);
 466                         }
 467                         %search = %{$search{$letter}};
 468                 }
 469                 if (ord($letters[0]) > 127 ||
 470                     ($soft_limit && $j + 1 > $soft_limit)) {
 471                         $prefix = undef;
 472                         $remainder = $ret;
 473                 }
 474                 $return[$i] = [$prefix, $remainder];
 475         }
 476         return @return;
 477 }
 478
 479 # filters out prefixes which have special meaning to list_and_choose()
 480 sub is_valid_prefix {
 481         my $prefix = shift;
 482         return (defined $prefix) &&
 483             !($prefix =~ /[\s,]/) && # separators
 484             !($prefix =~ /^-/) &&    # deselection
 485             !($prefix =~ /^\d+/) &&  # selection
 486             ($prefix ne '*') &&      # "all" wildcard
 487             ($prefix ne '?');        # prompt help
 488 }
 489
 490 # given a prefix/remainder tuple return a string with the prefix highlighted
 491 # for now use square brackets; later might use ANSI colors (underline, bold)
 492 sub highlight_prefix {
 493         my $prefix = shift;
 494         my $remainder = shift;
 495
 496         if (!defined $prefix) {
 497                 return $remainder;
 498         }
 499
 500         if (!is_valid_prefix($prefix)) {
 501                 return "$prefix$remainder";
 502         }
 503
 504         if (!$menu_use_color) {
 505                 return "[$prefix]$remainder";
 506         }
 507
 508         return "$prompt_color$prefix$normal_color$remainder";
 509 }
 510
 511 sub error_msg {
 512         print STDERR colored $error_color, @_;
 513 }
 514
 515 sub list_and_choose {
 516         my ($opts, @stuff) = @_;
 517         my (@chosen, @return);
 518         my $i;
 519         my @prefixes = find_unique_prefixes(@stuff) unless $opts->{LIST_ONLY};
 520
 521       TOPLOOP:
 522         while (1) {
 523                 my $last_lf = 0;
 524
 525                 if ($opts->{HEADER}) {
 526                         if (!$opts->{LIST_FLAT}) {
 527                                 print "     ";
 528                         }
 529                         print colored $header_color, "$opts->{HEADER}\n";
 530                 }
 531                 for ($i = 0; $i < @stuff; $i++) {
 532                         my $chosen = $chosen[$i] ? '*' : ' ';
 533                         my $print = $stuff[$i];
 534                         my $ref = ref $print;
 535                         my $highlighted = highlight_prefix(@{$prefixes[$i]})
 536                             if @prefixes;
 537                         if ($ref eq 'ARRAY') {
 538                                 $print = $highlighted || $print->[0];
 539                         }
 540                         elsif ($ref eq 'HASH') {
 541                                 my $value = $highlighted || $print->{VALUE};
 542                                 $print = sprintf($status_fmt,
 543                                     $print->{INDEX},
 544                                     $print->{FILE},
 545                                     $value);
 546                         }
 547                         else {
 548                                 $print = $highlighted || $print;
 549                         }
 550                         printf("%s%2d: %s", $chosen, $i+1, $print);
 551                         if (($opts->{LIST_FLAT}) &&
 552                             (($i + 1) % ($opts->{LIST_FLAT}))) {
 553                                 print "\t";
 554                                 $last_lf = 0;
 555                         }
 556                         else {
 557                                 print "\n";
 558                                 $last_lf = 1;
 559                         }
 560                 }
 561                 if (!$last_lf) {
 562                         print "\n";
 563                 }
 564
 565                 return if ($opts->{LIST_ONLY});
 566
 567                 print colored $prompt_color, $opts->{PROMPT};
 568                 if ($opts->{SINGLETON}) {
 569                         print "> ";
 570                 }
 571                 else {
 572                         print ">> ";
 573                 }
 574                 my $line = <STDIN>;
 575                 if (!$line) {
 576                         print "\n";
 577                         $opts->{ON_EOF}->() if $opts->{ON_EOF};
 578                         last;
 579                 }
 580                 chomp $line;
 581                 last if $line eq '';
 582                 if ($line eq '?') {
 583                         $opts->{SINGLETON} ?
 584                             singleton_prompt_help_cmd() :
 585                             prompt_help_cmd();
 586                         next TOPLOOP;
 587                 }
 588                 for my $choice (split(/[\s,]+/, $line)) {
 589                         my $choose = 1;
 590                         my ($bottom, $top);
 591
 592                         # Input that begins with '-'; unchoose
 593                         if ($choice =~ s/^-//) {
 594                                 $choose = 0;
 595                         }
 596                         # A range can be specified like 5-7 or 5-.
