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7e0abcec | 1 | #!/usr/bin/perl |
f47f1e2c | 2 | # Copyright (c) 2009, 2010 David Aguilar |
7e0abcec | 3 | # Copyright (c) 2012 Tim Henigan |
5c38ea31 DA |
4 | # |
5 | # This is a wrapper around the GIT_EXTERNAL_DIFF-compatible | |
a904392e DA |
6 | # git-difftool--helper script. |
7 | # | |
8 | # This script exports GIT_EXTERNAL_DIFF and GIT_PAGER for use by git. | |
7e0abcec | 9 | # The GIT_DIFF* variables are exported for use by git-difftool--helper. |
a904392e | 10 | # |
5c38ea31 DA |
11 | # Any arguments that are unknown to this script are forwarded to 'git diff'. |
12 | ||
d48b2841 | 13 | use 5.008; |
5c38ea31 DA |
14 | use strict; |
15 | use warnings; | |
67aa147a | 16 | use Error qw(:try); |
7c7584b9 | 17 | use File::Basename qw(dirname); |
7e0abcec | 18 | use File::Copy; |
7c7584b9 | 19 | use File::Find; |
7e0abcec | 20 | use File::stat; |
ceb1497a | 21 | use File::Path qw(mkpath rmtree); |
7e0abcec | 22 | use File::Temp qw(tempdir); |
3f94ff75 TH |
23 | use Getopt::Long qw(:config pass_through); |
24 | use Git; | |
5c38ea31 DA |
25 | |
26 | sub usage | |
27 | { | |
28360769 | 28 | my $exitcode = shift; |
5c38ea31 | 29 | print << 'USAGE'; |
bf73fc21 | 30 | usage: git difftool [-t|--tool=<tool>] [--tool-help] |
85089604 TH |
31 | [-x|--extcmd=<cmd>] |
32 | [-g|--gui] [--no-gui] | |
3f94ff75 | 33 | [--prompt] [-y|--no-prompt] |
7e0abcec | 34 | [-d|--dir-diff] |
f47f1e2c | 35 | ['git diff' options] |
5c38ea31 | 36 | USAGE |
28360769 | 37 | exit($exitcode); |
5c38ea31 DA |
38 | } |
39 | ||
7e0abcec TH |
40 | sub find_worktree |
41 | { | |
42 | # Git->repository->wc_path() does not honor changes to the working | |
43 | # tree location made by $ENV{GIT_WORK_TREE} or the 'core.worktree' | |
44 | # config variable. | |
94eaa806 | 45 | return Git::command_oneline('rev-parse', '--show-toplevel'); |
7e0abcec TH |
46 | } |
47 | ||
bf73fc21 TH |
48 | sub print_tool_help |
49 | { | |
abaf175c JK |
50 | # See the comment at the bottom of file_diff() for the reason behind |
51 | # using system() followed by exit() instead of exec(). | |
4fb4b02d | 52 | my $rc = system(qw(git mergetool --tool-help=diff)); |
abaf175c | 53 | exit($rc | ($rc >> 8)); |
bf73fc21 TH |
54 | } |
55 | ||
ceb1497a DA |
56 | sub exit_cleanup |
57 | { | |
58 | my ($tmpdir, $status) = @_; | |
59 | my $errno = $!; | |
60 | rmtree($tmpdir); | |
61 | if ($status and $errno) { | |
62 | my ($package, $file, $line) = caller(); | |
63 | warn "$file line $line: $errno\n"; | |
64 | } | |
65 | exit($status | ($status >> 8)); | |
66 | } | |
67 | ||
02c56314 JK |
68 | sub use_wt_file |
69 | { | |
32eaf1de | 70 | my ($repo, $workdir, $file, $sha1) = @_; |
02c56314 JK |
71 | my $null_sha1 = '0' x 40; |
72 | ||
cfe2d4be | 73 | if (-l "$workdir/$file" || ! -e _) { |
1f197a1d JK |
74 | return (0, $null_sha1); |
75 | } | |
76 | ||
02c56314 | 77 | my $wt_sha1 = $repo->command_oneline('hash-object', "$workdir/$file"); |
67aa147a JK |
78 | my $use = ($sha1 eq $null_sha1) || ($sha1 eq $wt_sha1); |
79 | return ($use, $wt_sha1); | |
80 | } | |
81 | ||
82 | sub changed_files | |
83 | { | |
84 | my ($repo_path, $index, $worktree) = @_; | |
85 | $ENV{GIT_INDEX_FILE} = $index; | |
86 | $ENV{GIT_WORK_TREE} = $worktree; | |
