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From: Dominique Devienne <DDevienne@lgc.com>
To: "'Ant Users List'" <user@ant.apache.org>
Subject: RE: Apply task and missing directories
Date: Wed, 21 Jul 2004 09:27:14 -0500
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> From: Nicolas Girard [mailto:Nicolas.Girard@IReS.in2p3.fr]
> 
> Hi all,
> i'm trying to automate the generation of png images from dia diagrams.
> The idea is to regularly update a cvs sandbox ; then, if one .dia file
> is newer than the associated .png file, i'd just like to launch dia
> using the 'apply' task.
> 
> Here's a subset of the script:
>   <target name="GenerateImagesFromDiaDiagrams">
>       <mkdir dir="${build.design}"/>
>       <apply executable="dia" dest="${build.design}">
>         <arg value="-e"/>
>         <targetfile/>
>         <srcfile/>
>         <fileset dir="${src.design}" includes="**/*.dia"/>
>         <mapper type="glob" from="*.dia" to="*.png"/>
>       </apply>
>   </target>
> 
> As you can see, I'd like the .png images to be generated into the
> build.design directory, which is different from the src.design directory
> where the srcfiles remain.
> 
> Here's my problem: when dealing with, say file
> '${src.design}/a/b/test.dia', I get an error message because the output
> directory '${build.design}/a/b/' doesn't exist.
> 
> So far I couldn't find an elegant way of creating the missing output
> directory before the external program is launched.
> 
> Do you have an idea on how to achieve this ?

Interesting. Sounds like you could do it with Ant-Contrib's <for> which can
accept a <fileset> to iterate on (I think), then <dirname> to extract the
directory, then Ant-Contrib's <propertyregexp> to simulate the mapper, then
<mkdir> to create the re-parented directory name.

Another option might be to use Ant-Contrib's <outofdate> with your fileset
as source file, and a mapper that extracts either the target .png file, or
if possible directly the target directory of the .png, and then does a <for>
over these directories. In theory, we'd loop only over the directory you
need to add, by extracting the out-of-date target files (with <outofdate>
allows you to do).

The last option is to write a <script>, which wouldn't be very difficult.

A long time ago, I proposed (and used coded) allowing to pass a <dirset> to
<mkdir>, but this wasn't accepted. If <mkdir> accepted a <dirset>, with a
nested mapper, then you'd have a ready made solution ;-)

None of the above has been tested. Just my thoughts on what I'd try in your
shoes. --DD

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