 597                         if ($choice =~ /^(\d+)-(\d*)$/) {
 598                                 ($bottom, $top) = ($1, length($2) ? $2 : 1 + @stuff);
 599                         }
 600                         elsif ($choice =~ /^\d+$/) {
 601                                 $bottom = $top = $choice;
 602                         }
 603                         elsif ($choice eq '*') {
 604                                 $bottom = 1;
 605                                 $top = 1 + @stuff;
 606                         }
 607                         else {
 608                                 $bottom = $top = find_unique($choice, @stuff);
 609                                 if (!defined $bottom) {
 610                                         error_msg "Huh ($choice)?\n";
 611                                         next TOPLOOP;
 612                                 }
 613                         }
 614                         if ($opts->{SINGLETON} && $bottom != $top) {
 615                                 error_msg "Huh ($choice)?\n";
 616                                 next TOPLOOP;
 617                         }
 618                         for ($i = $bottom-1; $i <= $top-1; $i++) {
 619                                 next if (@stuff <= $i || $i < 0);
 620                                 $chosen[$i] = $choose;
 621                         }
 622                 }
 623                 last if ($opts->{IMMEDIATE} || $line eq '*');
 624         }
 625         for ($i = 0; $i < @stuff; $i++) {
 626                 if ($chosen[$i]) {
 627                         push @return, $stuff[$i];
 628                 }
 629         }
 630         return @return;
 631 }
 632
 633 sub singleton_prompt_help_cmd {
 634         print colored $help_color, <<\EOF ;
 635 Prompt help:
 636 1          - select a numbered item
 637 foo        - select item based on unique prefix
 638            - (empty) select nothing
 639 EOF
 640 }
 641
 642 sub prompt_help_cmd {
 643         print colored $help_color, <<\EOF ;
 644 Prompt help:
 645 1          - select a single item
 646 3-5        - select a range of items
 647 2-3,6-9    - select multiple ranges
 648 foo        - select item based on unique prefix
 649 -...       - unselect specified items
 650 *          - choose all items
 651            - (empty) finish selecting
 652 EOF
 653 }
 654
 655 sub status_cmd {
 656         list_and_choose({ LIST_ONLY => 1, HEADER => $status_head },
 657                         list_modified());
 658         print "\n";
 659 }
 660
 661 sub say_n_paths {
 662         my $did = shift @_;
 663         my $cnt = scalar @_;
 664         print "$did ";
 665         if (1 < $cnt) {
 666                 print "$cnt paths\n";
 667         }
 668         else {
 669                 print "one path\n";
 670         }
 671 }
 672
 673 sub update_cmd {
 674         my @mods = list_modified('file-only');
 675         return if (!@mods);
 676
 677         my @update = list_and_choose({ PROMPT => 'Update',
 678                                        HEADER => $status_head, },
 679                                      @mods);
 680         if (@update) {
 681                 system(qw(git update-index --add --remove --),
 682                        map { $_->{VALUE} } @update);
 683                 say_n_paths('updated', @update);
 684         }
 685         print "\n";
 686 }
 687
 688 sub revert_cmd {
 689         my @update = list_and_choose({ PROMPT => 'Revert',
 690                                        HEADER => $status_head, },
 691                                      list_modified());
 692         if (@update) {
 693                 if (is_initial_commit()) {
 694                         system(qw(git rm --cached),
 695                                 map { $_->{VALUE} } @update);
 696                 }
 697                 else {
 698                         my @lines = run_cmd_pipe(qw(git ls-tree HEAD --),
 699                                                  map { $_->{VALUE} } @update);
 700                         my $fh;
 701                         open $fh, '| git update-index --index-info'
 702                             or die;
 703                         for (@lines) {
 704                                 print $fh $_;
 705                         }
 706                         close($fh);
 707                         for (@update) {
 708                                 if ($_->{INDEX_ADDDEL} &&
 709                                     $_->{INDEX_ADDDEL} eq 'create') {
 710                                         system(qw(git update-index --force-remove --),
 711                                                $_->{VALUE});
 712                                         print "note: $_->{VALUE} is untracked now.\n";
 713                                 }
 714                         }
 715                 }
 716                 refresh();
 717                 say_n_paths('reverted', @update);
 718         }
 719         print "\n";
 720 }
 721
 722 sub add_untracked_cmd {
 723         my @add = list_and_choose({ PROMPT => 'Add untracked' },
 724                                   list_untracked());
 725         if (@add) {
 726                 system(qw(git update-index --add --), @add);
 727                 say_n_paths('added', @add);
 728         }
 729         print "\n";
 730 }
 731
 732 sub run_git_apply {
 733         my $cmd = shift;
 734         my $fh;
 735         open $fh, '| git ' . $cmd . " --recount --allow-overlap";
 736         print $fh @_;
 737         return close $fh;
 738 }
 739
 740 sub parse_diff {
 741         my ($path) = @_;
 742         my @diff_cmd = split(" ", $patch_mode_flavour{DIFF});
 743         if (defined $diff_algorithm) {
 744                 splice @diff_cmd, 1, 0, "--diff-algorithm=${diff_algorithm}";
 745         }
 746         if (defined $patch_mode_revision) {
 747                 push @diff_cmd, get_diff_reference($patch_mode_revision);
 748         }
 749         my @diff = run_cmd_pipe("git", @diff_cmd, "--", $path);
 750         my @colored = ();
 751         if ($diff_use_color) {
