git-add--interactive.perl

   1 #!/usr/bin/perl -w
   2
   3 use strict;
   4
   5 sub run_cmd_pipe {
   6         my $fh = undef;
   7         open($fh, '-|', @_) or die;
   8         return <$fh>;
   9 }
  10
  11 my ($GIT_DIR) = run_cmd_pipe(qw(git rev-parse --git-dir));
  12
  13 if (!defined $GIT_DIR) {
  14         exit(1); # rev-parse would have already said "not a git repo"
  15 }
  16 chomp($GIT_DIR);
  17
  18 sub refresh {
  19         my $fh;
  20         open $fh, '-|', qw(git update-index --refresh)
  21             or die;
  22         while (<$fh>) {
  23                 ;# ignore 'needs update'
  24         }
  25         close $fh;
  26 }
  27
  28 sub list_untracked {
  29         map {
  30                 chomp $_;
  31                 $_;
  32         }
  33         run_cmd_pipe(qw(git ls-files --others
  34                         --exclude-per-directory=.gitignore),
  35                      "--exclude-from=$GIT_DIR/info/exclude",
  36                      '--', @_);
  37 }
  38
  39 my $status_fmt = '%12s %12s %s';
  40 my $status_head = sprintf($status_fmt, 'staged', 'unstaged', 'path');
  41
  42 # Returns list of hashes, contents of each of which are:
  43 # PRINT:        print message
  44 # VALUE:        pathname
  45 # BINARY:       is a binary path
  46 # INDEX:        is index different from HEAD?
  47 # FILE:         is file different from index?
  48 # INDEX_ADDDEL: is it add/delete between HEAD and index?
  49 # FILE_ADDDEL:  is it add/delete between index and file?
  50
  51 sub list_modified {
  52         my ($only) = @_;
  53         my (%data, @return);
  54         my ($add, $del, $adddel, $file);
  55
  56         for (run_cmd_pipe(qw(git diff-index --cached
  57                              --numstat --summary HEAD))) {
  58                 if (($add, $del, $file) =
  59                     /^([-\d]+)  ([-\d]+)        (.*)/) {
  60                         my ($change, $bin);
  61                         if ($add eq '-' && $del eq '-') {
  62                                 $change = 'binary';
  63                                 $bin = 1;
  64                         }
  65                         else {
  66                                 $change = "+$add/-$del";
  67                         }
  68                         $data{$file} = {
  69                                 INDEX => $change,
  70                                 BINARY => $bin,
  71                                 FILE => 'nothing',
  72                         }
  73                 }
  74                 elsif (($adddel, $file) =
  75                        /^ (create|delete) mode [0-7]+ (.*)$/) {
  76                         $data{$file}{INDEX_ADDDEL} = $adddel;
  77                 }
  78         }
  79
  80         for (run_cmd_pipe(qw(git diff-files --numstat --summary))) {
  81                 if (($add, $del, $file) =
  82                     /^([-\d]+)  ([-\d]+)        (.*)/) {
  83                         if (!exists $data{$file}) {
  84                                 $data{$file} = +{
  85                                         INDEX => 'unchanged',
  86                                         BINARY => 0,
  87                                 };
  88                         }
  89                         my ($change, $bin);
  90                         if ($add eq '-' && $del eq '-') {
  91                                 $change = 'binary';
  92                                 $bin = 1;
  93                         }
  94                         else {
  95                                 $change = "+$add/-$del";
  96                         }
  97                         $data{$file}{FILE} = $change;
  98                         if ($bin) {
  99                                 $data{$file}{BINARY} = 1;
 100                         }
 101                 }
 102                 elsif (($adddel, $file) =
 103                        /^ (create|delete) mode [0-7]+ (.*)$/) {
 104                         $data{$file}{FILE_ADDDEL} = $adddel;
 105                 }
 106         }
 107
 108         for (sort keys %data) {
 109                 my $it = $data{$_};
 110
 111                 if ($only) {
 112                         if ($only eq 'index-only') {
 113                                 next if ($it->{INDEX} eq 'unchanged');
 114                         }
 115                         if ($only eq 'file-only') {
 116                                 next if ($it->{FILE} eq 'nothing');
 117                         }
 118                 }
 119                 push @return, +{
 120                         VALUE => $_,
