]> asedeno.scripts.mit.edu Git - git.git/blobdiff - git-difftool.perl
difftool: move 'git-difftool' out of contrib
[git.git] / git-difftool.perl
diff --git a/git-difftool.perl b/git-difftool.perl
new file mode 100755 (executable)
index 0000000..8857ac8
--- /dev/null
@@ -0,0 +1,76 @@
+#!/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>] [-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') {
+                       $ENV{GIT_DIFFTOOL_NO_PROMPT} = 'true';
+                       next;
+               }
+               if ($arg eq '-h' || $arg eq '--help') {
+                       usage();
+               }
+               push @command, $arg;
+       }
+       return @command
+}
+
+setup_environment();
+exec(generate_command());