Gruntjs 如何动态构建监视任务&x27；谁的目标？

使用

gurunt syncall

，我想将项目根目录中的每个目录（以及在将来创建的新目录）动态同步到另一个目录，除了“node\u modules”目录

使用

grunt watchall

，我想查看那些dir，当dir中有一些更改时，我想自动运行相应的同步任务

以下是我的项目根目录的结构：

├── Gruntfile.js
├── addon1
│   └── a.toc
├── adon3
│   └── 3.toc
├── node_modules
│   ├── grunt
│   ├── grunt-contrib-watch
│   └── grunt-sync
└── package.json

grunt syncall

命令正常，结果如下：

➜  testsync  grunt syncall 
Running "config" task

Running "sync:addon1" (sync) task

Running "sync:adon3" (sync) task

Done, without errors.

但是

grunt watchall

不正常你能告诉我为什么

watchall

任务不起作用以及如何修复它吗？

我启动命令，将文件'3.toc'更改并保存在dir'adon3'中，然后grunt说：

➜  testsync  grunt watchall
Running "config" task

Running "watch" task
Waiting...
>> File "adon3/3.toc" changed.
Running "sync:adon3" (sync) task
Verifying property sync.adon3 exists in config...ERROR
>> Unable to process task.
Warning: Required config property "sync.adon3" missing. Use --force to continue.

Aborted due to warnings.

这是我的Grunfile.js：

module.exports = function(grunt) {

  grunt.initConfig({});

  var destdir = "/Users/morrxy/project/testdest/";

  // dynamic config sync and watch's targets for every dir except for node_modules
  grunt.registerTask('config', 'config sync and watch', function() {

    grunt.file.expand({filter: 'isDirectory'},
      ['*', '!node_modules']).forEach(function(dir) {

      // config sync's targets
      var sync = grunt.config.get('sync') || {};
      sync[dir] = {
        files: [{
          cwd: dir,
          src: '**',
          dest: destdir + dir
        }]
      };
      grunt.config.set('sync', sync);

      // config watch's target
      var watch = grunt.config.get('watch') || {};
      watch[dir] = {
        files: dir + '/**/*',

        // is next line has problem?

        // running 'grunt watchall'
        // when I change and save the file '3.toc' in dir 'adon3', terminal say:

        // >> File "adon3/3.toc" changed.
        // Running "sync:adon3" (sync) task
        // Verifying property sync.adon3 exists in config...ERROR
        // >> Unable to process task.
        // Warning: Required config property "sync.adon3" missing.

        // but why 'grunt syncall' can work?
        tasks: 'sync:' + dir
      };
      grunt.config.set('watch', watch);

    });

  });

  grunt.loadNpmTasks('grunt-sync');
  grunt.loadNpmTasks('grunt-contrib-watch');

  grunt.registerTask('syncall', ['config', 'sync']);
  grunt.registerTask('watchall', ['config', 'watch']);

};

---

最后，我解决了这个问题。我为这个问题添加了一个github回购协议。如果您想要测试，您可以克隆它并在本地运行它

之所以

watchall

可以监视文件更改，但无法运行相应的同步任务，是因为当watch find files更改时，每个同步的配置都会停止运行，因此该同步目标的配置将消失，我们没有将运行的配置保存在任何位置。因此，为了解决这个问题，我们可以在同步任务之前将config任务添加到watch任务中，如下面的

tasks:['config\u sync'，'sync:'+dir]

在新的Gruntfile.js中，我使用配置同步任务将配置任务拆分为两个任务，一个用于配置监视，一个用于配置同步。这是新的Gruntfile.js

module.exports = function(grunt) {

  var destdir = "/media/data/projects/dynasync_dest/";

  grunt.loadNpmTasks('grunt-sync');
  grunt.loadNpmTasks('grunt-contrib-watch');

  // dynamic config sync's targets for every dir except for node_modules
  grunt.registerTask('config_sync', 'dynamically config sync', function() {

    grunt.file.expand({filter: 'isDirectory'},
      ['*', '!node_modules']).forEach(function(dir) {

      // config this dir's sync target
      var sync = grunt.config.get('sync') || {};
      sync[dir] = {
        files: [{
          cwd: dir,
          src: '**/*',
          dest: destdir + dir
        }]
      };
      grunt.config.set('sync', sync);

    });

  });

  // dynamic config watch's targets for every dir except for node_modules
  grunt.registerTask('config_watch', 'dynamically config watch', function() {

    grunt.file.expand({filter: 'isDirectory'},
      ['*', '!node_modules']).forEach(function(dir) {

      // config this dir's watch target
      var watch = grunt.config.get('watch') || {};
      watch[dir] = {
        files: dir + '/**/*',
        // this line solve the problem
        // when find file change, first dynamically config sync and then sync the dir
        tasks: ['config_sync', 'sync:' + dir]
      };
      grunt.config.set('watch', watch);

    });

  });

  grunt.registerTask('syncall', ['config_sync', 'sync']);
  grunt.registerTask('watchall', ['config_watch', 'watch']);
  grunt.registerTask('default', ['watchall']);

};

这一次，当watch find文件发生更改时，它可以运行相应的同步任务。像这样

grunt watchall
Running "config_watch" task

Running "watch" task
Waiting...
>> File "adon3/3.toc" changed.
Running "config_sync" task

Running "sync:adon3" (sync) task

Done, without errors.
Completed in 0.888s at Thu Apr 10 2014 14:01:26 GMT+0800 (CST) - Waiting...