git-add--interactive.perl

   1 #!/usr/bin/perl -w
   2
   3 use strict;
   4 use Git;
   5
   6 my $repo = Git->repository();
   7
   8 my $menu_use_color = $repo->get_colorbool('color.interactive');
   9 my ($prompt_color, $header_color, $help_color) =
  10         $menu_use_color ? (
  11                 $repo->get_color('color.interactive.prompt', 'bold blue'),
  12                 $repo->get_color('color.interactive.header', 'bold'),
  13                 $repo->get_color('color.interactive.help', 'red bold'),
  14         ) : ();
  15
  16 my $diff_use_color = $repo->get_colorbool('color.diff');
  17 my ($fraginfo_color) =
  18         $diff_use_color ? (
  19                 $repo->get_color('color.diff.frag', 'cyan'),
  20         ) : ();
  21 my ($diff_plain_color) =
  22         $diff_use_color ? (
  23                 $repo->get_color('color.diff.plain', ''),
  24         ) : ();
  25 my ($diff_old_color) =
  26         $diff_use_color ? (
  27                 $repo->get_color('color.diff.old', 'red'),
  28         ) : ();
  29 my ($diff_new_color) =
  30         $diff_use_color ? (
  31                 $repo->get_color('color.diff.new', 'green'),
  32         ) : ();
  33
  34 my $normal_color = $repo->get_color("", "reset");
  35
  36 sub colored {
  37         my $color = shift;
  38         my $string = join("", @_);
  39
  40         if (defined $color) {
  41                 # Put a color code at the beginning of each line, a reset at the end
  42                 # color after newlines that are not at the end of the string
  43                 $string =~ s/(\n+)(.)/$1$color$2/g;
  44                 # reset before newlines
  45                 $string =~ s/(\n+)/$normal_color$1/g;
  46                 # codes at beginning and end (if necessary):
  47                 $string =~ s/^/$color/;
  48                 $string =~ s/$/$normal_color/ unless $string =~ /\n$/;
  49         }
  50         return $string;
  51 }
  52
  53 # command line options
  54 my $patch_mode;
  55
  56 sub run_cmd_pipe {
  57         if ($^O eq 'MSWin32' || $^O eq 'msys') {
  58                 my @invalid = grep {m/[":*]/} @_;
  59                 die "$^O does not support: @invalid\n" if @invalid;
  60                 my @args = map { m/ /o ? "\"$_\"": $_ } @_;
  61                 return qx{@args};
  62         } else {
  63                 my $fh = undef;
  64                 open($fh, '-|', @_) or die;
  65                 return <$fh>;
  66         }
  67 }
  68
  69 my ($GIT_DIR) = run_cmd_pipe(qw(git rev-parse --git-dir));
  70
  71 if (!defined $GIT_DIR) {
  72         exit(1); # rev-parse would have already said "not a git repo"
  73 }
  74 chomp($GIT_DIR);
  75
  76 sub refresh {
  77         my $fh;
  78         open $fh, 'git update-index --refresh |'
  79             or die;
  80         while (<$fh>) {
  81                 ;# ignore 'needs update'
  82         }
  83         close $fh;
  84 }
  85
  86 sub list_untracked {
  87         map {
  88                 chomp $_;
  89                 $_;
  90         }
  91         run_cmd_pipe(qw(git ls-files --others --exclude-standard --), @ARGV);
  92 }
  93
  94 my $status_fmt = '%12s %12s %s';
  95 my $status_head = sprintf($status_fmt, 'staged', 'unstaged', 'path');
  96
  97 {
  98         my $initial;
  99         sub is_initial_commit {
 100                 $initial = system('git rev-parse HEAD -- >/dev/null 2>&1') != 0
 101                         unless defined $initial;
 102                 return $initial;
 103         }
 104 }
 105
 106 sub get_empty_tree {
 107         return '4b825dc642cb6eb9a060e54bf8d69288fbee4904';
 108 }
 109
 110 # Returns list of hashes, contents of each of which are:
 111 # VALUE:        pathname
 112 # BINARY:       is a binary path
 113 # INDEX:        is index different from HEAD?
 114 # FILE:         is file different from index?
 115 # INDEX_ADDDEL: is it add/delete between HEAD and index?
 116 # FILE_ADDDEL:  is it add/delete between index and file?
