1 files changed, 75 insertions, 0 deletions
diff --git a/scripts/docs/preview.mjs b/scripts/docs/preview.mjs
new file mode 100644
index 00000000..9ef85728
--- /dev/null
+++ b/scripts/docs/preview.mjs
@@ -0,0 +1,75 @@
+import { readFile } from 'node:fs/promises';
+import { dirname, resolve } from 'node:path';
+import { fileURLToPath, pathToFileURL } from 'node:url';
+import {
+  compareGitTree,
+  createGit,
+  extractGitTree,
+  gitPathExists,
+  resolveCommit,
+} from './snapshot.mjs';
+
+const scriptDir = dirname(fileURLToPath(import.meta.url));
+const repoRoot = process.env.HERDR_DOCS_REPO_ROOT
+  ? resolve(process.env.HERDR_DOCS_REPO_ROOT)
+  : resolve(scriptDir, '../..');
+const git = createGit(repoRoot);
+const sourceRoot = 'docs/next/website';
+const snapshotRoot = resolve(repoRoot, 'docs/preview/website');
+const manifestPath = resolve(repoRoot, 'distribution/preview.json');
+const fullShaPattern = /^[0-9a-f]{40}$/;
+
+export async function snapshotPreview(ref) {
+  const commit = resolveCommit(git, ref);
+  if (!gitPathExists(git, commit, `${sourceRoot}/src/content/docs`)) {
+    throw new Error(`${commit} does not contain staged website documentation`);
+  }
+  if (!gitPathExists(git, commit, `${sourceRoot}/src/data/config-reference.json`)) {
+    throw new Error(`${commit} does not contain the staged config reference`);
+  }
+  await extractGitTree(git, commit, sourceRoot, snapshotRoot);
+  process.stdout.write(`snapshotted preview documentation from ${commit}\n`);
+}
+
+export async function checkPreview() {
+  const manifest = JSON.parse(await readFile(manifestPath, 'utf8'));
+  if (manifest.schema_version !== 1 || manifest.channel !== 'preview') {
+    throw new Error(`${manifestPath} has an unsupported schema`);
+  }
+  if (typeof manifest.commit !== 'string' || !fullShaPattern.test(manifest.commit)) {
+    throw new Error(`${manifestPath} must contain a full preview commit SHA`);
+  }
+  const build = manifest.builds?.[manifest.build_id];
+  if (!build || build.commit !== manifest.commit) {
+    throw new Error(`${manifestPath} active build does not match its preview commit`);
+  }
+  const expectedTag = `preview-${manifest.build_id}`;
+  if (build.tag !== expectedTag) {
+    throw new Error(`${manifestPath} active build tag does not match ${expectedTag}`);
+  }
+  if (!gitPathExists(git, manifest.commit, `${sourceRoot}/src/content/docs`)) {
+    throw new Error(`${manifest.commit} does not contain staged website documentation`);
+  }
+  if (!gitPathExists(git, manifest.commit, `${sourceRoot}/src/data/config-reference.json`)) {
+    throw new Error(`${manifest.commit} does not contain the staged config reference`);
+  }
+  await compareGitTree(git, manifest.commit, sourceRoot, snapshotRoot);
+  process.stdout.write(`validated preview documentation snapshot ${manifest.commit}\n`);
+}
+
+async function main() {
+  const [command, value] = process.argv.slice(2);
+  if (command === 'snapshot' && value) {
+    await snapshotPreview(value);
+    return;
+  }
+  if (command === 'check' && !value) {
+    await checkPreview();
+    return;
+  }
+  throw new Error('usage: node scripts/docs/preview.mjs check | snapshot <commit>');
+}
+
+if (process.argv[1] && import.meta.url === pathToFileURL(process.argv[1]).href) {
+  await main();
+}