'use strict';

var log = require('fancy-log');
var exec = require('child_process').exec;

module.exports = function (url, name, opt, cb) {
  if (!cb || typeof cb !== 'function') cb = function () {};
  if (!url) return cb(new Error('gulp-git: Repo URL is required git.submodule.add("https://github.com/user/repo.git", "repoName")'));
  if (!name) name = '';
  if (!opt) opt = {};
  if (!opt.cwd) opt.cwd = process.cwd();
  if (!opt.args) opt.args = '';

  var maxBuffer = opt.maxBuffer || 200 * 1024;

  var cmd = 'git submodule add ' + opt.args + ' ' + url + ' ' + name;
  return exec(cmd, {cwd: opt.cwd, maxBuffer: maxBuffer}, function(err, stdout, stderr) {
    if (err && cb) return cb(err);
    if (!opt.quiet) log(stdout, stderr);
    if (cb) cb();
  });
};