 117
 118 sub list_modified {
 119         my ($only) = @_;
 120         my (%data, @return);
 121         my ($add, $del, $adddel, $file);
 122         my @tracked = ();
 123
 124         if (@ARGV) {
 125                 @tracked = map {
 126                         chomp $_; $_;
 127                 } run_cmd_pipe(qw(git ls-files --exclude-standard --), @ARGV);
 128                 return if (!@tracked);
 129         }
 130
 131         my $reference = is_initial_commit() ? get_empty_tree() : 'HEAD';
 132         for (run_cmd_pipe(qw(git diff-index --cached
 133                              --numstat --summary), $reference,
 134                              '--', @tracked)) {
 135                 if (($add, $del, $file) =
 136                     /^([-\d]+)  ([-\d]+)        (.*)/) {
 137                         my ($change, $bin);
 138                         if ($add eq '-' && $del eq '-') {
 139                                 $change = 'binary';
 140                                 $bin = 1;
 141                         }
 142                         else {
 143                                 $change = "+$add/-$del";
 144                         }
 145                         $data{$file} = {
 146                                 INDEX => $change,
 147                                 BINARY => $bin,
 148                                 FILE => 'nothing',
 149                         }
 150                 }
 151                 elsif (($adddel, $file) =
 152                        /^ (create|delete) mode [0-7]+ (.*)$/) {
 153                         $data{$file}{INDEX_ADDDEL} = $adddel;
 154                 }
 155         }
 156
 157         for (run_cmd_pipe(qw(git diff-files --numstat --summary --), @tracked)) {
 158                 if (($add, $del, $file) =
 159                     /^([-\d]+)  ([-\d]+)        (.*)/) {
 160                         if (!exists $data{$file}) {
 161                                 $data{$file} = +{
 162                                         INDEX => 'unchanged',
 163                                         BINARY => 0,
 164                                 };
 165                         }
 166                         my ($change, $bin);
 167                         if ($add eq '-' && $del eq '-') {
 168                                 $change = 'binary';
 169                                 $bin = 1;
 170                         }
 171                         else {
 172                                 $change = "+$add/-$del";
 173                         }
 174                         $data{$file}{FILE} = $change;
 175                         if ($bin) {
 176                                 $data{$file}{BINARY} = 1;
 177                         }
 178                 }
 179                 elsif (($adddel, $file) =
 180                        /^ (create|delete) mode [0-7]+ (.*)$/) {
 181                         $data{$file}{FILE_ADDDEL} = $adddel;
 182                 }
 183         }
 184
 185         for (sort keys %data) {
 186                 my $it = $data{$_};
 187
 188                 if ($only) {
 189                         if ($only eq 'index-only') {
 190                                 next if ($it->{INDEX} eq 'unchanged');
 191                         }
 192                         if ($only eq 'file-only') {
 193                                 next if ($it->{FILE} eq 'nothing');
 194                         }
 195                 }
 196                 push @return, +{
 197                         VALUE => $_,
 198                         %$it,
 199                 };
 200         }
 201         return @return;
 202 }
 203
 204 sub find_unique {
 205         my ($string, @stuff) = @_;
 206         my $found = undef;
 207         for (my $i = 0; $i < @stuff; $i++) {
 208                 my $it = $stuff[$i];
 209                 my $hit = undef;
 210                 if (ref $it) {
 211                         if ((ref $it) eq 'ARRAY') {
 212                                 $it = $it->[0];
 213                         }
 214                         else {
 215                                 $it = $it->{VALUE};
 216                         }
 217                 }
 218                 eval {
 219                         if ($it =~ /^$string/) {
 220                                 $hit = 1;
 221                         };
 222                 };
 223                 if (defined $hit && defined $found) {
 224                         return undef;
 225                 }
 226                 if ($hit) {
 227                         $found = $i + 1;
 228                 }
 229         }
 230         return $found;
 231 }
 232
 233 # inserts string into trie and updates count for each character
 234 sub update_trie {
 235         my ($trie, $string) = @_;
 236         foreach (split //, $string) {
 237                 $trie = $trie->{$_} ||= {COUNT => 0};
 238                 $trie->{COUNT}++;
 239         }
 240 }
 241
 242 # returns an array of tuples (prefix, remainder)
 243 sub find_unique_prefixes {
 244         my @stuff = @_;
 245         my @return = ();
 246
 247         # any single prefix exceeding the soft limit is omitted
 248         # if any prefix exceeds the hard limit all are omitted
 249         # 0 indicates no limit
 250         my $soft_limit = 0;
 251         my $hard_limit = 3;
 252
 253         # build a trie modelling all possible options
 254         my %trie;
 255         foreach my $print (@stuff) {
 256                 if ((ref $print) eq 'ARRAY') {
 257                         $print = $print->[0];
 258                 }
 259                 elsif ((ref $print) eq 'HASH') {
 260                         $print = $print->{VALUE};
 261                 }
 262                 update_trie(\%trie, $print);
 263                 push @return, $print;
 264         }
 265
 266         # use the trie to find the unique prefixes
 267         for (my $i = 0; $i < @return; $i++) {
 268                 my $ret = $return[$i];
