source: lightning/3.0.2/functions.php

<?php
$theme_opt = wp_get_theme(get_template());
define('LIGHTNING_THEME_VERSION', $theme_opt->Version);
/*-------------------------------------------*/
/*      Theme setup
/*-------------------------------------------*/
/*      Load JS
/*-------------------------------------------*/
/*      Load CSS
/*-------------------------------------------*/
/*-------------------------------------------*/
/*      WidgetArea initiate
/*-------------------------------------------*/
/*      Year Artchive list 'year' and count insert to inner </a>
/*-------------------------------------------*/
/*      Category list 'count insert to inner </a>
/*-------------------------------------------*/
/*      Global navigation add cptions
/*-------------------------------------------*/
/*      headfix enable
/*-------------------------------------------*/
/*      Tag Cloud _ Change font size 
/*-------------------------------------------*/
/*      HOME _ Default content hidden
/*-------------------------------------------*/

/*-------------------------------------------*/
/*      Theme setup
/*-------------------------------------------*/

add_action('after_setup_theme', 'lightning_theme_setup');
function lightning_theme_setup() {

        global $content_width;

        /*-------------------------------------------*/
        /*  Title tag
        /*-------------------------------------------*/
        add_theme_support( 'title-tag' );

        /*-------------------------------------------*/
        /*      Admin page _ Eye catch
        /*-------------------------------------------*/
        add_theme_support( 'post-thumbnails' );
        set_post_thumbnail_size( 320, 180, true );

        /*-------------------------------------------*/
        /*      Custom menu
        /*-------------------------------------------*/
        register_nav_menus( array( 'Header' => 'Header Navigation', ) );
        register_nav_menus( array( 'Footer' => 'Footer Navigation', ) );

        load_theme_textdomain('lightning', get_template_directory() . '/languages');

        /*-------------------------------------------*/
        /*      Set content width
        /*      (Auto set up to media max with.)
        /*-------------------------------------------*/
        if ( ! isset( $content_width ) ) $content_width = 750;

        /*-------------------------------------------*/
        /*      Admin page _ Add editor css
        /*-------------------------------------------*/
        add_editor_style('//cdnjs.cloudflare.com/ajax/libs/font-awesome/4.6.1/css/font-awesome.min.css');
        if( ! apply_filters('lightning-disable-theme_style', false) )
                add_editor_style('design_skin/origin/css/editor.css');

        /*-------------------------------------------*/
        /*      Feed Links
        /*-------------------------------------------*/
        add_theme_support( 'automatic-feed-links' );
}

/*-------------------------------------------*/
/*      Load JS
/*-------------------------------------------*/

add_action('wp_enqueue_scripts','lightning_addJs');
function lightning_addJs() {
        wp_enqueue_script( 'html5shiv', '//oss.maxcdn.com/html5shiv/3.7.2/html5shiv.min.js' );
        wp_script_add_data( 'html5shiv', 'conditional', 'lt IE 9' );
        wp_enqueue_script( 'respond', '//oss.maxcdn.com/respond/1.4.2/respond.min.js' );
        wp_script_add_data( 'respond', 'conditional', 'lt IE 9' );
        wp_enqueue_script( 'lightning-js', get_template_directory_uri().'/js/all_in_header_fixed.min.js', array( 'jquery' ), LIGHTNING_THEME_VERSION );
}

/* If you want to remove the header fixed,
/* you paste the bellow code to your child theme's functions.php or plugin file.
/*-------------------------------------------*/
// add_action('wp_enqueue_scripts','lightning_header_fixed_remove',100);
// function lightning_header_fixed_remove(){
//   wp_dequeue_script( 'lightning-js' );
//   wp_enqueue_script( 'lightning-no-header-fixed-js', get_template_directory_uri().'/js/all.min.js', array( 'jquery' ), LIGHTNING_THEME_VERSION );
// }

add_action( 'wp_enqueue_scripts', 'lightning_commentJs' );
function lightning_commentJs(){
        if ( is_singular() && comments_open() && get_option( 'thread_comments' ) ) {
                wp_enqueue_script( 'comment-reply' );
        }
}

/*-------------------------------------------*/
/*      Load CSS
/*-------------------------------------------*/
add_action('wp_enqueue_scripts', 'lightning_css' );
function lightning_css(){
        wp_enqueue_style( 'font-awesome', get_template_directory_uri().'/library/font-awesome/4.6.1/css/font-awesome.min.css', array(), '4.6.1' );
        wp_enqueue_style( 'lightning-theme-style', get_stylesheet_uri(), array('lightning-design-style'), LIGHTNING_THEME_VERSION );
}

// Load design skin
add_action('wp_enqueue_scripts', 'lightning_design_css' );
function lightning_design_css(){
        if( ! apply_filters('lightning-disable-theme_style', false) )
                wp_enqueue_style( 'lightning-design-style', get_template_directory_uri().'/design_skin/origin/css/style.css', array('font-awesome'), LIGHTNING_THEME_VERSION );
}

