Test suite: reset TERM to its previous value after testing.
[git] / git-add--interactive.perl
1 #!/usr/bin/perl -w
2
3 use strict;
4
5 sub run_cmd_pipe {
6         if ($^O eq 'MSWin32') {
7                 my @invalid = grep {m/[":*]/} @_;
8                 die "$^O does not support: @invalid\n" if @invalid;
9                 my @args = map { m/ /o ? "\"$_\"": $_ } @_;
10                 return qx{@args};
11         } else {
12                 my $fh = undef;
13                 open($fh, '-|', @_) or die;
14                 return <$fh>;
15         }
16 }
17
18 my ($GIT_DIR) = run_cmd_pipe(qw(git rev-parse --git-dir));
19
20 if (!defined $GIT_DIR) {
21         exit(1); # rev-parse would have already said "not a git repo"
22 }
23 chomp($GIT_DIR);
24
25 sub refresh {
26         my $fh;
27         open $fh, 'git update-index --refresh |'
28             or die;
29         while (<$fh>) {
30                 ;# ignore 'needs update'
31         }
32         close $fh;
33 }
34
35 sub list_untracked {
36         map {
37                 chomp $_;
38                 $_;
39         }
40         run_cmd_pipe(qw(git ls-files --others
41                         --exclude-per-directory=.gitignore),
42                      "--exclude-from=$GIT_DIR/info/exclude",
43                      '--', @_);
44 }
45
46 my $status_fmt = '%12s %12s %s';
47 my $status_head = sprintf($status_fmt, 'staged', 'unstaged', 'path');
48
49 # Returns list of hashes, contents of each of which are:
50 # PRINT:        print message
51 # VALUE:        pathname
52 # BINARY:       is a binary path
53 # INDEX:        is index different from HEAD?
54 # FILE:         is file different from index?
55 # INDEX_ADDDEL: is it add/delete between HEAD and index?
56 # FILE_ADDDEL:  is it add/delete between index and file?
57
58 sub list_modified {
59         my ($only) = @_;
60         my (%data, @return);
61         my ($add, $del, $adddel, $file);
62
63         for (run_cmd_pipe(qw(git diff-index --cached
64                              --numstat --summary HEAD))) {
65                 if (($add, $del, $file) =
66                     /^([-\d]+)  ([-\d]+)        (.*)/) {
67                         my ($change, $bin);
68                         if ($add eq '-' && $del eq '-') {
69                                 $change = 'binary';
70                                 $bin = 1;
71                         }
72                         else {
73                                 $change = "+$add/-$del";
74                         }
75                         $data{$file} = {
76                                 INDEX => $change,
77                                 BINARY => $bin,
78                                 FILE => 'nothing',
79                         }
80                 }
81                 elsif (($adddel, $file) =
82                        /^ (create|delete) mode [0-7]+ (.*)$/) {
83                         $data{$file}{INDEX_ADDDEL} = $adddel;
84                 }
85         }
86
87         for (run_cmd_pipe(qw(git diff-files --numstat --summary))) {
88                 if (($add, $del, $file) =
89                     /^([-\d]+)  ([-\d]+)        (.*)/) {
90                         if (!exists $data{$file}) {
91                                 $data{$file} = +{
92                                         INDEX => 'unchanged',
93                                         BINARY => 0,
94                                 };
95                         }
96                         my ($change, $bin);
97                         if ($add eq '-' && $del eq '-') {
98                                 $change = 'binary';
99                                 $bin = 1;
100                         }
101                         else {
102                                 $change = "+$add/-$del";
103                         }
104                         $data{$file}{FILE} = $change;
105                         if ($bin) {
106                                 $data{$file}{BINARY} = 1;
107                         }
108                 }
109                 elsif (($adddel, $file) =
110                        /^ (create|delete) mode [0-7]+ (.*)$/) {
111                         $data{$file}{FILE_ADDDEL} = $adddel;
112                 }
113         }
114
115         for (sort keys %data) {
116                 my $it = $data{$_};
117
118                 if ($only) {
119                         if ($only eq 'index-only') {
120                                 next if ($it->{INDEX} eq 'unchanged');
121                         }
122                         if ($only eq 'file-only') {
123                                 next if ($it->{FILE} eq 'nothing');
124                         }
125                 }
126                 push @return, +{
127                         VALUE => $_,
128                         PRINT => (sprintf $status_fmt,
129                                   $it->{INDEX}, $it->{FILE}, $_),
130                         %$it,
131                 };
132         }
133         return @return;
134 }
135
136 sub find_unique {
137         my ($string, @stuff) = @_;
138         my $found = undef;
139         for (my $i = 0; $i < @stuff; $i++) {
140                 my $it = $stuff[$i];
141                 my $hit = undef;
142                 if (ref $it) {
143                         if ((ref $it) eq 'ARRAY') {
