2 # Copyright (c) 2009, 2010 David Aguilar
4 # This is a wrapper around the GIT_EXTERNAL_DIFF-compatible
5 # git-difftool--helper script.
7 # This script exports GIT_EXTERNAL_DIFF and GIT_PAGER for use by git.
8 # GIT_DIFFTOOL_NO_PROMPT, GIT_DIFFTOOL_PROMPT, and GIT_DIFF_TOOL
9 # are exported for use by git-difftool--helper.
11 # Any arguments that are unknown to this script are forwarded to 'git diff'.
17 use File::Basename qw(dirname);
18 use Getopt::Long qw(:config pass_through);
24 usage: git difftool [-t|--tool=<tool>]
27 [--prompt] [-y|--no-prompt]
35 my $DIR = abs_path(dirname($0));
36 $ENV{PATH} = "$DIR:$ENV{PATH}";
38 $ENV{GIT_EXTERNAL_DIFF} = 'git-difftool--helper';
44 if ($^O eq 'MSWin32' || $^O eq 'msys') {
50 # parse command-line options. all unrecognized options and arguments
51 # are passed through to the 'git diff' command.
52 my ($difftool_cmd, $extcmd, $gui, $help, $prompt);
53 GetOptions('g|gui!' => \$gui,
55 'prompt!' => \$prompt,
56 'y' => sub { $prompt = 0; },
57 't|tool:s' => \$difftool_cmd,
58 'x|extcmd:s' => \$extcmd);
63 if (defined($difftool_cmd)) {
64 if (length($difftool_cmd) > 0) {
65 $ENV{GIT_DIFF_TOOL} = $difftool_cmd;
67 print "No <tool> given for --tool=<tool>\n";
71 if (defined($extcmd)) {
72 if (length($extcmd) > 0) {
73 $ENV{GIT_DIFFTOOL_EXTCMD} = $extcmd;
75 print "No <cmd> given for --extcmd=<cmd>\n";
81 $guitool = Git::config('diff.guitool');
82 if (length($guitool) > 0) {
83 $ENV{GIT_DIFF_TOOL} = $guitool;
86 if (defined($prompt)) {
88 $ENV{GIT_DIFFTOOL_PROMPT} = 'true';
90 $ENV{GIT_DIFFTOOL_NO_PROMPT} = 'true';
95 my @command = (exe('git'), 'diff', @ARGV);
97 # ActiveState Perl for Win32 does not implement POSIX semantics of
98 # exec* system call. It just spawns the given executable and finishes
99 # the starting program, exiting with code 0.
100 # system will at least catch the errors returned by git diff,
101 # allowing the caller of git difftool better handling of failures.
102 my $rc = system(@command);
103 exit($rc | ($rc >> 8));