grunt-subgrunt/tasks/subgrunt.js

Run sub-projects' grunt tasks.

'use strict'

var async = require('async')
var glob = require('glob')

module.exports = function (grunt) {
  var runNpmInstall = function (path, options, next) {
    grunt.util.spawn({
      cmd: options.npmPath,
      args: ['install'],
      opts: {cwd: path, stdio: 'inherit'}
    }, function (err, result, code) {
      if (err || code > 0) {
        grunt.fail.warn('Failed installing node modules in "' + path + '".')
      } else {
        grunt.log.ok('Installed node modules in "' + path + '".')
      }

      next()
    })
  }

  var runNpmClean = function (path, options, next) {
    // Requires npm >= 1.3.10!

    grunt.util.spawn({
      cmd: options.npmPath,
      args: ['prune', '--production'],
      opts: {cwd: path, stdio: 'inherit'}
    }, function (err, result, code) {
      if (err || code > 0) {
        grunt.fail.warn('Failed cleaning development dependencies in "' + path + '".')
      } else {
        grunt.log.ok('Cleaned development dependencies in "' + path + '".')
      }

      next()
    })
  }

  var runGruntTasks = function (path, tasks, options, next) {
    var args = options.passGruntFlags ? tasks.concat(grunt.option.flags()) : tasks

    // Removes --gruntfile arg # fixes issue #13
    for (var i = 0; i < args.length; i++) {
      var arg = args[i]
      if (arg.indexOf('--gruntfile') > -1) {
        args = args.slice(0, i).concat(args.slice(i + 1))
        break
      }
    }

    grunt.util.spawn({
      grunt: true,
      args: args,
      opts: {cwd: path, stdio: 'inherit'}
    }, function (err, result, code) {
      if (err || code > 0) {
        grunt.fail.warn('Failed running "grunt ' + args.join(' ') + '" in "' + path + '".')
      } else {
        grunt.log.ok('Ran "grunt ' + args.join(' ') + '" in "' + path + '".')
      }

      next()
    })
  }

  grunt.registerMultiTask('subgrunt', 'Run sub-projects\' grunt tasks.', function () {
    var cb = this.async()
    var options = this.options({
      npmInstall: true,
      npmClean: false,
      npmPath: 'npm',
      passGruntFlags: true,
      limit: Math.max(require('os').cpus().length, 2)
    })

    var projects = this.data.projects || this.data

    if (projects instanceof Array) {
      var res = {}
      projects.forEach(function (el) {
        res[el] = 'default'
      })
      projects = res
    }

    async.eachLimit(Object.keys(projects), options.limit, function (path, next) {
      var tasks = projects[path]
      if (!(tasks instanceof Array)) {
        tasks = [tasks]
      }

      glob('Gruntfile.{js,coffee}', {
        nocase: true,
        cwd: path
      }, function (err, files) {
        if (err || !files.length) {
          grunt.fail.warn('The "' + path + '" directory is not valid, or does not contain a Gruntfile.')
          return next()
        }

        if (options.npmInstall) {
          runNpmInstall(path, options, function () {
            runGruntTasks(path, tasks, options, options.npmClean ? function () {
              runNpmClean(path, options, next)
            } : next)
          })
        } else {
          runGruntTasks(path, tasks, options, next)
        }
      })
    }, cb)
  })
}