repobrowse: memoize git symbolic-ref resolution

The "HEAD" symbolic ref is rarely changed, so
memoize it for now and avoid exposing it in URLs.

1 files changed, 11 insertions, 0 deletions

diff --git a/lib/PublicInbox/Repo.pm b/lib/PublicInbox/Repo.pm
index ceebe5c4..f0cb4b3d 100644
--- a/lib/PublicInbox/Repo.pm
+++ b/lib/PublicInbox/Repo.pm
@@ -46,4 +46,15 @@ sub cloneurl {
         $self->{cloneurl} = $url;
 }
 
+sub tip {
+        my ($self) = @_;
+        $self->{-tip} ||= do {
+                if ($self->{vcs} eq 'git') {
+                        my $t = $self->{git}->qx(qw(symbolic-ref --short HEAD));
+                        chomp $t;
+                        $t;
+                }
+        };
+}
+
 1;