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From "Antoine Levy-Lambert" <anto...@gmx.de>
Subject Re: Empty arguments on the command-line under windows
Date Thu, 01 Sep 2005 08:13:01 GMT
Hello Martin,

you can, using the condition task, set registry.cache.dir to &quot;&quot;
only when running under windows.

Hopes this helps,

Antoine

> --- Urspr√ľngliche Nachricht ---
> Von: Martin Senger <senger@ebi.ac.uk>
> An: Ant Users List <user@ant.apache.org>
> Betreff: Re: Empty arguments on the command-line under windows
> Datum: Thu, 1 Sep 2005 08:25:40 +0100 (BST)
> 
> > This (condition task invocation) rewrites more simply :
> > 
> > <property name="registry.cache.dir" value=""/>
> > because ant only assigns a value to unexisting properties.
> >
>    You are, of course, completely right (thanks also to Ninju Bohra who
> pointed to this, as well). I know that but sometimes I forget. Thanks...
> 
> > To solve your Windows problem, you can do :
> > <property name="registry.cache.dir" value="&quot;&quot;"/>
> > this might lead Windows to understand that there is an empty argument
> >
>    This is not bad (and I may use it, after all), but still it is not
> OS-independent. Because linux takes literally what is there - so it takes
> quotes as part of the parameters, windows does not. But at least, windows
> let it as a parameter, so I can teach my program to take two double
> quotes as an empty value.
>    This is what it does:
> The Ant task is now:
> 
>      <property name="my.property" value="&quot;&quot;"/>
> 
>      <java classname="TestArgs" taskname="testing"
>        classpathref="build.classpath" fork="true" failonerror="true">
>        <arg value="-cacheDir"/>
>        <arg value="${my.property}"/>
>        <arg value="-dt"/>
>      </java>
> 
>    This is an output (of a simple program that prints its argumenst) under
> windows, if I do not set my.property:
> 
>   [testing] 0: -cacheDir
>   [testing] 1: abc
>   [testing] 2: -dt
> 
>    And the same under linux:
> 
>   [testing] 0: -cacheDir
>   [testing] 1: ""
>   [testing] 2: -dt
> 
>    I have feeling (but I may be wrong) that this kind of
> OS-interoperability should be solved by Ant...
> 
>    Thanks, Martin

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