[thirdparty/git.git] / git-difftool.perl

#!/usr/bin/env perl
# Copyright (c) 2009, 2010 David Aguilar
#
# This is a wrapper around the GIT_EXTERNAL_DIFF-compatible
# git-difftool--helper script.
#
# This script exports GIT_EXTERNAL_DIFF and GIT_PAGER for use by git.
# GIT_DIFFTOOL_NO_PROMPT, GIT_DIFFTOOL_PROMPT, and GIT_DIFF_TOOL
# are exported for use by git-difftool--helper.
#
# Any arguments that are unknown to this script are forwarded to 'git diff'.

use 5.008;
use strict;
use warnings;
use Cwd qw(abs_path);
use File::Basename qw(dirname);

require Git;

my $DIR = abs_path(dirname($0));


sub usage
{
	print << 'USAGE';
usage: git difftool [-t|--tool=<tool>] [-x|--extcmd=<cmd>]
                    [-y|--no-prompt]   [-g|--gui]
                    ['git diff' options]
USAGE
	exit 1;
}

sub setup_environment
{
	$ENV{PATH} = "$DIR:$ENV{PATH}";
	$ENV{GIT_PAGER} = '';
	$ENV{GIT_EXTERNAL_DIFF} = 'git-difftool--helper';
}

sub exe
{
	my $exe = shift;
	if ($^O eq 'MSWin32' || $^O eq 'msys') {
		return "$exe.exe";
	}
	return $exe;
}

sub generate_command
{
	my @command = (exe('git'), 'diff');
	my $skip_next = 0;
	my $idx = -1;
	for my $arg (@ARGV) {
		$idx++;
		if ($skip_next) {
			$skip_next = 0;
			next;
		}
		if ($arg eq '-t' || $arg eq '--tool') {
			usage() if $#ARGV <= $idx;
			$ENV{GIT_DIFF_TOOL} = $ARGV[$idx + 1];
			$skip_next = 1;
			next;
		}
		if ($arg =~ /^--tool=/) {
			$ENV{GIT_DIFF_TOOL} = substr($arg, 7);
			next;
		}
		if ($arg eq '-x' || $arg eq '--extcmd') {
			usage() if $#ARGV <= $idx;
			$ENV{GIT_DIFFTOOL_EXTCMD} = $ARGV[$idx + 1];
			$skip_next = 1;
			next;
		}
		if ($arg =~ /^--extcmd=/) {
			$ENV{GIT_DIFFTOOL_EXTCMD} = substr($arg, 9);
			next;
		}
		if ($arg eq '-g' || $arg eq '--gui') {
			eval {
				my $tool = Git::command_oneline('config',
				                                'diff.guitool');
				if (length($tool)) {
					$ENV{GIT_DIFF_TOOL} = $tool;
				}
			};
			next;
		}
		if ($arg eq '-y' || $arg eq '--no-prompt') {
			$ENV{GIT_DIFFTOOL_NO_PROMPT} = 'true';
			delete $ENV{GIT_DIFFTOOL_PROMPT};
			next;
		}
		if ($arg eq '--prompt') {
			$ENV{GIT_DIFFTOOL_PROMPT} = 'true';
			delete $ENV{GIT_DIFFTOOL_NO_PROMPT};
			next;
		}
		if ($arg eq '-h' || $arg eq '--help') {
			usage();
		}
		push @command, $arg;
	}
	return @command
}

setup_environment();