 752                 @colored = run_cmd_pipe("git", @diff_cmd, qw(--color --), $path);
 753         }
 754         my (@hunk) = { TEXT => [], DISPLAY => [], TYPE => 'header' };
 755
 756         for (my $i = 0; $i < @diff; $i++) {
 757                 if ($diff[$i] =~ /^@@ /) {
 758                         push @hunk, { TEXT => [], DISPLAY => [],
 759                                 TYPE => 'hunk' };
 760                 }
 761                 push @{$hunk[-1]{TEXT}}, $diff[$i];
 762                 push @{$hunk[-1]{DISPLAY}},
 763                         ($diff_use_color ? $colored[$i] : $diff[$i]);
 764         }
 765         return @hunk;
 766 }
 767
 768 sub parse_diff_header {
 769         my $src = shift;
 770
 771         my $head = { TEXT => [], DISPLAY => [], TYPE => 'header' };
 772         my $mode = { TEXT => [], DISPLAY => [], TYPE => 'mode' };
 773         my $deletion = { TEXT => [], DISPLAY => [], TYPE => 'deletion' };
 774
 775         for (my $i = 0; $i < @{$src->{TEXT}}; $i++) {
 776                 my $dest =
 777                    $src->{TEXT}->[$i] =~ /^(old|new) mode (\d+)$/ ? $mode :
 778                    $src->{TEXT}->[$i] =~ /^deleted file/ ? $deletion :
 779                    $head;
 780                 push @{$dest->{TEXT}}, $src->{TEXT}->[$i];
 781                 push @{$dest->{DISPLAY}}, $src->{DISPLAY}->[$i];
 782         }
 783         return ($head, $mode, $deletion);
 784 }
 785
 786 sub hunk_splittable {
 787         my ($text) = @_;
 788
 789         my @s = split_hunk($text);
 790         return (1 < @s);
 791 }
 792
 793 sub parse_hunk_header {
 794         my ($line) = @_;
 795         my ($o_ofs, $o_cnt, $n_ofs, $n_cnt) =
 796             $line =~ /^@@ -(\d+)(?:,(\d+))? \+(\d+)(?:,(\d+))? @@/;
 797         $o_cnt = 1 unless defined $o_cnt;
 798         $n_cnt = 1 unless defined $n_cnt;
 799         return ($o_ofs, $o_cnt, $n_ofs, $n_cnt);
 800 }
 801
 802 sub split_hunk {
 803         my ($text, $display) = @_;
 804         my @split = ();
 805         if (!defined $display) {
 806                 $display = $text;
 807         }
 808         # If there are context lines in the middle of a hunk,
 809         # it can be split, but we would need to take care of
 810         # overlaps later.
 811
 812         my ($o_ofs, undef, $n_ofs) = parse_hunk_header($text->[0]);
 813         my $hunk_start = 1;
 814
 815       OUTER:
 816         while (1) {
 817                 my $next_hunk_start = undef;
 818                 my $i = $hunk_start - 1;
 819                 my $this = +{
 820                         TEXT => [],
 821                         DISPLAY => [],
 822                         TYPE => 'hunk',
 823                         OLD => $o_ofs,
 824                         NEW => $n_ofs,
 825                         OCNT => 0,
 826                         NCNT => 0,
 827                         ADDDEL => 0,
 828                         POSTCTX => 0,
 829                         USE => undef,
 830                 };
 831
 832                 while (++$i < @$text) {
 833                         my $line = $text->[$i];
 834                         my $display = $display->[$i];
 835                         if ($line =~ /^ /) {
 836                                 if ($this->{ADDDEL} &&
 837                                     !defined $next_hunk_start) {
 838                                         # We have seen leading context and
 839                                         # adds/dels and then here is another
 840                                         # context, which is trailing for this
 841                                         # split hunk and leading for the next
 842                                         # one.
 843                                         $next_hunk_start = $i;
 844                                 }
 845                                 push @{$this->{TEXT}}, $line;
 846                                 push @{$this->{DISPLAY}}, $display;
 847                                 $this->{OCNT}++;
 848                                 $this->{NCNT}++;
 849                                 if (defined $next_hunk_start) {
 850                                         $this->{POSTCTX}++;
 851                                 }
 852                                 next;
 853                         }
 854
 855                         # add/del
 856                         if (defined $next_hunk_start) {
 857                                 # We are done with the current hunk and
 858                                 # this is the first real change for the
 859                                 # next split one.
 860                                 $hunk_start = $next_hunk_start;
 861                                 $o_ofs = $this->{OLD} + $this->{OCNT};
 862                                 $n_ofs = $this->{NEW} + $this->{NCNT};
 863                                 $o_ofs -= $this->{POSTCTX};
 864                                 $n_ofs -= $this->{POSTCTX};
 865                                 push @split, $this;
 866                                 redo OUTER;
 867                         }
 868                         push @{$this->{TEXT}}, $line;
 869                         push @{$this->{DISPLAY}}, $display;
 870                         $this->{ADDDEL}++;
 871                         if ($line =~ /^-/) {
 872                                 $this->{OCNT}++;
 873                         }
 874                         else {
 875                                 $this->{NCNT}++;
 876                         }
 877                 }
 878
 879                 push @split, $this;
 880                 last;
 881         }
 882
 883         for my $hunk (@split) {
 884                 $o_ofs = $hunk->{OLD};
 885                 $n_ofs = $hunk->{NEW};
 886                 my $o_cnt = $hunk->{OCNT};
 887                 my $n_cnt = $hunk->{NCNT};
 888
 889                 my $head = ("@@ -$o_ofs" .
 890                             (($o_cnt != 1) ? ",$o_cnt" : '') .
 891                             " +$n_ofs" .
 892                             (($n_cnt != 1) ? ",$n_cnt" : '') .
