From 467ae14ca26b3690eb73e62c9495f11c921ed205 Mon Sep 17 00:00:00 2001
From: Platonides <platonides@users.mediawiki.org>
Date: Thu, 17 Mar 2011 15:51:19 +0000
Subject: [PATCH] Add hook InterwikiLoadPrefix

---
 docs/hooks.txt         |  6 ++++++
 includes/Interwiki.php | 16 ++++++++++++----
 2 files changed, 18 insertions(+), 4 deletions(-)

diff --git a/docs/hooks.txt b/docs/hooks.txt
index f3e9fa35db..1feec0c2d0 100644
--- a/docs/hooks.txt
+++ b/docs/hooks.txt
@@ -962,6 +962,12 @@ $ignoreRedirect: boolean to skip redirect check
 $target: Title/string of redirect target
 $article: Article object
 
+'InterwikiLoadPrefix': When resolving if a given prefix is an interwiki or not.
+Return true without providing an interwiki to continue interwiki search.
+$prefix: interwiki prefix we are looking for.
+&$iwData: output array describing the interwiki with keys iw_url, iw_local, 
+  iw_trans and optionally iw_api and iw_wikiid.
+
 'InternalParseBeforeLinks': during Parser's internalParse method before links
 but after noinclude/includeonly/onlyinclude and other processing.
 &$parser: Parser object
diff --git a/includes/Interwiki.php b/includes/Interwiki.php
index 84f268662c..05412f0fd7 100644
--- a/includes/Interwiki.php
+++ b/includes/Interwiki.php
@@ -141,11 +141,19 @@ class Interwiki {
 	 */
 	protected static function load( $prefix ) {
 		global $wgMemc, $wgInterwikiExpiry;
-		$key = wfMemcKey( 'interwiki', $prefix );
-		$mc = $wgMemc->get( $key );
 
-		if( $mc && is_array( $mc ) ) { // is_array is hack for old keys
-			$iw = Interwiki::loadFromArray( $mc );
+		$iwData = false;
+		if ( !wfRunHooks('InterwikiLoadPrefix', array( $prefix, &$iwData ) ) ) {
+			return Interwiki::loadFromArray( $iwData );
+		}
+
+		if ( !$iwData ) {
+			$key = wfMemcKey( 'interwiki', $prefix );
+			$iwData = $wgMemc->get( $key );
+		}
+
+		if( $iwData && is_array( $iwData ) ) { // is_array is hack for old keys
+			$iw = Interwiki::loadFromArray( $iwData );
 			if( $iw ) {
 				return $iw;
 			}
-- 
2.20.1