Add async branch/tag dropdown and latest-commit bar

Adds two lazily-fetched UI pieces to match vanilla GitHub while keeping
initial page loads plain server-rendered HTML: a branch/tag selector
(native <dialog>, CSS anchor-positioned to its button, light-dismissed
via closedby="any") and a latest-commit bar above the file listing.
Both are populated by new /api/:owner/:repo/refs/:type and
/api/:owner/:repo/latest-commit/:branch/:path routes; the latter calls
GitHub's own /latest-commit JSON endpoint (the same one the React UI
uses) rather than scraping the full commit history page.

1 files changed, 41 insertions, 0 deletions

diff --git a/src/scraper.test.ts b/src/scraper.test.ts
index f9b60e8..56f14b0 100644
--- a/src/scraper.test.ts
+++ b/src/scraper.test.ts
@@ -4,7 +4,9 @@ import {
   getGitHubBlob,
   getGitHubCommits,
   getGitHubIssues,
+  getGitHubLatestCommit,
   getGitHubPulls,
+  getGitHubRefs,
   getGitHubRelease,
   getGitHubReleases,
   getGitHubRepo,
@@ -205,6 +207,45 @@ describe("GitHub scraper", () => {
       assert.ok(firstRelease.bodyHtml.length > 0);
     });
 
+    it("should fetch latest commit for a path", async () => {
+      const data = await getGitHubLatestCommit("actions", "deploy-pages", "main", "src");
+
+      assert.strictEqual(data.repo.owner, "actions");
+      assert.strictEqual(data.repo.name, "deploy-pages");
+      assert.ok(data.commit);
+      assert.strictEqual(data.commit.oid.length, 40);
+      assert.ok(data.commit.shortMessageHtml.length > 0);
+      assert.ok(data.commit.date.length > 0);
+      assert.ok(data.commit.authors.length > 0);
+    });
+
+    it("should fetch branches", async () => {
+      const data = await getGitHubRefs("actions", "deploy-pages", "branches");
+
+      assert.strictEqual(data.repo.owner, "actions");
+      assert.strictEqual(data.repo.name, "deploy-pages");
+      assert.strictEqual(data.type, "branches");
+
+      assert.ok(data.refs.length > 0);
+      const main = data.refs.find((ref) => ref.name === "main");
+      assert.ok(main);
+      assert.strictEqual(main.isDefault, true);
+    });
+
+    it("should fetch tags", async () => {
+      const data = await getGitHubRefs("actions", "deploy-pages", "tags");
+
+      assert.strictEqual(data.repo.owner, "actions");
+      assert.strictEqual(data.repo.name, "deploy-pages");
+      assert.strictEqual(data.type, "tags");
+
+      assert.ok(data.refs.length > 0);
+      const tag = data.refs.find((ref) => ref.name === "v5.0.0");
+      assert.ok(tag);
+      assert.ok(tag.date?.length);
+      assert.strictEqual(data.hasMore, true);
+    });
+
     it("should fetch single release", async () => {
       const data = await getGitHubRelease("actions", "deploy-pages", "v4.0.5");