diff --git a/Gruntfile.js b/Gruntfile.js
index 8694040..7c1d414 100644
--- a/Gruntfile.js
+++ b/Gruntfile.js
@@ -3,10 +3,10 @@ module.exports = function(grunt) {
 	grunt.initConfig({
 		exec: {
 			phpcs_plugin: {
-				cmd: 'phpcs --standard=WordPress *.php'
+				cmd: 'phpcs --standard=WordPress-Core markdown.php --report-width=200 -s'
 			},
 			phpcs_src: {
-				cmd: 'phpcs --standard=PSR2 src'
+				cmd: 'phpcs --standard=PSR2 src --report-width=200 -s'
 			}
 		},
 		compass: {
diff --git a/markdown.php b/markdown.php
index 3621c84..7e6c3ba 100644
--- a/markdown.php
+++ b/markdown.php
@@ -1,415 +1,417 @@
-<?php
-/*
- Plugin Name: GitHub Flavored Markdown for WordPress
- Plugin URI: https://github.com/makotokw/wp-gfm
- Version: 0.8
- Description: Converts block in GitHub Flavored Markdown by using shortcode <code>[gfm]</code> and support PHP-Markdown by using shortcode <code>[markdown]</code>
- Author: makoto_kw
- Author URI: http://makotokw.com/
- License: MIT
- */
-
-class WP_GFM
-{
-	const NAME = 'WP_GFM';
-	const VERSION = '0.7.3';
-	const DEFAULT_RENDER_URL = 'https://api.github.com/markdown/raw';
-
-	// google-code-prettify: https://code.google.com/p/google-code-prettify/
-	const FENCED_CODE_BLOCKS_TEMPLATE_FOR_GOOGLE_CODE_PRETTIFY = '<pre class="prettyprint lang-{{lang}}" title="{{title}}">{{codeblock}}</pre>';
-
-	public $agent         = '';
-	public $url           = '';
-	public $has_converter = false;
-	public $gfm_options   = array();
-
-	static function get_instance() {
-		static $plugin = null;
-		if ( ! $plugin ) {
-			$plugin = new WP_GFM();
-		}
-		return $plugin;
-	}
-
-	private function __construct() {
-		$this->agent = self::NAME . '/' . self::VERSION;
-		$this->url   = plugins_url( '', __FILE__ );
-
-		$this->gfm_options = wp_parse_args(
-			(array) get_option( 'gfm' ),
-			array(
-				'general_ad' => false,
-				'php_md_always_convert' => false,
-				'php_md_use_autolink' => false,
-				'php_md_fenced_code_blocks_template' => self::FENCED_CODE_BLOCKS_TEMPLATE_FOR_GOOGLE_CODE_PRETTIFY,
-				'render_url' => self::DEFAULT_RENDER_URL,
-			)
-		);
-
-		if ( is_admin() ) {
-			add_action( 'admin_init', array( $this, 'admin_init' ) );
-			add_action( 'admin_menu', array( $this, 'admin_menu' ) );
-			add_action( 'admin_print_footer_scripts', array( $this, 'admin_quicktags' ) );
-		} else {
-			add_action( 'wp_enqueue_scripts', array( $this, 'wp_enqueue_styles' ) );
-		}
-	}
-
-	function wp_enqueue_styles() {
-		wp_enqueue_style( 'wp-gfm', $this->url . '/css/markdown.css', array(), self::VERSION );
-	}
-
-	function php_markdown_init() {
-		if ( class_exists( '\Gfm\Markdown\Extra' ) ) {
-			$this->has_converter = true;
-			\Gfm\Markdown\Extra::setElementCssPrefix( 'wp-gfm-' );
-			\Gfm\Markdown\Extra::$useAutoLinkExtras        = $this->gfm_options['php_md_use_autolink'] == true;
-			\Gfm\Markdown\Extra::$fencedCodeBlocksTemplate = $this->gfm_options['php_md_fenced_code_blocks_template'];
-		}
-
-		if ( $this->gfm_options['php_md_always_convert'] ) {
-			add_action( 'the_content', array( $this, 'force_convert' ), 7 );
-		} else {
-			add_action( 'the_content', array( $this, 'the_content' ), 7 );
-		}
-
-		if ( $this->gfm_options['general_ad'] ) {
