contrib/difftool/git-difftool

   1 #!/usr/bin/env perl
   2 # Copyright (c) 2009 David Aguilar
   3 #
   4 # This is a wrapper around the GIT_EXTERNAL_DIFF-compatible
   5 # git-difftool-helper script.  This script exports
   6 # GIT_EXTERNAL_DIFF and GIT_PAGER for use by git, and
   7 # GIT_NO_PROMPT and GIT_MERGE_TOOL for use by git-difftool-helper.
   8 # Any arguments that are unknown to this script are forwarded to 'git diff'.
   9
  10 use strict;
  11 use warnings;
  12 use Cwd qw(abs_path);
  13 use File::Basename qw(dirname);
  14
  15 my $DIR = abs_path(dirname($0));
  16
  17
  18 sub usage
  19 {
  20         print << 'USAGE';
  21
  22 usage: git difftool [--no-prompt] [--tool=tool] ["git diff" options]
  23 USAGE
  24         exit 1;
  25 }
  26
  27 sub setup_environment
  28 {
  29         $ENV{PATH} = "$DIR:$ENV{PATH}";
  30         $ENV{GIT_PAGER} = '';
  31         $ENV{GIT_EXTERNAL_DIFF} = 'git-difftool-helper';
  32 }
  33
  34 sub exe
  35 {
  36         my $exe = shift;
  37         return defined $ENV{COMSPEC} ? "$exe.exe" : $exe;
  38 }
  39
  40 sub generate_command
  41 {
  42         my @command = (exe('git'), 'diff');
  43         my $skip_next = 0;
  44         my $idx = -1;
  45         for my $arg (@ARGV) {
  46                 $idx++;
  47                 if ($skip_next) {
  48                         $skip_next = 0;
  49                         next;
  50                 }
  51                 if ($arg eq '-t' or $arg eq '--tool') {
  52                         usage() if $#ARGV <= $idx;
  53                         $ENV{GIT_MERGE_TOOL} = $ARGV[$idx + 1];
  54                         $skip_next = 1;
  55                         next;
  56                 }
  57                 if ($arg =~ /^--tool=/) {
  58                         $ENV{GIT_MERGE_TOOL} = substr($arg, 7);
  59                         next;
  60                 }
  61                 if ($arg eq '--no-prompt') {
  62                         $ENV{GIT_DIFFTOOL_NO_PROMPT} = 'true';
  63                         next;
  64                 }
  65                 if ($arg eq '-h' or $arg eq '--help') {
  66                         usage();
  67                 }
  68                 push @command, $arg;
  69         }
  70         return @command
  71 }
  72
  73 setup_environment();
  74 exec(generate_command());