/*-------------------------------------------*/
/*      Load Theme customizer
/*-------------------------------------------*/
get_template_part( 'functions_customizer' );

/*-------------------------------------------*/
/*      Load helpers
/*-------------------------------------------*/
get_template_part( 'functions_helpers' );

/*-------------------------------------------*/
/*      Load designskin manager
/*-------------------------------------------*/
get_template_part( 'inc/class-design-manager' );

/*-------------------------------------------*/
/*      Load tga(Plugin install)
/*-------------------------------------------*/
get_template_part( 'inc/tgm-plugin-activation/tgm-config' );

/*-------------------------------------------*/
/*      Load Front PR Blocks
/*-------------------------------------------*/
get_template_part( 'inc/front-page-pr' );

/*-------------------------------------------*/
/*      WidgetArea initiate
/*-------------------------------------------*/
if ( ! function_exists( 'lightning_widgets_init' ) ) {
function lightning_widgets_init() {
        // sidebar widget area
                register_sidebar( array(
                        'name' => __('Sidebar(Home)', 'lightning' ),
                        'id' => 'front-side-top-widget-area',
                        'before_widget' => '<aside class="widget %2$s" id="%1$s">',
                        'after_widget' => '</aside>',
                        'before_title' => '<h1 class="widget-title subSection-title">',
                        'after_title' => '</h1>',
                ) );
                register_sidebar( array(
                        'name' => __( 'Sidebar(Common top)', 'lightning' ),
                        'id' => 'common-side-top-widget-area',
                        'before_widget' => '<aside class="widget %2$s" id="%1$s">',
                        'after_widget' => '</aside>',
                        'before_title' => '<h1 class="widget-title subSection-title">',
                        'after_title' => '</h1>',
                ) );
                register_sidebar( array(
                        'name' => __( 'Sidebar(Common bottom)', 'lightning' ),
                        'id' => 'common-side-bottom-widget-area',
                        'before_widget' => '<aside class="widget %2$s" id="%1$s">',
                        'after_widget' => '</aside>',
                        'before_title' => '<h1 class="widget-title subSection-title">',
                        'after_title' => '</h1>',
                ) );

        // Sidebar( post_type )

                $postTypes = get_post_types(Array('public' => true));

                foreach ($postTypes as $postType) {

                        // Get post type name
                        /*-------------------------------------------*/
                        $post_type_object = get_post_type_object($postType);
                        if($post_type_object){
                                // Set post type name
                                $postType_name = esc_html($post_type_object->labels->name);

                                // Set post type widget area
                                register_sidebar( array(
                                        'name' => sprintf( __( 'Sidebar(%s)', 'lightning' ), $postType_name ),
                                        'id' => $postType.'-side-widget-area',
                                        'description' => sprintf( __( 'This widget area appears on the %s contents page only.', 'lightning' ), $postType_name ),
                                        'before_widget' => '<aside class="widget %2$s" id="%1$s">',
                                        'after_widget' => '</aside>',
                                        'before_title' => '<h1 class="widget-title subSection-title">',
                                        'after_title' => '</h1>',
                                ) );
                        } // if($post_type_object){

                } // foreach ($postTypes as $postType) {

        // Home content top widget area

                register_sidebar( array(
                        'name' => __( 'Home content top', 'lightning' ),
                        'id' => 'home-content-top-widget-area',
                        'before_widget' => '<section class="widget %2$s" id="%1$s">',
                        'after_widget' => '</section>',
                        'before_title' => '<h1 class="mainSection-title">',
                        'after_title' => '</h1>',
                ) );

        // footer upper widget area

                register_sidebar( array(
                        'name' => __( 'Widget area of upper footer', 'lightning' ),
                        'id' => 'footer-upper-widget-1',
                        'before_widget' => '<aside class="widget %2$s" id="%1$s">',
                        'after_widget' => '</aside>',
                        'before_title' => '<h1 class="widget-title subSection-title">',
                        'after_title' => '</h1>',
                ) );

        // footer widget area

            $footer_widget_area_count = 3;
            $footer_widget_area_count = apply_filters( 'lightning_footer_widget_area_count', $footer_widget_area_count );

                for ( $i = 1; $i <= $footer_widget_area_count ;) {
                        register_sidebar( array(
                                'name' => __( 'Footer widget area ', 'lightning' ).$i,
                                'id' => 'footer-widget-'.$i,
                                'before_widget' => '<aside class="widget %2$s" id="%1$s">',
                                'after_widget' => '</aside>',
                                'before_title' => '<h1 class="widget-title subSection-title">',
                                'after_title' => '</h1>',
                        ) );
                        $i++;
                }