-			add_action( 'the_content', array( $this, 'the_content_ad' ), 8 );
-		}
-
-		add_shortcode( 'embed_markdown', array( $this, 'shortcode_embed_markdown' ) );
-		add_filter( 'pre_comment_content', array( $this, 'pre_comment_content' ), 5 );
-	}
-
-	function admin_init() {
-		register_setting( 'gfm_option_group', 'gfm_array', array( $this, 'option_sanitize_gfm' ) );
-
-		add_settings_section(
-			'setting_section_general',
-			'General',
-			array( $this, 'setting_section_general' ),
-			'gfm-setting-admin'
-		);
-
-		add_settings_field(
-			'general_ad',
-			'',
-			array( $this, 'create_gfm_general_ad_field' ),
-			'gfm-setting-admin',
-			'setting_section_general'
-		);
-
-		add_settings_section(
-			'setting_section_php_markdown',
-			'PHP Markdown',
-			array( $this, 'print_section_php_markdown' ),
-			'gfm-setting-admin'
-		);
-
-		add_settings_field(
-			'php_md_always_convert',
-			'',
-			array( $this, 'create_gfm_php_md_always_convert_field' ),
-			'gfm-setting-admin',
-			'setting_section_php_markdown'
-		);
-
-		add_settings_field(
-			'php_md_use_autolink',
-			'',
-			array( $this, 'create_gfm_php_md_use_autolink_field' ),
-			'gfm-setting-admin',
-			'setting_section_php_markdown'
-		);
-
-		add_settings_field(
-			'php_md_fenced_code_blocks_template',
-			'Fenced Code Blocks Template',
-			array( $this, 'create_gfm_php_md_fenced_code_blocks_template_field' ),
-			'gfm-setting-admin',
-			'setting_section_php_markdown'
-		);
-
-		add_settings_section(
-			'setting_section_gfm',
-			'GitHub Flavored Markdown',
-			array( $this, 'print_section_gfm' ),
-			'gfm-setting-admin'
-		);
-
-		add_settings_field(
-			'render_url',
-			'Render URL',
-			array( $this, 'create_gfm_render_url_field' ),
-			'gfm-setting-admin',
-			'setting_section_gfm'
-		);
-	}
-
-	function admin_menu() {
-		if ( function_exists( 'add_options_page' ) ) {
-			add_options_page(
-				'GFM Plugin Settings',
-				'WP GFM',
-				'manage_options',
-				'wp-gfm',
-				array( $this, 'options_page' )
-			);
-		}
-	}
-
-	function options_page() {
-		?>
-		<div class="wrap wrap-wp-gfm">
-
-			<h2>WP GFM Settings</h2>
-
-			<!--suppress HtmlUnknownTarget -->
-			<form method="post" action="options.php">
-				<?php
-				settings_fields( 'gfm_option_group' );
-				do_settings_sections( 'gfm-setting-admin' );
-				?>
-				<?php submit_button(); ?>
-			</form>
-		</div>
-	<?php
-	}
-
-	function option_sanitize_gfm( $input ) {
-		if ( get_option( 'gfm' ) === false ) {
-			add_option( 'gfm', $input );
-		} else {
-			update_option( 'gfm', $input );
-		}
-		return $input;
-	}
-
-	function setting_section_general() {
-	}
-
-	function create_gfm_general_ad_field() {
-		echo '<input type="checkbox" id="general_ad" name="gfm_array[general_ad]" value="1" class="code" '
-			. checked( 1, $this->gfm_options['general_ad'], false ) . ' /> Add a link of wp-gfm plugin to content';
-	}
-
-	function print_section_php_markdown() {
-	}
-
-	function create_gfm_php_md_always_convert_field() {
-		echo '<input type="checkbox" id="php_md_always_convert" name="gfm_array[php_md_always_convert]" value="1" class="code" '
-			. checked( 1, $this->gfm_options['php_md_always_convert'], false ) . ' /> All contents are markdown!'
