use plugin:available instead of the old jelly script (bugged)

git-svn-id: https://svn.apache.org/repos/asf/maven/maven-1/plugins/trunk@289263 13f79535-47bb-0310-9956-ffa450edef68

jdiff/plugin.jelly

@@ -1,7 +1,7 @@
 <?xml version="1.0"?>
 <!-- 
 /*
- * Copyright 2001-2004 The Apache Software Foundation.
+ * Copyright 2001-2005 The Apache Software Foundation.
  * 
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -23,19 +23,11 @@
   xmlns:maven="jelly:maven"
   xmlns:doc="doc"
   xmlns:scm="scm"
+  xmlns:plugin="plugin"
   xmlns:ant="jelly:ant">
 
   <j:if test="${bootstrapping == null}">
-    <!-- Poor mans version check - plugin dependencies still suck for multiple versions -->
-    <maven:get plugin="maven-scm-plugin" property="plugin" var="scmPlugin" />
-    <j:if test="${empty(scmPlugin) or scmPlugin.currentVersion.compareTo('1.5') lt 0}">
-      <ant:fail>
-        Must have SCM plugin v1.5 installed to use this version of the jdiff plugin.
-        Try: maven plugin:download -DgroupId=maven -DartifactId=maven-scm-plugin -Dversion=1.5
-        You can find the latest version of the SCM plugin on the Maven Download page at
-        http://maven.apache.org/start/download.html
-      </ant:fail>
-    </j:if>
+    <plugin:available groupId="maven" artifactId="maven-scm-plugin" minRelease="1.5" neededBy="maven-jdiff-plugin"/>
   </j:if>
 
   <goal name="maven-jdiff-plugin:register">