144                                 $it = $it->[0];
145                         }
146                         else {
147                                 $it = $it->{VALUE};
148                         }
149                 }
150                 eval {
151                         if ($it =~ /^$string/) {
152                                 $hit = 1;
153                         };
154                 };
155                 if (defined $hit && defined $found) {
156                         return undef;
157                 }
158                 if ($hit) {
159                         $found = $i + 1;
160                 }
161         }
162         return $found;
163 }
164
165 sub list_and_choose {
166         my ($opts, @stuff) = @_;
167         my (@chosen, @return);
168         my $i;
169
170       TOPLOOP:
171         while (1) {
172                 my $last_lf = 0;
173
174                 if ($opts->{HEADER}) {
175                         if (!$opts->{LIST_FLAT}) {
176                                 print "     ";
177                         }
178                         print "$opts->{HEADER}\n";
179                 }
180                 for ($i = 0; $i < @stuff; $i++) {
181                         my $chosen = $chosen[$i] ? '*' : ' ';
182                         my $print = $stuff[$i];
183                         if (ref $print) {
184                                 if ((ref $print) eq 'ARRAY') {
185                                         $print = $print->[0];
186                                 }
187                                 else {
188                                         $print = $print->{PRINT};
189                                 }
190                         }
191                         printf("%s%2d: %s", $chosen, $i+1, $print);
192                         if (($opts->{LIST_FLAT}) &&
193                             (($i + 1) % ($opts->{LIST_FLAT}))) {
194                                 print "\t";
195                                 $last_lf = 0;
196                         }
197                         else {
198                                 print "\n";
199                                 $last_lf = 1;
200                         }
201                 }
202                 if (!$last_lf) {
203                         print "\n";
204                 }
205
206                 return if ($opts->{LIST_ONLY});
207
208                 print $opts->{PROMPT};
209                 if ($opts->{SINGLETON}) {
210                         print "> ";
211                 }
212                 else {
213                         print ">> ";
214                 }
215                 my $line = <STDIN>;
216                 if (!$line) {
217                         print "\n";
218                         $opts->{ON_EOF}->() if $opts->{ON_EOF};
219                         last;
220                 }
221                 chomp $line;
222                 last if $line eq '';
223                 for my $choice (split(/[\s,]+/, $line)) {
224                         my $choose = 1;
225                         my ($bottom, $top);
226
227                         # Input that begins with '-'; unchoose
228                         if ($choice =~ s/^-//) {
229                                 $choose = 0;
230                         }
231                         # A range can be specified like 5-7
232                         if ($choice =~ /^(\d+)-(\d+)$/) {
233                                 ($bottom, $top) = ($1, $2);
234                         }
235                         elsif ($choice =~ /^\d+$/) {
236                                 $bottom = $top = $choice;
237                         }
238                         elsif ($choice eq '*') {
239                                 $bottom = 1;
240                                 $top = 1 + @stuff;
241                         }
242                         else {
243                                 $bottom = $top = find_unique($choice, @stuff);
244                                 if (!defined $bottom) {
245                                         print "Huh ($choice)?\n";
246                                         next TOPLOOP;
247                                 }
248                         }
249                         if ($opts->{SINGLETON} && $bottom != $top) {
250                                 print "Huh ($choice)?\n";
251                                 next TOPLOOP;
252                         }
253                         for ($i = $bottom-1; $i <= $top-1; $i++) {
254                                 next if (@stuff <= $i || $i < 0);
255                                 $chosen[$i] = $choose;
256                         }
257                 }
258                 last if ($opts->{IMMEDIATE});
259         }
260         for ($i = 0; $i < @stuff; $i++) {
261                 if ($chosen[$i]) {
262                         push @return, $stuff[$i];
263                 }
264         }
265         return @return;
266 }
267
268 sub status_cmd {
269         list_and_choose({ LIST_ONLY => 1, HEADER => $status_head },
270                         list_modified());
271         print "\n";
272 }
273
274 sub say_n_paths {
275         my $did = shift @_;
276         my $cnt = scalar @_;
277         print "$did ";
278         if (1 < $cnt) {
279                 print "$cnt paths\n";
280         }
281         else {