 121                         PRINT => (sprintf $status_fmt,
 122                                   $it->{INDEX}, $it->{FILE}, $_),
 123                         %$it,
 124                 };
 125         }
 126         return @return;
 127 }
 128
 129 sub find_unique {
 130         my ($string, @stuff) = @_;
 131         my $found = undef;
 132         for (my $i = 0; $i < @stuff; $i++) {
 133                 my $it = $stuff[$i];
 134                 my $hit = undef;
 135                 if (ref $it) {
 136                         if ((ref $it) eq 'ARRAY') {
 137                                 $it = $it->[0];
 138                         }
 139                         else {
 140                                 $it = $it->{VALUE};
 141                         }
 142                 }
 143                 eval {
 144                         if ($it =~ /^$string/) {
 145                                 $hit = 1;
 146                         };
 147                 };
 148                 if (defined $hit && defined $found) {
 149                         return undef;
 150                 }
 151                 if ($hit) {
 152                         $found = $i + 1;
 153                 }
 154         }
 155         return $found;
 156 }
 157
 158 sub list_and_choose {
 159         my ($opts, @stuff) = @_;
 160         my (@chosen, @return);
 161         my $i;
 162
 163       TOPLOOP:
 164         while (1) {
 165                 my $last_lf = 0;
 166
 167                 if ($opts->{HEADER}) {
 168                         if (!$opts->{LIST_FLAT}) {
 169                                 print "     ";
 170                         }
 171                         print "$opts->{HEADER}\n";
 172                 }
 173                 for ($i = 0; $i < @stuff; $i++) {
 174                         my $chosen = $chosen[$i] ? '*' : ' ';
 175                         my $print = $stuff[$i];
 176                         if (ref $print) {
 177                                 if ((ref $print) eq 'ARRAY') {
 178                                         $print = $print->[0];
 179                                 }
 180                                 else {
 181                                         $print = $print->{PRINT};
 182                                 }
 183                         }
 184                         printf("%s%2d: %s", $chosen, $i+1, $print);
 185                         if (($opts->{LIST_FLAT}) &&
 186                             (($i + 1) % ($opts->{LIST_FLAT}))) {
 187                                 print "\t";
 188                                 $last_lf = 0;
 189                         }
 190                         else {
 191                                 print "\n";
 192                                 $last_lf = 1;
 193                         }
 194                 }
 195                 if (!$last_lf) {
 196                         print "\n";
 197                 }
 198
 199                 return if ($opts->{LIST_ONLY});
 200
 201                 print $opts->{PROMPT};
 202                 if ($opts->{SINGLETON}) {
 203                         print "> ";
 204                 }
 205                 else {
 206                         print ">> ";
 207                 }
 208                 my $line = <STDIN>;
 209                 last if (!$line);
 210                 chomp $line;
 211                 my $donesomething = 0;
 212                 for my $choice (split(/[\s,]+/, $line)) {
 213                         my $choose = 1;
 214                         my ($bottom, $top);
 215
 216                         # Input that begins with '-'; unchoose
 217                         if ($choice =~ s/^-//) {
 218                                 $choose = 0;
 219                         }
 220                         # A range can be specified like 5-7
 221                         if ($choice =~ /^(\d+)-(\d+)$/) {
 222                                 ($bottom, $top) = ($1, $2);
 223                         }
 224                         elsif ($choice =~ /^\d+$/) {
 225                                 $bottom = $top = $choice;
 226                         }
 227                         elsif ($choice eq '*') {
 228                                 $bottom = 1;
 229                                 $top = 1 + @stuff;
 230                         }
 231                         else {
 232                                 $bottom = $top = find_unique($choice, @stuff);
 233                                 if (!defined $bottom) {
 234                                         print "Huh ($choice)?\n";