 269                 my @letters = split //, $ret;
 270                 my %search = %trie;
 271                 my ($prefix, $remainder);
 272                 my $j;
 273                 for ($j = 0; $j < @letters; $j++) {
 274                         my $letter = $letters[$j];
 275                         if ($search{$letter}{COUNT} == 1) {
 276                                 $prefix = substr $ret, 0, $j + 1;
 277                                 $remainder = substr $ret, $j + 1;
 278                                 last;
 279                         }
 280                         else {
 281                                 my $prefix = substr $ret, 0, $j;
 282                                 return ()
 283                                     if ($hard_limit && $j + 1 > $hard_limit);
 284                         }
 285                         %search = %{$search{$letter}};
 286                 }
 287                 if ($soft_limit && $j + 1 > $soft_limit) {
 288                         $prefix = undef;
 289                         $remainder = $ret;
 290                 }
 291                 $return[$i] = [$prefix, $remainder];
 292         }
 293         return @return;
 294 }
 295
 296 # filters out prefixes which have special meaning to list_and_choose()
 297 sub is_valid_prefix {
 298         my $prefix = shift;
 299         return (defined $prefix) &&
 300             !($prefix =~ /[\s,]/) && # separators
 301             !($prefix =~ /^-/) &&    # deselection
 302             !($prefix =~ /^\d+/) &&  # selection
 303             ($prefix ne '*') &&      # "all" wildcard
 304             ($prefix ne '?');        # prompt help
 305 }
 306
 307 # given a prefix/remainder tuple return a string with the prefix highlighted
 308 # for now use square brackets; later might use ANSI colors (underline, bold)
 309 sub highlight_prefix {
 310         my $prefix = shift;
 311         my $remainder = shift;
 312
 313         if (!defined $prefix) {
 314                 return $remainder;
 315         }
 316
 317         if (!is_valid_prefix($prefix)) {
 318                 return "$prefix$remainder";
 319         }
 320
 321         if (!$menu_use_color) {
 322                 return "[$prefix]$remainder";
 323         }
 324
 325         return "$prompt_color$prefix$normal_color$remainder";
 326 }
 327
 328 sub list_and_choose {
 329         my ($opts, @stuff) = @_;
 330         my (@chosen, @return);
 331         my $i;
 332         my @prefixes = find_unique_prefixes(@stuff) unless $opts->{LIST_ONLY};
 333
 334       TOPLOOP:
 335         while (1) {
 336                 my $last_lf = 0;
 337
 338                 if ($opts->{HEADER}) {
 339                         if (!$opts->{LIST_FLAT}) {
 340                                 print "     ";
 341                         }
 342                         print colored $header_color, "$opts->{HEADER}\n";
 343                 }
 344                 for ($i = 0; $i < @stuff; $i++) {
 345                         my $chosen = $chosen[$i] ? '*' : ' ';
 346                         my $print = $stuff[$i];
 347                         my $ref = ref $print;
 348                         my $highlighted = highlight_prefix(@{$prefixes[$i]})
 349                             if @prefixes;
 350                         if ($ref eq 'ARRAY') {
 351                                 $print = $highlighted || $print->[0];
 352                         }
 353                         elsif ($ref eq 'HASH') {
 354                                 my $value = $highlighted || $print->{VALUE};
 355                                 $print = sprintf($status_fmt,
 356                                     $print->{INDEX},
 357                                     $print->{FILE},
 358                                     $value);
 359                         }
 360                         else {
 361                                 $print = $highlighted || $print;
 362                         }
 363                         printf("%s%2d: %s", $chosen, $i+1, $print);
 364                         if (($opts->{LIST_FLAT}) &&
 365                             (($i + 1) % ($opts->{LIST_FLAT}))) {
 366                                 print "\t";
 367                                 $last_lf = 0;
 368                         }
 369                         else {
 370                                 print "\n";
 371                                 $last_lf = 1;
 372                         }
 373                 }
 374                 if (!$last_lf) {
 375                         print "\n";
 376                 }
 377
 378                 return if ($opts->{LIST_ONLY});
 379
 380                 print colored $prompt_color, $opts->{PROMPT};
 381                 if ($opts->{SINGLETON}) {
 382                         print "> ";
 383                 }
 384                 else {
 385                         print ">> ";
 386                 }
 387                 my $line = <STDIN>;
 388                 if (!$line) {
 389                         print "\n";
 390                         $opts->{ON_EOF}->() if $opts->{ON_EOF};
 391                         last;
 392                 }
 393                 chomp $line;
 394                 last if $line eq '';
 395                 if ($line eq '?') {
 396                         $opts->{SINGLETON} ?
 397                             singleton_prompt_help_cmd() :
 398                             prompt_help_cmd();
 399                         next TOPLOOP;
 400                 }
 401                 for my $choice (split(/[\s,]+/, $line)) {
 402                         my $choose = 1;
 403                         my ($bottom, $top);
 404
 405                         # Input that begins with '-'; unchoose
 406                         if ($choice =~ s/^-//) {
 407                                 $choose = 0;
 408                         }
 409                         # A range can be specified like 5-7 or 5-.