282                 print "one path\n";
283         }
284 }
285
286 sub update_cmd {
287         my @mods = list_modified('file-only');
288         return if (!@mods);
289
290         my @update = list_and_choose({ PROMPT => 'Update',
291                                        HEADER => $status_head, },
292                                      @mods);
293         if (@update) {
294                 system(qw(git update-index --add --remove --),
295                        map { $_->{VALUE} } @update);
296                 say_n_paths('updated', @update);
297         }
298         print "\n";
299 }
300
301 sub revert_cmd {
302         my @update = list_and_choose({ PROMPT => 'Revert',
303                                        HEADER => $status_head, },
304                                      list_modified());
305         if (@update) {
306                 my @lines = run_cmd_pipe(qw(git ls-tree HEAD --),
307                                          map { $_->{VALUE} } @update);
308                 my $fh;
309                 open $fh, '| git update-index --index-info'
310                     or die;
311                 for (@lines) {
312                         print $fh $_;
313                 }
314                 close($fh);
315                 for (@update) {
316                         if ($_->{INDEX_ADDDEL} &&
317                             $_->{INDEX_ADDDEL} eq 'create') {
318                                 system(qw(git update-index --force-remove --),
319                                        $_->{VALUE});
320                                 print "note: $_->{VALUE} is untracked now.\n";
321                         }
322                 }
323                 refresh();
324                 say_n_paths('reverted', @update);
325         }
326         print "\n";
327 }
328
329 sub add_untracked_cmd {
330         my @add = list_and_choose({ PROMPT => 'Add untracked' },
331                                   list_untracked());
332         if (@add) {
333                 system(qw(git update-index --add --), @add);
334                 say_n_paths('added', @add);
335         }
336         print "\n";
337 }
338
339 sub parse_diff {
340         my ($path) = @_;
341         my @diff = run_cmd_pipe(qw(git diff-files -p --), $path);
342         my (@hunk) = { TEXT => [] };
343
344         for (@diff) {
345                 if (/^@@ /) {
346                         push @hunk, { TEXT => [] };
347                 }
348                 push @{$hunk[-1]{TEXT}}, $_;
349         }
350         return @hunk;
351 }
352
353 sub hunk_splittable {
354         my ($text) = @_;
355
356         my @s = split_hunk($text);
357         return (1 < @s);
358 }
359
360 sub parse_hunk_header {
361         my ($line) = @_;
362         my ($o_ofs, $o_cnt, $n_ofs, $n_cnt) =
363             $line =~ /^@@ -(\d+)(?:,(\d+))? \+(\d+)(?:,(\d+))? @@/;
364         $o_cnt = 1 unless defined $o_cnt;
365         $n_cnt = 1 unless defined $n_cnt;
366         return ($o_ofs, $o_cnt, $n_ofs, $n_cnt);
367 }
368
369 sub split_hunk {
370         my ($text) = @_;
371         my @split = ();
372
373         # If there are context lines in the middle of a hunk,
374         # it can be split, but we would need to take care of
375         # overlaps later.
376
377         my ($o_ofs, undef, $n_ofs) = parse_hunk_header($text->[0]);
378         my $hunk_start = 1;
379
380       OUTER:
381         while (1) {
382                 my $next_hunk_start = undef;
383                 my $i = $hunk_start - 1;
384                 my $this = +{
385                         TEXT => [],
386                         OLD => $o_ofs,
387                         NEW => $n_ofs,
388                         OCNT => 0,
389                         NCNT => 0,
390                         ADDDEL => 0,
391                         POSTCTX => 0,
392                 };
393
394                 while (++$i < @$text) {
395                         my $line = $text->[$i];
396                         if ($line =~ /^ /) {
397                                 if ($this->{ADDDEL} &&
398                                     !defined $next_hunk_start) {
399                                         # We have seen leading context and
400                                         # adds/dels and then here is another
401                                         # context, which is trailing for this
402                                         # split hunk and leading for the next
403                                         # one.
404                                         $next_hunk_start = $i;
405                                 }
406                                 push @{$this->{TEXT}}, $line;
407                                 $this->{OCNT}++;
408                                 $this->{NCNT}++;
409                                 if (defined $next_hunk_start) {
410                                         $this->{POSTCTX}++;
411                                 }
412                                 next;
413                         }
414
415                         # add/del
416                         if (defined $next_hunk_start) {
417                                 # We are done with the current hunk and
418                                 # this is the first real change for the
419                                 # next split one.