 893                             " @@\n");
 894                 my $display_head = $head;
 895                 unshift @{$hunk->{TEXT}}, $head;
 896                 if ($diff_use_color) {
 897                         $display_head = colored($fraginfo_color, $head);
 898                 }
 899                 unshift @{$hunk->{DISPLAY}}, $display_head;
 900         }
 901         return @split;
 902 }
 903
 904 sub find_last_o_ctx {
 905         my ($it) = @_;
 906         my $text = $it->{TEXT};
 907         my ($o_ofs, $o_cnt) = parse_hunk_header($text->[0]);
 908         my $i = @{$text};
 909         my $last_o_ctx = $o_ofs + $o_cnt;
 910         while (0 < --$i) {
 911                 my $line = $text->[$i];
 912                 if ($line =~ /^ /) {
 913                         $last_o_ctx--;
 914                         next;
 915                 }
 916                 last;
 917         }
 918         return $last_o_ctx;
 919 }
 920
 921 sub merge_hunk {
 922         my ($prev, $this) = @_;
 923         my ($o0_ofs, $o0_cnt, $n0_ofs, $n0_cnt) =
 924             parse_hunk_header($prev->{TEXT}[0]);
 925         my ($o1_ofs, $o1_cnt, $n1_ofs, $n1_cnt) =
 926             parse_hunk_header($this->{TEXT}[0]);
 927
 928         my (@line, $i, $ofs, $o_cnt, $n_cnt);
 929         $ofs = $o0_ofs;
 930         $o_cnt = $n_cnt = 0;
 931         for ($i = 1; $i < @{$prev->{TEXT}}; $i++) {
 932                 my $line = $prev->{TEXT}[$i];
 933                 if ($line =~ /^\+/) {
 934                         $n_cnt++;
 935                         push @line, $line;
 936                         next;
 937                 }
 938
 939                 last if ($o1_ofs <= $ofs);
 940
 941                 $o_cnt++;
 942                 $ofs++;
 943                 if ($line =~ /^ /) {
 944                         $n_cnt++;
 945                 }
 946                 push @line, $line;
 947         }
 948
 949         for ($i = 1; $i < @{$this->{TEXT}}; $i++) {
 950                 my $line = $this->{TEXT}[$i];
 951                 if ($line =~ /^\+/) {
 952                         $n_cnt++;
 953                         push @line, $line;
 954                         next;
 955                 }
 956                 $ofs++;
 957                 $o_cnt++;
 958                 if ($line =~ /^ /) {
 959                         $n_cnt++;
 960                 }
 961                 push @line, $line;
 962         }
 963         my $head = ("@@ -$o0_ofs" .
 964                     (($o_cnt != 1) ? ",$o_cnt" : '') .
 965                     " +$n0_ofs" .
 966                     (($n_cnt != 1) ? ",$n_cnt" : '') .
 967                     " @@\n");
 968         @{$prev->{TEXT}} = ($head, @line);
 969 }
 970
 971 sub coalesce_overlapping_hunks {
 972         my (@in) = @_;
 973         my @out = ();
 974
 975         my ($last_o_ctx, $last_was_dirty);
 976
 977         for (grep { $_->{USE} } @in) {
 978                 if ($_->{TYPE} ne 'hunk') {
 979                         push @out, $_;
 980                         next;
 981                 }
 982                 my $text = $_->{TEXT};
 983                 my ($o_ofs) = parse_hunk_header($text->[0]);
 984                 if (defined $last_o_ctx &&
 985                     $o_ofs <= $last_o_ctx &&
 986                     !$_->{DIRTY} &&
 987                     !$last_was_dirty) {
 988                         merge_hunk($out[-1], $_);
 989                 }
 990                 else {
 991                         push @out, $_;
 992                 }
 993                 $last_o_ctx = find_last_o_ctx($out[-1]);
 994                 $last_was_dirty = $_->{DIRTY};
 995         }
 996         return @out;
 997 }
 998
 999 sub reassemble_patch {
1000         my $head = shift;
1001         my @patch;
1002
1003         # Include everything in the header except the beginning of the diff.
1004         push @patch, (grep { !/^[-+]{3}/ } @$head);
1005
1006         # Then include any headers from the hunk lines, which must
1007         # come before any actual hunk.
1008         while (@_ && $_[0] !~ /^@/) {
1009                 push @patch, shift;
1010         }
1011
1012         # Then begin the diff.
1013         push @patch, grep { /^[-+]{3}/ } @$head;
1014
1015         # And then the actual hunks.
1016         push @patch, @_;
1017
1018         return @patch;
1019 }
1020
1021 sub color_diff {
1022         return map {
1023                 colored((/^@/  ? $fraginfo_color :
1024                          /^\+/ ? $diff_new_color :
1025                          /^-/  ? $diff_old_color :
1026                          $diff_plain_color),
1027                         $_);
1028         } @_;
1029 }
1030
1031 sub edit_hunk_manually {
1032         my ($oldtext) = @_;
1033
1034         my $hunkfile = $repo->repo_path . "/addp-hunk-edit.diff";
1035         my $fh;
1036         open $fh, '>', $hunkfile
1037                 or die "failed to open hunk edit file for writing: " . $!;
1038         print $fh "# Manual hunk edit mode -- see bottom for a quick guide\n";
1039         print $fh @$oldtext;
1040         my $participle = $patch_mode_flavour{PARTICIPLE};
1041         my $is_reverse = $patch_mode_flavour{IS_REVERSE};
1042         my ($remove_plus, $remove_minus) = $is_reverse ? ('-', '+') : ('+', '-');
1043         print $fh <<EOF;
1044 # ---
1045 # To remove '$remove_minus' lines, make them ' ' lines (context).
1046 # To remove '$remove_plus' lines, delete them.
1047 # Lines starting with # will be removed.
1048 #
1049 # If the patch applies cleanly, the edited hunk will immediately be
1050 # marked for $participle. If it does not apply cleanly, you will be given
1051 # an opportunity to edit again. If all lines of the hunk are removed,
1052 # then the edit is aborted and the hunk is left unchanged.