87 | my $must_unset_git_dir = 0; | |
88 | if (not defined($ENV{GIT_DIR})) { | |
89 | $must_unset_git_dir = 1; | |
90 | $ENV{GIT_DIR} = $repo_path; | |
91 | } | |
92 | ||
93 | my @refreshargs = qw/update-index --really-refresh -q --unmerged/; | |
94 | my @gitargs = qw/diff-files --name-only -z/; | |
95 | try { | |
96 | Git::command_oneline(@refreshargs); | |
97 | } catch Git::Error::Command with {}; | |
98 | ||
99 | my $line = Git::command_oneline(@gitargs); | |
100 | my @files; | |
101 | if (defined $line) { | |
102 | @files = split('\0', $line); | |
103 | } else { | |
104 | @files = (); | |
105 | } | |
106 | ||
107 | delete($ENV{GIT_INDEX_FILE}); | |
108 | delete($ENV{GIT_WORK_TREE}); | |
109 | delete($ENV{GIT_DIR}) if ($must_unset_git_dir); | |
110 | ||
111 | return map { $_ => 1 } @files; | |
02c56314 JK |
112 | } |
113 | ||
7e0abcec TH |
114 | sub setup_dir_diff |
115 | { | |
1f229345 | 116 | my ($repo, $workdir, $symlinks) = @_; |
75cd7583 | 117 | |
7e0abcec TH |
118 | # Run the diff; exit immediately if no diff found |
119 | # 'Repository' and 'WorkingCopy' must be explicitly set to insure that | |
120 | # if $GIT_DIR and $GIT_WORK_TREE are set in ENV, they are actually used | |
121 | # by Git->repository->command*. | |
75cd7583 | 122 | my $repo_path = $repo->repo_path(); |
a4cd5be3 DA |
123 | my %repo_args = (Repository => $repo_path, WorkingCopy => $workdir); |
124 | my $diffrepo = Git->repository(%repo_args); | |
125 | ||
126 | my @gitargs = ('diff', '--raw', '--no-abbrev', '-z', @ARGV); | |
127 | my $diffrtn = $diffrepo->command_oneline(@gitargs); | |
ed36e5bd | 128 | exit(0) unless defined($diffrtn); |
7e0abcec | 129 | |
7e0abcec TH |
130 | # Build index info for left and right sides of the diff |
131 | my $submodule_mode = '160000'; | |
132 | my $symlink_mode = '120000'; | |
133 | my $null_mode = '0' x 6; | |
134 | my $null_sha1 = '0' x 40; | |
135 | my $lindex = ''; | |
136 | my $rindex = ''; | |
67aa147a | 137 | my $wtindex = ''; |
7e0abcec TH |
138 | my %submodule; |
139 | my %symlink; | |
75cd7583 | 140 | my @working_tree = (); |
7e0abcec TH |
141 | my @rawdiff = split('\0', $diffrtn); |
142 | ||
143 | my $i = 0; | |
144 | while ($i < $#rawdiff) { | |
145 | if ($rawdiff[$i] =~ /^::/) { | |
a4cd5be3 DA |
146 | warn << 'EOF'; |
147 | Combined diff formats ('-c' and '--cc') are not supported in | |
148 | directory diff mode ('-d' and '--dir-diff'). | |
149 | EOF | |
7e0abcec TH |
150 | exit(1); |
151 | } | |
152 | ||
a4cd5be3 DA |
153 | my ($lmode, $rmode, $lsha1, $rsha1, $status) = |
154 | split(' ', substr($rawdiff[$i], 1)); | |
7e0abcec TH |
155 | my $src_path = $rawdiff[$i + 1]; |
156 | my $dst_path; | |
157 | ||
158 | if ($status =~ /^[CR]/) { | |
159 | $dst_path = $rawdiff[$i + 2]; | |
160 | $i += 3; | |
161 | } else { | |
162 | $dst_path = $src_path; | |
163 | $i += 2; | |
164 | } | |
165 | ||
a4cd5be3 | 166 | if ($lmode eq $submodule_mode or $rmode eq $submodule_mode) { |
7e0abcec TH |
167 | $submodule{$src_path}{left} = $lsha1; |
168 | if ($lsha1 ne $rsha1) { | |
169 | $submodule{$dst_path}{right} = $rsha1; | |
170 | } else { | |
171 | $submodule{$dst_path}{right} = "$rsha1-dirty"; | |
172 | } | |
173 | next; | |
174 | } | |
175 | ||
176 | if ($lmode eq $symlink_mode) { | |
