Re: [PATCH 7/9] difftool: teach difftool to handle directory diffs

> Prior to this commit, the difftool utility could only open files one
> at a time.  The new '--dir-diff' option copies all the modified files
> to a temporary location and runs a directory diff on them.
>
> Signed-off-by: Tim Henigan <tim.henigan@gmail.com>
> ---
>
>  Documentation/git-difftool.txt |    6 ++
>  git-difftool--helper.sh        |   20 ++++--
>  git-difftool.perl              |  142 ++++++++++++++++++++++++++++++++++++----
>  3 files changed, 150 insertions(+), 18 deletions(-)
>
> diff --git a/git-difftool.perl b/git-difftool.perl
> index 8498089..0262c7a 100755
> --- a/git-difftool.perl
> +++ b/git-difftool.perl
> @@ -22,15 +28,109 @@ sub usage
>        print << 'USAGE';
>  usage: git difftool [-t|--tool=<tool>] [-x|--extcmd=<cmd>]
>                     [-y|--no-prompt]   [-g|--gui]
> +                    [-d|--dir-diff]
>                     ['git diff' options]
>  USAGE
>        exit($exitcode);
>  }
>
> +sub setup_dir_diff
> +{
> +       # Run the diff; exit immediately if no diff found
> +       my $repo = Git->repository();
> +       my $diffrtn = $repo->command_oneline(['diff', '--raw', '--no-abbrev', '-z', @ARGV]);
> +       exit(0) if (length($diffrtn) == 0);
> +
> +       # Setup temp directories
> +       my $tmpdir = tempdir('/tmp/git-diffall.XXXXX', CLEANUP => 1);