1053 EOF
1054         close $fh;
1055
1056         chomp(my $editor = run_cmd_pipe(qw(git var GIT_EDITOR)));
1057         system('sh', '-c', $editor.' "$@"', $editor, $hunkfile);
1058
1059         if ($? != 0) {
1060                 return undef;
1061         }
1062
1063         open $fh, '<', $hunkfile
1064                 or die "failed to open hunk edit file for reading: " . $!;
1065         my @newtext = grep { !/^#/ } <$fh>;
1066         close $fh;
1067         unlink $hunkfile;
1068
1069         # Abort if nothing remains
1070         if (!grep { /\S/ } @newtext) {
1071                 return undef;
1072         }
1073
1074         # Reinsert the first hunk header if the user accidentally deleted it
1075         if ($newtext[0] !~ /^@/) {
1076                 unshift @newtext, $oldtext->[0];
1077         }
1078         return \@newtext;
1079 }
1080
1081 sub diff_applies {
1082         return run_git_apply($patch_mode_flavour{APPLY_CHECK} . ' --check',
1083                              map { @{$_->{TEXT}} } @_);
1084 }
1085
1086 sub _restore_terminal_and_die {
1087         ReadMode 'restore';
1088         print "\n";
1089         exit 1;
1090 }
1091
1092 sub prompt_single_character {
1093         if ($use_readkey) {
1094                 local $SIG{TERM} = \&_restore_terminal_and_die;
1095                 local $SIG{INT} = \&_restore_terminal_and_die;
1096                 ReadMode 'cbreak';
1097                 my $key = ReadKey 0;
1098                 ReadMode 'restore';
1099                 if ($use_termcap and $key eq "\e") {
1100                         while (!defined $term_escapes{$key}) {
1101                                 my $next = ReadKey 0.5;
1102                                 last if (!defined $next);
1103                                 $key .= $next;
1104                         }
1105                         $key =~ s/\e/^[/;
1106                 }
1107                 print "$key" if defined $key;
1108                 print "\n";
1109                 return $key;
1110         } else {
1111                 return <STDIN>;
1112         }
1113 }
1114
1115 sub prompt_yesno {
1116         my ($prompt) = @_;
1117         while (1) {
1118                 print colored $prompt_color, $prompt;
1119                 my $line = prompt_single_character;
1120                 return 0 if $line =~ /^n/i;
1121                 return 1 if $line =~ /^y/i;
1122         }
1123 }
1124
1125 sub edit_hunk_loop {
1126         my ($head, $hunk, $ix) = @_;
1127         my $text = $hunk->[$ix]->{TEXT};
1128
1129         while (1) {
1130                 $text = edit_hunk_manually($text);
1131                 if (!defined $text) {
1132                         return undef;
1133                 }
1134                 my $newhunk = {
1135                         TEXT => $text,
1136                         TYPE => $hunk->[$ix]->{TYPE},
1137                         USE => 1,
1138                         DIRTY => 1,
1139                 };
1140                 if (diff_applies($head,
1141                                  @{$hunk}[0..$ix-1],
1142                                  $newhunk,
1143                                  @{$hunk}[$ix+1..$#{$hunk}])) {
1144                         $newhunk->{DISPLAY} = [color_diff(@{$text})];
1145                         return $newhunk;
1146                 }
1147                 else {
1148                         prompt_yesno(
1149                                 'Your edited hunk does not apply. Edit again '
1150                                 . '(saying "no" discards!) [y/n]? '
1151                                 ) or return undef;
1152                 }
1153         }
1154 }
1155
1156 sub help_patch_cmd {
1157         my $verb = lc $patch_mode_flavour{VERB};
1158         my $target = $patch_mode_flavour{TARGET};
1159         print colored $help_color, <<EOF ;
1160 y - $verb this hunk$target
1161 n - do not $verb this hunk$target
1162 q - quit; do not $verb this hunk or any of the remaining ones
1163 a - $verb this hunk and all later hunks in the file
1164 d - do not $verb this hunk or any of the later hunks in the file
1165 g - select a hunk to go to
1166 / - search for a hunk matching the given regex
1167 j - leave this hunk undecided, see next undecided hunk
1168 J - leave this hunk undecided, see next hunk
1169 k - leave this hunk undecided, see previous undecided hunk
1170 K - leave this hunk undecided, see previous hunk
1171 s - split the current hunk into smaller hunks
1172 e - manually edit the current hunk
1173 ? - print help
1174 EOF
1175 }
1176
1177 sub apply_patch {
1178         my $cmd = shift;
1179         my $ret = run_git_apply $cmd, @_;
1180         if (!$ret) {
1181                 print STDERR @_;
1182         }
1183         return $ret;
1184 }
1185
1186 sub apply_patch_for_checkout_commit {
1187         my $reverse = shift;
1188         my $applies_index = run_git_apply 'apply '.$reverse.' --cached --check', @_;
1189         my $applies_worktree = run_git_apply 'apply '.$reverse.' --check', @_;
1190
1191         if ($applies_worktree && $applies_index) {
1192                 run_git_apply 'apply '.$reverse.' --cached', @_;
1193                 run_git_apply 'apply '.$reverse, @_;
1194                 return 1;
1195         } elsif (!$applies_index) {
1196                 print colored $error_color, "The selected hunks do not apply to the index!\n";
1197                 if (prompt_yesno "Apply them to the worktree anyway? ") {
1198                         return run_git_apply 'apply '.$reverse, @_;
1199                 } else {
1200                         print colored $error_color, "Nothing was applied.\n";
1201                         return 0;
1202                 }
1203         } else {
1204                 print STDERR @_;
1205                 return 0;
1206         }
1207 }
1208
1209 sub patch_update_cmd {
1210         my @all_mods = list_modified($patch_mode_flavour{FILTER});
1211         error_msg "ignoring unmerged: $_->{VALUE}\n"
1212                 for grep { $_->{UNMERGED} } @all_mods;
1213         @all_mods = grep { !$_->{UNMERGED} } @all_mods;
1214
1215         my @mods = grep { !($_->{BINARY}) } @all_mods;
1216         my @them;
1217
1218         if (!@mods) {
1219                 if (@all_mods) {
1220                         print STDERR "Only binary files changed.\n";
1221                 } else {
1222                         print STDERR "No changes.\n";
1223                 }
1224                 return 0;
1225         }
1226         if ($patch_mode) {
1227                 @them = @mods;
1228         }
1229         else {
1230                 @them = list_and_choose({ PROMPT => 'Patch update',
1231                                           HEADER => $status_head, },
1232                                         @mods);
1233         }
1234         for (@them) {
1235                 return 0 if patch_update_file($_->{VALUE});
1236         }
1237 }
1238
1239 # Generate a one line summary of a hunk.