a4cd5be3 DA |
177 | $symlink{$src_path}{left} = |
178 | $diffrepo->command_oneline('show', "$lsha1"); | |
7e0abcec TH |
179 | } |
180 | ||
181 | if ($rmode eq $symlink_mode) { | |
a4cd5be3 DA |
182 | $symlink{$dst_path}{right} = |
183 | $diffrepo->command_oneline('show', "$rsha1"); | |
7e0abcec TH |
184 | } |
185 | ||
a4cd5be3 | 186 | if ($lmode ne $null_mode and $status !~ /^C/) { |
7e0abcec TH |
187 | $lindex .= "$lmode $lsha1\t$src_path\0"; |
188 | } | |
189 | ||
190 | if ($rmode ne $null_mode) { | |
67aa147a | 191 | my ($use, $wt_sha1) = use_wt_file($repo, $workdir, |
32eaf1de | 192 | $dst_path, $rsha1); |
67aa147a JK |
193 | if ($use) { |
194 | push @working_tree, $dst_path; | |
195 | $wtindex .= "$rmode $wt_sha1\t$dst_path\0"; | |
02c56314 JK |
196 | } else { |
197 | $rindex .= "$rmode $rsha1\t$dst_path\0"; | |
7e0abcec TH |
198 | } |
199 | } | |
200 | } | |
201 | ||
ceb1497a DA |
202 | # Setup temp directories |
203 | my $tmpdir = tempdir('git-difftool.XXXXX', CLEANUP => 0, TMPDIR => 1); | |
204 | my $ldir = "$tmpdir/left"; | |
205 | my $rdir = "$tmpdir/right"; | |
206 | mkpath($ldir) or exit_cleanup($tmpdir, 1); | |
207 | mkpath($rdir) or exit_cleanup($tmpdir, 1); | |
208 | ||
7e0abcec TH |
209 | # If $GIT_DIR is not set prior to calling 'git update-index' and |
210 | # 'git checkout-index', then those commands will fail if difftool | |
211 | # is called from a directory other than the repo root. | |
212 | my $must_unset_git_dir = 0; | |
213 | if (not defined($ENV{GIT_DIR})) { | |
214 | $must_unset_git_dir = 1; | |
215 | $ENV{GIT_DIR} = $repo_path; | |
216 | } | |
217 | ||
218 | # Populate the left and right directories based on each index file | |
219 | my ($inpipe, $ctx); | |
220 | $ENV{GIT_INDEX_FILE} = "$tmpdir/lindex"; | |
a4cd5be3 DA |
221 | ($inpipe, $ctx) = |
222 | $repo->command_input_pipe(qw(update-index -z --index-info)); | |
7e0abcec TH |
223 | print($inpipe $lindex); |
224 | $repo->command_close_pipe($inpipe, $ctx); | |
ceb1497a | 225 | |
75cd7583 | 226 | my $rc = system('git', 'checkout-index', '--all', "--prefix=$ldir/"); |
ceb1497a | 227 | exit_cleanup($tmpdir, $rc) if $rc != 0; |
7e0abcec TH |
228 | |
229 | $ENV{GIT_INDEX_FILE} = "$tmpdir/rindex"; | |
a4cd5be3 DA |
230 | ($inpipe, $ctx) = |
231 | $repo->command_input_pipe(qw(update-index -z --index-info)); | |
7e0abcec TH |
232 | print($inpipe $rindex); |
233 | $repo->command_close_pipe($inpipe, $ctx); | |
ceb1497a | 234 | |
7e0abcec | 235 | $rc = system('git', 'checkout-index', '--all', "--prefix=$rdir/"); |
ceb1497a | 236 | exit_cleanup($tmpdir, $rc) if $rc != 0; |
7e0abcec | 237 | |
67aa147a JK |
238 | $ENV{GIT_INDEX_FILE} = "$tmpdir/wtindex"; |
239 | ($inpipe, $ctx) = | |
240 | $repo->command_input_pipe(qw(update-index --info-only -z --index-info)); | |
241 | print($inpipe $wtindex); | |
242 | $repo->command_close_pipe($inpipe, $ctx); | |
243 | ||
7e0abcec TH |
244 | # If $GIT_DIR was explicitly set just for the update/checkout |
245 | # commands, then it should be unset before continuing. | |
246 | delete($ENV{GIT_DIR}) if ($must_unset_git_dir); | |
247 | delete($ENV{GIT_INDEX_FILE}); | |
248 | ||
249 | # Changes in the working tree need special treatment since they are | |
e0976dcf JK |
