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

#!/usr/bin/env perl
# Copyright (c) 2009 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 strict;
use warnings;
use Cwd qw(abs_path);
use File::Basename qw(dirname);

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


sub usage
{
	print << 'USAGE';
usage: git difftool [--tool=<tool>] [-y|--no-prompt] ["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 '-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 DA	1	#!/usr/bin/env perl
	2	# Copyright (c) 2009 David Aguilar
	3	#
	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'.
	12
	13	use strict;
	14	use warnings;
	15	use Cwd qw(abs_path);
	16	use File::Basename qw(dirname);
	17
	18	my $DIR = abs_path(dirname($0));
	19
	20
	21	sub usage
	22	{
	23	print << 'USAGE';
8b733222	24	usage: git difftool [--tool=<tool>] [-y\|--no-prompt] ["git diff" options]
5c38ea31 DA	25	USAGE
	26	exit 1;
	27	}
	28
	29	sub setup_environment
	30	{
	31	$ENV{PATH} = "$DIR:$ENV{PATH}";
	32	$ENV{GIT_PAGER} = '';
afcbc8e7	33	$ENV{GIT_EXTERNAL_DIFF} = 'git-difftool--helper';
5c38ea31 DA	34	}
	35
	36	sub exe
	37	{
	38	my $exe = shift;
46ae156d DA	39	if ($^O eq 'MSWin32' \|\| $^O eq 'msys') {
	40	return "$exe.exe";
	41	}
	42	return $exe;
5c38ea31 DA	43	}
	44
	45	sub generate_command
	46	{
	47	my @command = (exe('git'), 'diff');
	48	my $skip_next = 0;
	49	my $idx = -1;
	50	for my $arg (@ARGV) {
	51	$idx++;
	52	if ($skip_next) {
	53	$skip_next = 0;
	54	next;
	55	}
46ae156d	56	if ($arg eq '-t' \|\| $arg eq '--tool') {
5c38ea31	57	usage() if $#ARGV <= $idx;
2464456a	58	$ENV{GIT_DIFF_TOOL} = $ARGV[$idx + 1];
5c38ea31 DA	59	$skip_next = 1;
	60	next;
	61	}
	62	if ($arg =~ /^--tool=/) {
2464456a	63	$ENV{GIT_DIFF_TOOL} = substr($arg, 7);
5c38ea31 DA	64	next;
5c38ea31 DA	65	}
8b733222	66	if ($arg eq '-y' \|\| $arg eq '--no-prompt') {
5c38ea31	67	$ENV{GIT_DIFFTOOL_NO_PROMPT} = 'true';
a904392e DA	68	delete $ENV{GIT_DIFFTOOL_PROMPT};
	69	next;
	70	}
	71	if ($arg eq '--prompt') {
	72	$ENV{GIT_DIFFTOOL_PROMPT} = 'true';
	73	delete $ENV{GIT_DIFFTOOL_NO_PROMPT};
5c38ea31 DA	74	next;
5c38ea31 DA	75	}
8b733222	76	if ($arg eq '-h' \|\| $arg eq '--help') {
5c38ea31 DA	77	usage();
	78	}
	79	push @command, $arg;
	80	}
	81	return @command
	82	}
	83
	84	setup_environment();
677fbff8 AR	85
	86	# ActiveState Perl for Win32 does not implement POSIX semantics of
	87	# exec* system call. It just spawns the given executable and finishes
	88	# the starting program, exiting with code 0.
	89	# system will at least catch the errors returned by git diff,
	90	# allowing the caller of git difftool better handling of failures.
e8d11804 AR	91	my $rc = system(generate_command());
e8d11804 AR	92	exit($rc \| ($rc >> 8));