420                                 $hunk_start = $next_hunk_start;
421                                 $o_ofs = $this->{OLD} + $this->{OCNT};
422                                 $n_ofs = $this->{NEW} + $this->{NCNT};
423                                 $o_ofs -= $this->{POSTCTX};
424                                 $n_ofs -= $this->{POSTCTX};
425                                 push @split, $this;
426                                 redo OUTER;
427                         }
428                         push @{$this->{TEXT}}, $line;
429                         $this->{ADDDEL}++;
430                         if ($line =~ /^-/) {
431                                 $this->{OCNT}++;
432                         }
433                         else {
434                                 $this->{NCNT}++;
435                         }
436                 }
437
438                 push @split, $this;
439                 last;
440         }
441
442         for my $hunk (@split) {
443                 $o_ofs = $hunk->{OLD};
444                 $n_ofs = $hunk->{NEW};
445                 my $o_cnt = $hunk->{OCNT};
446                 my $n_cnt = $hunk->{NCNT};
447
448                 my $head = ("@@ -$o_ofs" .
449                             (($o_cnt != 1) ? ",$o_cnt" : '') .
450                             " +$n_ofs" .
451                             (($n_cnt != 1) ? ",$n_cnt" : '') .
452                             " @@\n");
453                 unshift @{$hunk->{TEXT}}, $head;
454         }
455         return map { $_->{TEXT} } @split;
456 }
457
458 sub find_last_o_ctx {
459         my ($it) = @_;
460         my $text = $it->{TEXT};
461         my ($o_ofs, $o_cnt) = parse_hunk_header($text->[0]);
462         my $i = @{$text};
463         my $last_o_ctx = $o_ofs + $o_cnt;
464         while (0 < --$i) {
465                 my $line = $text->[$i];
466                 if ($line =~ /^ /) {
467                         $last_o_ctx--;
468                         next;
469                 }
470                 last;
471         }
472         return $last_o_ctx;
473 }
474
475 sub merge_hunk {
476         my ($prev, $this) = @_;
477         my ($o0_ofs, $o0_cnt, $n0_ofs, $n0_cnt) =
478             parse_hunk_header($prev->{TEXT}[0]);
479         my ($o1_ofs, $o1_cnt, $n1_ofs, $n1_cnt) =
480             parse_hunk_header($this->{TEXT}[0]);
481
482         my (@line, $i, $ofs, $o_cnt, $n_cnt);
483         $ofs = $o0_ofs;
484         $o_cnt = $n_cnt = 0;
485         for ($i = 1; $i < @{$prev->{TEXT}}; $i++) {
486                 my $line = $prev->{TEXT}[$i];
487                 if ($line =~ /^\+/) {
488                         $n_cnt++;
489                         push @line, $line;
490                         next;
491                 }
492
493                 last if ($o1_ofs <= $ofs);
494
495                 $o_cnt++;
496                 $ofs++;
497                 if ($line =~ /^ /) {
498                         $n_cnt++;
499                 }
500                 push @line, $line;
501         }
502
503         for ($i = 1; $i < @{$this->{TEXT}}; $i++) {
504                 my $line = $this->{TEXT}[$i];
505                 if ($line =~ /^\+/) {
506                         $n_cnt++;
507                         push @line, $line;
508                         next;
509                 }
510                 $ofs++;
511                 $o_cnt++;
512                 if ($line =~ /^ /) {
513                         $n_cnt++;
514                 }
515                 push @line, $line;
516         }
517         my $head = ("@@ -$o0_ofs" .
518                     (($o_cnt != 1) ? ",$o_cnt" : '') .
519                     " +$n0_ofs" .
520                     (($n_cnt != 1) ? ",$n_cnt" : '') .