# ActiveState Perl for Win32 does not implement POSIX semantics of
# exec* system call. It just spawns the given executable and finishes
# the starting program, exiting with code 0.
# system will at least catch the errors returned by git diff,
# allowing the caller of git difftool better handling of failures.
my $rc = system(generate_command());
exit($rc | ($rc >> 8));
Commit	Line	Data
5c38ea31	1	#!/usr/bin/env perl
f47f1e2c	2	# Copyright (c) 2009, 2010 David Aguilar
5c38ea31 DA	3	#
5c38ea31 DA	4	# This is a wrapper around the GIT_EXTERNAL_DIFF-compatible
a904392e DA	5	# git-difftool--helper script.
	6	#
	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.
	10	#
5c38ea31 DA	11	# Any arguments that are unknown to this script are forwarded to 'git diff'.
5c38ea31 DA	12
d48b2841	13	use 5.008;
5c38ea31 DA	14	use strict;
	15	use warnings;
	16	use Cwd qw(abs_path);
	17	use File::Basename qw(dirname);
	18
4cefa495 DA	19	require Git;
4cefa495 DA	20
5c38ea31 DA	21	my $DIR = abs_path(dirname($0));
	22
	23
	24	sub usage
	25	{
	26	print << 'USAGE';
f47f1e2c DA	27	usage: git difftool [-t\|--tool=<tool>] [-x\|--extcmd=<cmd>]
	28	[-y\|--no-prompt] [-g\|--gui]
	29	['git diff' options]
5c38ea31 DA	30	USAGE
	31	exit 1;
	32	}
	33
	34	sub setup_environment
	35	{
	36	$ENV{PATH} = "$DIR:$ENV{PATH}";
	37	$ENV{GIT_PAGER} = '';
afcbc8e7	38	$ENV{GIT_EXTERNAL_DIFF} = 'git-difftool--helper';
5c38ea31 DA	39	}
	40
	41	sub exe
	42	{
	43	my $exe = shift;
46ae156d DA	44	if ($^O eq 'MSWin32' \|\| $^O eq 'msys') {
	45	return "$exe.exe";
	46	}
	47	return $exe;
5c38ea31 DA	48	}
	49
	50	sub generate_command
	51	{
	52	my @command = (exe('git'), 'diff');
	53	my $skip_next = 0;
	54	my $idx = -1;
	55	for my $arg (@ARGV) {
	56	$idx++;
	57	if ($skip_next) {
	58	$skip_next = 0;
	59	next;
	60	}
46ae156d	61	if ($arg eq '-t' \|\| $arg eq '--tool') {
5c38ea31	62	usage() if $#ARGV <= $idx;
2464456a	63	$ENV{GIT_DIFF_TOOL} = $ARGV[$idx + 1];
5c38ea31 DA	64	$skip_next = 1;
	65	next;
	66	}
	67	if ($arg =~ /^--tool=/) {
2464456a	68	$ENV{GIT_DIFF_TOOL} = substr($arg, 7);
5c38ea31 DA	69	next;
5c38ea31 DA	70	}
f47f1e2c DA	71	if ($arg eq '-x' \|\| $arg eq '--extcmd') {
	72	usage() if $#ARGV <= $idx;
	73	$ENV{GIT_DIFFTOOL_EXTCMD} = $ARGV[$idx + 1];
	74	$skip_next = 1;
	75	next;
	76	}
	77	if ($arg =~ /^--extcmd=/) {
	78	$ENV{GIT_DIFFTOOL_EXTCMD} = substr($arg, 9);
	79	next;
	80	}
4cefa495	81	if ($arg eq '-g' \|\| $arg eq '--gui') {
42accaec DA	82	eval {
	83	my $tool = Git::command_oneline('config',
	84	'diff.guitool');
	85	if (length($tool)) {
	86	$ENV{GIT_DIFF_TOOL} = $tool;
	87	}
	88	};
4cefa495 DA	89	next;
4cefa495 DA	90	}
8b733222	91	if ($arg eq '-y' \|\| $arg eq '--no-prompt') {
5c38ea31	92	$ENV{GIT_DIFFTOOL_NO_PROMPT} = 'true';
a904392e DA	93	delete $ENV{GIT_DIFFTOOL_PROMPT};
	94	next;
	95	}
	96	if ($arg eq '--prompt') {
	97	$ENV{GIT_DIFFTOOL_PROMPT} = 'true';
	98	delete $ENV{GIT_DIFFTOOL_NO_PROMPT};
5c38ea31 DA	99	next;
5c38ea31 DA	100	}
8b733222	101	if ($arg eq '-h' \|\| $arg eq '--help') {
5c38ea31 DA	102	usage();
	103	}
	104	push @command, $arg;
	105	}
	106	return @command
	107	}
	108
	109	setup_environment();
677fbff8 AR	110
	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.
e8d11804 AR	116	my $rc = system(generate_command());
e8d11804 AR	117	exit($rc \| ($rc >> 8));