Add GitHub releases support

Scrapes releases page HTML to display version tags, publish dates, and changelog content.

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

3 files changed, 83 insertions, 0 deletions

diff --git a/cgithub/src/index.ts b/cgithub/src/index.ts
index 4486dff..2f8efef 100644
--- a/cgithub/src/index.ts
+++ b/cgithub/src/index.ts
@@ -9,6 +9,7 @@ import {
   getGitHubBlob,
   getGitHubCommits,
   getGitHubIssues,
+  getGitHubReleases,
   getGitHubRepo,
   getGitHubTree,
   GitHubHTTPError,
@@ -73,6 +74,11 @@ app.get("/:owner/:repo/commits/:branch/:path{.*}?", async (c) => {
   return tryRender(c, "commits.eta", getGitHubCommits(owner, repo, branch, path));
 });
 
+app.get("/:owner/:repo/releases", async (c) => {
+  const { owner, repo } = c.req.param();
+  return tryRender(c, "releases.eta", getGitHubReleases(owner, repo));
+});
+
 app.all("*", async (c) => {
   const path = c.req.path;
   c.header("Referrer-Policy", "no-referrer");
diff --git a/cgithub/src/scraper.test.ts b/cgithub/src/scraper.test.ts
index 7cafd9c..8c11317 100644
--- a/cgithub/src/scraper.test.ts
+++ b/cgithub/src/scraper.test.ts
@@ -4,6 +4,7 @@ import {
   getGitHubBlob,
   getGitHubCommits,
   getGitHubIssues,
+  getGitHubReleases,
   getGitHubRepo,
   getGitHubTree,
   GitHubHTTPError,
@@ -159,6 +160,19 @@ describe("GitHub scraper", () => {
 
       assert.ok(data.commitGroups.length > 0);
     });
+
+    it("should fetch releases", async () => {
+      const data = await getGitHubReleases("actions", "deploy-pages");
+
+      assert.strictEqual(data.repo.owner, "actions");
+      assert.strictEqual(data.repo.name, "deploy-pages");
+
+      assert.ok(data.releases.length > 0);
+      const firstRelease = data.releases[0];
+      assert.ok(firstRelease.tagName.length > 0);
+      assert.ok(firstRelease.title.match(/^v\d/));
+      assert.ok(firstRelease.publishedAt.length > 0);
+    });
   });
 
   describe("rich file types", () => {
diff --git a/cgithub/src/scraper.ts b/cgithub/src/scraper.ts
index 71d0e3e..e52ddac 100644
--- a/cgithub/src/scraper.ts
+++ b/cgithub/src/scraper.ts
@@ -184,6 +184,17 @@ export interface GitHubCommits extends GitHubNav {
   commitGroups: CommitGroup[];
 }
 
+interface Release {
+  tagName: string;
+  title: string;
+  publishedAt: string;
+  bodyHtml: string;
+}
+
+export interface GitHubReleases extends GitHubCommon {
+  releases: Release[];
+}
+
 async function fetchGitHubPage(path: string): Promise<string> {
   // GitHub throttles/blocks requests without realistic browser headers.
   // These headers make the request appear as a standard browser visit.
@@ -403,3 +414,55 @@ export async function getGitHubCommits(
     commitGroups: payload.commitGroups,
   };
 }
+
+export async function getGitHubReleases(owner: string, repo: string): Promise<GitHubReleases> {
+  const html = await fetchGitHubPage(`${owner}/${repo}/releases`);
+
+  // Releases page doesn't have embedded JSON, so we parse HTML directly
+  const releases: Release[] = [];
+
+  // Find all h2 tags with version numbers
+  const h2Regex = /<h2[^>]*id="([^"]*)"[^>]*>(v[^<]*)<\/h2>/g;
+
+  for (const h2Match of html.matchAll(h2Regex)) {
+    const id = h2Match[1];
+    const title = h2Match[2].trim();
+
+    // Find the section containing this h2
+    const sectionRegex = new RegExp(
+      `<section[^>]*>\\s*<h2[^>]*id="${id}"[^>]*>[^<]*<\\/h2>([\\s\\S]*?)<\\/section>`,
+      "s",
+    );
+    const sectionMatch = html.match(sectionRegex);
+    if (!sectionMatch) continue;
+
+    const sectionHtml = sectionMatch[1];
+
+    // Extract tag name from link
+    const tagMatch = sectionHtml.match(/<a[^>]*href="[^"]*\/tree\/([^"]+)"[^>]*>/);
+    const tagName = tagMatch?.[1] || title;
+
+    // Extract published date
+    const dateMatch = sectionHtml.match(/<relative-time[^>]*datetime="([^"]*)"[^>]*>/);
+    const publishedAt = dateMatch?.[1] || "";
+
+    // Extract body HTML (markdown content)
+    const bodyMatch = sectionHtml.match(/<div[^>]*class="[^"]*markdown-body[^"]*"[^>]*>([\s\S]*?)<\/div>/);
+    const bodyHtml = bodyMatch?.[1]?.trim() || "";
+
+    releases.push({
+      tagName,
+      title,
+      publishedAt,
+      bodyHtml,
+    });
+  }
+
+  return {
+    repo: {
+      owner,
+      name: repo,
+    },
+    releases,
+  };
+}