 410                         if ($choice =~ /^(\d+)-(\d*)$/) {
 411                                 ($bottom, $top) = ($1, length($2) ? $2 : 1 + @stuff);
 412                         }
 413                         elsif ($choice =~ /^\d+$/) {
 414                                 $bottom = $top = $choice;
 415                         }
 416                         elsif ($choice eq '*') {
 417                                 $bottom = 1;
 418                                 $top = 1 + @stuff;
 419                         }
 420                         else {
 421                                 $bottom = $top = find_unique($choice, @stuff);
 422                                 if (!defined $bottom) {
 423                                         print "Huh ($choice)?\n";
 424                                         next TOPLOOP;
 425                                 }
 426                         }
 427                         if ($opts->{SINGLETON} && $bottom != $top) {
 428                                 print "Huh ($choice)?\n";
 429                                 next TOPLOOP;
 430                         }
 431                         for ($i = $bottom-1; $i <= $top-1; $i++) {
 432                                 next if (@stuff <= $i || $i < 0);
 433                                 $chosen[$i] = $choose;
 434                         }
 435                 }
 436                 last if ($opts->{IMMEDIATE} || $line eq '*');
 437         }
 438         for ($i = 0; $i < @stuff; $i++) {
 439                 if ($chosen[$i]) {
 440                         push @return, $stuff[$i];
 441                 }
 442         }
 443         return @return;
 444 }
 445
 446 sub singleton_prompt_help_cmd {
 447         print colored $help_color, <<\EOF ;
 448 Prompt help:
 449 1          - select a numbered item
 450 foo        - select item based on unique prefix
 451            - (empty) select nothing
 452 EOF
 453 }
 454
 455 sub prompt_help_cmd {
 456         print colored $help_color, <<\EOF ;
 457 Prompt help:
 458 1          - select a single item
 459 3-5        - select a range of items
 460 2-3,6-9    - select multiple ranges
 461 foo        - select item based on unique prefix
 462 -...       - unselect specified items
 463 *          - choose all items
 464            - (empty) finish selecting
 465 EOF
 466 }
 467
 468 sub status_cmd {
 469         list_and_choose({ LIST_ONLY => 1, HEADER => $status_head },
 470                         list_modified());
 471         print "\n";
 472 }
 473
 474 sub say_n_paths {
 475         my $did = shift @_;
 476         my $cnt = scalar @_;
 477         print "$did ";
 478         if (1 < $cnt) {
 479                 print "$cnt paths\n";
 480         }
 481         else {
 482                 print "one path\n";
 483         }
 484 }
 485
 486 sub update_cmd {
 487         my @mods = list_modified('file-only');
 488         return if (!@mods);
 489
 490         my @update = list_and_choose({ PROMPT => 'Update',
 491                                        HEADER => $status_head, },
 492                                      @mods);
 493         if (@update) {
 494                 system(qw(git update-index --add --remove --),
 495                        map { $_->{VALUE} } @update);
 496                 say_n_paths('updated', @update);
 497         }
 498         print "\n";
 499 }
 500
 501 sub revert_cmd {
 502         my @update = list_and_choose({ PROMPT => 'Revert',
 503                                        HEADER => $status_head, },
 504                                      list_modified());
 505         if (@update) {
 506                 if (is_initial_commit()) {
 507                         system(qw(git rm --cached),
 508                                 map { $_->{VALUE} } @update);
 509                 }
 510                 else {
 511                         my @lines = run_cmd_pipe(qw(git ls-tree HEAD --),
 512                                                  map { $_->{VALUE} } @update);
 513                         my $fh;
 514                         open $fh, '| git update-index --index-info'
 515                             or die;
 516                         for (@lines) {
 517                                 print $fh $_;
 518                         }
 519                         close($fh);
 520                         for (@update) {
 521                                 if ($_->{INDEX_ADDDEL} &&
 522                                     $_->{INDEX_ADDDEL} eq 'create') {
 523                                         system(qw(git update-index --force-remove --),
 524                                                $_->{VALUE});
 525                                         print "note: $_->{VALUE} is untracked now.\n";
 526                                 }
 527                         }
 528                 }
 529                 refresh();
 530                 say_n_paths('reverted', @update);
 531         }
 532         print "\n";
 533 }
 534
 535 sub add_untracked_cmd {
 536         my @add = list_and_choose({ PROMPT => 'Add untracked' },
 537                                   list_untracked());
 538         if (@add) {
 539                 system(qw(git update-index --add --), @add);
 540                 say_n_paths('added', @add);
 541         }
 542         print "\n";
 543 }
 544
 545 sub parse_diff {
 546         my ($path) = @_;
 547         my @diff = run_cmd_pipe(qw(git diff-files -p --), $path);
 548         my @colored = ();
 549         if ($diff_use_color) {
 550                 @colored = run_cmd_pipe(qw(git diff-files -p --color --), $path);
 551         }
 552         my (@hunk) = { TEXT => [], DISPLAY => [] };
 553
 554         for (my $i = 0; $i < @diff; $i++) {
 555                 if ($diff[$i] =~ /^@@ /) {
 556                         push @hunk, { TEXT => [], DISPLAY => [] };
 557                 }
 558                 push @{$hunk[-1]{TEXT}}, $diff[$i];
 559                 push @{$hunk[-1]{DISPLAY}},
 560                         ($diff_use_color ? $colored[$i] : $diff[$i]);
 561         }
 562         return @hunk;
 563 }
 564
 565 sub parse_diff_header {
 566         my $src = shift;
 567
 568         my $head = { TEXT => [], DISPLAY => [] };
 569         my $mode = { TEXT => [], DISPLAY => [] };
 570
 571         for (my $i = 0; $i < @{$src->{TEXT}}; $i++) {
 572                 my $dest = $src->{TEXT}->[$i] =~ /^(old|new) mode (\d+)$/ ?
 573                         $mode : $head;
 574                 push @{$dest->{TEXT}}, $src->{TEXT}->[$i];
 575                 push @{$dest->{DISPLAY}}, $src->{DISPLAY}->[$i];
 576         }
 577         return ($head, $mode);
 578 }
 579
 580 sub hunk_splittable {
 581         my ($text) = @_;
 582
 583         my @s = split_hunk($text);
 584         return (1 < @s);
 585 }
 586
 587 sub parse_hunk_header {
 588         my ($line) = @_;
 589         my ($o_ofs, $o_cnt, $n_ofs, $n_cnt) =
 590             $line =~ /^@@ -(\d+)(?:,(\d+))? \+(\d+)(?:,(\d+))? @@/;
 591         $o_cnt = 1 unless defined $o_cnt;
 592         $n_cnt = 1 unless defined $n_cnt;
 593         return ($o_ofs, $o_cnt, $n_ofs, $n_cnt);
 594 }
 595
 596 sub split_hunk {
 597         my ($text, $display) = @_;
 598         my @split = ();
 599         if (!defined $display) {
 600                 $display = $text;
 601         }
 602         # If there are context lines in the middle of a hunk,
 603         # it can be split, but we would need to take care of
 604         # overlaps later.