250 | # not part of the index. Remove any trailing slash from $workdir |
251 | # before starting to avoid double slashes in symlink targets. | |
252 | $workdir =~ s|/$||; | |
7e0abcec TH |
253 | for my $file (@working_tree) { |
254 | my $dir = dirname($file); | |
255 | unless (-d "$rdir/$dir") { | |
ceb1497a DA |
256 | mkpath("$rdir/$dir") or |
257 | exit_cleanup($tmpdir, 1); | |
7e0abcec | 258 | } |
1f229345 | 259 | if ($symlinks) { |
ceb1497a DA |
260 | symlink("$workdir/$file", "$rdir/$file") or |
261 | exit_cleanup($tmpdir, 1); | |
1f229345 | 262 | } else { |
ceb1497a DA |
263 | copy("$workdir/$file", "$rdir/$file") or |
264 | exit_cleanup($tmpdir, 1); | |
265 | ||
1f229345 | 266 | my $mode = stat("$workdir/$file")->mode; |
ceb1497a DA |
267 | chmod($mode, "$rdir/$file") or |
268 | exit_cleanup($tmpdir, 1); | |
1f229345 | 269 | } |
7e0abcec TH |
270 | } |
271 | ||
272 | # Changes to submodules require special treatment. This loop writes a | |
273 | # temporary file to both the left and right directories to show the | |
274 | # change in the recorded SHA1 for the submodule. | |
275 | for my $path (keys %submodule) { | |
ceb1497a | 276 | my $ok; |
7e0abcec | 277 | if (defined($submodule{$path}{left})) { |
ceb1497a DA |
278 | $ok = write_to_file("$ldir/$path", |
279 | "Subproject commit $submodule{$path}{left}"); | |
7e0abcec TH |
280 | } |
281 | if (defined($submodule{$path}{right})) { | |
ceb1497a DA |
282 | $ok = write_to_file("$rdir/$path", |
283 | "Subproject commit $submodule{$path}{right}"); | |
7e0abcec | 284 | } |
ceb1497a | 285 | exit_cleanup($tmpdir, 1) if not $ok; |
7e0abcec TH |
286 | } |
287 | ||
288 | # Symbolic links require special treatment. The standard "git diff" | |
289 | # shows only the link itself, not the contents of the link target. | |
290 | # This loop replicates that behavior. | |
291 | for my $path (keys %symlink) { | |
ceb1497a | 292 | my $ok; |
7e0abcec | 293 | if (defined($symlink{$path}{left})) { |
ceb1497a DA |
294 | $ok = write_to_file("$ldir/$path", |
295 | $symlink{$path}{left}); | |
7e0abcec TH |
296 | } |
297 | if (defined($symlink{$path}{right})) { | |
ceb1497a DA |
298 | $ok = write_to_file("$rdir/$path", |
299 | $symlink{$path}{right}); | |
7e0abcec | 300 | } |
ceb1497a | 301 | exit_cleanup($tmpdir, 1) if not $ok; |
7e0abcec TH |
302 | } |
303 | ||
ceb1497a | 304 | return ($ldir, $rdir, $tmpdir, @working_tree); |
7e0abcec TH |
305 | } |
306 | ||
307 | sub write_to_file | |
308 | { | |
309 | my $path = shift; | |
310 | my $value = shift; | |
311 | ||
312 | # Make sure the path to the file exists | |
313 | my $dir = dirname($path); | |
314 | unless (-d "$dir") { | |
ceb1497a | 315 | mkpath("$dir") or return 0; |
7e0abcec TH |
316 | } |
317 | ||
318 | # If the file already exists in that location, delete it. This | |
319 | # is required in the case of symbolic links. | |
ceb1497a | 320 | unlink($path); |
7e0abcec | 321 | |
ceb1497a | 322 | open(my $fh, '>', $path) or return 0; |
7e0abcec TH |
323 | print($fh $value); |
324 | close($fh); | |
ceb1497a DA |
325 | |
326 | return 1; | |
7e0abcec TH |
327 | } |
328 | ||
75cd7583 DA |
329 | sub main |
330 | { | |
331 | # parse command-line options. all unrecognized options and arguments | |
332 | # are passed through to the 'git diff' command. | |
