commandReaderJson.js

/**
 * @author Hryhorii Furletov <littlefuntik@gmail.com>
 * 
 * @example
 * (new CommandReader).runYii('config/database').then((databaseConfig) => {  });
 * (new CommandReader).runYii('/usr/bin/php', 'configJson.php').then((databaseConfig) => {  });
 */
'use strict'

const spawn = require('child_process').spawn;
const yiiCommandPath = __dirname + '/../yii';

class CommandReader {

  run() {
    if (!arguments.length) {
      throw 'First argument required';
    }

    let command = arguments[0];
    let args = [];

    for(var i = 1, l = arguments.length; i < l; ++i) {
      args.push(arguments[i]);
    }

    return (new Promise((resolve, reject) => {

      const execCommand = spawn(command, args);

      execCommand.stdout.on('data', (data) => {
        resolve(data.toString());
      });

      execCommand.stderr.on('data', (data) => {
        reject(data.toString());
      });

    })).then((responseText) => {

      try {
        var config = JSON.parse(responseText);
      } catch (e) {
        throw "Bad JSON syntax in response. Detail message: " + e.message;
      }

      return config;
    });
  }

  runYii() {
    let args = [yiiCommandPath];

    for(var i = 0, l = arguments.length; i < l; ++i) {
      args.push(arguments[i]);
    }

    return this.run.apply(this, args);
  }

};

module.exports = {
  'commandReader': CommandReader
};