Initial commit

packager/parseCommandLine.js

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+/**
+ * Copyright 2004-present Facebook. All Rights Reserved.
+ *
+ * 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) {
+  // 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) {
+    optimist
+      .boolean(config[i].command)
+      .default(config[i].command, config[i].default)
+      .describe(config[i].command, config[i].description);
+  }
+  var argv = optimist.argv;
+
+  // 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;
+    }
+  }
+
+  // Show --help
+  if (argv.help || argv.h) {
+    optimist.showHelp();
+    process.exit();
+  }
+
+  return argv;
+}
+
+module.exports = parseCommandLine;