 605
 606         my ($o_ofs, undef, $n_ofs) = parse_hunk_header($text->[0]);
 607         my $hunk_start = 1;
 608
 609       OUTER:
 610         while (1) {
 611                 my $next_hunk_start = undef;
 612                 my $i = $hunk_start - 1;
 613                 my $this = +{
 614                         TEXT => [],
 615                         DISPLAY => [],
 616                         OLD => $o_ofs,
 617                         NEW => $n_ofs,
 618                         OCNT => 0,
 619                         NCNT => 0,
 620                         ADDDEL => 0,
 621                         POSTCTX => 0,
 622                         USE => undef,
 623                 };
 624
 625                 while (++$i < @$text) {
 626                         my $line = $text->[$i];
 627                         my $display = $display->[$i];
 628                         if ($line =~ /^ /) {
 629                                 if ($this->{ADDDEL} &&
 630                                     !defined $next_hunk_start) {
 631                                         # We have seen leading context and
 632                                         # adds/dels and then here is another
 633                                         # context, which is trailing for this
 634                                         # split hunk and leading for the next
 635                                         # one.
 636                                         $next_hunk_start = $i;
 637                                 }
 638                                 push @{$this->{TEXT}}, $line;
 639                                 push @{$this->{DISPLAY}}, $display;
 640                                 $this->{OCNT}++;
 641                                 $this->{NCNT}++;
 642                                 if (defined $next_hunk_start) {
 643                                         $this->{POSTCTX}++;
 644                                 }
 645                                 next;
 646                         }
 647
 648                         # add/del
 649                         if (defined $next_hunk_start) {
 650                                 # We are done with the current hunk and
 651                                 # this is the first real change for the
 652                                 # next split one.
 653                                 $hunk_start = $next_hunk_start;
 654                                 $o_ofs = $this->{OLD} + $this->{OCNT};
 655                                 $n_ofs = $this->{NEW} + $this->{NCNT};
 656                                 $o_ofs -= $this->{POSTCTX};
 657                                 $n_ofs -= $this->{POSTCTX};
 658                                 push @split, $this;
 659                                 redo OUTER;
 660                         }
 661                         push @{$this->{TEXT}}, $line;
 662                         push @{$this->{DISPLAY}}, $display;
 663                         $this->{ADDDEL}++;
 664                         if ($line =~ /^-/) {
 665                                 $this->{OCNT}++;
 666                         }
 667                         else {
 668                                 $this->{NCNT}++;
 669                         }
 670                 }
 671
 672                 push @split, $this;
 673                 last;
 674         }
 675
 676         for my $hunk (@split) {
 677                 $o_ofs = $hunk->{OLD};
 678                 $n_ofs = $hunk->{NEW};
 679                 my $o_cnt = $hunk->{OCNT};
 680                 my $n_cnt = $hunk->{NCNT};
 681
 682                 my $head = ("@@ -$o_ofs" .
 683                             (($o_cnt != 1) ? ",$o_cnt" : '') .
 684                             " +$n_ofs" .
 685                             (($n_cnt != 1) ? ",$n_cnt" : '') .
 686                             " @@\n");
 687                 my $display_head = $head;
 688                 unshift @{$hunk->{TEXT}}, $head;
 689                 if ($diff_use_color) {
 690                         $display_head = colored($fraginfo_color, $head);
 691                 }
 692                 unshift @{$hunk->{DISPLAY}}, $display_head;
 693         }
 694         return @split;
 695 }
 696
 697
 698 sub color_diff {
 699         return map {
 700                 colored((/^@/  ? $fraginfo_color :
 701                          /^\+/ ? $diff_new_color :
 702                          /^-/  ? $diff_old_color :
 703                          $diff_plain_color),
 704                         $_);
 705         } @_;
 706 }
 707
 708 sub edit_hunk_manually {
 709         my ($oldtext) = @_;
 710
 711         my $hunkfile = $repo->repo_path . "/addp-hunk-edit.diff";
 712         my $fh;
 713         open $fh, '>', $hunkfile
 714                 or die "failed to open hunk edit file for writing: " . $!;
 715         print $fh "# Manual hunk edit mode -- see bottom for a quick guide\n";
 716         print $fh @$oldtext;
 717         print $fh <<EOF;
 718 # ---
 719 # To remove '-' lines, make them ' ' lines (context).
 720 # To remove '+' lines, delete them.
 721 # Lines starting with # will be removed.
 722 #
 723 # If the patch applies cleanly, the edited hunk will immediately be
 724 # marked for staging. If it does not apply cleanly, you will be given
 725 # an opportunity to edit again. If all lines of the hunk are removed,
 726 # then the edit is aborted and the hunk is left unchanged.
