dae-mockcli/lib/exec.js

mock系统脚手架

const childProcess = require('child_process');
const which = require('which');
const chalk = require('chalk');

/**
 * 查找系统中用于安装依赖包的命令
 */
function findNpm() {
  const npms = ['tnpm', 'cnpm', 'npm'];
  for (let i = 0; i < npms.length; i++) {
    try {
      // 查找环境变量下指定的可执行文件的第一个实例
      which.sync(npms[i]);
      return npms[i]
    } catch (e) {
    }
  }
  throw new Error(chalk.red('请安装npm'));
}
/**
 * 查找是否有弄得环境
 */
function findEnv(env) {
  try {
    which.sync(env);
    return env
  } catch (e) {

  }
  throw new Error(chalk.red(`请安装${env}`));
}

/**
 * 开启子进程来执行命令
 * @param {String} cmd 待执行的命令 
 * @param {Array} args 命令执行时的参数.
 * @param {Function} fn 执行完成时的回调.
 */
function exec(cmd, args, fn) {
  args = args || [];
  const runner = childProcess.spawn(cmd, args, {
    stdio: 'inherit'
  });

  runner.on('close', function (code) {
    if (fn) {
      fn(code);
    }
  })
}

module.exports = {
  exec,
  findNpm,
  findEnv
};