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="${env.FOO}"/>
...
Jan
>-----Ursprüngliche Nachricht-----
>Von: Michael George [mailto:mdgeo...@cs.cornell.edu]
>Gesendet: Dienstag, 21. Juli 2009 14:17
>An: Ant Users List
>Betreff: Re: AW: a task for selecting among possible options?
>
>Oh my god that's so much simpler than what I was doing. Thanks!
>
>--Mike
>
>jan.mate...@rzf.fin-nrw.de wrote:
>> <available property="foo" file="foo.txt" value="foo.txt"/>
>> <available property="foo" file="${env.FOO}" value="${env.FOO}/>
>> ... more available tasks
>>
>> Because properties are immutable the first hit wins.
>>
>>
>> Jan
>>
>>
>>
>>
>>> -----Ursprüngliche Nachricht-----
>>> Von: Michael George [mailto:mdgeo...@cs.cornell.edu]
>>> Gesendet: Freitag, 17. Juli 2009 04:45
>>> An: user@ant.apache.org
>>> Betreff: a task for selecting among possible options?
>>>
>>> Hello,
>>>
>>> I'm trying to clean up our build process, and one of the
>problems is
>>> that everyone on the team uses a different configuration mechanism
>>> (environment vars, properties files, manual config,...).
>In trying to
>>> be backwards compatible with everyone's process I find I
>would like a
>>> task that sets a property by selecting the first valid item
>>>
>> >from a list
>>
>>> of possibilities. For example, I'd like to able to write
>>> something like
>>>
>>>
>>> <choice property="foo">
>>> <condition> <available file="@{}/foo.txt" /> </condition>
>>>
>>> <option value="${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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