contrib: contacts: interpret committish akin to format-patch

As a convenience, accept the same style <since> committish as accepted
by git-format-patch. For example:

  % git contacts origin

will consider commits in the current branch built atop 'origin', just as
"git format-patch origin" will format commits built atop 'origin'.

Signed-off-by: Eric Sunshine <sunshine@sunshineco.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

diff --git a/contrib/contacts/git-contacts b/contrib/contacts/git-contacts
index 1686ff3..4553add 100755 (executable)
--- a/contrib/contacts/git-contacts
+++ b/contrib/contacts/git-contacts
@@ -102,9 +102,26 @@ sub scan_patch_file {
        close $f;
 }
 
+sub parse_rev_args {
+       my @args = @_;
+       open my $f, '-|',
+               qw(git rev-parse --revs-only --default HEAD --symbolic), @args
+               or die;
+       my @revs;
+       while (<$f>) {
+               chomp;
+               push @revs, $_;
+       }
+       close $f;
+       return @revs if scalar(@revs) != 1;
+       return "^$revs[0]", 'HEAD' unless $revs[0] =~ /^-/;
+       return $revs[0], 'HEAD';
+}
+
 sub scan_rev_args {
        my ($commits, $args) = @_;
-       open my $f, '-|', qw(git rev-list --reverse), @$args or die;
+       my @revs = parse_rev_args(@$args);
+       open my $f, '-|', qw(git rev-list --reverse), @revs or die;
        while (<$f>) {
                chomp;
                my $id = $_;