Move files from packager/ to local-cli

Summary: public

This is not only to put the files on a place where it makes more sense but also to allow to use ES6 features on them as `/packager` is not whitelisted on `babel`.

Reviewed By: mkonicek

Differential Revision: D2577267

fb-gh-sync-id: b69a17c0aad349a3eda987e33d1778d97a8e1549

local-cli/util/parseCommandLine.js

@@ -0,0 +1,76 @@
+/**
+ * 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.
+ *
+ * Wrapper on-top of `optimist` in order to properly support boolean flags
+ * and have a slightly less akward API.
+ *
+ * Usage example:
+ *   var argv = parseCommandLine([{
+ *     command: 'web',
+ *     description: 'Run in a web browser instead of iOS',
+ *     default: true
+ *   }])
+ */
+'use strict';
+
+var optimist = require('optimist');
+
+function parseCommandLine(config, args) {
+  args = args || process.argv;
+  // optimist default API requires you to write the command name three time
+  // This is a small wrapper to accept an object instead
+  for (var i = 0; i < config.length; ++i) {
+    if (config[i].type === 'string') {
+      optimist.string(config[i].command);
+    } else {
+      optimist.boolean(config[i].command);
+    }
+
+    optimist
+      .default(config[i].command, config[i].default)
+      .describe(config[i].command, config[i].description);
+
+    if (config[i].required) {
+      optimist.demand(config[i].command);
+    }
+  }
+  var argv = optimist.parse(args);
+
+  // optimist doesn't have support for --dev=false, instead it returns 'false'
+  for (var i = 0; i < config.length; ++i) {
+    var command = config[i].command;
+    if (argv[command] === undefined) {
+      argv[command] = config[i].default;
+    }
+    if (argv[command] === 'true') {
+      argv[command] = true;
+    }
+    if (argv[command] === 'false') {
+      argv[command] = false;
+    }
+    if (config[i].type === 'string') {
+      // According to https://github.com/substack/node-optimist#numbers,
+      // every argument that looks like a number should be converted to one.
+      var strValue = argv[command];
+      var numValue = strValue ? Number(strValue) : undefined;
+      if (typeof numValue === 'number' && !isNaN(numValue)) {
+        argv[command] = numValue;
+      }
+    }
+  }
+
+  // Show --help
+  if (argv.help || argv.h) {
+    optimist.showHelp();
+    process.exit();
+  }
+
+  return argv;
+}
+
+module.exports = parseCommandLine;