-			. '<p class="description">The plugin converts content even if it is not surrounded by [markdown]</p>';
-	}
-
-	function create_gfm_php_md_use_autolink_field() {
-		echo '<input type="checkbox" id="gfm_php_md_use_autolink" name="gfm_array[php_md_use_autolink]" value="1" class="code" '
-			. checked( 1, $this->gfm_options['php_md_use_autolink'], false ) . ' /> Use AutoLink';
-	}
-
-	function create_gfm_php_md_fenced_code_blocks_template_field() {
-		$value = esc_attr( $this->gfm_options['php_md_fenced_code_blocks_template'] );
-		echo '<textarea id="gfm_php_md_fenced_code_blocks_template" name="gfm_array[php_md_fenced_code_blocks_template]" class="large-text">' . $value . '</textarea>'
-			. '<p class="description">'
-			. '{{lang}}, {{title}}, {{codeblock}}<br/>'
-			. 'For <a href="https://code.google.com/p/google-code-prettify/" target="_blank">google-code-prettify</a>: <code>' . esc_attr( self::FENCED_CODE_BLOCKS_TEMPLATE_FOR_GOOGLE_CODE_PRETTIFY ) . '</code><br/>'
-			. '</p>';
-	}
-
-	function print_section_gfm() {
-	}
-
-	function create_gfm_render_url_field() {
-		$value = esc_attr( $this->gfm_options['render_url'] );
-		echo '<input type="text" id="gfm_render_url" name="gfm_array[render_url]" value="' . $value . '" class="regular-text"/>';
-	}
-
-	function shortcode_gfm( /** @noinspection PhpUnusedParameterInspection */ $atts, $content = '' ) {
-		return '<div class="markdown-body gfm-content">' . $this->convert_html_by_render_url( $this->gfm_options['render_url'], $content ) . '</div>';
-	}
-
-	function shortcode_markdown( /** @noinspection PhpUnusedParameterInspection */ $atts, $content = '' ) {
-		if ( $this->has_converter ) {
-			return '<div class="markdown-body markdown-content">' . \Gfm\Markdown\Extra::defaultTransform( $content ) . '</div>';
-		}
-		return $content;
-	}
-
-	function shortcode_embed( $use_gfm, $atts, /** @noinspection PhpUnusedParameterInspection */ $content ) {
-		/**
-		 * @var string $url
-		 */
-		$defaults = array( 'url' => '' );
-		extract( shortcode_atts( $defaults, $atts ) );
-		if ( empty( $url ) ) {
-			return '';
-		}
-
-		$args = array();
-		$response = wp_remote_get( $url, $args );
-		if ( ! is_wp_error( $response ) ) {
-			$body = wp_remote_retrieve_body( $response );
-
-			// https://raw.githubusercontent.com/makotokw/wp-gfm/master/README.md ->
-			// https://github.com/makotokw/wp-gfm/blob/master/README.md
-			$r = '/^https?:\/\/raw\.githubusercontent\.com/';
-			if ( preg_match( $r, $url ) ) {
-				$url = preg_replace( $r, 'https://github.com', $url );
-				$url = '<a href="' . $url . '">' . $url . '</a>';
-			}
-
-			if ( $use_gfm ) {
-				return '<div class="markdown-file">'
-				. $this->shortcode_gfm( $atts, $body )
-				. '<div <div class="markdown-meta">' . $url . '</div></div>';
-			} else {
-				return '<div class="markdown-file">'
-				. $this->shortcode_markdown( $atts, $body )
-				. '<div <div class="markdown-meta">' . $url . '</div></div>';
-			}
-		}
-		return '';
-	}
-
-	function shortcode_embed_gfm( $atts, /** @noinspection PhpUnusedParameterInspection */ $content ) {
-		return $this->shortcode_embed( true, $atts, $content );
-	}
-
-	function shortcode_embed_markdown( $atts, /** @noinspection PhpUnusedParameterInspection */ $content ) {
-		return $this->shortcode_embed( false, $atts, $content );
-	}
-
-	function force_convert( $content ) {
-		$content = preg_replace( '{\[/?markdown\]}', '', $content );
