grunt-pretasks/index.js

Pre tasks for Grunt

'use strict';

module.exports = function (grunt) {

  function queuePreTasks(things) {
    things.forEach(function (thing) {
      var taskConfig = grunt.config()[thing.task.name];
      if (!taskConfig || !taskConfig.options)
        return;

      var taskOptions = taskConfig.options;
      if ('preTasks' in taskOptions) {
        var preTasks = taskOptions.preTasks;
        grunt.task.run(preTasks);
      }
    });
  }

  // overrides Task.prototype.run so we can queue options.preTasks
  grunt.util.task.Task.prototype.run = function () {
    // Parse arguments into an array, returning an array of task+args objects.
    var things = this.parseArgs(arguments).map(this._taskPlusArgs, this);
    // Throw an exception if any tasks weren't found.
    var fails = things.filter(function (thing) { return !thing.task; });
    if (fails.length > 0) {
      this._throwIfRunning(new Error('Task "' + fails[0].nameArgs + '" not found.'));
      return this;
    }
    // Append pre things to queue
    queuePreTasks(things);
    // Append things to queue in the correct spot.
    this._push(things);
    // Make chainable!
    return this;
  }

};