add path api to CLI

lib/api/index.js

@@ -0,0 +1,16 @@
+const functions = {
+  setup: require('./setup.js'),
+}
+
+module.exports = async (argv) => {
+  try {
+    if (argv._.length === 1) throw new Error('No operation specified')
+    const operation = argv._[1]
+    if (!functions[operation]) throw new Error(`Unknown operation: ${operation}`)
+
+    await functions[operation](argv)
+  } catch (e) {
+    console.error(e.message || e)
+    process.exit(1)
+  }
+}