        // LP widget area

                $args = Array(
                                        'post_type' => 'page',
                                        'posts_per_page' => -1,
                                        'meta_key' => '_wp_page_template',
                                        'meta_value' => 'page-lp.php'
                        );
                $posts = get_posts($args);

                if ( $posts ){
                        foreach ($posts as $key => $post) {
                                register_sidebar( array(
                                        'name' => __( 'LP widget "', 'lightning' ).esc_html($post->post_title).'"',
                                        'id' => 'lp-widget-'.$post->ID,
                                        'before_widget' => '<section class="widget %2$s" id="%1$s">',
                                        'after_widget' => '</section>',
                                        'before_title' => '<h1 class="mainSection-title">',
                                        'after_title' => '</h1>',
                                ) );
                        }       
                }
                wp_reset_postdata();
}
} // if ( ! function_exists( 'lightning_widgets_init' ) ) {
add_action( 'widgets_init', 'lightning_widgets_init' );

/*-------------------------------------------*/
/*      Year Artchive list 'year' and count insert to inner </a>
/*-------------------------------------------*/
function lightning_archives_link($html){
  return preg_replace('@</a>(.+?)</li>@', '\1</a></li>', $html);
}
add_filter('get_archives_link', 'lightning_archives_link');

/*-------------------------------------------*/
/*      Category list count insert to inner </a>
/*-------------------------------------------*/
function lightning_list_categories( $output, $args ) {
        $output = preg_replace('/<\/a>\s*\((\d+)\)/',' ($1)</a>',$output);
        return $output;
}
add_filter( 'wp_list_categories', 'lightning_list_categories', 10, 2 );

/*-------------------------------------------*/
/*      Global navigation add cptions
/*-------------------------------------------*/
class description_walker extends Walker_Nav_Menu {
        function start_el(&$output, $item, $depth = 0, $args = array(), $id = 0) {
                global $wp_query;
                $indent = ( $depth ) ? str_repeat( "\t", $depth ) : '';

                $class_names = $value = '';

                $classes = empty( $item->classes ) ? array() : (array) $item->classes;

                $class_names = join( ' ', apply_filters( 'nav_menu_css_class', array_filter( $classes ), $item ) );
                $class_names = ' class="'. esc_attr( $class_names ) . '"';
                $output .= $indent . '<li id="menu-item-'. $item->ID . '"' . $value . $class_names .'>';

                $attributes  = ! empty( $item->attr_title ) ? ' title="'  . esc_attr( $item->attr_title ) .'"' : '';
                $attributes .= ! empty( $item->target )     ? ' target="' . esc_attr( $item->target     ) .'"' : '';
                $attributes .= ! empty( $item->xfn )        ? ' rel="'    . esc_attr( $item->xfn        ) .'"' : '';
                $attributes .= ! empty( $item->url )        ? ' href="'   . esc_attr( $item->url        ) .'"' : '';

                $prepend = '<strong class="gMenu_name">';
                $append = '</strong>';
                $description  = ! empty( $item->description ) ? '<span class="gMenu_description">'.esc_attr( $item->description ).'</span>' : '';

                if($depth != 0) {
                        $description = $append = $prepend = "";
                }

                $item_output = $args->before;
                $item_output .= '<a'. $attributes .'>';
                $item_output .= $args->link_before .$prepend.apply_filters( 'the_title', $item->title, $item->ID ).$append;
                $item_output .= $description.$args->link_after;
                $item_output .= '</a>';
                $item_output .= $args->after;

                $output .= apply_filters( 'walker_nav_menu_start_el', $item_output, $item, $depth, $args );
        }
}

/*-------------------------------------------*/
/*      headfix enable
/*-------------------------------------------*/
add_filter( 'body_class', 'lightning_body_class' );
function lightning_body_class( $class ){
        // header fix
        if( apply_filters( 'lightning_headfix_enable', true ) ) {
                $class[] = 'headfix';
        }
        // header height changer
        if( apply_filters( 'lightning_header_height_changer_enable', true ) ) {
                $class[] = 'header_height_changer';
        }
        return $class;
}

// lightning headfix disabel sample
/*
add_filter( 'lightning_headfix_enable', 'lightning_headfix_disabel');
function lightning_headfix_disabel(){
        return false;
}
*/

// lightning header height changer disabel sample
/*
add_filter( 'lightning_header_height_changer_enable', 'lightning_header_height_changer_disabel');
function lightning_header_height_changer_disabel(){
        return false;
}
*/

/*-------------------------------------------
/*      Tag Cloud _ Change font size 
/*-------------------------------------------*/
function lightning_tag_cloud_filter($args) {
        $args['smallest'] = 10;
        $args['largest'] = 10;
        return $args;
}
add_filter('widget_tag_cloud_args', 'lightning_tag_cloud_filter');

/*-------------------------------------------*/
/*      HOME _ Default content hidden
/*-------------------------------------------*/
add_filter( 'is_lightning_home_content_display', 'lightning_home_content_hidden' );
function lightning_home_content_hidden( $flag ){
        global $lightning_theme_options;
        if ( isset($lightning_theme_options['top_default_content_hidden']) && $lightning_theme_options['top_default_content_hidden'] ) {
                $flag = false;
        }
        return $flag;
}