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: 4.7.0
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://fontawesome.io

License:

Copyright (C) 2013 - 2016 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/>.
 */

/**
 * Constants
 */
define('FONTAWESOME_VERSION', '4.7.0');

function fntawe_register_plugin_styles()
{
    global $wp_styles;

    wp_enqueue_style('font-awesome-styles', plugins_url('assets/css/font-awesome.css', __FILE__), array(), FONTAWESOME_VERSION, 'all');
}
add_action('wp_enqueue_scripts', 'fntawe_register_plugin_styles');
add_action('admin_enqueue_scripts', 'fntawe_register_plugin_styles');

function fntawe_setup_shortcode($params)
{
    return '<i class="fa fa-' . esc_attr($params['name']) . '">&nbsp;</i>';
}
add_shortcode('icon', 'fntawe_setup_shortcode');

add_filter('widget_text', 'do_shortcode');

function fntawe_add_tinymce_hooks()
{
    if ((current_user_can('edit_posts') || current_user_can('edit_pages')) && get_user_option('rich_editing')) {
        add_filter('mce_external_plugins', 'fntawe_register_tinymce_plugin');
        add_filter('mce_buttons', 'fntawe_add_tinymce_buttons');
        add_filter('teeny_mce_buttons', 'fntawe_add_tinymce_buttons');
        add_filter('mce_css', 'fntawe_add_tinymce_editor_sytle');
    }
}
add_action('admin_init', 'fntawe_add_tinymce_hooks');

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

    return $plugin_array;
}

function fntawe_add_tinymce_buttons($buttons = array())
{
    $buttons = (array) $buttons;
    array_push($buttons, '|', 'font_awesome_glyphs');

    return $buttons;
}

function fntawe_add_tinymce_editor_sytle($mce_css)
{
    $mce_css .= ', ' . plugins_url('assets/css/font-awesome.min.css', __FILE__);

    return $mce_css;
}