-		return wp_markdown( $content );
-	}
-
-	function the_content( $content ) {
-		if ( class_exists( '\Gfm\Markdown\Extra' ) ) {
-			if ( isset($GLOBALS['post']) ) {
-				if ( isset($GLOBALS['post']->ID) ) {
-					\Gfm\Markdown\Extra::setElementIdPrefix( 'post-' . $GLOBALS['post']->ID . '-md-' );
-				}
-			}
-		}
-
-		$content = preg_replace_callback( '/\[markdown\](.*?)\[\/markdown\]/s', create_function( '$matches', 'return wp_markdown($matches[1]);' ), $content );
-		$content = preg_replace_callback( '/\[gfm\](.*?)\[\/gfm\]/s', create_function( '$matches', 'return wp_fgm($matches[1]);' ), $content );
-		return $content;
-	}
-
-	function the_content_ad( $context ) {
-		if ( strpos( $context, '<div class="markdown-content">' ) !== false ) {
-			return $context . '<div class="wp-gfm-ad"><span class="wp-gfm-powered-by">With Markdown By <a href="https://github.com/makotokw/wp-gfm" target="_blank">wp-gfm</a></span></div>';
-		}
-		return $context;
-	}
-
-	function pre_comment_content( $comment ) {
-		$comment = stripslashes( $comment );
-		$comment = $this->the_content( $comment );
-		$comment = addslashes( $comment );
-		return $comment;
-	}
-
-	function convert_html_by_render_url( $renderUrl, $text ) {
-		$response = wp_remote_request(
-			$renderUrl,
-			array(
-				'method'     => 'POST',
-				'timeout'    => 10,
-				'user-agent' => $this->agent,
-				'headers'    => array( 'Content-Type' => 'text/plain; charset=UTF-8' ),
-				'body'       => $text,
-			)
-		);
-		if ( is_wp_error( $response ) ) {
-			$msg = self::NAME . ' HttpError: ' . $response->get_error_message();
-			error_log( $msg . ' on ' . $renderUrl );
-			return $msg;
-		}
-
-		if ( $response && isset($response['response']['code']) && 200 != $response['response']['code'] ) {
-			$msg = sprintf( self::NAME . ' HttpError: %s %s', $response['response']['code'], $response['response']['message'] );
-			error_log( $msg . ' on ' . $renderUrl );
-			return $msg;
-		}
-		return wp_remote_retrieve_body( $response );
-	}
-
-
-	function admin_quicktags() {
-		// http://wordpress.stackexchange.com/questions/37849/add-custom-shortcode-button-to-editor
-		/* Add custom Quicktag buttons to the editor Wordpress ver. 3.3 and above only
-		 *
-		 * Params for this are:
-		 * - Button HTML ID (required)
-		 * - Button display, value="" attribute (required)
-		 * - Opening Tag (required)
-		 * - Closing Tag (required)
-		 * - Access key, accesskey="" attribute for the button (optional)
-		 * - Title, title="" attribute (optional)
-		 * - Priority/position on bar, 1-9 = first, 11-19 = second, 21-29 = third, etc. (optional)
-		 */
-		?>
-		<script type="text/javascript">
-			(function ($) {
-				if (typeof(QTags) != 'undefined') {
-					$.each(['markdown', 'gfm'], function (index, c) {
-						QTags.addButton(c, '[' + c + ']', '[' + c + ']', '[/' + c + ']');
-					});
-				}
-			})(jQuery);
-		</script>
-	<?php
-	}
-}
-
-add_action( 'init', 'wp_gfm_init' );
-
-function wp_gfm_init() {
-	$plugin = WP_GFM::get_instance();
-
-	// use Michelf/Markdown if PHP 5.3+
-	if ( defined( 'PHP_VERSION_ID' ) ) {
-		if ( PHP_VERSION_ID >= 50300 ) {
-			if ( file_exists( dirname( __FILE__ ) . '/vendor/autoload.php' ) ) {
-				require_once dirname( __FILE__ ) . '/vendor/autoload.php';
-				$plugin->php_markdown_init();
-			}
-		}
-	}
-
-	include_once 'updater.php';
-	if ( is_admin() && class_exists( 'WP_GitHub_Updater' ) ) {
-		/** @noinspection PhpUnusedLocalVariableInspection */