1240 sub summarize_hunk {
1241         my $rhunk = shift;
1242         my $summary = $rhunk->{TEXT}[0];
1243
1244         # Keep the line numbers, discard extra context.
1245         $summary =~ s/@@(.*?)@@.*/$1 /s;
1246         $summary .= " " x (20 - length $summary);
1247
1248         # Add some user context.
1249         for my $line (@{$rhunk->{TEXT}}) {
1250                 if ($line =~ m/^[+-].*\w/) {
1251                         $summary .= $line;
1252                         last;
1253                 }
1254         }
1255
1256         chomp $summary;
1257         return substr($summary, 0, 80) . "\n";
1258 }
1259
1260
1261 # Print a one-line summary of each hunk in the array ref in
1262 # the first argument, starting with the index in the 2nd.
1263 sub display_hunks {
1264         my ($hunks, $i) = @_;
1265         my $ctr = 0;
1266         $i ||= 0;
1267         for (; $i < @$hunks && $ctr < 20; $i++, $ctr++) {
1268                 my $status = " ";
1269                 if (defined $hunks->[$i]{USE}) {
1270                         $status = $hunks->[$i]{USE} ? "+" : "-";
1271                 }
1272                 printf "%s%2d: %s",
1273                         $status,
1274                         $i + 1,
1275                         summarize_hunk($hunks->[$i]);
1276         }
1277         return $i;
1278 }
1279
1280 sub patch_update_file {
1281         my $quit = 0;
1282         my ($ix, $num);
1283         my $path = shift;
1284         my ($head, @hunk) = parse_diff($path);
1285         ($head, my $mode, my $deletion) = parse_diff_header($head);
1286         for (@{$head->{DISPLAY}}) {
1287                 print;
1288         }
1289
1290         if (@{$mode->{TEXT}}) {
1291                 unshift @hunk, $mode;
1292         }
1293         if (@{$deletion->{TEXT}}) {
1294                 foreach my $hunk (@hunk) {
1295                         push @{$deletion->{TEXT}}, @{$hunk->{TEXT}};
1296                         push @{$deletion->{DISPLAY}}, @{$hunk->{DISPLAY}};
1297                 }
1298                 @hunk = ($deletion);
1299         }
1300
1301         $num = scalar @hunk;
1302         $ix = 0;
1303
1304         while (1) {
1305                 my ($prev, $next, $other, $undecided, $i);
1306                 $other = '';
1307
1308                 if ($num <= $ix) {
1309                         $ix = 0;
1310                 }
1311                 for ($i = 0; $i < $ix; $i++) {
1312                         if (!defined $hunk[$i]{USE}) {
1313                                 $prev = 1;
1314                                 $other .= ',k';
1315                                 last;
1316                         }
1317                 }
1318                 if ($ix) {
1319                         $other .= ',K';
1320                 }
1321                 for ($i = $ix + 1; $i < $num; $i++) {
1322                         if (!defined $hunk[$i]{USE}) {
1323                                 $next = 1;
1324                                 $other .= ',j';
1325                                 last;
1326                         }
1327                 }
1328                 if ($ix < $num - 1) {
1329                         $other .= ',J';
1330                 }
1331                 if ($num > 1) {
1332                         $other .= ',g';
1333                 }
1334                 for ($i = 0; $i < $num; $i++) {
1335                         if (!defined $hunk[$i]{USE}) {
1336                                 $undecided = 1;
1337                                 last;
1338                         }
1339                 }
1340                 last if (!$undecided);
1341
1342                 if ($hunk[$ix]{TYPE} eq 'hunk' &&
1343                     hunk_splittable($hunk[$ix]{TEXT})) {
1344                         $other .= ',s';
1345                 }
1346                 if ($hunk[$ix]{TYPE} eq 'hunk') {
1347                         $other .= ',e';
1348                 }
1349                 for (@{$hunk[$ix]{DISPLAY}}) {
1350                         print;
1351                 }
1352                 print colored $prompt_color, $patch_mode_flavour{VERB},
1353                   ($hunk[$ix]{TYPE} eq 'mode' ? ' mode change' :
1354                    $hunk[$ix]{TYPE} eq 'deletion' ? ' deletion' :
1355                    ' this hunk'),
1356                   $patch_mode_flavour{TARGET},
1357                   " [y,n,q,a,d,/$other,?]? ";
1358                 my $line = prompt_single_character;
1359                 last unless defined $line;
1360                 if ($line) {
1361                         if ($line =~ /^y/i) {
1362                                 $hunk[$ix]{USE} = 1;
1363                         }
1364                         elsif ($line =~ /^n/i) {
1365                                 $hunk[$ix]{USE} = 0;
1366                         }
1367                         elsif ($line =~ /^a/i) {
1368                                 while ($ix < $num) {
1369                                         if (!defined $hunk[$ix]{USE}) {
1370                                                 $hunk[$ix]{USE} = 1;
1371                                         }
1372                                         $ix++;
1373                                 }
1374                                 next;
1375                         }
1376                         elsif ($other =~ /g/ && $line =~ /^g(.*)/) {
1377                                 my $response = $1;
1378                                 my $no = $ix > 10 ? $ix - 10 : 0;
1379                                 while ($response eq '') {
1380                                         my $extra = "";
1381                                         $no = display_hunks(\@hunk, $no);
1382                                         if ($no < $num) {
1383                                                 $extra = " (<ret> to see more)";
1384                                         }
1385                                         print "go to which hunk$extra? ";
1386                                         $response = <STDIN>;
1387                                         if (!defined $response) {
1388                                                 $response = '';
1389                                         }
1390                                         chomp $response;