 235                                         next TOPLOOP;
 236                                 }
 237                         }
 238                         if ($opts->{SINGLETON} && $bottom != $top) {
 239                                 print "Huh ($choice)?\n";
 240                                 next TOPLOOP;
 241                         }
 242                         for ($i = $bottom-1; $i <= $top-1; $i++) {
 243                                 next if (@stuff <= $i);
 244                                 $chosen[$i] = $choose;
 245                                 $donesomething++;
 246                         }
 247                 }
 248                 last if (!$donesomething || $opts->{IMMEDIATE});
 249         }
 250         for ($i = 0; $i < @stuff; $i++) {
 251                 if ($chosen[$i]) {
 252                         push @return, $stuff[$i];
 253                 }
 254         }
 255         return @return;
 256 }
 257
 258 sub status_cmd {
 259         list_and_choose({ LIST_ONLY => 1, HEADER => $status_head },
 260                         list_modified());
 261         print "\n";
 262 }
 263
 264 sub say_n_paths {
 265         my $did = shift @_;
 266         my $cnt = scalar @_;
 267         print "$did ";
 268         if (1 < $cnt) {
 269                 print "$cnt paths\n";
 270         }
 271         else {
 272                 print "one path\n";
 273         }
 274 }
 275
 276 sub update_cmd {
 277         my @mods = list_modified('file-only');
 278         return if (!@mods);
 279
 280         my @update = list_and_choose({ PROMPT => 'Update',
 281                                        HEADER => $status_head, },
 282                                      @mods);
 283         if (@update) {
 284                 system(qw(git update-index --add --remove --),
 285                        map { $_->{VALUE} } @update);
 286                 say_n_paths('updated', @update);
 287         }
 288         print "\n";
 289 }
 290
 291 sub revert_cmd {
 292         my @update = list_and_choose({ PROMPT => 'Revert',
 293                                        HEADER => $status_head, },
 294                                      list_modified());
 295         if (@update) {
 296                 my @lines = run_cmd_pipe(qw(git ls-tree HEAD --),
 297                                          map { $_->{VALUE} } @update);
 298                 my $fh;
 299                 open $fh, '|-', qw(git update-index --index-info)
 300                     or die;
 301                 for (@lines) {
 302                         print $fh $_;
 303                 }
 304                 close($fh);
 305                 for (@update) {
 306                         if ($_->{INDEX_ADDDEL} &&
 307                             $_->{INDEX_ADDDEL} eq 'create') {
 308                                 system(qw(git update-index --force-remove --),
 309                                        $_->{VALUE});
 310                                 print "note: $_->{VALUE} is untracked now.\n";
 311                         }
 312                 }
 313                 refresh();
 314                 say_n_paths('reverted', @update);
 315         }
 316         print "\n";
 317 }
 318
 319 sub add_untracked_cmd {
 320         my @add = list_and_choose({ PROMPT => 'Add untracked' },
 321                                   list_untracked());
 322         if (@add) {
 323                 system(qw(git update-index --add --), @add);
 324                 say_n_paths('added', @add);
 325         }
 326         print "\n";
 327 }
 328
 329 sub parse_diff {
 330         my ($path) = @_;
 331         my @diff = run_cmd_pipe(qw(git diff-files -p --), $path);
 332         my (@hunk) = { TEXT => [] };
 333
 334         for (@diff) {
 335                 if (/^@@ /) {
 336                         push @hunk, { TEXT => [] };
 337                 }
 338                 push @{$hunk[-1]{TEXT}}, $_;
 339         }
 340         return @hunk;
 341 }
 342
 343 sub hunk_splittable {
 344         my ($text) = @_;
 345
 346         my @s = split_hunk($text);
 347         return (1 < @s);
 348 }
 349
 350 sub parse_hunk_header {
 351         my ($line) = @_;
 352         my ($o_ofs, $o_cnt, $n_ofs, $n_cnt) =
 353             $line =~ /^@@ -(\d+)(?:,(\d+)) \+(\d+)(?:,(\d+)) @@/;
 354         return ($o_ofs, $o_cnt, $n_ofs, $n_cnt);
 355 }
 356
 357 sub split_hunk {
 358         my ($text) = @_;
 359         my @split = ();
 360
 361         # If there are context lines in the middle of a hunk,
 362         # it can be split, but we would need to take care of
 363         # overlaps later.