-		$updater = new WP_GitHub_Updater(
-			array(
-				'slug'               => plugin_basename( __FILE__ ),
-				'proper_folder_name' => 'wp-gfm',
-				'api_url'            => 'https://api.github.com/repos/makotokw/wp-gfm',
-				'raw_url'            => 'https://raw.github.com/makotokw/wp-gfm/master',
-				'github_url'         => 'https://github.com/makotokw/wp-gfm',
-				'zip_url'            => 'https://github.com/makotokw/wp-gfm/archive/master.zip',
-				'sslverify'          => true,
-				'requires'           => '3.1',
-				'tested'             => '4.3.1',
-				'readme'             => 'README.md',
-			)
-		);
-	}
-}
-
-function wp_markdown( $content ) {
-	$p = WP_GFM::get_instance();
-	return $p->shortcode_markdown( null, $content );
-}
-
-function wp_fgm( $content ) {
-	$p = WP_GFM::get_instance();
-	if ( ! empty($p->gfm_options['render_url']) ) {
-		return $p->shortcode_gfm( null, $content );
-	} else {
-		return $p->shortcode_markdown( null, $content );
-	}
-}
+<?php
+/**
+ Plugin Name: GitHub Flavored Markdown for WordPress
+ Plugin URI: https://github.com/makotokw/wp-gfm
+ Version: 0.8
+ Description: Converts block in GitHub Flavored Markdown by using shortcode <code>[gfm]</code> and support PHP-Markdown by using shortcode <code>[markdown]</code>
+ Author: makoto_kw
+ Author URI: http://makotokw.com/
+ License: MIT
+ */
+
+class WP_GFM
+{
+	const NAME = 'WP_GFM';
+	const VERSION = '0.8';
+	const DEFAULT_RENDER_URL = 'https://api.github.com/markdown/raw';
+
+	// google-code-prettify: https://code.google.com/p/google-code-prettify/
+	const FENCED_CODE_BLOCKS_TEMPLATE_FOR_GOOGLE_CODE_PRETTIFY = '<pre class="prettyprint lang-{{lang}}" title="{{title}}">{{codeblock}}</pre>';
+
+	public $agent         = '';
+	public $url           = '';
+	public $has_converter = false;
+	public $gfm_options   = array();
+
+	static function get_instance() {
+		static $plugin = null;
+		if ( ! $plugin ) {
+			$plugin = new WP_GFM();
+		}
+		return $plugin;
+	}
+
+	private function __construct() {
+		$this->agent = self::NAME . '/' . self::VERSION;
+		$this->url   = plugins_url( '', __FILE__ );
+
+		$this->gfm_options = wp_parse_args(
+			(array) get_option( 'gfm' ),
+			array(
+				'general_ad' => false,
+				'php_md_always_convert' => false,
+				'php_md_use_autolink' => false,
+				'php_md_fenced_code_blocks_template' => self::FENCED_CODE_BLOCKS_TEMPLATE_FOR_GOOGLE_CODE_PRETTIFY,
+				'render_url' => self::DEFAULT_RENDER_URL,
+			)
+		);
+
+		if ( is_admin() ) {
+			add_action( 'admin_init', array( $this, 'admin_init' ) );
+			add_action( 'admin_menu', array( $this, 'admin_menu' ) );
+			add_action( 'admin_print_footer_scripts', array( $this, 'admin_quicktags' ) );
+		} else {
+			add_action( 'wp_enqueue_scripts', array( $this, 'wp_enqueue_styles' ) );
+		}
+	}
+
+	function wp_enqueue_styles() {
+		wp_enqueue_style( 'wp-gfm', $this->url . '/css/markdown.css', array(), self::VERSION );
+	}
+
+	function php_markdown_init() {
+		if ( class_exists( '\Gfm\Markdown\Extra' ) ) {
+			$this->has_converter = true;
+			\Gfm\Markdown\Extra::setElementCssPrefix( 'wp-gfm-' );
+			// @codingStandardsIgnoreStart
+			\Gfm\Markdown\Extra::$useAutoLinkExtras        = true == $this->gfm_options['php_md_use_autolink'];
+			\Gfm\Markdown\Extra::$fencedCodeBlocksTemplate = $this->gfm_options['php_md_fenced_code_blocks_template'];
+			// @codingStandardsIgnoreEnd
+		}
+
+		if ( $this->gfm_options['php_md_always_convert'] ) {
