Split 'db.php' so it is now just some kind of a 'bootloader'

The 'pg4wp' directory should be put in 'wp-content' instead of 'wp-content/plugins' (which is still supported)

git-svn-id: https://plugins.svn.wordpress.org/postgresql-for-wordpress/trunk@418484 b8457f37-d9ea-0310-8a92-e5e31aec5664

pg4wp/core.php

@@ -0,0 +1,36 @@
+<?php
+/**
+ * @package PostgreSQL_For_Wordpress
+ * @version $Id$
+ * @author	Hawk__, www.hawkix.net
+ */
+
+/**
+* This file does all the initialisation tasks
+*/
+
+// Logs are put in the pg4wp directory
+define( 'PG4WP_LOG', PG4WP_ROOT.'/logs/');
+// Check if the logs directory is needed and exists or create it if possible
+if( (PG4WP_DEBUG || PG4WP_LOG_ERRORS) &&
+	!file_exists( PG4WP_LOG) &&
+	is_writable(dirname( PG4WP_LOG)))
+	mkdir( PG4WP_LOG);
+
+// Load the driver defined in 'db.php'
+require_once( PG4WP_ROOT.'/driver_'.DB_DRIVER.'.php');
+
+// This loads up the wpdb class applying appropriate changes to it
+$replaces = array(
+	'define( '	=> '// define( ',
+	'class wpdb'	=> 'class wpdb2',
+	'new wpdb'	=> 'new wpdb2',
+	'mysql_'	=> 'wpsql_',
+	'<?php'		=> '',
+	'?>'		=> '',
+);
+eval( str_replace( array_keys($replaces), array_values($replaces), file_get_contents(ABSPATH.'/wp-includes/wp-db.php')));
+
+// Create wpdb object if not already done
+if (! isset($wpdb))
+	$wpdb = new wpdb2( DB_USER, DB_PASSWORD, DB_NAME, DB_HOST );