summaryrefslogtreecommitdiff
path: root/git-difftool.perl
diff options
context:
space:
mode:
Diffstat (limited to 'git-difftool.perl')
-rwxr-xr-xgit-difftool.perl92
1 files changed, 92 insertions, 0 deletions
diff --git a/git-difftool.perl b/git-difftool.perl
new file mode 100755
index 0000000000..ba5e60a45e
--- /dev/null
+++ b/git-difftool.perl
@@ -0,0 +1,92 @@
+#!/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));