+			add_action( 'the_content', array( $this, 'force_convert' ), 7 );
+		} else {
+			add_action( 'the_content', array( $this, 'the_content' ), 7 );
+		}
+
+		if ( $this->gfm_options['general_ad'] ) {
+			add_action( 'the_content', array( $this, 'the_content_ad' ), 8 );
+		}
+
+		add_shortcode( 'embed_markdown', array( $this, 'shortcode_embed_markdown' ) );
+		add_filter( 'pre_comment_content', array( $this, 'pre_comment_content' ), 5 );
+	}
+
+	function admin_init() {
+		register_setting( 'gfm_option_group', 'gfm_array', array( $this, 'option_sanitize_gfm' ) );
+
+		add_settings_section(
+			'setting_section_general',
+			'General',
+			array( $this, 'setting_section_general' ),
+			'gfm-setting-admin'
+		);
+
+		add_settings_field(
+			'general_ad',
+			'',
+			array( $this, 'create_gfm_general_ad_field' ),
+			'gfm-setting-admin',
+			'setting_section_general'
+		);
+
+		add_settings_section(
+			'setting_section_php_markdown',
+			'PHP Markdown',
+			array( $this, 'print_section_php_markdown' ),
+			'gfm-setting-admin'
+		);
+
+		add_settings_field(
+			'php_md_always_convert',
+			'',
+			array( $this, 'create_gfm_php_md_always_convert_field' ),
+			'gfm-setting-admin',
+			'setting_section_php_markdown'
+		);
+
+		add_settings_field(
+			'php_md_use_autolink',
+			'',
+			array( $this, 'create_gfm_php_md_use_autolink_field' ),
+			'gfm-setting-admin',
+			'setting_section_php_markdown'
+		);
+
+		add_settings_field(
+			'php_md_fenced_code_blocks_template',
+			'Fenced Code Blocks Template',
+			array( $this, 'create_gfm_php_md_fenced_code_blocks_template_field' ),
+			'gfm-setting-admin',
+			'setting_section_php_markdown'
+		);
+
+		add_settings_section(
+			'setting_section_gfm',
+			'GitHub Flavored Markdown',
+			array( $this, 'print_section_gfm' ),
+			'gfm-setting-admin'
+		);
+
+		add_settings_field(
+			'render_url',
+			'Render URL',
+			array( $this, 'create_gfm_render_url_field' ),
+			'gfm-setting-admin',
+			'setting_section_gfm'
+		);
+	}
+
+	function admin_menu() {
+		if ( function_exists( 'add_options_page' ) ) {
+			add_options_page(
+				'GFM Plugin Settings',
+				'WP GFM',
+				'manage_options',
+				'wp-gfm',
+				array( $this, 'options_page' )
+			);
+		}
+	}
+
+	function options_page() {
+		?>
+		<div class="wrap wrap-wp-gfm">
+
+			<h2>WP GFM Settings</h2>
+
+			<!--suppress HtmlUnknownTarget -->
+			<form method="post" action="options.php">
+				<?php
+				settings_fields( 'gfm_option_group' );
+				do_settings_sections( 'gfm-setting-admin' );
+				?>
+				<?php submit_button(); ?>
+			</form>
+		</div>
+	<?php
+	}
+
+	function option_sanitize_gfm( $input ) {
+		if ( get_option( 'gfm' ) === false ) {
+			add_option( 'gfm', $input );
+		} else {
+			update_option( 'gfm', $input );
+		}
+		return $input;
+	}
+
+	function setting_section_general() {
+	}
+
+	function create_gfm_general_ad_field() {
+		echo '<input type="checkbox" id="general_ad" name="gfm_array[general_ad]" value="1" class="code" '
+			. checked( 1, $this->gfm_options['general_ad'], false ) . ' /> Add a link of wp-gfm plugin to content';
+	}
+
+	function print_section_php_markdown() {
+	}
+
+	function create_gfm_php_md_always_convert_field() {
+		echo '<input type="checkbox" id="php_md_always_convert" name="gfm_array[php_md_always_convert]" value="1" class="code" '
+			. checked( 1, $this->gfm_options['php_md_always_convert'], false ) . ' /> All contents are markdown!'
