feat: make each plugin an npm workspace built by a termix-plugin CLI

packages/plugin-sdk/cli/commands/validate.mjs

@@ -0,0 +1,44 @@
+import fs from "node:fs";
+import path from "node:path";
+import { fileURLToPath } from "node:url";
+import { readManifest } from "../lib/plugin-dir.mjs";
+
+/**
+ * The manifest rules live in src/manifest.ts, which the server uses too, so
+ * there is one implementation rather than a copy here that drifts.
+ */
+async function loadParseManifest() {
+  const entry = new URL("../../dist/manifest.js", import.meta.url);
+  if (!fs.existsSync(fileURLToPath(entry))) {
+    throw new Error("The plugin SDK is not built yet. Run: npm run build:sdk");
+  }
+  const mod = await import(entry.href);
+  return mod.parseManifest;
+}
+
+export async function validate({ cwd }) {
+  const raw = readManifest(cwd);
+  const parseManifest = await loadParseManifest();
+  const { errors } = parseManifest(raw);
+
+  const problems = [...errors];
+
+  // The manifest names files. They have to be there.
+  const referenced = [
+    raw.backend ?? "dist/backend.js",
+    raw.frontend ?? "dist/frontend.js",
+    raw.locales ?? "locales",
+  ];
+  for (const rel of referenced) {
+    if (!fs.existsSync(path.join(cwd, rel))) {
+      problems.push(`manifest references ${rel}, which does not exist`);
+    }
+  }
+
+  if (problems.length > 0) {
+    for (const problem of problems) console.error(`  ${problem}`);
+    throw new Error(`${raw.id ?? path.basename(cwd)}: manifest is not valid.`);
+  }
+
+  console.log(`ok  ${raw.id ?? path.basename(cwd)}`);
+}