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#!/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, and
# GIT_DIFFTOOL_NO_PROMPT and GIT_DIFF_TOOL 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>] [--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;
return defined $ENV{COMSPEC} ? "$exe.exe" : $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' or $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 '--no-prompt') {
$ENV{GIT_DIFFTOOL_NO_PROMPT} = 'true';
next;
}
if ($arg eq '-h' or $arg eq '--help') {
usage();
}
push @command, $arg;
}
return @command
}
setup_environment();
exec(generate_command());
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