 727 EOF
 728         close $fh;
 729
 730         my $editor = $ENV{GIT_EDITOR} || $repo->config("core.editor")
 731                 || $ENV{VISUAL} || $ENV{EDITOR} || "vi";
 732         system('sh', '-c', $editor.' "$@"', $editor, $hunkfile);
 733
 734         open $fh, '<', $hunkfile
 735                 or die "failed to open hunk edit file for reading: " . $!;
 736         my @newtext = grep { !/^#/ } <$fh>;
 737         close $fh;
 738         unlink $hunkfile;
 739
 740         # Abort if nothing remains
 741         if (!grep { /\S/ } @newtext) {
 742                 return undef;
 743         }
 744
 745         # Reinsert the first hunk header if the user accidentally deleted it
 746         if ($newtext[0] !~ /^@/) {
 747                 unshift @newtext, $oldtext->[0];
 748         }
 749         return \@newtext;
 750 }
 751
 752 sub diff_applies {
 753         my $fh;
 754         open $fh, '| git apply --recount --cached --check';
 755         for my $h (@_) {
 756                 print $fh @{$h->{TEXT}};
 757         }
 758         return close $fh;
 759 }
 760
 761 sub prompt_yesno {
 762         my ($prompt) = @_;
 763         while (1) {
 764                 print colored $prompt_color, $prompt;
 765                 my $line = <STDIN>;
 766                 return 0 if $line =~ /^n/i;
 767                 return 1 if $line =~ /^y/i;
 768         }
 769 }
 770
 771 sub edit_hunk_loop {
 772         my ($head, $hunk, $ix) = @_;
 773         my $text = $hunk->[$ix]->{TEXT};
 774
 775         while (1) {
 776                 $text = edit_hunk_manually($text);
 777                 if (!defined $text) {
 778                         return undef;
 779                 }
 780                 my $newhunk = { TEXT => $text, USE => 1 };
 781                 if (diff_applies($head,
 782                                  @{$hunk}[0..$ix-1],
 783                                  $newhunk,
 784                                  @{$hunk}[$ix+1..$#{$hunk}])) {
 785                         $newhunk->{DISPLAY} = [color_diff(@{$text})];
 786                         return $newhunk;
 787                 }
 788                 else {
 789                         prompt_yesno(
 790                                 'Your edited hunk does not apply. Edit again '
 791                                 . '(saying "no" discards!) [y/n]? '
 792                                 ) or return undef;
 793                 }
 794         }
 795 }
 796
 797 sub help_patch_cmd {
 798         print colored $help_color, <<\EOF ;
 799 y - stage this hunk
 800 n - do not stage this hunk
 801 a - stage this and all the remaining hunks in the file
 802 d - do not stage this hunk nor any of the remaining hunks in the file
 803 g - select a hunk to go to
 804 j - leave this hunk undecided, see next undecided hunk
 805 J - leave this hunk undecided, see next hunk
 806 k - leave this hunk undecided, see previous undecided hunk
 807 K - leave this hunk undecided, see previous hunk
 808 s - split the current hunk into smaller hunks
 809 e - manually edit the current hunk
 810 ? - print help
 811 EOF
 812 }
 813
 814 sub patch_update_cmd {
 815         my @all_mods = list_modified('file-only');
 816         my @mods = grep { !($_->{BINARY}) } @all_mods;
 817         my @them;
 818
 819         if (!@mods) {
 820                 if (@all_mods) {
 821                         print STDERR "Only binary files changed.\n";
 822                 } else {
 823                         print STDERR "No changes.\n";
 824                 }
 825                 return 0;
 826         }
 827         if ($patch_mode) {
 828                 @them = @mods;
 829         }
 830         else {
 831                 @them = list_and_choose({ PROMPT => 'Patch update',
 832                                           HEADER => $status_head, },
 833                                         @mods);
 834         }
 835         for (@them) {
 836                 patch_update_file($_->{VALUE});
 837         }
 838 }
 839
 840 # Generate a one line summary of a hunk.
 841 sub summarize_hunk {
 842         my $rhunk = shift;
 843         my $summary = $rhunk->{TEXT}[0];
 844
 845         # Keep the line numbers, discard extra context.
 846         $summary =~ s/@@(.*?)@@.*/$1 /s;
 847         $summary .= " " x (20 - length $summary);
 848
 849         # Add some user context.
 850         for my $line (@{$rhunk->{TEXT}}) {
 851                 if ($line =~ m/^[+-].*\w/) {
 852                         $summary .= $line;
 853                         last;
 854                 }
 855         }
 856
 857         chomp $summary;
 858         return substr($summary, 0, 80) . "\n";
 859 }
 860
 861
 862 # Print a one-line summary of each hunk in the array ref in
 863 # the first argument, starting wih the index in the 2nd.
