Create loader.php for plugin

Inserts min qty field and price-per-piece fields in variations and
saves fields as post_meta for each variation

loader.php

@@ -0,0 +1,141 @@
+<?php
+/*
+Plugin Name: Woocommerce Nono Print Pricing
+Plugin URI: http://geek.1bigidea.com/
+Description: Adds new pricing mechanism based on min order qty and per-piece pricing beyond min order qty
+Version: 1.0
+Author: Tom Ransom
+Author URI: http://1bigidea.com
+Network Only: false
+
+Copyright 2013 Tom Ransom (email: transom@1bigidea.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., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+*/
+
+class NonoPrintPricing {
+	private static $_this;
+	var $plugin_slug = "NonoPrintPricing";
+	var $plugin_name = "Nono Print Pricing";
+	var $plugin_version = "1.0";
+
+	var $min_order_key = '_nono_min_order_qty';
+	var $price_per_piece_key = '_nono_price_per_piece';
+
+	function __construct() {
+
+		register_activation_hook(   __FILE__, array( __CLASS__, 'activate'   ) );
+		register_deactivation_hook( __FILE__, array( __CLASS__, 'deactivate' ) );
+
+		add_action('init', array($this, 'init'));
+		add_action('admin_init', array($this, 'admin_init'));
+
+	}
+	function __destruct(){
+	}
+	function activate() {
+		// Add options, initiate cron jobs here
+		register_uninstall_hook( __FILE__, array( __CLASS__, 'uninstall' ) );
+	}
+	function deactivate() {
+		// Remove cron jobs here
+	}
+	function uninstall() {
+		// Delete options here
+	}
+	static function this(){
+		// enables external management of filters/actions
+		// http://hardcorewp.com/2012/enabling-action-and-filter-hook-removal-from-class-based-wordpress-plugins/
+		// enables external management of filters/actions
+		// http://hardcorewp.com/2012/enabling-action-and-filter-hook-removal-from-class-based-wordpress-plugins/
+		// http://7php.com/how-to-code-a-singleton-design-pattern-in-php-5/
+		if( !is_object(self::$_this) ) self::$_this = new NonoPrintPricing();
+
+		return self::$_this;
+	}
+	/*
+	 *	Functions below actually do the work
+	 */
+	function init(){
+
+	}
+
+	function admin_init(){
+		add_action('woocommerce_product_after_variable_attributes', array($this, 'variation_admin'), 10, 3);
+		add_action('woocommerce_save_product_variation', array($this, 'save_pricing_info') );
+	}
+	/**
+	 *	Display fields for Min Qty and Price per Piece
+	 */
+	function variation_admin($loop, $variation_data, $variation){
+
+		$_min_qty = get_post_meta($variation->ID, $this->min_order_key, true);
+		$_per_piece_price = get_post_meta($variation->ID, $this->price_per_piece_key, true);
+?>
+		<tr>
+			<td>
+				<div>
+					<label><?php _e( 'Min Qty:', 'nono-print-pricing' ); ?> <a class="tips" data-tip="<?php _e( 'Minimum number of pieces at above price', 'nono-print-pricing' ); ?>" href="#">[?]</a></label>
+					<input type="number" size="5" name="variable_min_qty[<?php echo $loop; ?>]" value="<?php if ( isset( $_min_qty ) ) echo esc_attr( $_min_qty ); ?>" />
+				</div>
+			</td>
+			<td>
+				<div>
+					<label><?php echo __( 'Price per piece:', 'nono-print-pricing' ) . ' ('.get_woocommerce_currency_symbol().')'; ?></label>
+					<input type="number" size="5" name="variable_per_piece_price[<?php echo $loop; ?>]" value="<?php if ( isset( $_per_piece_price ) ) echo number_format( $_per_piece_price, 2, '.', '' ); ?>" step="any" min="0" placeholder="<?php _e( 'Per piece price (required)', 'nono-print-pricing' ); ?>" />
+				</div>
+			</td>
+		</tr>
+<?php
+	}
+	function save_pricing_info($variation_id){
+
+		$variation_ids = $_POST['variable_post_id'];
+
+		$index = array_search($variation_id, $_POST['variable_post_id']);
+
+		if( false === $index ) return;
+
+		update_post_meta($variation_id, $this->min_order_key, absint($_POST['variable_min_qty'][$index]) );
+		update_post_meta($variation_id, $this->price_per_piece_key, (float) $_POST['variable_per_piece_price'][$index]);
+	}
+}
+
+if ( ! class_exists( 'Autoload_WP' ) ) {
+	/**
+	 * Generic autoloader for classes named in WordPress coding style.
+	 */
+	class Autoload_WP {
+
+		public $dir = __DIR__;
+
+		function __construct( $dir = '' ) {
+
+			if ( ! empty( $dir ) )
+				$this->dir = $dir;
+
+			spl_autoload_register( array( $this, 'spl_autoload_register' ) );
+		}
+
+		function spl_autoload_register( $class_name ) {
+
+			$class_path = $this->dir . '/class-' . strtolower( str_replace( '_', '-', $class_name ) ) . '.php';
+
+			if ( file_exists( $class_path ) )
+				include $class_path;
+		}
+	}
+}
+new NonoPrintPricing();