1 files changed, 103 insertions, 0 deletions
diff --git a/website/src/site-data.ts b/website/src/site-data.ts
new file mode 100644
index 00000000..94836fe7
--- /dev/null
+++ b/website/src/site-data.ts
@@ -0,0 +1,103 @@
+import { readdir, readFile } from 'node:fs/promises';
+import { resolve } from 'node:path';
+
+/* The numbers the site's chrome shows, resolved once per build.
+   Stars, installs and plugin counts come from the same R2 snapshots /stats/
+   and /plugins/ read; the version comes from latest.json, which release CI
+   owns. Nothing here is hand-maintained, so no figure on the site can go
+   stale independently of a deploy.
+
+   Memoised because SiteLayout renders on every blog post, and a build that
+   renders many pages should still fetch once. */
+
+export type SiteStats = {
+  starCount?: number;
+  installCount?: number;
+  pluginCount?: number;
+};
+
+async function snapshot(url: string): Promise<any | null> {
+  try {
+    const res = await fetch(url);
+    return res.ok ? await res.json() : null;
+  } catch {
+    return null;
+  }
+}
+
+async function load(): Promise<SiteStats> {
+  const [stats, plugins] = await Promise.all([
+    snapshot('https://assets.herdr.dev/stats/stats.json'),
+    snapshot('https://assets.herdr.dev/plugins/index.json'),
+  ]);
+
+  return {
+    starCount: stats?.stars?.total,
+    installCount: stats?.downloads
+      ? (stats.downloads.github || 0) + (stats.downloads.brew || 0)
+      : undefined,
+    /* `pluginCount` counts validated manifests, which is what the marketplace
+       lists. `source.totalCount` is the raw GitHub topic search and still
+       includes blacklisted repositories and ones with no manifest. */
+    pluginCount: plugins?.pluginCount ?? plugins?.plugins?.length,
+  };
+}
+
+let statsPromise: Promise<SiteStats> | null = null;
+
+export function siteStats(): Promise<SiteStats> {
+  statsPromise ??= load();
+  return statsPromise;
+}
+
+/* latest.json carries the full release notes, so read and pick rather than
+   importing it and bundling all of that into the page. */
+async function readVersion(): Promise<string | null> {
+  try {
+    const raw = await readFile(new URL('../latest.json', import.meta.url), 'utf8');
+    return JSON.parse(raw).version ?? null;
+  } catch {
+    return null;
+  }
+}
+
+let versionPromise: Promise<string | null> | null = null;
+
+export function releaseVersion(): Promise<string | null> {
+  versionPromise ??= readVersion();
+  return versionPromise;
+}
+
+/* How many agents Herdr detects out of the box, counted from the bundled
+   manifests. The site is built from the same repo as the binary, so the number
+   tracks the code and cannot drift the way a written-down one would — add a
+   manifest and the homepage says so on the next deploy. */
+async function countAgentManifests(): Promise<number | null> {
+  /* Resolved from cwd, not import.meta.url: once Vite bundles this module for
+     the build the module URL no longer points at the source file, so a
+     relative URL silently found nothing and the line vanished from dist while
+     still rendering in dev. Both candidates cover running the build from
+     website/ or from the repo root. */
+  for (const rel of ['../src/detect/manifests', 'src/detect/manifests']) {
+    try {
+      const files = await readdir(resolve(process.cwd(), rel));
+      const count = files.filter((f) => f.endsWith('.toml')).length;
+      if (count > 0) return count;
+    } catch {
+      /* try the next candidate */
+    }
+  }
+  return null;
+}
+
+let agentCountPromise: Promise<number | null> | null = null;
+
+export function agentCount(): Promise<number | null> {
+  agentCountPromise ??= countAgentManifests();
+  return agentCountPromise;
+}
+
+/* A fetch that failed at build shows an em dash. A stale hardcoded number
+   would look authoritative and be wrong, which is worse. */
+export const fmt = (n: unknown): string =>
+  typeof n === 'number' ? n.toLocaleString('en-US') : '—';