 864 sub display_hunks {
 865         my ($hunks, $i) = @_;
 866         my $ctr = 0;
 867         $i ||= 0;
 868         for (; $i < @$hunks && $ctr < 20; $i++, $ctr++) {
 869                 my $status = " ";
 870                 if (defined $hunks->[$i]{USE}) {
 871                         $status = $hunks->[$i]{USE} ? "+" : "-";
 872                 }
 873                 printf "%s%2d: %s",
 874                         $status,
 875                         $i + 1,
 876                         summarize_hunk($hunks->[$i]);
 877         }
 878         return $i;
 879 }
 880
 881 sub patch_update_file {
 882         my ($ix, $num);
 883         my $path = shift;
 884         my ($head, @hunk) = parse_diff($path);
 885         ($head, my $mode) = parse_diff_header($head);
 886         for (@{$head->{DISPLAY}}) {
 887                 print;
 888         }
 889
 890         if (@{$mode->{TEXT}}) {
 891                 while (1) {
 892                         print @{$mode->{DISPLAY}};
 893                         print colored $prompt_color,
 894                                 "Stage mode change [y/n/a/d/?]? ";
 895                         my $line = <STDIN>;
 896                         if ($line =~ /^y/i) {
 897                                 $mode->{USE} = 1;
 898                                 last;
 899                         }
 900                         elsif ($line =~ /^n/i) {
 901                                 $mode->{USE} = 0;
 902                                 last;
 903                         }
 904                         elsif ($line =~ /^a/i) {
 905                                 $_->{USE} = 1 foreach ($mode, @hunk);
 906                                 last;
 907                         }
 908                         elsif ($line =~ /^d/i) {
 909                                 $_->{USE} = 0 foreach ($mode, @hunk);
 910                                 last;
 911                         }
 912                         else {
 913                                 help_patch_cmd('');
 914                                 next;
 915                         }
 916                 }
 917         }
 918
 919         $num = scalar @hunk;
 920         $ix = 0;
 921
 922         while (1) {
 923                 my ($prev, $next, $other, $undecided, $i);
 924                 $other = '';
 925
 926                 if ($num <= $ix) {
 927                         $ix = 0;
 928                 }
 929                 for ($i = 0; $i < $ix; $i++) {
 930                         if (!defined $hunk[$i]{USE}) {
 931                                 $prev = 1;
 932                                 $other .= '/k';
 933                                 last;
 934                         }
 935                 }
 936                 if ($ix) {
 937                         $other .= '/K';
 938                 }
 939                 for ($i = $ix + 1; $i < $num; $i++) {
 940                         if (!defined $hunk[$i]{USE}) {
 941                                 $next = 1;
 942                                 $other .= '/j';
 943                                 last;
 944                         }
 945                 }
 946                 if ($ix < $num - 1) {
 947                         $other .= '/J';
 948                 }
 949                 if ($num > 1) {
 950                         $other .= '/g';
 951                 }
 952                 for ($i = 0; $i < $num; $i++) {
 953                         if (!defined $hunk[$i]{USE}) {
 954                                 $undecided = 1;
 955                                 last;
 956                         }
 957                 }
 958                 last if (!$undecided);
 959
 960                 if (hunk_splittable($hunk[$ix]{TEXT})) {
 961                         $other .= '/s';
 962                 }
 963                 $other .= '/e';
 964                 for (@{$hunk[$ix]{DISPLAY}}) {
 965                         print;
 966                 }
 967                 print colored $prompt_color, "Stage this hunk [y/n/a/d$other/?]? ";
 968                 my $line = <STDIN>;
 969                 if ($line) {
 970                         if ($line =~ /^y/i) {
 971                                 $hunk[$ix]{USE} = 1;
 972                         }
 973                         elsif ($line =~ /^n/i) {
 974                                 $hunk[$ix]{USE} = 0;
 975                         }
 976                         elsif ($line =~ /^a/i) {
 977                                 while ($ix < $num) {
 978                                         if (!defined $hunk[$ix]{USE}) {
 979                                                 $hunk[$ix]{USE} = 1;
 980                                         }
 981                                         $ix++;
 982                                 }
 983                                 next;
 984                         }
 985                         elsif ($other =~ /g/ && $line =~ /^g(.*)/) {
 986                                 my $response = $1;
 987                                 my $no = $ix > 10 ? $ix - 10 : 0;
 988                                 while ($response eq '') {
 989                                         my $extra = "";
 990                                         $no = display_hunks(\@hunk, $no);
 991                                         if ($no < $num) {
 992                                                 $extra = " (<ret> to see more)";
 993                                         }
 994                                         print "go to which hunk$extra? ";
 995                                         $response = <STDIN>;
 996                                         chomp $response;
 997                                 }
 998                                 if ($response !~ /^\s*\d+\s*$/) {
 999                                         print STDERR "Invalid number: '$response'\n";
1000                                 } elsif (0 < $response && $response <= $num) {
1001                                         $ix = $response - 1;
1002                                 } else {
1003                                         print STDERR "Sorry, only $num hunks available.\n";
1004                                 }
1005                                 next;
1006                         }
1007                         elsif ($line =~ /^d/i) {
1008                                 while ($ix < $num) {
1009                                         if (!defined $hunk[$ix]{USE}) {
1010                                                 $hunk[$ix]{USE} = 0;
1011                                         }
1012                                         $ix++;
1013                                 }
1014                                 next;
