Introduce react native CLI

Reviewed By: @frantic

Differential Revision: D2430522

private-cli/src/cli.js

@@ -0,0 +1,62 @@
+/**
+ * Copyright (c) 2015-present, Facebook, Inc.
+ * All rights reserved.
+ *
+ * This source code is licensed under the BSD-style license found in the
+ * LICENSE file in the root directory of this source tree. An additional grant
+ * of patent rights can be found in the PATENTS file in the same directory.
+ */
+'use strict';
+
+const Config = require('./util/Config');
+const dependencies = require('./dependencies/dependencies');
+const Promise = require('promise');
+
+const documentedCommands = {
+  dependencies: dependencies,
+};
+
+const hiddenCommands = {
+  '-h': help,
+  '--help': help,
+};
+
+/**
+ * Programmatic entry point for the cli. This function runs the given
+ * command passing it the arguments array.
+ */
+function run(command, commandArgs) {
+  if (!command) {
+    throw new Error(helpMessage());
+  }
+  commandArgs = commandArgs || [];
+
+  const commandToExec = documentedCommands[command] || hiddenCommands[command];
+  if (!commandToExec) {
+    throw new Error(helpMessage(command));
+  }
+
+  commandToExec(commandArgs, Config.get()).done();
+}
+
+function helpMessage(command) {
+  const validCommands = Object
+    .keys(documentedCommands)
+    .map(c => '"' + c + '"')
+    .join(' | ');
+
+  if (command) {
+    return 'Unknown command "' + command + '". ' +
+      'Available commands: ' + validCommands;
+  } else {
+    return 'Must specify a command. Available commands: ' +
+      validCommands;
+  }
+}
+
+function help() {
+  console.log(helpMessage());
+  return Promise.resolve();
+}
+
+module.exports.run = run;