Programmatically pass arguments to grunt task?

Question

I have a grunt task that calls other grunt tasks. I want to call a subtask with programmatically determined arguments. Is this possible? I spent some time digging around the lib/grunt.js and lib/grunt/task.js, but couldn't figure it out.

I'm using grunt-compass with the following arguments specified in Gruntfile.js:

compass: {
  default_options: {
    src: 'components/201',
    dest: 'build',
    require: ['zurb-foundation']
  }
}

I want to be able to override them at runtime:

tasks/my-task.js:

// simplified example
module.exports = function(grunt) {
  grunt.registerTask('foo', 'bar', function() {
    var chooseDest = doWork();
    grunt.task.run('compass', {src: 'src', dest: chooseDest});
  });
};

For reference:

$ grunt --version
grunt-cli v0.1.6
grunt v0.4.0rc6

Answer 1

I figured it out. Use the <%= %> syntax in Gruntfile.js:

compass: {   default_options: {     src: 'components/<%= myTask.src %>',     dest: 'build',     require: ['zurb-foundation']   } } 

Then you can set it in your task:

grunt.config.set('myTask.src', getSrc()); 

Answer 2

You can edit all the Grunt config:

grunt.config('compass.default_options.src', 'blabla'); 

Just before run the task. But your solution is "cleaner".