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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 | |
75cd7583 | 118 | my $repo_path = $repo->repo_path(); |
a4cd5be3 | 119 | my @gitargs = ('diff', '--raw', '--no-abbrev', '-z', @ARGV); |
9ec26e79 | 120 | my $diffrtn = $repo->command_oneline(@gitargs); |
ed36e5bd | 121 | exit(0) unless defined($diffrtn); |
7e0abcec | 122 | |
7e0abcec TH |
123 | # Build index info for left and right sides of the diff |
124 | my $submodule_mode = '160000'; | |
125 | my $symlink_mode = '120000'; | |
126 | my $null_mode = '0' x 6; | |
127 | my $null_sha1 = '0' x 40; | |
128 | my $lindex = ''; | |
129 | my $rindex = ''; | |
67aa147a | 130 | my $wtindex = ''; |
7e0abcec TH |
131 | my %submodule; |
132 | my %symlink; | |
75cd7583 | 133 | my @working_tree = (); |
366f9cea | 134 | my %working_tree_dups = (); |
7e0abcec TH |
135 | my @rawdiff = split('\0', $diffrtn); |
136 | ||
137 | my $i = 0; | |
138 | while ($i < $#rawdiff) { | |
139 | if ($rawdiff[$i] =~ /^::/) { | |
a4cd5be3 DA |
140 | warn << 'EOF'; |
141 | Combined diff formats ('-c' and '--cc') are not supported in | |
142 | directory diff mode ('-d' and '--dir-diff'). | |
143 | EOF | |
7e0abcec TH |
144 | exit(1); |
145 | } | |
146 | ||
a4cd5be3 DA |
147 | my ($lmode, $rmode, $lsha1, $rsha1, $status) = |
148 | split(' ', substr($rawdiff[$i], 1)); | |
7e0abcec TH |
149 | my $src_path = $rawdiff[$i + 1]; |
150 | my $dst_path; | |
151 | ||
152 | if ($status =~ /^[CR]/) { | |
153 | $dst_path = $rawdiff[$i + 2]; | |
154 | $i += 3; | |
155 | } else { | |
156 | $dst_path = $src_path; | |
157 | $i += 2; | |
158 | } | |
159 | ||
a4cd5be3 | 160 | if ($lmode eq $submodule_mode or $rmode eq $submodule_mode) { |
7e0abcec TH |
161 | $submodule{$src_path}{left} = $lsha1; |
162 | if ($lsha1 ne $rsha1) { | |
163 | $submodule{$dst_path}{right} = $rsha1; | |
164 | } else { | |
165 | $submodule{$dst_path}{right} = "$rsha1-dirty"; | |
166 | } | |
167 | next; | |
168 | } | |
169 | ||
170 | if ($lmode eq $symlink_mode) { | |
a4cd5be3 | 171 | $symlink{$src_path}{left} = |
9ec26e79 | 172 | $repo->command_oneline('show', "$lsha1"); |
7e0abcec TH |
173 | } |
174 | ||
175 | if ($rmode eq $symlink_mode) { | |
a4cd5be3 | 176 | $symlink{$dst_path}{right} = |
9ec26e79 | 177 | $repo->command_oneline('show', "$rsha1"); |
7e0abcec TH |
178 | } |
179 | ||
a4cd5be3 | 180 | if ($lmode ne $null_mode and $status !~ /^C/) { |
7e0abcec TH |
181 | $lindex .= "$lmode $lsha1\t$src_path\0"; |
182 | } | |
183 | ||
184 | if ($rmode ne $null_mode) { | |
366f9cea DA |
185 | # Avoid duplicate working_tree entries |
186 | if ($working_tree_dups{$dst_path}++) { | |
187 | next; | |
188 | } | |
67aa147a | 189 | my ($use, $wt_sha1) = use_wt_file($repo, $workdir, |
32eaf1de | 190 | $dst_path, $rsha1); |
67aa147a JK |
191 | if ($use) { |
192 | push @working_tree, $dst_path; | |
193 | $wtindex .= "$rmode $wt_sha1\t$dst_path\0"; | |
02c56314 JK |
194 | } else { |
195 | $rindex .= "$rmode $rsha1\t$dst_path\0"; | |
7e0abcec TH |
196 | } |
197 | } | |
