MSVC: fix poll-related macro redefines
[git/dscho.git] / git-difftool.perl
blob09b65f1770c09824df5543d208d1df0e9a60d831
1 #!/usr/bin/env perl
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'.
13 use 5.008;
14 use strict;
15 use warnings;
16 use Cwd qw(abs_path);
17 use File::Basename qw(dirname);
19 require Git;
21 my $DIR = abs_path(dirname($0));
24 sub usage
26 print << 'USAGE';
27 usage: git difftool [-t|--tool=<tool>] [-x|--extcmd=<cmd>]
28 [-y|--no-prompt] [-g|--gui]
29 ['git diff' options]
30 USAGE
31 exit 1;
34 sub setup_environment
36 $ENV{PATH} = "$DIR:$ENV{PATH}";
37 $ENV{GIT_PAGER} = '';
38 $ENV{GIT_EXTERNAL_DIFF} = 'git-difftool--helper';
41 sub exe
43 my $exe = shift;
44 if ($^O eq 'MSWin32' || $^O eq 'msys') {
45 return "$exe.exe";
47 return $exe;
50 sub generate_command
52 my @command = (exe('git'), 'diff');
53 my $skip_next = 0;
54 my $idx = -1;
55 my $prompt = '';
56 for my $arg (@ARGV) {
57 $idx++;
58 if ($skip_next) {
59 $skip_next = 0;
60 next;
62 if ($arg eq '-t' || $arg eq '--tool') {
63 usage() if $#ARGV <= $idx;
64 $ENV{GIT_DIFF_TOOL} = $ARGV[$idx + 1];
65 $skip_next = 1;
66 next;
68 if ($arg =~ /^--tool=/) {
69 $ENV{GIT_DIFF_TOOL} = substr($arg, 7);
70 next;
72 if ($arg eq '-x' || $arg eq '--extcmd') {
73 usage() if $#ARGV <= $idx;
74 $ENV{GIT_DIFFTOOL_EXTCMD} = $ARGV[$idx + 1];
75 $skip_next = 1;
76 next;
78 if ($arg =~ /^--extcmd=/) {
79 $ENV{GIT_DIFFTOOL_EXTCMD} = substr($arg, 9);
80 next;
82 if ($arg eq '-g' || $arg eq '--gui') {
83 eval {
84 my $tool = Git::command_oneline('config',
85 'diff.guitool');
86 if (length($tool)) {
87 $ENV{GIT_DIFF_TOOL} = $tool;
90 next;
92 if ($arg eq '-y' || $arg eq '--no-prompt') {
93 $prompt = 'no';
94 next;
96 if ($arg eq '--prompt') {
97 $prompt = 'yes';
98 next;
100 if ($arg eq '-h') {
101 usage();
103 push @command, $arg;
105 if ($prompt eq 'yes') {
106 $ENV{GIT_DIFFTOOL_PROMPT} = 'true';
107 } elsif ($prompt eq 'no') {
108 $ENV{GIT_DIFFTOOL_NO_PROMPT} = 'true';
110 return @command
113 setup_environment();
115 # ActiveState Perl for Win32 does not implement POSIX semantics of
116 # exec* system call. It just spawns the given executable and finishes
117 # the starting program, exiting with code 0.
118 # system will at least catch the errors returned by git diff,
119 # allowing the caller of git difftool better handling of failures.
120 my $rc = system(generate_command());
121 exit($rc | ($rc >> 8));