functions.php

<?php
/**
 * Roots functions
 */

if (!defined('__DIR__')) { define('__DIR__', dirname(__FILE__)); }

require_once locate_template('/lib/utils.php');           // Utility functions
require_once locate_template('/lib/config.php');          // Configuration and constants
require_once locate_template('/lib/activation.php');      // Theme activation
require_once locate_template('/lib/cleanup.php');         // Cleanup
require_once locate_template('/lib/htaccess.php');        // Rewrites for assets, H5BP .htaccess
require_once locate_template('/lib/widgets.php');         // Sidebars and widgets
require_once locate_template('/lib/template-tags.php');   // Template tags
require_once locate_template('/lib/actions.php');         // Actions
require_once locate_template('/lib/scripts.php');         // Scripts and stylesheets
require_once locate_template('/lib/post-types.php');      // Custom post types
require_once locate_template('/lib/metaboxes.php');       // Custom metaboxes
require_once locate_template('/lib/custom.php');          // Custom functions

function roots_setup() {

  // Make theme available for translation
  load_theme_textdomain('roots', get_template_directory() . '/lang');

  // Register wp_nav_menu() menus (http://codex.wordpress.org/Function_Reference/register_nav_menus)
  register_nav_menus(array(
    'primary_navigation' => __('Primary Navigation', 'roots'),
  ));

  // Add post thumbnails (http://codex.wordpress.org/Post_Thumbnails)
  add_theme_support('post-thumbnails');
  // set_post_thumbnail_size(150, 150, false);
  // add_image_size('category-thumb', 300, 9999); // 300px wide (and unlimited height)

  // Add post formats (http://codex.wordpress.org/Post_Formats)
  // add_theme_support('post-formats', array('aside', 'gallery', 'link', 'image', 'quote', 'status', 'video', 'audio', 'chat'));

  // Tell the TinyMCE editor to use a custom stylesheet
  add_editor_style('assets/css/editor-style.css');

}

add_action('after_setup_theme', 'roots_setup');