Plugin Checker for the WP customizer. Drop it in your themes!

of-customize-plugin-check.php

<?php
/**
 * Plugin Check for the WP customizer
 * Inspired by http://ottopress.com/2012/themeplugin-dependencies/ & http://ottopress.com/2013/slides-a-presentation-theme/
 *
 * Of Desks Studio Inc.
 *
 * Example:

	$wp_customize->add_section( 'plugins', array(
		'title'    => __( 'Recommended Plugins', 'theme_name' ),
	) );

	$wp_customize->add_setting( 'recommended_plugin');
	$wp_customize->add_control( new Of_Customize_Plugin_Check_Control( $wp_customize, 'recommended_plugin', array(
		'section'  => 'plugins',
		'settings' => 'recommended_plugin',
		'plugins'  => array (
			'wp-org-slug' => 'plugin_dir/plugin_file.php',
			'media-ep' => 'media-ep/media-ep.php',
		)
	) ) );

 */

if ( class_exists( 'WP_Customize_Control' ) ) :
class Of_Customize_Plugin_Check_Control extends WP_Customize_Control {

	/**
	 * @access public
	 * @var array
	 */
	public $plugins = array();

	/**
	 * @access private
	 * @var array
	 */
	private $installed_plugins;

	/**
	 * Render Tool Tip
	 *
	 * Set "plugins" to display your tool tip.
	 *
	 * @return  void
	 */
	public function render_content() {

		require_once ABSPATH . 'wp-admin/includes/plugin-install.php';

		$this->installed_plugins = get_plugins();

		foreach ( $this->plugins as $plugin_slug => $plugin_file ) {

			$plugin_info = plugins_api( 'plugin_information', array( 'slug' => $plugin_slug ) );

			if ( ! is_wp_error( $plugin_info ) ) {

				if ( ! isset( $this->installed_plugins[$plugin_file] ) ) {
					// Is it installed?
					echo '<div class="error">';
					echo "<p>{$plugin_info->name} is <strong>not installed</strong></p><p><strong><a href=\"" . wp_nonce_url( self_admin_url( 'update.php?action=install-plugin&plugin=' . $plugin_slug ), 'install-plugin_' . $plugin_slug ) . '">Install it</a></strong></p>';
					echo '</div>';

				} else if ( is_plugin_inactive( $plugin_file ) ) {
					// Is it activated?
					echo '<div class="error">';
					echo "<p>{$plugin_info->name} is <strong>installed</strong></p><p><strong><a href=\"" . wp_nonce_url( self_admin_url( 'plugins.php?action=activate&plugin=' . $plugin_file ), 'activate-plugin_' . $plugin_file ). '">Activate it</a></strong></p>';
					echo '</div>';

				} else {
					// Must be good!
					echo '<div class="updated">';
					echo "<p>{$plugin_info->name} is <strong>activated</strong></p>";
					echo '</div>';
				}

			}
		}
	}
}
endif;