[RFC/PATCH] gitweb: Add "all parents" (-m) view to commitdiff

[Jakub Narebski <jnareb@gmail.com>]

Add "all parents" view/link to commitdiff, which uses '-m' to show
diff to all parents of a merge commit.

This is instead of having link "combined" to combined (-c) or compact
combined (--cc) diff for a merge commit, till we have syntax
highlighting for combined diff.

Signed-off-by: Jakub Narebski <jnareb@gmail.com>
---
 gitweb/gitweb.perl |   11 ++++++++++-
 1 files changed, 10 insertions(+), 1 deletions(-)

diff --git a/gitweb/gitweb.perl b/gitweb/gitweb.perl
index 255487d..84b4abb 100755
--- a/gitweb/gitweb.perl
+++ b/gitweb/gitweb.perl
@@ -3289,7 +3289,7 @@ sub git_commitdiff {
 			                       hash=>$hash, hash_parent=>$hash_parent)},
 			        "raw");
 
-		if (defined $hash_parent) {
+		if (defined $hash_parent && substr($hash_parent, 0, 1) ne '-') {
 			# commitdiff with two commits given
 			$formats_nav .=
 				' (' .
@@ -3310,6 +3310,15 @@ sub git_commitdiff {
 				')';
 		} else {
 			# merge commit
+			$formats_nav .= ' | ';
+			if (defined $hash_parent && $hash_parent eq '-m') {
+				$formats_nav .= 'all parents';
+			} else {
+				$formats_nav .=
+									$cgi->a({-href => href(action=>"commitdiff",
+					                       hash=>$hash, hash_parent=>'-m')},
+					        'all parents');
+			}
 			$formats_nav .=
 				' (' .
 				join(' ', map {
-- 
1.4.2.1