plugin.php

<?php
/*
Plugin Name: Font Awesome Icons
Plugin URI: http://www.rachelbaker.me
Description: Use the Font Awesome icon set within WordPress. Icons can be inserted using either HTML or a shortcode.
Version: 3.2.1
Author: Rachel Baker
Author URI: http://rachelbaker.me/font-awesome-icons-wordpress-plugins/
Author Email: rachel@rachelbaker.me
Credits:
    The Font Awesome icon set was created by Dave Gandy (dave@davegandy.com)
     http://fortawesome.github.com/Font-Awesome/

License:

  Copyright (C) 2013  Rachel Baker

    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 3 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, see <http://www.gnu.org/licenses/>.

*/

class FontAwesome {
    private static $instance;
    const VERSION = '3.2.1';

    private static function has_instance() {
        return isset(self::$instance) && self::$instance != null;
    }

    public static function get_instance() {
        if (!self::has_instance())
            self::$instance = new FontAwesome;
        return self::$instance;
    }

    public static function setup() {
        self::get_instance();
    }

    protected function __construct() {
        if (!self::has_instance()) {
            add_action('init', array(&$this, 'init'));
        }
    }

    public function init() {
        add_action('wp_enqueue_scripts', array(&$this, 'register_plugin_styles'));
        add_action('admin_enqueue_scripts', array(&$this, 'register_plugin_styles'));
        add_shortcode('icon', array($this, 'setup_shortcode'));
        add_filter('widget_text', 'do_shortcode');

        if ((current_user_can('edit_posts') || current_user_can('edit_pages')) &&
                get_user_option('rich_editing')) {
            add_filter('mce_external_plugins', array(&$this, 'register_tinymce_plugin'));
            add_filter('mce_buttons', array(&$this, 'add_tinymce_buttons'));
            add_filter('mce_css', array(&$this, 'add_tinymce_editor_sytle'));
        }
    }

    public function register_plugin_styles() {
        global $wp_styles;
        wp_enqueue_style('font-awesome-styles', plugins_url('assets/css/font-awesome.min.css', __FILE__), array(), self::VERSION, 'all');
        wp_enqueue_style('font-awesome-ie7', plugins_url('assets/css/font-awesome-ie7.min.css', __FILE__), array(), self::VERSION, 'all');
        $wp_styles->add_data('font-awesome-ie7', 'conditional', 'lte IE 7');
    }

    public function setup_shortcode($params) {
        extract(shortcode_atts(array(
                    'name'  => '',
                ), $params));

        return '<i class="' . $params['name'] . '">&nbsp;</i>';
    }

    public function register_tinymce_plugin($plugin_array) {
        $plugin_array['font_awesome_glyphs'] = plugins_url('assets/js/font-awesome.js', __FILE__);

        return $plugin_array;
    }

    public function add_tinymce_buttons($buttons) {
        array_push($buttons, '|', 'fontAwesomeGlyphSelect');

        return $buttons;
    }

    public function add_tinymce_editor_sytle($mce_css) {
        $mce_css .= ', ' . plugins_url('assets/css/admin/editor_styles.css', __FILE__);

        return $mce_css;
    }
}

FontAwesome::setup();