1391                                 }
1392                                 if ($response !~ /^\s*\d+\s*$/) {
1393                                         error_msg "Invalid number: '$response'\n";
1394                                 } elsif (0 < $response && $response <= $num) {
1395                                         $ix = $response - 1;
1396                                 } else {
1397                                         error_msg "Sorry, only $num hunks available.\n";
1398                                 }
1399                                 next;
1400                         }
1401                         elsif ($line =~ /^d/i) {
1402                                 while ($ix < $num) {
1403                                         if (!defined $hunk[$ix]{USE}) {
1404                                                 $hunk[$ix]{USE} = 0;
1405                                         }
1406                                         $ix++;
1407                                 }
1408                                 next;
1409                         }
1410                         elsif ($line =~ /^q/i) {
1411                                 for ($i = 0; $i < $num; $i++) {
1412                                         if (!defined $hunk[$i]{USE}) {
1413                                                 $hunk[$i]{USE} = 0;
1414                                         }
1415                                 }
1416                                 $quit = 1;
1417                                 last;
1418                         }
1419                         elsif ($line =~ m|^/(.*)|) {
1420                                 my $regex = $1;
1421                                 if ($1 eq "") {
1422                                         print colored $prompt_color, "search for regex? ";
1423                                         $regex = <STDIN>;
1424                                         if (defined $regex) {
1425                                                 chomp $regex;
1426                                         }
1427                                 }
1428                                 my $search_string;
1429                                 eval {
1430                                         $search_string = qr{$regex}m;
1431                                 };
1432                                 if ($@) {
1433                                         my ($err,$exp) = ($@, $1);
1434                                         $err =~ s/ at .*git-add--interactive line \d+, <STDIN> line \d+.*$//;
1435                                         error_msg "Malformed search regexp $exp: $err\n";
1436                                         next;
1437                                 }
1438                                 my $iy = $ix;
1439                                 while (1) {
1440                                         my $text = join ("", @{$hunk[$iy]{TEXT}});
1441                                         last if ($text =~ $search_string);
1442                                         $iy++;
1443                                         $iy = 0 if ($iy >= $num);
1444                                         if ($ix == $iy) {
1445                                                 error_msg "No hunk matches the given pattern\n";
1446                                                 last;
1447                                         }
1448                                 }
1449                                 $ix = $iy;
1450                                 next;
1451                         }
1452                         elsif ($line =~ /^K/) {
1453                                 if ($other =~ /K/) {
1454                                         $ix--;
1455                                 }
1456                                 else {
1457                                         error_msg "No previous hunk\n";
1458                                 }
1459                                 next;
1460                         }
1461                         elsif ($line =~ /^J/) {
1462                                 if ($other =~ /J/) {
1463                                         $ix++;
1464                                 }
1465                                 else {
1466                                         error_msg "No next hunk\n";
1467                                 }
1468                                 next;
1469                         }
1470                         elsif ($line =~ /^k/) {
1471                                 if ($other =~ /k/) {
1472                                         while (1) {
1473                                                 $ix--;
1474                                                 last if (!$ix ||
1475                                                          !defined $hunk[$ix]{USE});
1476                                         }
1477                                 }
1478                                 else {
1479                                         error_msg "No previous hunk\n";
1480                                 }
1481                                 next;
1482                         }
1483                         elsif ($line =~ /^j/) {
1484                                 if ($other !~ /j/) {
1485                                         error_msg "No next hunk\n";
1486                                         next;
1487                                 }
1488                         }
1489                         elsif ($other =~ /s/ && $line =~ /^s/) {
1490                                 my @split = split_hunk($hunk[$ix]{TEXT}, $hunk[$ix]{DISPLAY});
1491                                 if (1 < @split) {
1492                                         print colored $header_color, "Split into ",
1493                                         scalar(@split), " hunks.\n";
1494                                 }
1495                                 splice (@hunk, $ix, 1, @split);
1496                                 $num = scalar @hunk;
1497                                 next;
1498                         }
1499                         elsif ($other =~ /e/ && $line =~ /^e/) {
1500                                 my $newhunk = edit_hunk_loop($head, \@hunk, $ix);
1501                                 if (defined $newhunk) {
