From 5bfabcf2d3165c49941ed3ab5a0a837d58ac42a1 Mon Sep 17 00:00:00 2001
From: Ryan Boren <ryan@git.wordpress.org>
Date: Wed, 23 May 2007 22:03:24 +0000
Subject: [PATCH] wp_delete_term().  see #4189

git-svn-id: https://develop.svn.wordpress.org/trunk@5533 602fd350-edb4-49c9-b593-d223f7449a82
---
 wp-admin/admin-db.php    | 46 +++-------------------------------
 wp-includes/taxonomy.php | 54 +++++++++++++++++++++++++++++++++++++++-
 2 files changed, 57 insertions(+), 43 deletions(-)

diff --git a/wp-admin/admin-db.php b/wp-admin/admin-db.php
index 8cd708b9b5..d1bb017400 100644
--- a/wp-admin/admin-db.php
+++ b/wp-admin/admin-db.php
@@ -150,51 +150,13 @@ function wp_delete_category($cat_ID) {
 	global $wpdb;
 
 	$cat_ID = (int) $cat_ID;
-	$default_cat = get_option('default_category');
-	$default_link_cat = get_option('default_link_category');
+	$default = get_option('default_category');
 
-	// Don't delete either of the default cats
-	if ( $cat_ID == $default_cat || $cat_ID == $default_link_cat )
+	// Don't delete the default cat
+	if ( $cat_ID == $default )
 		return 0;
 
-	$category = get_category($cat_ID);
-
-	$parent = $category->category_parent;
-
-	// Delete the category if it is not also a tag.
-	if ( 0 == ($category->type & TAXONOMY_TAG) ) {
-		if ( !$wpdb->query("DELETE FROM $wpdb->categories WHERE cat_ID = '$cat_ID'") )
-			return 0;
-	} else {
-		$wpdb->query("UPDATE $wpdb->categories SET type = type & ~" . TAXONOMY_CATEGORY . " WHERE cat_ID = '$cat_ID'");
-	}
-	// Update children to point to new parent
-	$wpdb->query("UPDATE $wpdb->categories SET category_parent = '$parent' WHERE category_parent = '$cat_ID'");
-
-	// Only set posts and links to the default category if they're not in another category already
-	$posts = $wpdb->get_col("SELECT post_id FROM $wpdb->post2cat WHERE category_id='$cat_ID' AND rel_type = 'category'");
-	foreach ( (array) $posts as $post_id ) {
-		$cats = wp_get_post_categories($post_id);
-		if ( 1 == count($cats) )
-			$cats = array($default_cat);
-		else
-			$cats = array_diff($cats, array($cat_ID));
-		wp_set_post_categories($post_id, $cats);
-	}
-
-	$links = $wpdb->get_col("SELECT link_id FROM $wpdb->link2cat WHERE category_id='$cat_ID'");
-	foreach ( (array) $links as $link_id ) {
-		$cats = wp_get_link_cats($link_id);
-		if ( 1 == count($cats) )
-			$cats = array($default_link_cat);
-		else
-			$cats = array_diff($cats, array($cat_ID));
-		wp_set_link_cats($link_id, $cats);
-	}
-
-	clean_category_cache($cat_ID);
-	do_action('delete_category', $cat_ID);
-	return 1;
+	return wp_delete_term($cat_ID, 'category', "default=$default");
 }
 
 function wp_create_category($cat_name) {
diff --git a/wp-includes/taxonomy.php b/wp-includes/taxonomy.php
index 6951ff48c5..8aac37e46a 100644
--- a/wp-includes/taxonomy.php
+++ b/wp-includes/taxonomy.php
@@ -20,6 +20,14 @@ function get_taxonomy( $taxonomy ) {
 	return $wp_taxonomies[$taxonomy];
 }
 
+function is_taxonomy_hierarchical($taxonomy) {
+	if ( ! is_taxonomy($taxonomy) )
+		return false;
+
+	$taxonomy = get_taxonomy($taxonomy);
+	return $taxonomy['hierarchical'];
+}
+
 function register_taxonomy( $taxonomy, $object_type, $args = array() ) {
 	global $wp_taxonomies;
 
@@ -98,7 +106,51 @@ function wp_insert_term( $term, $taxonomy, $args = array() ) {
 /**
  * Removes a term from the database.
  */
-function wp_delete_term() {}
+function wp_delete_term( $term, $taxonomy, $args = array() ) {
+	global $wpdb;
+
+	$term = (int) $term;
+
+	if ( ! $ids = is_term($term, $taxonomy) )
+		return false;
+	$tt_id = $ids['term_taxonomy_id'];
+
+	$defaults = array();
+	$args = wp_parse_args($args, $defaults);
+	extract($args);
+
+	if ( isset($default) ) {
+		$default = (int) $default;
+		if ( ! is_term($default, $taxonomy) )
+			unset($default);
+	}
+
+	// Update children to point to new parent
+	if ( is_taxonomy_hierarchical($taxonomy) ) {
+		$term_obj = get_term($term, $taxonomy);
+		$parent = $term_obj->parent;
+
+		$wpdb->query("UPDATE $wpdb->term_taxonomy SET parent = '$parent' WHERE parent = '$term_obj->term_id' AND taxonomy = '$taxonomy'");
+	}
+
+	$objects = $wpdb->get_col("SELECT object_id FROM $wpdb->term_relationships WHERE term_taxonomy_id = '$tt_id'");
+
+	foreach ( (array) $objects as $object ) {
+		$terms = get_object_terms($object, $taxonomy, 'get=ids');
+		if ( 1 == count($terms) && isset($default) )
+			$terms = array($default);
+		else
+			$terms = array_diff($terms, array($term));
+		wp_set_object_terms($object, $terms, $taxonomy);
+	}
+
+	$wpdb->query("DELETE FROM $wpdb->term_taxonomy WHERE term_taxonomy_id = '$tt_id'");
+
+	//clean_term_cache($term, $taxonomy);
+	do_action("delete_$taxonomy", $term, $tt_id);
+
+	return true;
+}
 
 function wp_update_term( $term, $taxonomy, $args = array() ) {
 	global $wpdb;