 364
 365         my ($o_ofs, $o_cnt, $n_ofs, $n_cnt) = parse_hunk_header($text->[0]);
 366         my $hunk_start = 1;
 367         my $next_hunk_start;
 368
 369       OUTER:
 370         while (1) {
 371                 my $next_hunk_start = undef;
 372                 my $i = $hunk_start - 1;
 373                 my $this = +{
 374                         TEXT => [],
 375                         OLD => $o_ofs,
 376                         NEW => $n_ofs,
 377                         OCNT => 0,
 378                         NCNT => 0,
 379                         ADDDEL => 0,
 380                         POSTCTX => 0,
 381                 };
 382
 383                 while (++$i < @$text) {
 384                         my $line = $text->[$i];
 385                         if ($line =~ /^ /) {
 386                                 if ($this->{ADDDEL} &&
 387                                     !defined $next_hunk_start) {
 388                                         # We have seen leading context and
 389                                         # adds/dels and then here is another
 390                                         # context, which is trailing for this
 391                                         # split hunk and leading for the next
 392                                         # one.
 393                                         $next_hunk_start = $i;
 394                                 }
 395                                 push @{$this->{TEXT}}, $line;
 396                                 $this->{OCNT}++;
 397                                 $this->{NCNT}++;
 398                                 if (defined $next_hunk_start) {
 399                                         $this->{POSTCTX}++;
 400                                 }
 401                                 next;
 402                         }
 403
 404                         # add/del
 405                         if (defined $next_hunk_start) {
 406                                 # We are done with the current hunk and
 407                                 # this is the first real change for the
 408                                 # next split one.
 409                                 $hunk_start = $next_hunk_start;
 410                                 $o_ofs = $this->{OLD} + $this->{OCNT};
 411                                 $n_ofs = $this->{NEW} + $this->{NCNT};
 412                                 $o_ofs -= $this->{POSTCTX};
 413                                 $n_ofs -= $this->{POSTCTX};
 414                                 push @split, $this;
 415                                 redo OUTER;
 416                         }
 417                         push @{$this->{TEXT}}, $line;
 418                         $this->{ADDDEL}++;
 419                         if ($line =~ /^-/) {
 420                                 $this->{OCNT}++;
 421                         }
 422                         else {
 423                                 $this->{NCNT}++;
 424                         }
 425                 }
 426
 427                 push @split, $this;
 428                 last;
 429         }
 430
 431         for my $hunk (@split) {
 432                 $o_ofs = $hunk->{OLD};
 433                 $n_ofs = $hunk->{NEW};
 434                 $o_cnt = $hunk->{OCNT};
 435                 $n_cnt = $hunk->{NCNT};
 436
 437                 my $head = ("@@ -$o_ofs" .
 438                             (($o_cnt != 1) ? ",$o_cnt" : '') .
 439                             " +$n_ofs" .
 440                             (($n_cnt != 1) ? ",$n_cnt" : '') .
