gitweb: Improve "next" link in commitdiff view

Check if 'hp' (hash_parent) parameter to 'commitdiff' view is one of
'h' (hash) commit parents, i.e. if commitdiff is of the form
"<commit>^<n> <commit>", and mark it as such in the bottom part of
navigation bar. The "next" link in commitdiff view was introduced
in commit 151602df00b8e5c5b4a8193f59a94b85f9b5aebc

If 'hb' is n-th parent of 'h', show the following at the bottom
of navigation bar:
  (from parent n: _commit_)

Signed-off-by: Jakub Narebski <jnareb@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

diff --git a/gitweb/gitweb.perl b/gitweb/gitweb.perl
index e2d52222bfbaedbaa3743cc70e01f69fba3629bb..4561d4ef11e975be410b135b4dec0381ce307d20 100755 (executable)
--- a/gitweb/gitweb.perl
+++ b/gitweb/gitweb.perl
@@ -4479,7 +4479,14 @@ sub git_commitdiff {
                                $hash_parent_short = substr($hash_parent, 0, 7);
                        }
                        $formats_nav .=
-                               ' (from: ' .
+                               ' (from';
+                       for (my $i = 0; $i < @{$co{'parents'}}; $i++) {
+                               if ($co{'parents'}[$i] eq $hash_parent) {
+                                       $formats_nav .= ' parent ' . ($i+1);
+                                       last;
+                               }
+                       }
+                       $formats_nav .= ': ' .
                                $cgi->a({-href => href(action=>"commitdiff",
                                                       hash=>$hash_parent)},
                                        esc_html($hash_parent_short)) .