Gruntfile.js

module.exports = function(grunt) {

  require('matchdep').filterDev('grunt-*').forEach(grunt.loadNpmTasks);

  var env = process.env.NODE_ENV || 'dev';
  var _ = require('lodash');

  /*** External config & tasks filepaths ***/

  //we have 1 base config, and possibly many module-specific config
  var configLocations = [
    './grunt-config/base_config.js',
    './grunt-config/**/config.js',
    './grunt-config/**/*-config.js'
  ];

  //we have 1 base tasks definition, and possibly many module-specific config
  var tasksLocations = [
    './grunt-config/base_tasks.js',
    './grunt-config/**/tasks.js',
    './grunt-config/**/*-tasks.js'
  ];


  /***************** External configuration management ***********************************/

  var configFiles = grunt.file.expand({
    filter: "isFile"
  }, configLocations );

  grunt.verbose.writeln('Gathering external configuration files'.underline.green);
  grunt.verbose.writeln("configFiles : " + grunt.log.wordlist(configFiles, {
    separator: ', ',
    color: 'cyan'
  }));

  var configArray = configFiles.map(function(file) {
    grunt.verbose.writeln("=> importing : " + file);
    return require(file)(grunt, env);
  });

  var config = {};

  configArray.forEach(function(element) {
    config = _.merge(config, element);
  });

  grunt.verbose.subhead('* Generated config file: *');
  grunt.verbose.writeln(JSON.stringify(config, undefined, 2));

  grunt.initConfig(config);

  /** Task loading & registering **/
  // We load grunt tasks listed in package.json file
  require('load-grunt-tasks')(grunt);

  /** External tasks registering **/
  
  grunt.verbose.writeln('Gathering external task files'.underline.green);

  var taskFiles = grunt.file.expand({
    filter: "isFile"
  }, tasksLocations);

  grunt.verbose.writeln("task files : " + grunt.log.wordlist(taskFiles, {
    separator: ', ',
    color: 'cyan'
  }));

  taskFiles.forEach(function(path) {
    grunt.verbose.writeln("=> loading & registering : " + path);
    require(path)(grunt);
  });


  //write the generated configuration (for debug)
  grunt.registerTask('logConfig', 'Output the generated configuration object', function() {
    grunt.log.subhead('* Generated config file: *');
    grunt.log.writeln(JSON.stringify(config, undefined, 2));
  });


};