198 | } | |
199 | ||
ceb1497a DA |
200 | # Setup temp directories |
201 | my $tmpdir = tempdir('git-difftool.XXXXX', CLEANUP => 0, TMPDIR => 1); | |
202 | my $ldir = "$tmpdir/left"; | |
203 | my $rdir = "$tmpdir/right"; | |
204 | mkpath($ldir) or exit_cleanup($tmpdir, 1); | |
205 | mkpath($rdir) or exit_cleanup($tmpdir, 1); | |
206 | ||
7e0abcec TH |
207 | # If $GIT_DIR is not set prior to calling 'git update-index' and |
208 | # 'git checkout-index', then those commands will fail if difftool | |
209 | # is called from a directory other than the repo root. | |
210 | my $must_unset_git_dir = 0; | |
211 | if (not defined($ENV{GIT_DIR})) { | |
212 | $must_unset_git_dir = 1; | |
213 | $ENV{GIT_DIR} = $repo_path; | |
214 | } | |
215 | ||
216 | # Populate the left and right directories based on each index file | |
217 | my ($inpipe, $ctx); | |
218 | $ENV{GIT_INDEX_FILE} = "$tmpdir/lindex"; | |
a4cd5be3 DA |
219 | ($inpipe, $ctx) = |
220 | $repo->command_input_pipe(qw(update-index -z --index-info)); | |
7e0abcec TH |
221 | print($inpipe $lindex); |
222 | $repo->command_close_pipe($inpipe, $ctx); | |
ceb1497a | 223 | |
75cd7583 | 224 | my $rc = system('git', 'checkout-index', '--all', "--prefix=$ldir/"); |
ceb1497a | 225 | exit_cleanup($tmpdir, $rc) if $rc != 0; |
7e0abcec TH |
226 | |
227 | $ENV{GIT_INDEX_FILE} = "$tmpdir/rindex"; | |
a4cd5be3 DA |
228 | ($inpipe, $ctx) = |
229 | $repo->command_input_pipe(qw(update-index -z --index-info)); | |
7e0abcec TH |
230 | print($inpipe $rindex); |
231 | $repo->command_close_pipe($inpipe, $ctx); | |
ceb1497a | 232 | |
7e0abcec | 233 | $rc = system('git', 'checkout-index', '--all', "--prefix=$rdir/"); |
ceb1497a | 234 | exit_cleanup($tmpdir, $rc) if $rc != 0; |
7e0abcec | 235 | |
67aa147a JK |
236 | $ENV{GIT_INDEX_FILE} = "$tmpdir/wtindex"; |
237 | ($inpipe, $ctx) = | |
238 | $repo->command_input_pipe(qw(update-index --info-only -z --index-info)); | |
239 | print($inpipe $wtindex); | |
240 | $repo->command_close_pipe($inpipe, $ctx); | |
241 | ||
7e0abcec TH |
242 | # If $GIT_DIR was explicitly set just for the update/checkout |
243 | # commands, then it should be unset before continuing. | |
244 | delete($ENV{GIT_DIR}) if ($must_unset_git_dir); | |
245 | delete($ENV{GIT_INDEX_FILE}); | |
246 | ||
247 | # Changes in the working tree need special treatment since they are | |
e0976dcf JK |
248 | # not part of the index. Remove any trailing slash from $workdir |
249 | # before starting to avoid double slashes in symlink targets. | |
250 | $workdir =~ s|/$||; | |
7e0abcec TH |
251 | for my $file (@working_tree) { |
252 | my $dir = dirname($file); | |
253 | unless (-d "$rdir/$dir") { | |
ceb1497a DA |
254 | mkpath("$rdir/$dir") or |
255 | exit_cleanup($tmpdir, 1); | |
7e0abcec | 256 | } |
1f229345 | 257 | if ($symlinks) { |
ceb1497a DA |
258 | symlink("$workdir/$file", "$rdir/$file") or |
259 | exit_cleanup($tmpdir, 1); | |
1f229345 | 260 | } else { |
ceb1497a DA |
261 | copy("$workdir/$file", "$rdir/$file") or |
262 | exit_cleanup($tmpdir, 1); | |
263 | ||
