diff -r 000000000000 -r 03b0d1493584 web/wp-admin/install-helper.php
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/web/wp-admin/install-helper.php	Wed Dec 23 17:55:33 2009 +0000
@@ -0,0 +1,225 @@
+<?php
+/**
+ * Plugins may load this file to gain access to special helper functions for
+ * plugin installation. This file is not included by WordPress and it is
+ * recommended, to prevent fatal errors, that this file is included using
+ * require_once().
+ *
+ * These functions are not optimized for speed, but they should only be used
+ * once in a while, so speed shouldn't be a concern. If it is and you are
+ * needing to use these functions a lot, you might experience time outs. If you
+ * do, then it is advised to just write the SQL code yourself.
+ *
+ * You can turn debugging on, by setting $debug to 1 after you include this
+ * file.
+ *
+ * <code>
+ * check_column('wp_links', 'link_description', 'mediumtext');
+ * if (check_column($wpdb->comments, 'comment_author', 'tinytext'))
+ *     echo "ok\n";
+ *
+ * $error_count = 0;
+ * $tablename = $wpdb->links;
+ * // check the column
+ * if (!check_column($wpdb->links, 'link_description', 'varchar(255)')) {
+ *     $ddl = "ALTER TABLE $wpdb->links MODIFY COLUMN link_description varchar(255) NOT NULL DEFAULT '' ";
+ *     $q = $wpdb->query($ddl);
+ * }
+ *
+ * if (check_column($wpdb->links, 'link_description', 'varchar(255)')) {
+ *     $res .= $tablename . ' - ok <br />';
+ * } else {
+ *     $res .= 'There was a problem with ' . $tablename . '<br />';
+ *     ++$error_count;
+ * }
+ * </code>
+ *
+ * @package WordPress
+ * @subpackage Plugin
+ */
+
+/**
+ * @global bool $wp_only_load_config
+ * @name $wp_only_load_config
+ * @var bool
+ * @since unknown
+ */
+$wp_only_load_config = true;
+
+/** Load WordPress Bootstrap */
+require_once(dirname(dirname(__FILE__)).'/wp-load.php');
+
+/**
+ * Turn debugging on or off.
+ * @global bool|int $debug
+ * @name $debug
+ * @var bool|int
+ * @since unknown
+ */
+$debug = 0;
+
+if ( ! function_exists('maybe_create_table') ) :
+/**
+ * Create database table, if it doesn't already exist.
+ *
+ * @since unknown
+ * @package WordPress
+ * @subpackage Plugin
+ * @uses $wpdb
+ *
+ * @param string $table_name Database table name.
+ * @param string $create_ddl Create database table SQL.
+ * @return bool False on error, true if already exists or success.
+ */
+function maybe_create_table($table_name, $create_ddl) {
+	global $wpdb;
+	foreach ($wpdb->get_col("SHOW TABLES",0) as $table ) {
+		if ($table == $table_name) {
+			return true;
+		}
+	}
+	//didn't find it try to create it.
+	$wpdb->query($create_ddl);
+	// we cannot directly tell that whether this succeeded!
+	foreach ($wpdb->get_col("SHOW TABLES",0) as $table ) {
+		if ($table == $table_name) {
+			return true;
+		}
+	}
+	return false;
+}
+endif;
+
+if ( ! function_exists('maybe_add_column') ) :
+/**
+ * Add column to database table, if column doesn't already exist in table.
+ *
+ * @since unknown
+ * @package WordPress
+ * @subpackage Plugin
+ * @uses $wpdb
+ * @uses $debug
+ *
+ * @param string $table_name Database table name
+ * @param string $column_name Table column name
+ * @param string $create_ddl SQL to add column to table.
+ * @return bool False on failure. True, if already exists or was successful.
+ */
+function maybe_add_column($table_name, $column_name, $create_ddl) {
+	global $wpdb, $debug;
+	foreach ($wpdb->get_col("DESC $table_name",0) as $column ) {
+		if ($debug) echo("checking $column == $column_name<br />");
+
+		if ($column == $column_name) {
+			return true;
+		}
+	}
+	//didn't find it try to create it.
+	$wpdb->query($create_ddl);
+	// we cannot directly tell that whether this succeeded!
+	foreach ($wpdb->get_col("DESC $table_name",0) as $column ) {
+		if ($column == $column_name) {
+			return true;
+		}
+	}
+	return false;
+}
+endif;
+
+/**
+ * Drop column from database table, if it exists.
+ *
+ * @since unknown
+ * @package WordPress
+ * @subpackage Plugin
+ * @uses $wpdb
+ *
+ * @param string $table_name Table name
+ * @param string $column_name Column name
+ * @param string $drop_ddl SQL statement to drop column.
+ * @return bool False on failure, true on success or doesn't exist.
+ */
+function maybe_drop_column($table_name, $column_name, $drop_ddl) {
+	global $wpdb;
+	foreach ($wpdb->get_col("DESC $table_name",0) as $column ) {
+		if ($column == $column_name) {
+			//found it try to drop it.
+			$wpdb->query($drop_ddl);
+			// we cannot directly tell that whether this succeeded!
+			foreach ($wpdb->get_col("DESC $table_name",0) as $column ) {
+				if ($column == $column_name) {
+					return false;
+				}
+			}
+		}
+	}
+	// else didn't find it
+	return true;
+}
+
+/**
+ * Check column matches criteria.
+ *
+ * Uses the SQL DESC for retrieving the table info for the column. It will help
+ * understand the parameters, if you do more research on what column information
+ * is returned by the SQL statement. Pass in null to skip checking that
+ * criteria.
+ *
+ * Column names returned from DESC table are case sensitive and are listed:
+ *      Field
+ *      Type
+ *      Null
+ *      Key
+ *      Default
+ *      Extra
+ *
+ * @since unknown
+ * @package WordPress
+ * @subpackage Plugin
+ *
+ * @param string $table_name Table name
+ * @param string $col_name Column name
+ * @param string $col_type Column type
+ * @param bool $is_null Optional. Check is null.
+ * @param mixed $key Optional. Key info.
+ * @param mixed $default Optional. Default value.
+ * @param mixed $extra Optional. Extra value.
+ * @return bool True, if matches. False, if not matching.
+ */
+function check_column($table_name, $col_name, $col_type, $is_null = null, $key = null, $default = null, $extra = null) {
+	global $wpdb, $debug;
+	$diffs = 0;
+	$results = $wpdb->get_results("DESC $table_name");
+
+	foreach ($results as $row ) {
+		if ($debug > 1) print_r($row);
+
+		if ($row->Field == $col_name) {
+			// got our column, check the params
+			if ($debug) echo ("checking $row->Type against $col_type\n");
+			if (($col_type != null) && ($row->Type != $col_type)) {
+				++$diffs;
+			}
+			if (($is_null != null) && ($row->Null != $is_null)) {
+				++$diffs;
+			}
+			if (($key != null) && ($row->Key  != $key)) {
+				++$diffs;
+			}
+			if (($default != null) && ($row->Default != $default)) {
+				++$diffs;
+			}
+			if (($extra != null) && ($row->Extra != $extra)) {
+				++$diffs;
+			}
+			if ($diffs > 0) {
+				if ($debug) echo ("diffs = $diffs returning false\n");
+				return false;
+			}
+			return true;
+		} // end if found our column
+	}
+	return false;
+}
+
+?>