 441                             " @@\n");
 442                 unshift @{$hunk->{TEXT}}, $head;
 443         }
 444         return map { $_->{TEXT} } @split;
 445 }
 446
 447 sub find_last_o_ctx {
 448         my ($it) = @_;
 449         my $text = $it->{TEXT};
 450         my ($o_ofs, $o_cnt, $n_ofs, $n_cnt) = parse_hunk_header($text->[0]);
 451         my $i = @{$text};
 452         my $last_o_ctx = $o_ofs + $o_cnt;
 453         while (0 < --$i) {
 454                 my $line = $text->[$i];
 455                 if ($line =~ /^ /) {
 456                         $last_o_ctx--;
 457                         next;
 458                 }
 459                 last;
 460         }
 461         return $last_o_ctx;
 462 }
 463
 464 sub merge_hunk {
 465         my ($prev, $this) = @_;
 466         my ($o0_ofs, $o0_cnt, $n0_ofs, $n0_cnt) =
 467             parse_hunk_header($prev->{TEXT}[0]);
 468         my ($o1_ofs, $o1_cnt, $n1_ofs, $n1_cnt) =
 469             parse_hunk_header($this->{TEXT}[0]);
 470
 471         my (@line, $i, $ofs, $o_cnt, $n_cnt);
 472         $ofs = $o0_ofs;
 473         $o_cnt = $n_cnt = 0;
 474         for ($i = 1; $i < @{$prev->{TEXT}}; $i++) {
 475                 my $line = $prev->{TEXT}[$i];
 476                 if ($line =~ /^\+/) {
 477                         $n_cnt++;
 478                         push @line, $line;
 479                         next;
 480                 }
 481
 482                 last if ($o1_ofs <= $ofs);
 483
 484                 $o_cnt++;
 485                 $ofs++;
 486                 if ($line =~ /^ /) {
 487                         $n_cnt++;
 488                 }
 489                 push @line, $line;
 490         }
 491
 492         for ($i = 1; $i < @{$this->{TEXT}}; $i++) {
 493                 my $line = $this->{TEXT}[$i];
 494                 if ($line =~ /^\+/) {
 495                         $n_cnt++;
 496                         push @line, $line;
 497                         next;
 498                 }
 499                 $ofs++;
 500                 $o_cnt++;
 501                 if ($line =~ /^ /) {
 502                         $n_cnt++;
 503                 }
 504                 push @line, $line;
 505         }
 506         my $head = ("@@ -$o0_ofs" .
 507                     (($o_cnt != 1) ? ",$o_cnt" : '') .
 508                     " +$n0_ofs" .
 509                     (($n_cnt != 1) ? ",$n_cnt" : '') .
 510                     " @@\n");
 511         @{$prev->{TEXT}} = ($head, @line);
 512 }
 513
 514 sub coalesce_overlapping_hunks {
 515         my (@in) = @_;
 516         my @out = ();
 517
 518         my ($last_o_ctx);
 519
 520         for (grep { $_->{USE} } @in) {
 521                 my $text = $_->{TEXT};
 522                 my ($o_ofs, $o_cnt, $n_ofs, $n_cnt) =
 523                     parse_hunk_header($text->[0]);
 524                 if (defined $last_o_ctx &&
 525                     $o_ofs <= $last_o_ctx) {
 526                         merge_hunk($out[-1], $_);
 527                 }
 528                 else {
 529                         push @out, $_;
 530                 }
 531                 $last_o_ctx = find_last_o_ctx($out[-1]);
 532         }
 533         return @out;
 534 }
 535
 536 sub help_patch_cmd {
 537         print <<\EOF ;
 538 y - stage this hunk
 539 n - do not stage this hunk
 540 a - stage this and all the remaining hunks
 541 d - do not stage this hunk nor any of the remaining hunks
 542 j - leave this hunk undecided, see next undecided hunk
 543 J - leave this hunk undecided, see next hunk
 544 k - leave this hunk undecided, see previous undecided hunk
 545 K - leave this hunk undecided, see previous hunk
 546 s - split the current hunk into smaller hunks
 547 EOF
 548 }
 549
 550 sub patch_update_cmd {
 551         my @mods = list_modified('file-only');
 552         @mods = grep { !($_->{BINARY}) } @mods;
 553         return if (!@mods);
 554
 555         my ($it) = list_and_choose({ PROMPT => 'Patch update',
 556                                      SINGLETON => 1,
 557                                      IMMEDIATE => 1,
 558                                      HEADER => $status_head, },
 559                                    @mods);
 560         return if (!$it);
 561
 562         my ($ix, $num);
 563         my $path = $it->{VALUE};
 564         my ($head, @hunk) = parse_diff($path);
 565         for (@{$head->{TEXT}}) {
 566                 print;
 567         }
 568         $num = scalar @hunk;
 569         $ix = 0;
 570
 571         while (1) {
 572                 my ($prev, $next, $other, $undecided, $i);
 573                 $other = '';
 574
 575                 if ($num <= $ix) {
 576                         $ix = 0;
 577                 }
 578                 for ($i = 0; $i < $ix; $i++) {
 579                         if (!defined $hunk[$i]{USE}) {
 580                                 $prev = 1;
 581                                 $other .= '/k';
 582                                 last;
 583                         }
 584                 }
 585                 if ($ix) {
 586                         $other .= '/K';
 587                 }
 588                 for ($i = $ix + 1; $i < $num; $i++) {
 589                         if (!defined $hunk[$i]{USE}) {
 590                                 $next = 1;
 591                                 $other .= '/j';
