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);
21 my $DIR = abs_path(dirname($0));
27 usage: git difftool [-t|--tool=<tool>] [-x|--extcmd=<cmd>]
28 [-y|--no-prompt] [-g|--gui]
36 $ENV{PATH} = "$DIR:$ENV{PATH}";
38 $ENV{GIT_EXTERNAL_DIFF} = 'git-difftool--helper';
44 if ($^O eq 'MSWin32' || $^O eq 'msys') {
52 my @command = (exe('git'), 'diff');
61 if ($arg eq '-t' || $arg eq '--tool') {
62 usage() if $#ARGV <= $idx;
63 $ENV{GIT_DIFF_TOOL} = $ARGV[$idx + 1];
67 if ($arg =~ /^--tool=/) {
68 $ENV{GIT_DIFF_TOOL} = substr($arg, 7);
71 if ($arg eq '-x' || $arg eq '--extcmd') {
72 usage() if $#ARGV <= $idx;
73 $ENV{GIT_DIFFTOOL_EXTCMD} = $ARGV[$idx + 1];
77 if ($arg =~ /^--extcmd=/) {
78 $ENV{GIT_DIFFTOOL_EXTCMD} = substr($arg, 9);
81 if ($arg eq '-g' || $arg eq '--gui') {
83 my $tool = Git::command_oneline('config',
86 $ENV{GIT_DIFF_TOOL} = $tool;
91 if ($arg eq '-y' || $arg eq '--no-prompt') {
92 $ENV{GIT_DIFFTOOL_NO_PROMPT} = 'true';
93 delete $ENV{GIT_DIFFTOOL_PROMPT};
96 if ($arg eq '--prompt') {
97 $ENV{GIT_DIFFTOOL_PROMPT} = 'true';
98 delete $ENV{GIT_DIFFTOOL_NO_PROMPT};
101 if ($arg eq '-h' || $arg eq '--help') {
111 # ActiveState Perl for Win32 does not implement POSIX semantics of
112 # exec* system call. It just spawns the given executable and finishes
113 # the starting program, exiting with code 0.
114 # system will at least catch the errors returned by git diff,
115 # allowing the caller of git difftool better handling of failures.
116 my $rc = system(generate_command());
117 exit($rc | ($rc >> 8));