c9bdd505 DA |
333 | my %opts = ( |
334 | difftool_cmd => undef, | |
335 | dirdiff => undef, | |
336 | extcmd => undef, | |
337 | gui => undef, | |
338 | help => undef, | |
339 | prompt => undef, | |
190f5475 DA |
340 | symlinks => $^O ne 'cygwin' && |
341 | $^O ne 'MSWin32' && $^O ne 'msys', | |
c9bdd505 | 342 | tool_help => undef, |
2b52123f | 343 | trust_exit_code => undef, |
c9bdd505 DA |
344 | ); |
345 | GetOptions('g|gui!' => \$opts{gui}, | |
346 | 'd|dir-diff' => \$opts{dirdiff}, | |
347 | 'h' => \$opts{help}, | |
348 | 'prompt!' => \$opts{prompt}, | |
349 | 'y' => sub { $opts{prompt} = 0; }, | |
1f229345 DA |
350 | 'symlinks' => \$opts{symlinks}, |
351 | 'no-symlinks' => sub { $opts{symlinks} = 0; }, | |
c9bdd505 DA |
352 | 't|tool:s' => \$opts{difftool_cmd}, |
353 | 'tool-help' => \$opts{tool_help}, | |
2b52123f DA |
354 | 'trust-exit-code' => \$opts{trust_exit_code}, |
355 | 'no-trust-exit-code' => sub { $opts{trust_exit_code} = 0; }, | |
c9bdd505 DA |
356 | 'x|extcmd:s' => \$opts{extcmd}); |
357 | ||
358 | if (defined($opts{help})) { | |
75cd7583 | 359 | usage(0); |
5c38ea31 | 360 | } |
c9bdd505 | 361 | if (defined($opts{tool_help})) { |
75cd7583 | 362 | print_tool_help(); |
3f94ff75 | 363 | } |
c9bdd505 DA |
364 | if (defined($opts{difftool_cmd})) { |
365 | if (length($opts{difftool_cmd}) > 0) { | |
366 | $ENV{GIT_DIFF_TOOL} = $opts{difftool_cmd}; | |
75cd7583 DA |
367 | } else { |
368 | print "No <tool> given for --tool=<tool>\n"; | |
369 | usage(1); | |
370 | } | |
371 | } | |
c9bdd505 DA |
372 | if (defined($opts{extcmd})) { |
373 | if (length($opts{extcmd}) > 0) { | |
374 | $ENV{GIT_DIFFTOOL_EXTCMD} = $opts{extcmd}; | |
75cd7583 DA |
375 | } else { |
376 | print "No <cmd> given for --extcmd=<cmd>\n"; | |
377 | usage(1); | |
378 | } | |
379 | } | |
c9bdd505 DA |
380 | if ($opts{gui}) { |
381 | my $guitool = Git::config('diff.guitool'); | |
af14b5cf | 382 | if (defined($guitool) && length($guitool) > 0) { |
75cd7583 DA |
383 | $ENV{GIT_DIFF_TOOL} = $guitool; |
384 | } | |
385 | } | |
386 | ||
2b52123f DA |
387 | if (!defined $opts{trust_exit_code}) { |
388 | $opts{trust_exit_code} = Git::config_bool('difftool.trustExitCode'); | |
389 | } | |
390 | if ($opts{trust_exit_code}) { | |
391 | $ENV{GIT_DIFFTOOL_TRUST_EXIT_CODE} = 'true'; | |
392 | } else { | |
393 | $ENV{GIT_DIFFTOOL_TRUST_EXIT_CODE} = 'false'; | |
394 | } | |
395 | ||
75cd7583 DA |
396 | # In directory diff mode, 'git-difftool--helper' is called once |
397 | # to compare the a/b directories. In file diff mode, 'git diff' | |
398 | # will invoke a separate instance of 'git-difftool--helper' for | |
399 | # each file that changed. | |
c9bdd505 | 400 | if (defined($opts{dirdiff})) { |
1f229345 | 401 | dir_diff($opts{extcmd}, $opts{symlinks}); |
75cd7583 | 402 | } else { |
c9bdd505 | 403 | file_diff($opts{prompt}); |
3f94ff75 TH |
404 | } |
405 | } | |
7e0abcec | 406 | |
75cd7583 DA |
407 | sub dir_diff |
408 | { | |
1f229345 | 409 | my ($extcmd, $symlinks) = @_; |
75cd7583 | 410 | my $rc; |
ceb1497a | 411 | my $error = 0; |
75cd7583 | 412 | my $repo = Git->repository(); |
94eaa806 | 413 | my $workdir = find_worktree(); |
ceb1497a DA |
414 | my ($a, $b, $tmpdir, @worktree) = |
415 | setup_dir_diff($repo, $workdir, $symlinks); | |