 592                                 last;
 593                         }
 594                 }
 595                 if ($ix < $num - 1) {
 596                         $other .= '/J';
 597                 }
 598                 for ($i = 0; $i < $num; $i++) {
 599                         if (!defined $hunk[$i]{USE}) {
 600                                 $undecided = 1;
 601                                 last;
 602                         }
 603                 }
 604                 last if (!$undecided);
 605
 606                 if (hunk_splittable($hunk[$ix]{TEXT})) {
 607                         $other .= '/s';
 608                 }
 609                 for (@{$hunk[$ix]{TEXT}}) {
 610                         print;
 611                 }
 612                 print "Stage this hunk [y/n/a/d$other/?]? ";
 613                 my $line = <STDIN>;
 614                 if ($line) {
 615                         if ($line =~ /^y/i) {
 616                                 $hunk[$ix]{USE} = 1;
 617                         }
 618                         elsif ($line =~ /^n/i) {
 619                                 $hunk[$ix]{USE} = 0;
 620                         }
 621                         elsif ($line =~ /^a/i) {
 622                                 while ($ix < $num) {
 623                                         if (!defined $hunk[$ix]{USE}) {
 624                                                 $hunk[$ix]{USE} = 1;
 625                                         }
 626                                         $ix++;
 627                                 }
 628                                 next;
 629                         }
 630                         elsif ($line =~ /^d/i) {
 631                                 while ($ix < $num) {
 632                                         if (!defined $hunk[$ix]{USE}) {
 633                                                 $hunk[$ix]{USE} = 0;
 634                                         }
 635                                         $ix++;
 636                                 }
 637                                 next;
 638                         }
 639                         elsif ($other =~ /K/ && $line =~ /^K/) {
 640                                 $ix--;
 641                                 next;
 642                         }
 643                         elsif ($other =~ /J/ && $line =~ /^J/) {
 644                                 $ix++;
 645                                 next;
 646                         }
 647                         elsif ($other =~ /k/ && $line =~ /^k/) {
 648                                 while (1) {
 649                                         $ix--;
 650                                         last if (!$ix ||
 651                                                  !defined $hunk[$ix]{USE});
 652                                 }
 653                                 next;
 654                         }
 655                         elsif ($other =~ /j/ && $line =~ /^j/) {
 656                                 while (1) {
 657                                         $ix++;
 658                                         last if ($ix >= $num ||
 659                                                  !defined $hunk[$ix]{USE});
 660                                 }
 661                                 next;
 662                         }
 663                         elsif ($other =~ /s/ && $line =~ /^s/) {
 664                                 my @split = split_hunk($hunk[$ix]{TEXT});
 665                                 if (1 < @split) {
 666                                         print "Split into ",
 667                                         scalar(@split), " hunks.\n";
 668                                 }
 669                                 splice(@hunk, $ix, 1,
 670                                        map { +{ TEXT => $_, USE => undef } }
 671                                        @split);
 672                                 $num = scalar @hunk;
 673                                 next;
 674                         }
 675                         else {
 676                                 help_patch_cmd($other);
 677                                 next;
 678                         }
 679                         # soft increment
 680                         while (1) {
 681                                 $ix++;
 682                                 last if ($ix >= $num ||
 683                                          !defined $hunk[$ix]{USE});
 684                         }
 685                 }
 686         }
 687
 688         @hunk = coalesce_overlapping_hunks(@hunk);
 689
 690         my ($o_lofs, $n_lofs) = (0, 0);
 691         my @result = ();
 692         for (@hunk) {
 693                 my $text = $_->{TEXT};
 694                 my ($o_ofs, $o_cnt, $n_ofs, $n_cnt) =
 695                     parse_hunk_header($text->[0]);
 696
 697                 if (!$_->{USE}) {
 698                         if (!defined $o_cnt) { $o_cnt = 1; }
 699                         if (!defined $n_cnt) { $n_cnt = 1; }
 700
 701                         # We would have added ($n_cnt - $o_cnt) lines
 702                         # to the postimage if we were to use this hunk,
 703                         # but we didn't.  So the line number that the next
 704                         # hunk starts at would be shifted by that much.
