ccss.php

<?php
/**
 * Plugin Name: Custom CSS for Posts and Pages (CCSS)
 * Plugin URI: https://github.com/ryersonlibrary/custom-css-stylesheet-for-posts-or-pages
 * Description: An easy way to include custom stylesheets per post/page. Legacy plugin support for the Ryerson University Library & Archives website.
 * Version: 1.21.2
 * Author: Ryerson University Library, Gerasimos Tsiamalos
 * Author URI: https://github.com/ryersonlibrary/
 * GitHub Plugin URI: https://github.com/ryersonlibrary/custom-css-stylesheet-for-posts-or-pages
 *
 * Copyright 2010  Gerasimos Tsiamalos  (email : tsiger@gmail.com)
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 * 
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 * 
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 */


/* CHANGE THE FOLLOWING IF YOU NEED A DIFFERENT PATH IT MUST BE A SUBDIR IN YOUR THEME'S FOLDER */
define('CCSS_PATH','/custom-css/');
/* AND THAT'S ABOUT IT */

define('CCSS_VERSION','1.2');

function ccss_box() {
 $ccss_post_types = _ccss_get_post_types();
	
	foreach ($ccss_post_types as $key=>$value)
	{
		add_meta_box( 'custom-css', 'Custom CSS for posts/pages (CCSS)', 'ccss_add_box', $key, 'normal','high' );
	}
}

function ccss_add_box() {
  global $post_ID;
  $current = get_post_meta($post_ID, 'css_sheet', 'true'); 
  $dir_url = get_stylesheet_directory()	. CCSS_PATH;
  echo "Select your custom stylesheet:";
  echo "<select id='ccss' name='ccss'>";
  echo "<option value='-1'>Select a stylesheet</option>";  
  if ($handle = opendir($dir_url)) {
    while (false !== ($file = readdir($handle))) {
        if ($file != "." && $file != "..") {
            if ($current != $file) {
             echo "<option value='". $file . "'>" . $file . "</option>";
            }
            else {
             echo "<option value='". $file . "' selected='selected'>" . $file . "</option>";
            }
        }
    }
    closedir($handle);
   } 
  echo "</select>";
} 

function ccss_save() {	
	global $post_ID;

  if (defined('DOING_AUTOSAVE') && DOING_AUTOSAVE ) return;
  
  //if (!current_user_can( 'edit_post', $post_id ) ) return; ***CN***
  
  if ( isset($_POST['post_ID']) && isset($_POST['ccss']) ) {
    $id = $_POST['post_ID'];
    $css_sheet = $_POST['ccss'];
    
    // no need to keep extra info in db for posts/pages without an extra stylesheet.
    if ($css_sheet != '-1') {
      update_post_meta($id, 'css_sheet', $css_sheet);
    } else {
      delete_post_meta($id, 'css_sheet');
    }
  }
}

function ccss_include() {
  global $wp_query;
  // $id = $wp_query->post->ID;
  $id = get_the_ID();
  $the_sheet  = get_post_meta($id, 'css_sheet','true'); // stylesheet name
  $the_path   = get_stylesheet_directory_uri(); // path to our template folder
  $the_output = $the_path . CCSS_PATH . $the_sheet; // let's create the whole thing
  if ($the_sheet) {
  if (is_single() || is_page())
    wp_enqueue_style('css_sheet', $the_output, TRUE, CCSS_VERSION, 'screen,projection'); 
  }
}

// fetch a list of all custom types so we can assign the dropdown to each one of them
function _ccss_get_post_types()
{
	// Get the post types available
	$types = array();
	$types = get_post_types($args = array(
		'public'   => true
	), 'objects');

	unset($types['attachment']);
	return $types;
}

// oi! wait! where are you going? are you sure? 100%? a second thought? come on let's talk about it. oh well.
function ccss_uninstall() {
			global $wpdb;	
			$wpdb->query($wpdb->prepare("DELETE FROM $wpdb->postmeta WHERE meta_key = 'css_sheet'"));
}

add_action('admin_menu', 'ccss_box');
add_action('save_post', 'ccss_save');
add_action('wp_print_styles','ccss_include',999);
register_uninstall_hook(__FILE__, 'ccss_uninstall');
?>