416 | ||
7e0abcec TH |
417 | if (defined($extcmd)) { |
418 | $rc = system($extcmd, $a, $b); | |
3f94ff75 | 419 | } else { |
7e0abcec TH |
420 | $ENV{GIT_DIFFTOOL_DIRDIFF} = 'true'; |
421 | $rc = system('git', 'difftool--helper', $a, $b); | |
d531174f | 422 | } |
7e0abcec TH |
423 | # If the diff including working copy files and those |
424 | # files were modified during the diff, then the changes | |
1f229345 DA |
425 | # should be copied back to the working tree. |
426 | # Do not copy back files when symlinks are used and the | |
427 | # external tool did not replace the original link with a file. | |
67aa147a JK |
428 | # |
429 | # These hashes are loaded lazily since they aren't needed | |
430 | # in the common case of --symlinks and the difftool updating | |
431 | # files through the symlink. | |
432 | my %wt_modified; | |
433 | my %tmp_modified; | |
434 | my $indices_loaded = 0; | |
435 | ||
1f229345 DA |
436 | for my $file (@worktree) { |
437 | next if $symlinks && -l "$b/$file"; | |
283abb2c DA |
438 | next if ! -f "$b/$file"; |
439 | ||
67aa147a JK |
440 | if (!$indices_loaded) { |
441 | %wt_modified = changed_files($repo->repo_path(), | |
442 | "$tmpdir/wtindex", "$workdir"); | |
443 | %tmp_modified = changed_files($repo->repo_path(), | |
444 | "$tmpdir/wtindex", "$b"); | |
445 | $indices_loaded = 1; | |
446 | } | |
447 | ||
448 | if (exists $wt_modified{$file} and exists $tmp_modified{$file}) { | |
449 | my $errmsg = "warning: Both files modified: "; | |
450 | $errmsg .= "'$workdir/$file' and '$b/$file'.\n"; | |
451 | $errmsg .= "warning: Working tree file has been left.\n"; | |
452 | $errmsg .= "warning:\n"; | |
283abb2c | 453 | warn $errmsg; |
ceb1497a | 454 | $error = 1; |
67aa147a | 455 | } elsif (exists $tmp_modified{$file}) { |
1f229345 | 456 | my $mode = stat("$b/$file")->mode; |
ceb1497a DA |
457 | copy("$b/$file", "$workdir/$file") or |
458 | exit_cleanup($tmpdir, 1); | |
459 | ||
460 | chmod($mode, "$workdir/$file") or | |
461 | exit_cleanup($tmpdir, 1); | |
05df5326 | 462 | } |
7e0abcec | 463 | } |
ceb1497a DA |
464 | if ($error) { |
465 | warn "warning: Temporary files exist in '$tmpdir'.\n"; | |
466 | warn "warning: You may want to cleanup or recover these.\n"; | |
467 | exit(1); | |
468 | } else { | |
469 | exit_cleanup($tmpdir, $rc); | |
470 | } | |
75cd7583 DA |
471 | } |
472 | ||
473 | sub file_diff | |
474 | { | |
475 | my ($prompt) = @_; | |
476 | ||
7e0abcec TH |
477 | if (defined($prompt)) { |
478 | if ($prompt) { | |
479 | $ENV{GIT_DIFFTOOL_PROMPT} = 'true'; | |
480 | } else { | |
481 | $ENV{GIT_DIFFTOOL_NO_PROMPT} = 'true'; | |
482 | } | |
483 | } | |
484 | ||
485 | $ENV{GIT_PAGER} = ''; | |
486 | $ENV{GIT_EXTERNAL_DIFF} = 'git-difftool--helper'; | |
487 | ||
488 | # ActiveState Perl for Win32 does not implement POSIX semantics of | |
489 | # exec* system call. It just spawns the given executable and finishes | |
490 | # the starting program, exiting with code 0. | |
491 | # system will at least catch the errors returned by git diff, | |
492 | # allowing the caller of git difftool better handling of failures. | |
493 | my $rc = system('git', 'diff', @ARGV); | |
494 | exit($rc | ($rc >> 8)); | |
495 | } | |
75cd7583 DA |
496 | |
497 | main(); |