521                     " @@\n");
522         @{$prev->{TEXT}} = ($head, @line);
523 }
524
525 sub coalesce_overlapping_hunks {
526         my (@in) = @_;
527         my @out = ();
528
529         my ($last_o_ctx);
530
531         for (grep { $_->{USE} } @in) {
532                 my $text = $_->{TEXT};
533                 my ($o_ofs) = parse_hunk_header($text->[0]);
534                 if (defined $last_o_ctx &&
535                     $o_ofs <= $last_o_ctx) {
536                         merge_hunk($out[-1], $_);
537                 }
538                 else {
539                         push @out, $_;
540                 }
541                 $last_o_ctx = find_last_o_ctx($out[-1]);
542         }
543         return @out;
544 }
545
546 sub help_patch_cmd {
547         print <<\EOF ;
548 y - stage this hunk
549 n - do not stage this hunk
550 a - stage this and all the remaining hunks
551 d - do not stage this hunk nor any of the remaining hunks
552 j - leave this hunk undecided, see next undecided hunk
553 J - leave this hunk undecided, see next hunk
554 k - leave this hunk undecided, see previous undecided hunk
555 K - leave this hunk undecided, see previous hunk
556 s - split the current hunk into smaller hunks
557 EOF
558 }
559
560 sub patch_update_cmd {
561         my @mods = list_modified('file-only');
562         @mods = grep { !($_->{BINARY}) } @mods;
563         return if (!@mods);
564
565         my ($it) = list_and_choose({ PROMPT => 'Patch update',
566                                      SINGLETON => 1,
567                                      IMMEDIATE => 1,
568                                      HEADER => $status_head, },
569                                    @mods);
570         return if (!$it);
571
572         my ($ix, $num);
573         my $path = $it->{VALUE};
574         my ($head, @hunk) = parse_diff($path);
575         for (@{$head->{TEXT}}) {
576                 print;
577         }
578         $num = scalar @hunk;
579         $ix = 0;
580
581         while (1) {
582                 my ($prev, $next, $other, $undecided, $i);
583                 $other = '';
584
585                 if ($num <= $ix) {
586                         $ix = 0;
587                 }
588                 for ($i = 0; $i < $ix; $i++) {
589                         if (!defined $hunk[$i]{USE}) {
590                                 $prev = 1;
591                                 $other .= '/k';
592                                 last;
593                         }
594                 }
595                 if ($ix) {
596                         $other .= '/K';
597                 }
598                 for ($i = $ix + 1; $i < $num; $i++) {
599                         if (!defined $hunk[$i]{USE}) {
600                                 $next = 1;
601                                 $other .= '/j';
602                                 last;
603                         }
604                 }
605                 if ($ix < $num - 1) {
606                         $other .= '/J';
607                 }
608                 for ($i = 0; $i < $num; $i++) {
609                         if (!defined $hunk[$i]{USE}) {
610                                 $undecided = 1;
611                                 last;
612                         }
613                 }
614                 last if (!$undecided);
615
616                 if (hunk_splittable($hunk[$ix]{TEXT})) {
617                         $other .= '/s';
618                 }
619                 for (@{$hunk[$ix]{TEXT}}) {
620                         print;
621                 }
622                 print "Stage this hunk [y/n/a/d$other/?]? ";
623                 my $line = <STDIN>;
624                 if ($line) {
625                         if ($line =~ /^y/i) {
626                                 $hunk[$ix]{USE} = 1;
627                         }
628                         elsif ($line =~ /^n/i) {
629                                 $hunk[$ix]{USE} = 0;
630                         }
631                         elsif ($line =~ /^a/i) {
632                                 while ($ix < $num) {
633                                         if (!defined $hunk[$ix]{USE}) {
634                                                 $hunk[$ix]{USE} = 1;
635                                         }
636                                         $ix++;
637                                 }
638                                 next;
639                         }
640                         elsif ($line =~ /^d/i) {
641                                 while ($ix < $num) {
642                                         if (!defined $hunk[$ix]{USE}) {
643                                                 $hunk[$ix]{USE} = 0;
644                                         }
645                                         $ix++;
646                                 }
647                                 next;
648                         }
649                         elsif ($other =~ /K/ && $line =~ /^K/) {
650                                 $ix--;
651                                 next;
652                         }
653                         elsif ($other =~ /J/ && $line =~ /^J/) {
654                                 $ix++;
655                                 next;
656                         }
657                         elsif ($other =~ /k/ && $line =~ /^k/) {
658                                 while (1) {
659                                         $ix--;
660                                         last if (!$ix ||
661                                                  !defined $hunk[$ix]{USE});
662                                 }
663                                 next;
664                         }
665                         elsif ($other =~ /j/ && $line =~ /^j/) {
666                                 while (1) {
667                                         $ix++;