 705                         $n_lofs -= ($n_cnt - $o_cnt);
 706                         next;
 707                 }
 708                 else {
 709                         if ($n_lofs) {
 710                                 $n_ofs += $n_lofs;
 711                                 $text->[0] = ("@@ -$o_ofs" .
 712                                               ((defined $o_cnt)
 713                                                ? ",$o_cnt" : '') .
 714                                               " +$n_ofs" .
 715                                               ((defined $n_cnt)
 716                                                ? ",$n_cnt" : '') .
 717                                               " @@\n");
 718                         }
 719                         for (@$text) {
 720                                 push @result, $_;
 721                         }
 722                 }
 723         }
 724
 725         if (@result) {
 726                 my $fh;
 727
 728                 open $fh, '|-', qw(git apply --cached);
 729                 for (@{$head->{TEXT}}, @result) {
 730                         print $fh $_;
 731                 }
 732                 if (!close $fh) {
 733                         for (@{$head->{TEXT}}, @result) {
 734                                 print STDERR $_;
 735                         }
 736                 }
 737                 refresh();
 738         }
 739
 740         print "\n";
 741 }
 742
 743 sub diff_cmd {
 744         my @mods = list_modified('index-only');
 745         @mods = grep { !($_->{BINARY}) } @mods;
 746         return if (!@mods);
 747         my (@them) = list_and_choose({ PROMPT => 'Review diff',
 748                                      IMMEDIATE => 1,
 749                                      HEADER => $status_head, },
 750                                    @mods);
 751         return if (!@them);
 752         system(qw(git diff-index -p --cached HEAD --),
 753                map { $_->{VALUE} } @them);
 754 }
 755
 756 sub quit_cmd {
 757         print "Bye.\n";
 758         exit(0);
 759 }
 760
 761 sub help_cmd {
 762         print <<\EOF ;
 763 status        - show paths with changes
 764 update        - add working tree state to the staged set of changes
 765 revert        - revert staged set of changes back to the HEAD version
 766 patch         - pick hunks and update selectively
 767 diff          - view diff between HEAD and index
 768 add untracked - add contents of untracked files to the staged set of changes
 769 EOF
 770 }
 771
 772 sub main_loop {
 773         my @cmd = ([ 'status', \&status_cmd, ],
 774                    [ 'update', \&update_cmd, ],
 775                    [ 'revert', \&revert_cmd, ],
 776                    [ 'add untracked', \&add_untracked_cmd, ],
 777                    [ 'patch', \&patch_update_cmd, ],
 778                    [ 'diff', \&diff_cmd, ],
 779                    [ 'quit', \&quit_cmd, ],
 780                    [ 'help', \&help_cmd, ],
 781         );
 782         while (1) {
 783                 my ($it) = list_and_choose({ PROMPT => 'What now',
 784                                              SINGLETON => 1,
 785                                              LIST_FLAT => 4,
 786                                              HEADER => '*** Commands ***',
 787                                              IMMEDIATE => 1 }, @cmd);
 788                 if ($it) {
 789                         eval {
 790                                 $it->[1]->();
 791                         };
 792                         if ($@) {
 793                                 print "$@";
 794                         }
 795                 }
 796         }
 797 }
 798
 799 my @z;
 800
 801 refresh();
 802 status_cmd();
 803 main_loop();