1f229345 | 264 | my $mode = stat("$workdir/$file")->mode; |
ceb1497a DA |
265 | chmod($mode, "$rdir/$file") or |
266 | exit_cleanup($tmpdir, 1); | |
1f229345 | 267 | } |
7e0abcec TH |
268 | } |
269 | ||
270 | # Changes to submodules require special treatment. This loop writes a | |
271 | # temporary file to both the left and right directories to show the | |
272 | # change in the recorded SHA1 for the submodule. | |
273 | for my $path (keys %submodule) { | |
951b551d | 274 | my $ok = 0; |
7e0abcec | 275 | if (defined($submodule{$path}{left})) { |
ceb1497a DA |
276 | $ok = write_to_file("$ldir/$path", |
277 | "Subproject commit $submodule{$path}{left}"); | |
7e0abcec TH |
278 | } |
279 | if (defined($submodule{$path}{right})) { | |
ceb1497a DA |
280 | $ok = write_to_file("$rdir/$path", |
281 | "Subproject commit $submodule{$path}{right}"); | |
7e0abcec | 282 | } |
ceb1497a | 283 | exit_cleanup($tmpdir, 1) if not $ok; |
7e0abcec TH |
284 | } |
285 | ||
286 | # Symbolic links require special treatment. The standard "git diff" | |
287 | # shows only the link itself, not the contents of the link target. | |
288 | # This loop replicates that behavior. | |
289 | for my $path (keys %symlink) { | |
951b551d | 290 | my $ok = 0; |
7e0abcec | 291 | if (defined($symlink{$path}{left})) { |
ceb1497a DA |
292 | $ok = write_to_file("$ldir/$path", |
293 | $symlink{$path}{left}); | |
7e0abcec TH |
294 | } |
295 | if (defined($symlink{$path}{right})) { | |
ceb1497a DA |
296 | $ok = write_to_file("$rdir/$path", |
297 | $symlink{$path}{right}); | |
7e0abcec | 298 | } |
ceb1497a | 299 | exit_cleanup($tmpdir, 1) if not $ok; |
7e0abcec TH |
300 | } |
301 | ||
ceb1497a | 302 | return ($ldir, $rdir, $tmpdir, @working_tree); |
7e0abcec TH |
303 | } |
304 | ||
305 | sub write_to_file | |
306 | { | |
307 | my $path = shift; | |
308 | my $value = shift; | |
309 | ||
310 | # Make sure the path to the file exists | |
311 | my $dir = dirname($path); | |
312 | unless (-d "$dir") { | |
ceb1497a | 313 | mkpath("$dir") or return 0; |
7e0abcec TH |
314 | } |
315 | ||
316 | # If the file already exists in that location, delete it. This | |
317 | # is required in the case of symbolic links. | |
ceb1497a | 318 | unlink($path); |
7e0abcec | 319 | |
ceb1497a | 320 | open(my $fh, '>', $path) or return 0; |
7e0abcec TH |
321 | print($fh $value); |
322 | close($fh); | |
ceb1497a DA |
323 | |
324 | return 1; | |
7e0abcec TH |
325 | } |
326 | ||
75cd7583 DA |
327 | sub main |
328 | { | |
329 | # parse command-line options. all unrecognized options and arguments | |
330 | # are passed through to the 'git diff' command. | |
c9bdd505 DA |
331 | my %opts = ( |
332 | difftool_cmd => undef, | |
333 | dirdiff => undef, | |
334 | extcmd => undef, | |
335 | gui => undef, | |
336 | help => undef, | |
337 | prompt => undef, | |
190f5475 DA |
338 | symlinks => $^O ne 'cygwin' && |
339 | $^O ne 'MSWin32' && $^O ne 'msys', | |
c9bdd505 | 340 | tool_help => undef, |
2b52123f | 341 | trust_exit_code => undef, |
c9bdd505 DA |
342 | ); |
