CleverStack/node-seed

var path            = require('path')
  , fs              = require('fs')
  , packageJson     = require(__dirname + '/package.json')
  , merge           = require('deepmerge')
  , config          = require(path.join(__dirname, 'config'))
  , utils           = require(path.join(__dirname, 'lib', 'utils'))
  , helpers         = utils.helpers
  , registerFuncs   = []
  , gruntConfig     = {};

// Clean and set the NODE_PATH for magic modules
process.env.NODE_PATH = helpers.nodePath();

/**
 * Helper function to load grunt task configuration objects and register tasks
 * @param  {String} taskNames the names of the tasks you want to load
 */
function loadGruntConfigs(taskNames, rootPath) {
  rootPath = rootPath || __dirname;

  taskNames.forEach(function(taskName) {
    var gruntTask   = require(path.resolve(path.join(rootPath, 'tasks', 'grunt', taskName)))
      , hasRegister = gruntTask.config && gruntTask.register
      , taskConfig  = {};

    // Extend the main grunt config with this tasks config
    taskConfig[taskName.replace('.js', '')] = !!hasRegister ? gruntTask.config : gruntTask;
    gruntConfig          = merge(gruntConfig, taskConfig);

    // Allow registration of grunt tasks
    if (!!hasRegister) {
      registerFuncs.push(gruntTask.register);
    }
  });
}

module.exports = function(grunt) {
  // load all grunt tasks
  require('matchdep').filterDev('grunt-*').forEach(grunt.loadNpmTasks);

  // Load the grunt task config files
  loadGruntConfigs(helpers.getFilesForFolder(path.resolve(path.join(__dirname, 'tasks', 'grunt'))));

  // Load all modules Gruntfiles.js
  utils.getModulePaths().forEach(function(modulePath) {

    // Allow modules to use new style of task loading/registering
    loadGruntConfigs(helpers.getFilesForFolder(path.join(__dirname, modulePath, 'tasks', 'grunt')), path.join(__dirname, modulePath));

    // Support the modules having their own Gruntfile.js
    var moduleGruntfile = [__dirname, modulePath, 'Gruntfile.js'].join(path.sep);
    if (fs.existsSync(moduleGruntfile)) {
      var gruntfile = require(moduleGruntfile)(grunt);

      // Merge (deep) the grunt config objects
      gruntConfig = merge(gruntConfig, gruntfile[0]);

      // Add the register function to our callbacks
      registerFuncs.push(gruntfile[1]);
    }
  });

  // Initialize the config
  grunt.initConfig(gruntConfig);

  // Fire the callbacks and allow the modules to register their tasks
  registerFuncs.forEach(function(registerTasks) {
    registerTasks(grunt);
  });
};