1502                                         splice @hunk, $ix, 1, $newhunk;
1503                                 }
1504                         }
1505                         else {
1506                                 help_patch_cmd($other);
1507                                 next;
1508                         }
1509                         # soft increment
1510                         while (1) {
1511                                 $ix++;
1512                                 last if ($ix >= $num ||
1513                                          !defined $hunk[$ix]{USE});
1514                         }
1515                 }
1516         }
1517
1518         @hunk = coalesce_overlapping_hunks(@hunk);
1519
1520         my $n_lofs = 0;
1521         my @result = ();
1522         for (@hunk) {
1523                 if ($_->{USE}) {
1524                         push @result, @{$_->{TEXT}};
1525                 }
1526         }
1527
1528         if (@result) {
1529                 my @patch = reassemble_patch($head->{TEXT}, @result);
1530                 my $apply_routine = $patch_mode_flavour{APPLY};
1531                 &$apply_routine(@patch);
1532                 refresh();
1533         }
1534
1535         print "\n";
1536         return $quit;
1537 }
1538
1539 sub diff_cmd {
1540         my @mods = list_modified('index-only');
1541         @mods = grep { !($_->{BINARY}) } @mods;
1542         return if (!@mods);
1543         my (@them) = list_and_choose({ PROMPT => 'Review diff',
1544                                      IMMEDIATE => 1,
1545                                      HEADER => $status_head, },
1546                                    @mods);
1547         return if (!@them);
1548         my $reference = is_initial_commit() ? get_empty_tree() : 'HEAD';
1549         system(qw(git diff -p --cached), $reference, '--',
1550                 map { $_->{VALUE} } @them);
1551 }
1552
1553 sub quit_cmd {
1554         print "Bye.\n";
1555         exit(0);
1556 }
1557
1558 sub help_cmd {
1559         print colored $help_color, <<\EOF ;
1560 status        - show paths with changes
1561 update        - add working tree state to the staged set of changes
1562 revert        - revert staged set of changes back to the HEAD version
1563 patch         - pick hunks and update selectively
1564 diff          - view diff between HEAD and index
1565 add untracked - add contents of untracked files to the staged set of changes
1566 EOF
1567 }
1568
1569 sub process_args {
1570         return unless @ARGV;
1571         my $arg = shift @ARGV;
1572         if ($arg =~ /--patch(?:=(.*))?/) {
1573                 if (defined $1) {
1574                         if ($1 eq 'reset') {
1575                                 $patch_mode = 'reset_head';
1576                                 $patch_mode_revision = 'HEAD';
1577                                 $arg = shift @ARGV or die "missing --";
1578                                 if ($arg ne '--') {
1579                                         $patch_mode_revision = $arg;
1580                                         $patch_mode = ($arg eq 'HEAD' ?
1581                                                        'reset_head' : 'reset_nothead');
1582                                         $arg = shift @ARGV or die "missing --";
1583                                 }
1584                         } elsif ($1 eq 'checkout') {
1585                                 $arg = shift @ARGV or die "missing --";
1586                                 if ($arg eq '--') {
1587                                         $patch_mode = 'checkout_index';
1588                                 } else {
1589                                         $patch_mode_revision = $arg;
1590                                         $patch_mode = ($arg eq 'HEAD' ?
1591                                                        'checkout_head' : 'checkout_nothead');
1592                                         $arg = shift @ARGV or die "missing --";
1593                                 }
1594                         } elsif ($1 eq 'stage' or $1 eq 'stash') {
1595                                 $patch_mode = $1;
1596                                 $arg = shift @ARGV or die "missing --";
1597                         } else {
1598                                 die "unknown --patch mode: $1";
1599                         }
1600                 } else {
1601                         $patch_mode = 'stage';
1602                         $arg = shift @ARGV or die "missing --";
1603                 }
1604                 die "invalid argument $arg, expecting --"
1605                     unless $arg eq "--";
1606                 %patch_mode_flavour = %{$patch_modes{$patch_mode}};
1607         }
1608         elsif ($arg ne "--") {
1609                 die "invalid argument $arg, expecting --";
1610         }
1611 }
1612
1613 sub main_loop {
1614         my @cmd = ([ 'status', \&status_cmd, ],
1615                    [ 'update', \&update_cmd, ],
1616                    [ 'revert', \&revert_cmd, ],
1617                    [ 'add untracked', \&add_untracked_cmd, ],
1618                    [ 'patch', \&patch_update_cmd, ],
1619                    [ 'diff', \&diff_cmd, ],
1620                    [ 'quit', \&quit_cmd, ],
1621                    [ 'help', \&help_cmd, ],
1622         );
1623         while (1) {
1624                 my ($it) = list_and_choose({ PROMPT => 'What now',
1625                                              SINGLETON => 1,
1626                                              LIST_FLAT => 4,
1627                                              HEADER => '*** Commands ***',
1628                                              ON_EOF => \&quit_cmd,
1629                                              IMMEDIATE => 1 }, @cmd);
1630                 if ($it) {
1631                         eval {
1632                                 $it->[1]->();
1633                         };
1634                         if ($@) {
1635                                 print "$@";
1636                         }
1637                 }
1638         }
1639 }
1640
1641 process_args();
1642 refresh();
1643 if ($patch_mode) {
1644         patch_update_cmd();
1645 }
1646 else {
1647         status_cmd();
1648         main_loop();
1649 }