343 | GetOptions('g|gui!' => \$opts{gui}, | |
344 | 'd|dir-diff' => \$opts{dirdiff}, | |
345 | 'h' => \$opts{help}, | |
346 | 'prompt!' => \$opts{prompt}, | |
347 | 'y' => sub { $opts{prompt} = 0; }, | |
1f229345 DA |
348 | 'symlinks' => \$opts{symlinks}, |
349 | 'no-symlinks' => sub { $opts{symlinks} = 0; }, | |
c9bdd505 DA |
350 | 't|tool:s' => \$opts{difftool_cmd}, |
351 | 'tool-help' => \$opts{tool_help}, | |
2b52123f DA |
352 | 'trust-exit-code' => \$opts{trust_exit_code}, |
353 | 'no-trust-exit-code' => sub { $opts{trust_exit_code} = 0; }, | |
c9bdd505 DA |
354 | 'x|extcmd:s' => \$opts{extcmd}); |
355 | ||
356 | if (defined($opts{help})) { | |
75cd7583 | 357 | usage(0); |
5c38ea31 | 358 | } |
c9bdd505 | 359 | if (defined($opts{tool_help})) { |
75cd7583 | 360 | print_tool_help(); |
3f94ff75 | 361 | } |
c9bdd505 DA |
362 | if (defined($opts{difftool_cmd})) { |
363 | if (length($opts{difftool_cmd}) > 0) { | |
364 | $ENV{GIT_DIFF_TOOL} = $opts{difftool_cmd}; | |
75cd7583 DA |
365 | } else { |
366 | print "No <tool> given for --tool=<tool>\n"; | |
367 | usage(1); | |
368 | } | |
369 | } | |
c9bdd505 DA |
370 | if (defined($opts{extcmd})) { |
371 | if (length($opts{extcmd}) > 0) { | |
372 | $ENV{GIT_DIFFTOOL_EXTCMD} = $opts{extcmd}; | |
75cd7583 DA |
373 | } else { |
374 | print "No <cmd> given for --extcmd=<cmd>\n"; | |
375 | usage(1); | |
376 | } | |
377 | } | |
c9bdd505 DA |
378 | if ($opts{gui}) { |
379 | my $guitool = Git::config('diff.guitool'); | |
af14b5cf | 380 | if (defined($guitool) && length($guitool) > 0) { |
75cd7583 DA |
381 | $ENV{GIT_DIFF_TOOL} = $guitool; |
382 | } | |
383 | } | |
384 | ||
2b52123f DA |
385 | if (!defined $opts{trust_exit_code}) { |
386 | $opts{trust_exit_code} = Git::config_bool('difftool.trustExitCode'); | |
387 | } | |
388 | if ($opts{trust_exit_code}) { | |
389 | $ENV{GIT_DIFFTOOL_TRUST_EXIT_CODE} = 'true'; | |
390 | } else { | |
391 | $ENV{GIT_DIFFTOOL_TRUST_EXIT_CODE} = 'false'; | |
392 | } | |
393 | ||
75cd7583 DA |
394 | # In directory diff mode, 'git-difftool--helper' is called once |
395 | # to compare the a/b directories. In file diff mode, 'git diff' | |
396 | # will invoke a separate instance of 'git-difftool--helper' for | |
397 | # each file that changed. | |
c9bdd505 | 398 | if (defined($opts{dirdiff})) { |
1f229345 | 399 | dir_diff($opts{extcmd}, $opts{symlinks}); |
75cd7583 | 400 | } else { |
c9bdd505 | 401 | file_diff($opts{prompt}); |
3f94ff75 TH |
402 | } |
403 | } | |
7e0abcec | 404 | |
75cd7583 DA |
405 | sub dir_diff |
406 | { | |
1f229345 | 407 | my ($extcmd, $symlinks) = @_; |
75cd7583 | 408 | my $rc; |
ceb1497a | 409 | my $error = 0; |
75cd7583 | 410 | my $repo = Git->repository(); |
94eaa806 | 411 | my $workdir = find_worktree(); |
ceb1497a DA |
412 | my ($a, $b, $tmpdir, @worktree) = |
413 | setup_dir_diff($repo, $workdir, $symlinks); | |
414 | ||
7e0abcec TH |
415 | if (defined($extcmd)) { |
416 | $rc = system($extcmd, $a, $b); | |
3f94ff75 | 417 | } else { |
7e0abcec TH |
418 | $ENV{GIT_DIFFTOOL_DIRDIFF} = 'true'; |
