wp-revisions-control.php

<?php
/*
Plugin Name: WP Revisions Control
Plugin URI: https://ethitter.com/plugins/wp-revisions-control/
Description: Control how many revisions are stored for each post type
Author: Erick Hitter
Version: 1.2.1
Author URI: https://ethitter.com/
Text Domain: wp_revisions_control
Domain Path: /languages/

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
*/

class WP_Revisions_Control {
	/**
	 * Singleton
	 */
	private static $__instance = null;

	/**
	 * Class variables
	 */
	private static $priority = null; // use $this->plugin_priority()
	private $priority_default = 50;

	private static $post_types = array(); // use $this->get_post_types()
	private static $settings = array(); // use $this->get_settings()

	private $settings_page = 'writing';
	private $settings_section = 'wp_revisions_control';

	private $meta_key_limit = '_wp_rev_ctl_limit';

	/**
	 * Silence is golden!
	 */
	private function __construct() {}

	/**
	 * Singleton implementation
	 *
	 * @uses self::setup
	 * @return object
	 */
	public static function get_instance() {
		if ( ! is_a( self::$__instance, __CLASS__ ) ) {
			self::$__instance = new self;

			self::$__instance->setup();
		}

		return self::$__instance;
	}

	/**
	 * Register actions and filters at `init` so others can interact, if desired.
	 *