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From <Jan.Mate...@rzf.fin-nrw.de>
Subject AW: AW: a task for selecting among possible options?
Date Tue, 21 Jul 2009 13:14:42 GMT
Because you always configure file+value with the same value you could tune it:

<macrodef name="check">
    <attribute name="property"/>
    <attribute name="file"/>
    <sequential>
        <available property="@{property}" file="@{file}" value="@{file}"/>
    </sequential>
</macrodef> 
<check property="foo" file="foo.txt"/>
<check property="foo" file="${env.FOO}"/>
...



Jan

>-----Urspr√ľngliche Nachricht-----
>Von: Michael George [mailto:mdgeorge@cs.cornell.edu] 
>Gesendet: Dienstag, 21. Juli 2009 14:17
>An: Ant Users List
>Betreff: Re: AW: a task for selecting among possible options?
>
>Oh my god that's so much simpler than what I was doing.  Thanks!
>
>--Mike
>
>Jan.Materne@rzf.fin-nrw.de wrote:
>> <available property="foo" file="foo.txt" value="foo.txt"/> 
>> <available property="foo" file="${env.FOO}" value="${env.FOO}/>
>> ... more available tasks
>>
>> Because properties are immutable the first hit wins.
>>
>>
>> Jan
>>
>>
>>
>>   
>>> -----Urspr√ľngliche Nachricht-----
>>> Von: Michael George [mailto:mdgeorge@cs.cornell.edu] 
>>> Gesendet: Freitag, 17. Juli 2009 04:45
>>> An: user@ant.apache.org
>>> Betreff: a task for selecting among possible options?
>>>
>>> Hello,
>>>
>>> I'm trying to clean up our build process, and one of the 
>problems is 
>>> that everyone on the team uses a different configuration mechanism 
>>> (environment vars, properties files, manual config,...).  
>In trying to 
>>> be backwards compatible with everyone's process I find I 
>would like a 
>>> task that sets a property by selecting the first valid item 
>>>     
>> >from a list 
>>   
>>> of possibilities.  For example, I'd like to able to write 
>>> something like
>>>
>>>
>>> <choice property="foo">
>>>  <condition> <available file="@{}/foo.txt" /> </condition>
>>>
>>>  <option value="${env.FOO}" />
>>>  <option value="${basedir}/foo" />
>>>  <option>
>>>    <dirset dir="/usr" includes="**/foo*"/>
>>>    </option>
>>> </choice>
>>>
>>> To mean "set foo to the first of env.FOO, ${basedir}/foo, and 
>>> /usr/*/foo 
>>> that contains the file foo.txt."  I'd also like to perhaps have the 
>>> option of prompting the user if multiple valid choices are 
>found (for 
>>> example, with select="first" or select="prompt").
>>>
>>> Does anyone know of any tasks that would make this kind of 
>>> configuration 
>>> easy, before I dive in and try to write one myself?  If not, would 
>>> people find this useful if I code it up and submit it to 
>ant-contrib?
>>>
>>> Thanks!
>>>
>>> --Mike
>>>
>>> 
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>>>     
>>
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>
>
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