gitweb: cache $parent_commit info in git_blame()

diff --git a/gitweb/gitweb.perl b/gitweb/gitweb.perl
index ccbf5d47452d9ea14e44d20a1586097741a2451e..f992de223de5befb1b9fa2ead2661311fcbb87e8 100755 (executable)
--- a/gitweb/gitweb.perl
+++ b/gitweb/gitweb.perl
@@ -4666,11 +4666,17 @@ sub git_blame {
                                      esc_html($short_rev));
                        print "</td>\n";
                }
-               open (my $dd, "-|", git_cmd(), "rev-parse", "$full_rev^")
-                       or die_error(500, "Open git-rev-parse failed");
-               my $parent_commit = <$dd>;
-               close $dd;
-               chomp($parent_commit);
+               my $parent_commit;
+               if (!exists $meta->{'parent'}) {
+                       open (my $dd, "-|", git_cmd(), "rev-parse", "$full_rev^")
+                               or die_error(500, "Open git-rev-parse failed");
+                       $parent_commit = <$dd>;
+                       close $dd;
+                       chomp($parent_commit);
+                       $meta->{'parent'} = $parent_commit;
+               } else {
+                       $parent_commit = $meta->{'parent'};
+               }
                my $blamed = href(action => 'blame',
                                  file_name => $meta->{'filename'},
                                  hash_base => $parent_commit);