419 | $rc = system('git', 'difftool--helper', $a, $b); | |
d531174f | 420 | } |
7e0abcec TH |
421 | # If the diff including working copy files and those |
422 | # files were modified during the diff, then the changes | |
1f229345 DA |
423 | # should be copied back to the working tree. |
424 | # Do not copy back files when symlinks are used and the | |
425 | # external tool did not replace the original link with a file. | |
67aa147a JK |
426 | # |
427 | # These hashes are loaded lazily since they aren't needed | |
428 | # in the common case of --symlinks and the difftool updating | |
429 | # files through the symlink. | |
430 | my %wt_modified; | |
431 | my %tmp_modified; | |
432 | my $indices_loaded = 0; | |
433 | ||
1f229345 DA |
434 | for my $file (@worktree) { |
435 | next if $symlinks && -l "$b/$file"; | |
283abb2c DA |
436 | next if ! -f "$b/$file"; |
437 | ||
67aa147a JK |
438 | if (!$indices_loaded) { |
439 | %wt_modified = changed_files($repo->repo_path(), | |
440 | "$tmpdir/wtindex", "$workdir"); | |
441 | %tmp_modified = changed_files($repo->repo_path(), | |
442 | "$tmpdir/wtindex", "$b"); | |
443 | $indices_loaded = 1; | |
444 | } | |
445 | ||
446 | if (exists $wt_modified{$file} and exists $tmp_modified{$file}) { | |
447 | my $errmsg = "warning: Both files modified: "; | |
448 | $errmsg .= "'$workdir/$file' and '$b/$file'.\n"; | |
449 | $errmsg .= "warning: Working tree file has been left.\n"; | |
450 | $errmsg .= "warning:\n"; | |
283abb2c | 451 | warn $errmsg; |
ceb1497a | 452 | $error = 1; |
67aa147a | 453 | } elsif (exists $tmp_modified{$file}) { |
1f229345 | 454 | my $mode = stat("$b/$file")->mode; |
ceb1497a DA |
455 | copy("$b/$file", "$workdir/$file") or |
456 | exit_cleanup($tmpdir, 1); | |
457 | ||
458 | chmod($mode, "$workdir/$file") or | |
459 | exit_cleanup($tmpdir, 1); | |
05df5326 | 460 | } |
7e0abcec | 461 | } |
ceb1497a DA |
462 | if ($error) { |
463 | warn "warning: Temporary files exist in '$tmpdir'.\n"; | |
464 | warn "warning: You may want to cleanup or recover these.\n"; | |
465 | exit(1); | |
466 | } else { | |
467 | exit_cleanup($tmpdir, $rc); | |
468 | } | |
75cd7583 DA |
469 | } |
470 | ||
471 | sub file_diff | |
472 | { | |
473 | my ($prompt) = @_; | |
474 | ||
7e0abcec TH |
475 | if (defined($prompt)) { |
476 | if ($prompt) { | |
477 | $ENV{GIT_DIFFTOOL_PROMPT} = 'true'; | |
478 | } else { | |
479 | $ENV{GIT_DIFFTOOL_NO_PROMPT} = 'true'; | |
480 | } | |
481 | } | |
482 | ||
483 | $ENV{GIT_PAGER} = ''; | |
484 | $ENV{GIT_EXTERNAL_DIFF} = 'git-difftool--helper'; | |
485 | ||
486 | # ActiveState Perl for Win32 does not implement POSIX semantics of | |
487 | # exec* system call. It just spawns the given executable and finishes | |
488 | # the starting program, exiting with code 0. | |
489 | # system will at least catch the errors returned by git diff, | |
490 | # allowing the caller of git difftool better handling of failures. | |
491 | my $rc = system('git', 'diff', @ARGV); | |
492 | exit($rc | ($rc >> 8)); | |
493 | } | |
75cd7583 DA |
494 | |
495 | main(); |