fix(head): use the default branch for README imagesHEADmaster

The rewrite to plain/ assumed main when the page had no ?h=, so repositories on
master got a 404 for every relative image in their README.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

1 files changed, 3 insertions, 2 deletions

diff --git a/head.html b/head.html
index 8f1b96b..5b1f413 100644
--- a/head.html
+++ b/head.html
@@ -21,11 +21,12 @@ document.addEventListener('DOMContentLoaded', function() {
     var m = window.location.pathname.match(/^\/([^/]+)\/about\//);
     if (m) {
       var repo = m[1];
-      var branch = (new URLSearchParams(window.location.search)).get('h') || 'main';
+      // No ?h= on the page: leave it out too, so cgit uses the repository's default branch.
+      var branch = (new URLSearchParams(window.location.search)).get('h');
       document.querySelectorAll('div#summary img').forEach(function(img) {
         var src = img.getAttribute('src');
         if (src && !/^https?:\/\//.test(src) && !/^\//.test(src)) {
-          img.src = '/' + repo + '/plain/' + src + '?h=' + branch;
+          img.src = '/' + repo + '/plain/' + src + (branch ? '?h=' + encodeURIComponent(branch) : '');
         }
       });
     }