+			. '<p class="description">The plugin converts content even if it is not surrounded by [markdown]</p>';
+	}
+
+	function create_gfm_php_md_use_autolink_field() {
+		echo '<input type="checkbox" id="gfm_php_md_use_autolink" name="gfm_array[php_md_use_autolink]" value="1" class="code" '
+			. checked( 1, $this->gfm_options['php_md_use_autolink'], false ) . ' /> Use AutoLink';
+	}
+
+	function create_gfm_php_md_fenced_code_blocks_template_field() {
+		$value = esc_attr( $this->gfm_options['php_md_fenced_code_blocks_template'] );
+		echo '<textarea id="gfm_php_md_fenced_code_blocks_template" name="gfm_array[php_md_fenced_code_blocks_template]" class="large-text">' . $value . '</textarea>'
+			. '<p class="description">'
+			. '{{lang}}, {{title}}, {{codeblock}}<br/>'
+			. 'For <a href="https://code.google.com/p/google-code-prettify/" target="_blank">google-code-prettify</a>: <code>' . esc_attr( self::FENCED_CODE_BLOCKS_TEMPLATE_FOR_GOOGLE_CODE_PRETTIFY ) . '</code><br/>'
+			. '</p>';
+	}
+
+	function print_section_gfm() {
+	}
+
+	function create_gfm_render_url_field() {
+		$value = esc_attr( $this->gfm_options['render_url'] );
+		echo '<input type="text" id="gfm_render_url" name="gfm_array[render_url]" value="' . $value . '" class="regular-text"/>';
+	}
+
+	function shortcode_gfm( /** @noinspection PhpUnusedParameterInspection */ $atts, $content = '' ) {
+		return '<div class="markdown-body gfm-content">' . $this->convert_html_by_render_url( $this->gfm_options['render_url'], $content ) . '</div>';
+	}
+
+	function shortcode_markdown( /** @noinspection PhpUnusedParameterInspection */ $atts, $content = '' ) {
+		if ( $this->has_converter ) {
+			return '<div class="markdown-body markdown-content">' . \Gfm\Markdown\Extra::defaultTransform( $content ) . '</div>';
+		}
+		return $content;
+	}
+
+	function shortcode_embed( $use_gfm, $atts, /** @noinspection PhpUnusedParameterInspection */ $content ) {
+		/**
+		 * @var string $url
+		 */
+		$defaults = array( 'url' => '' );
+		extract( shortcode_atts( $defaults, $atts ) );
+		if ( empty( $url ) ) {
+			return '';
+		}
+
+		$args = array();
+		$response = wp_remote_get( $url, $args );
+		if ( ! is_wp_error( $response ) ) {
+			$body = wp_remote_retrieve_body( $response );
+
+			// https://raw.githubusercontent.com/makotokw/wp-gfm/master/README.md ->
+			// https://github.com/makotokw/wp-gfm/blob/master/README.md
+			$r = '/^https?:\/\/raw\.githubusercontent\.com/';
+			if ( preg_match( $r, $url ) ) {
+				$url = preg_replace( $r, 'https://github.com', $url );
+				$url = '<a href="' . $url . '">' . $url . '</a>';
+			}
+
+			if ( $use_gfm ) {
+				return '<div class="markdown-file">'
+				. $this->shortcode_gfm( $atts, $body )
+				. '<div <div class="markdown-meta">' . $url . '</div></div>';
+			} else {
+				return '<div class="markdown-file">'
+				. $this->shortcode_markdown( $atts, $body )
+				. '<div <div class="markdown-meta">' . $url . '</div></div>';
+			}
+		}
+		return '';
+	}
+
+	function shortcode_embed_gfm( $atts, /** @noinspection PhpUnusedParameterInspection */ $content ) {
+		return $this->shortcode_embed( true, $atts, $content );
+	}
+
+	function shortcode_embed_markdown( $atts, /** @noinspection PhpUnusedParameterInspection */ $content ) {
+		return $this->shortcode_embed( false, $atts, $content );
+	}
+
+	function force_convert( $content ) {
+		$content = preg_replace( '{\[/?markdown\]}', '', $content );
+		return wp_markdown( $content );
+	}
+
+	function the_content( $content ) {
+		if ( class_exists( '\Gfm\Markdown\Extra' ) ) {
+			if ( isset( $GLOBALS['post'] ) ) {
+				if ( isset( $GLOBALS['post']->ID ) ) {
+					\Gfm\Markdown\Extra::setElementIdPrefix( 'post-' . $GLOBALS['post']->ID . '-md-' );
+				}
+			}
+		}
+
+		$content = preg_replace_callback( '/\[markdown\](.*?)\[\/markdown\]/s', create_function( '$matches', 'return wp_markdown($matches[1]);' ), $content );