668                                         last if ($ix >= $num ||
669                                                  !defined $hunk[$ix]{USE});
670                                 }
671                                 next;
672                         }
673                         elsif ($other =~ /s/ && $line =~ /^s/) {
674                                 my @split = split_hunk($hunk[$ix]{TEXT});
675                                 if (1 < @split) {
676                                         print "Split into ",
677                                         scalar(@split), " hunks.\n";
678                                 }
679                                 splice(@hunk, $ix, 1,
680                                        map { +{ TEXT => $_, USE => undef } }
681                                        @split);
682                                 $num = scalar @hunk;
683                                 next;
684                         }
685                         else {
686                                 help_patch_cmd($other);
687                                 next;
688                         }
689                         # soft increment
690                         while (1) {
691                                 $ix++;
692                                 last if ($ix >= $num ||
693                                          !defined $hunk[$ix]{USE});
694                         }
695                 }
696         }
697
698         @hunk = coalesce_overlapping_hunks(@hunk);
699
700         my $n_lofs = 0;
701         my @result = ();
702         for (@hunk) {
703                 my $text = $_->{TEXT};
704                 my ($o_ofs, $o_cnt, $n_ofs, $n_cnt) =
705                     parse_hunk_header($text->[0]);
706
707                 if (!$_->{USE}) {
708                         # We would have added ($n_cnt - $o_cnt) lines
709                         # to the postimage if we were to use this hunk,
710                         # but we didn't.  So the line number that the next
711                         # hunk starts at would be shifted by that much.
712                         $n_lofs -= ($n_cnt - $o_cnt);
713                         next;
714                 }
715                 else {
716                         if ($n_lofs) {
717                                 $n_ofs += $n_lofs;
718                                 $text->[0] = ("@@ -$o_ofs" .
719                                               (($o_cnt != 1)
720                                                ? ",$o_cnt" : '') .
721                                               " +$n_ofs" .
722                                               (($n_cnt != 1)
723                                                ? ",$n_cnt" : '') .
724                                               " @@\n");
725                         }
726                         for (@$text) {
727                                 push @result, $_;
728                         }
729                 }
730         }
731
732         if (@result) {
733                 my $fh;
734
735                 open $fh, '| git apply --cached';
736                 for (@{$head->{TEXT}}, @result) {
737                         print $fh $_;
738                 }
739                 if (!close $fh) {
740                         for (@{$head->{TEXT}}, @result) {
741                                 print STDERR $_;
742                         }
743                 }
744                 refresh();
745         }
746
747         print "\n";
748 }
749
750 sub diff_cmd {
751         my @mods = list_modified('index-only');
752         @mods = grep { !($_->{BINARY}) } @mods;
753         return if (!@mods);
754         my (@them) = list_and_choose({ PROMPT => 'Review diff',
755                                      IMMEDIATE => 1,
756                                      HEADER => $status_head, },
757                                    @mods);
758         return if (!@them);
759         system(qw(git diff-index -p --cached HEAD --),
760                map { $_->{VALUE} } @them);
761 }
762
763 sub quit_cmd {
764         print "Bye.\n";
765         exit(0);
766 }
767
768 sub help_cmd {
769         print <<\EOF ;
770 status        - show paths with changes
771 update        - add working tree state to the staged set of changes
772 revert        - revert staged set of changes back to the HEAD version
773 patch         - pick hunks and update selectively
774 diff          - view diff between HEAD and index
775 add untracked - add contents of untracked files to the staged set of changes
776 EOF
777 }
778
779 sub main_loop {
780         my @cmd = ([ 'status', \&status_cmd, ],
781                    [ 'update', \&update_cmd, ],
782                    [ 'revert', \&revert_cmd, ],
783                    [ 'add untracked', \&add_untracked_cmd, ],
784                    [ 'patch', \&patch_update_cmd, ],
785                    [ 'diff', \&diff_cmd, ],
786                    [ 'quit', \&quit_cmd, ],
787                    [ 'help', \&help_cmd, ],
788         );
789         while (1) {
790                 my ($it) = list_and_choose({ PROMPT => 'What now',
791                                              SINGLETON => 1,
792                                              LIST_FLAT => 4,
793                                              HEADER => '*** Commands ***',
794                                              ON_EOF => \&quit_cmd,
795                                              IMMEDIATE => 1 }, @cmd);
796                 if ($it) {
797                         eval {
798                                 $it->[1]->();
799                         };
800                         if ($@) {
801                                 print "$@";
802                         }
803                 }
804         }
805 }
806
807 refresh();
808 status_cmd();
809 main_loop();