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From <Jan.Mate...@rzf.fin-nrw.de>
Subject AW: Asking for new feature: Self-Discovery of service to make Ant a real extensible system
Date Tue, 02 May 2006 05:28:00 GMT
Another point for using namespaces.
Which <if> should be loaded if you have ant-contrib AND antelope?
With ns you could load both without any conflicts.

Jan 

>-----Urspr√ľngliche Nachricht-----
>Von: Matt Benson [mailto:gudnabrsam@yahoo.com] 
>Gesendet: Dienstag, 2. Mai 2006 00:13
>An: Ant Users List
>Betreff: Re: Asking for new feature: Self-Discovery of service 
>to make Ant a real extensible system
>
>--- Steve Loughran <stevel@apache.org> wrote:
>[SNIP]
>> I've taken to declaring macros/presets in their own ns too.
>
>I envision a world where this is not considered remarkable.  
>Macros, presets, and scripts are good for rapid prototyping, 
>but if a task can be composed of other tasks in Java, what is 
>less correct about the composite task being written in "Ant"?  
>I consider the following a good example of something cool to 
>do with ns'd presets:  at my last job we had loads of legacy 
>stuff using Btrieve databases.  In trademark gross abuse of 
>Ant I used it for all kinds of utility jobs in our final 
>conversion away from all that. 
>Historically Btrieve has been used a lot through a 
>command-line utility called BUTIL.  So I created a BUTIL 
>antlib along the lines of:
>
><presetdef name="create">
>  <apply executable="BUTIL"
>         failifexecutionfails="true">
>    <arg value="-CREATE" />
>    <targetfile />
>    <srcfile />
>  </apply>
></presetdef>
>
><presetdef name="copy">
>  <apply executable="BUTIL"
>         failifexecutionfails="true">
>    <arg value="-COPY" />
>    <srcfile />
>    <targetfile />
>  </apply>
></presetdef>
>
>and so on for whichever options I needed...
>
>so what would have been (in a batch file): 
>  BUTIL -CREATE merged.btr merged.des
>  FOR %%X in (foo.btr bar.btr) do (
>    BUTIL -COPY %%X merged.btr
>  )
>
>comfortably became (declaring the "butil" ns in the calling buildfile):
>
><butil:create>
>  <fileset file="merged.des" />
>  <mapper type="glob" from="*.des" to="*.btr" /> </butil:create>
>
><butil:copy>
>  <fileset dir="${basedir}" includes="*.btr" />
>  <mapper type="merge" to="merged.btr" /> </butil:copy>
>
>i.e. those familiar with the command-line tool would have no 
>problem understanding what was going on...
>
>anyway...
>
>-Matt
>
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