+		$content = preg_replace_callback( '/\[gfm\](.*?)\[\/gfm\]/s', create_function( '$matches', 'return wp_fgm($matches[1]);' ), $content );
+		return $content;
+	}
+
+	function the_content_ad( $context ) {
+		if ( strpos( $context, '<div class="markdown-content">' ) !== false ) {
+			return $context . '<div class="wp-gfm-ad"><span class="wp-gfm-powered-by">With Markdown By <a href="https://github.com/makotokw/wp-gfm" target="_blank">wp-gfm</a></span></div>';
+		}
+		return $context;
+	}
+
+	function pre_comment_content( $comment ) {
+		$comment = stripslashes( $comment );
+		$comment = $this->the_content( $comment );
+		$comment = addslashes( $comment );
+		return $comment;
+	}
+
+	function convert_html_by_render_url( $render_url, $text ) {
+		$response = wp_remote_request(
+			$render_url,
+			array(
+				'method'     => 'POST',
+				'timeout'    => 10,
+				'user-agent' => $this->agent,
+				'headers'    => array( 'Content-Type' => 'text/plain; charset=UTF-8' ),
+				'body'       => $text,
+			)
+		);
+		if ( is_wp_error( $response ) ) {
+			$msg = self::NAME . ' HttpError: ' . $response->get_error_message();
+			error_log( $msg . ' on ' . $render_url );
+			return $msg;
+		}
+
+		if ( $response && isset( $response['response']['code'] ) && 200 != $response['response']['code'] ) {
+			$msg = sprintf( self::NAME . ' HttpError: %s %s', $response['response']['code'], $response['response']['message'] );
+			error_log( $msg . ' on ' . $render_url );
+			return $msg;
+		}
+		return wp_remote_retrieve_body( $response );
+	}
+
+
+	function admin_quicktags() {
+		// http://wordpress.stackexchange.com/questions/37849/add-custom-shortcode-button-to-editor
+		/* Add custom Quicktag buttons to the editor Wordpress ver. 3.3 and above only
+		 *
+		 * Params for this are:
+		 * - Button HTML ID (required)
+		 * - Button display, value="" attribute (required)
+		 * - Opening Tag (required)
+		 * - Closing Tag (required)
+		 * - Access key, accesskey="" attribute for the button (optional)
+		 * - Title, title="" attribute (optional)
+		 * - Priority/position on bar, 1-9 = first, 11-19 = second, 21-29 = third, etc. (optional)
+		 */
+		?>
+		<script type="text/javascript">
+			(function ($) {
+				if (typeof(QTags) != 'undefined') {
+					$.each(['markdown', 'gfm'], function (index, c) {
+						QTags.addButton(c, '[' + c + ']', '[' + c + ']', '[/' + c + ']');
+					});
+				}
+			})(jQuery);
+		</script>
+	<?php
+	}
+}
+
+add_action( 'init', 'wp_gfm_init' );
+
+function wp_gfm_init() {
+	$plugin = WP_GFM::get_instance();
+
+	// use Michelf/Markdown if PHP 5.3+
+	if ( defined( 'PHP_VERSION_ID' ) ) {
+		if ( PHP_VERSION_ID >= 50300 ) {
+			if ( file_exists( dirname( __FILE__ ) . '/vendor/autoload.php' ) ) {
+				require_once dirname( __FILE__ ) . '/vendor/autoload.php';
+				$plugin->php_markdown_init();
+			}
+		}
+	}
+
+	include_once 'updater.php';
+	if ( is_admin() && class_exists( 'WP_GitHub_Updater' ) ) {
+		/** @noinspection PhpUnusedLocalVariableInspection */
+		$updater = new WP_GitHub_Updater(
+			array(
+				'slug'               => plugin_basename( __FILE__ ),
+				'proper_folder_name' => 'wp-gfm',
+				'api_url'            => 'https://api.github.com/repos/makotokw/wp-gfm',
+				'raw_url'            => 'https://raw.github.com/makotokw/wp-gfm/master',
+				'github_url'         => 'https://github.com/makotokw/wp-gfm',
+				'zip_url'            => 'https://github.com/makotokw/wp-gfm/archive/master.zip',
+				'sslverify'          => true,
+				'requires'           => '3.1',
+				'tested'             => '4.3.1',
+				'readme'             => 'README.md',
+			)
+		);
+	}
+}
+
+function wp_markdown( $content ) {
+	$p = WP_GFM::get_instance();
+	return $p->shortcode_markdown( null, $content );
+}
+
+function wp_fgm( $content ) {
+	$p = WP_GFM::get_instance();
+	if ( ! empty( $p->gfm_options['render_url'] ) ) {
+		return $p->shortcode_gfm( null, $content );
+	} else {
+		return $p->shortcode_markdown( null, $content );
+	}
+}