77 lines
2.2 KiB
JavaScript
77 lines
2.2 KiB
JavaScript
/**
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* Copyright (c) 2015-present, Facebook, Inc.
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* All rights reserved.
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*
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* This source code is licensed under the BSD-style license found in the
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* LICENSE file in the root directory of this source tree. An additional grant
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* of patent rights can be found in the PATENTS file in the same directory.
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*
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* Wrapper on-top of `optimist` in order to properly support boolean flags
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* and have a slightly less akward API.
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*
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* Usage example:
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* var argv = parseCommandLine([{
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* command: 'web',
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* description: 'Run in a web browser instead of iOS',
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* default: true
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* }])
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*/
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'use strict';
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var optimist = require('optimist');
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function parseCommandLine(config, args) {
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args = args || process.argv;
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// optimist default API requires you to write the command name three time
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// This is a small wrapper to accept an object instead
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for (var i = 0; i < config.length; ++i) {
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if (config[i].type === 'string') {
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optimist.string(config[i].command);
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} else {
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optimist.boolean(config[i].command);
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}
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optimist
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.default(config[i].command, config[i].default)
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.describe(config[i].command, config[i].description);
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if (config[i].required) {
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optimist.demand(config[i].command);
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}
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}
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var argv = optimist.parse(args);
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// optimist doesn't have support for --dev=false, instead it returns 'false'
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for (var i = 0; i < config.length; ++i) {
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var command = config[i].command;
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if (argv[command] === undefined) {
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argv[command] = config[i].default;
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}
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if (argv[command] === 'true') {
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argv[command] = true;
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}
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if (argv[command] === 'false') {
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argv[command] = false;
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}
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if (config[i].type === 'string') {
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// According to https://github.com/substack/node-optimist#numbers,
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// every argument that looks like a number should be converted to one.
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var strValue = argv[command];
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var numValue = strValue ? Number(strValue) : undefined;
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if (typeof numValue === 'number' && !isNaN(numValue)) {
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argv[command] = numValue;
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}
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}
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}
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// Show --help
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if (argv.help || argv.h) {
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optimist.showHelp();
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process.exit();
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}
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return argv;
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}
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module.exports = parseCommandLine;
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