Return-Path: <bodewig@bost.de>
Mailing-List: contact ant-dev-help@jakarta.apache.org; run by ezmlm
Delivered-To: mailing list ant-dev@jakarta.apache.org
Received: (qmail 4087 invoked from network); 27 Sep 2000 06:48:12 -0000
Received: from public.ndh.net (HELO public.ndh.com) (195.94.90.21)
  by locus.apache.org with SMTP; 27 Sep 2000 06:48:12 -0000
Received: from sbodewig.bost.de ([195.227.98.11]) by public.ndh.com
 (8.9.3/8.8.0) with ESMTP id IAA08758 for <ant-dev@jakarta.apache.org>;
 Wed, 27 Sep 2000 08:48:10 +0200 (MET DST)
Received: (from bodewig@localhost)
	by sbodewig.bost.de (8.9.3/8.9.3) id IAA01814;
	Wed, 27 Sep 2000 08:48:12 +0200
X-Authentication-Warning: sbodewig.bost.de: bodewig set sender to
 bodewig@bost.de using -f
To: ant-dev@jakarta.apache.org
Subject: Re: <require>, <fail unless="..."> or <available fail="...">
References: <20000926164951.3584.qmail@web116.yahoomail.com>
From: Stefan Bodewig <bodewig@bost.de>
Date: 27 Sep 2000 08:48:12 +0200
In-Reply-To: Diane Holt's message of "Tue, 26 Sep 2000 09:49:51 -0700 (PDT)"
Message-ID: <m31yy672kz.fsf@sbodewig.bost.de>
Lines: 39
User-Agent: Gnus/5.0807 (Gnus v5.8.7) XEmacs/21.1 (Capitol Reef)
MIME-Version: 1.0
Content-Type: text/plain; charset=us-ascii
X-Spam-Rating: locus.apache.org 1.6.2 0/1000/N

>>>>> "DH" == Diane Holt <holtdl@yahoo.com> writes:

 DH> While we're on this topic, I'd like to check that I'm using the
 DH> <available>/if/unless, as they currently exist, the way you're
 DH> supposed to be.

Does your example actually work? Well, if it does, I think you are
doing far more than you need to (by using the <ant> task). My version
would look like this:

<project default="widget" basedir=".">

  <target name="test.widget">
    <available classname="Widget"
               property="widget.available">
      <classpath>
        <pathelement location="${user.home}"/>
      </classpath>
    </available>
  </target>

  <target name="noWidget" depends="test.widget" unless="widget.available">
    <echo message=""/>
    <echo message="******* Widget not available *******"/>
    <echo message="***** Run compile target first *****"/>
    <echo message=""/>
  </target>

  <target name="doWidget" depends="test.widget" if="widget.available">
    <echo message="Executing widget target..."/>
  </target>

  <target name="widget" depends="doWidget,noWidget" />
</project>

This isn't really shorter but saves you from the overhead of creating
another Project instance.

Stefan