luke-j/switch

/**
 * @license
 *
 * Copyright 2016- Luke Jones (https://github.com/luke-j)
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

import To from './commands/To';
import SpiderMonkey from './SpiderMonkey';

export default class Switch {

    /**
     * Parse the CLI arguments and run the Switch process
     *
     * @constructor Switch
     */
    constructor() {
    }

    /**
     * Parse the CLI arguments and run the command specified by the --command parameter
     *
     * @param {Array} scriptArgs - The CLI passed to the JS shell
     */
    static main(scriptArgs = []) {
        const args = {};
        for (let x = 0, length = scriptArgs.length; x < length; x += 2) {
            args[scriptArgs[x].replace(/^\-{2}/, '')] = scriptArgs[x + 1];
        }

        if (!args.command) {
            SpiderMonkey.print('You must specify a "--command" option');
            SpiderMonkey.quit(1);
        }

        switch (args.command) {
            case 'to':
                if (!args.to) {
                    SpiderMonkey.print('You must specify a "--to" option');
                    SpiderMonkey.quit(1);
                } else if (!args.config) {
                    SpiderMonkey.print('You must specify a "--config" option');
                    SpiderMonkey.quit(1);
                }
                // SWITCH_SOURCE refers to the Switch source directory
                const run = new To(args.to, SpiderMonkey.read(args.config), SpiderMonkey.environment()['SWITCH_SOURCE']).generate();
                SpiderMonkey.print(run);
                SpiderMonkey.quit();
                break;
            default:
                SpiderMonkey.print('Invalid command');
                SpiderMonkey.quit(1);
                break;
        }
    }
}

// only execute main() if in the SpiderMonkey environment, version is a SpiderMonkey global function
typeof version === 'function' && Switch.main(SpiderMonkey.scriptArgs());