1015                         }
1016                         elsif ($other =~ /K/ && $line =~ /^K/) {
1017                                 $ix--;
1018                                 next;
1019                         }
1020                         elsif ($other =~ /J/ && $line =~ /^J/) {
1021                                 $ix++;
1022                                 next;
1023                         }
1024                         elsif ($other =~ /k/ && $line =~ /^k/) {
1025                                 while (1) {
1026                                         $ix--;
1027                                         last if (!$ix ||
1028                                                  !defined $hunk[$ix]{USE});
1029                                 }
1030                                 next;
1031                         }
1032                         elsif ($other =~ /j/ && $line =~ /^j/) {
1033                                 while (1) {
1034                                         $ix++;
1035                                         last if ($ix >= $num ||
1036                                                  !defined $hunk[$ix]{USE});
1037                                 }
1038                                 next;
1039                         }
1040                         elsif ($other =~ /s/ && $line =~ /^s/) {
1041                                 my @split = split_hunk($hunk[$ix]{TEXT}, $hunk[$ix]{DISPLAY});
1042                                 if (1 < @split) {
1043                                         print colored $header_color, "Split into ",
1044                                         scalar(@split), " hunks.\n";
1045                                 }
1046                                 splice (@hunk, $ix, 1, @split);
1047                                 $num = scalar @hunk;
1048                                 next;
1049                         }
1050                         elsif ($line =~ /^e/) {
1051                                 my $newhunk = edit_hunk_loop($head, \@hunk, $ix);
1052                                 if (defined $newhunk) {
1053                                         splice @hunk, $ix, 1, $newhunk;
1054                                 }
1055                         }
1056                         else {
1057                                 help_patch_cmd($other);
1058                                 next;
1059                         }
1060                         # soft increment
1061                         while (1) {
1062                                 $ix++;
1063                                 last if ($ix >= $num ||
1064                                          !defined $hunk[$ix]{USE});
1065                         }
1066                 }
1067         }
1068
1069         my $n_lofs = 0;
1070         my @result = ();
1071         if ($mode->{USE}) {
1072                 push @result, @{$mode->{TEXT}};
1073         }
1074         for (@hunk) {
1075                 if ($_->{USE}) {
1076                         push @result, @{$_->{TEXT}};
1077                 }
1078         }
1079
1080         if (@result) {
1081                 my $fh;
1082
1083                 open $fh, '| git apply --cached --recount';
1084                 for (@{$head->{TEXT}}, @result) {
1085                         print $fh $_;
1086                 }
1087                 if (!close $fh) {
1088                         for (@{$head->{TEXT}}, @result) {
1089                                 print STDERR $_;
1090                         }
1091                 }
1092                 refresh();
1093         }
1094
1095         print "\n";
1096 }
1097
1098 sub diff_cmd {
1099         my @mods = list_modified('index-only');
1100         @mods = grep { !($_->{BINARY}) } @mods;
1101         return if (!@mods);
1102         my (@them) = list_and_choose({ PROMPT => 'Review diff',
1103                                      IMMEDIATE => 1,
1104                                      HEADER => $status_head, },
1105                                    @mods);
1106         return if (!@them);
1107         my $reference = is_initial_commit() ? get_empty_tree() : 'HEAD';
1108         system(qw(git diff -p --cached), $reference, '--',
1109                 map { $_->{VALUE} } @them);
1110 }
1111
1112 sub quit_cmd {
1113         print "Bye.\n";
1114         exit(0);
1115 }
1116
1117 sub help_cmd {
1118         print colored $help_color, <<\EOF ;
1119 status        - show paths with changes
1120 update        - add working tree state to the staged set of changes
1121 revert        - revert staged set of changes back to the HEAD version
1122 patch         - pick hunks and update selectively
1123 diff          - view diff between HEAD and index
1124 add untracked - add contents of untracked files to the staged set of changes
1125 EOF
1126 }
1127
1128 sub process_args {
1129         return unless @ARGV;
1130         my $arg = shift @ARGV;
1131         if ($arg eq "--patch") {
1132                 $patch_mode = 1;
1133                 $arg = shift @ARGV or die "missing --";
1134                 die "invalid argument $arg, expecting --"
1135                     unless $arg eq "--";
1136         }
1137         elsif ($arg ne "--") {
1138                 die "invalid argument $arg, expecting --";
1139         }
1140 }
1141
1142 sub main_loop {
1143         my @cmd = ([ 'status', \&status_cmd, ],
1144                    [ 'update', \&update_cmd, ],
1145                    [ 'revert', \&revert_cmd, ],
1146                    [ 'add untracked', \&add_untracked_cmd, ],
1147                    [ 'patch', \&patch_update_cmd, ],
1148                    [ 'diff', \&diff_cmd, ],
1149                    [ 'quit', \&quit_cmd, ],
1150                    [ 'help', \&help_cmd, ],
1151         );
1152         while (1) {
1153                 my ($it) = list_and_choose({ PROMPT => 'What now',
1154                                              SINGLETON => 1,
1155                                              LIST_FLAT => 4,
1156                                              HEADER => '*** Commands ***',
1157                                              ON_EOF => \&quit_cmd,
1158                                              IMMEDIATE => 1 }, @cmd);
1159                 if ($it) {
1160                         eval {
1161                                 $it->[1]->();
1162                         };
1163                         if ($@) {
1164                                 print "$@";
1165                         }
1166                 }
1167         }
1168 }
1169
1170 process_args();
1171 refresh();
1172 if ($patch_mode) {
1173         patch_update_cmd();
1174 }
1175 else {
1176         status_cmd();
1177         main_loop();
1178 }