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From "Mark Modrall" <>
Subject capturing exec output and massaging it
Date Fri, 18 Aug 2006 19:48:53 GMT


I'm using exec to perform an svn update for the build.  I'm capturing
the output from that and looking for the revision number in it, like


    <target name="updatesvn" depends="init">

        <exec executable="svn" outputproperty="upout"

            <arg line="update -r ${svnrev}"/>



pattern=".*revision:*\s(\d{1,10})\.*$" replace="\1"/>






My questions:

1)       Is there any way to get the equivalent of the
<redirector>/regex into another property?  In the cases where svn fails
and you don't get a revision number, I'd like to see what the original
output was.  I.e. start with ${upout} and have the result of the regex
be put in ${uprev}?  I checked ${upstat} and svn is nice enough to have
a success status even when it fails to execute...  Ugh...  I'd like to
avoid writing the output to a temp file and using a file-based filter
chain, but I didn't see any way to define that kind of a chain from
property to property.

2)       I tried to set a default value for ${upout} to indicate a
failure, but when other tasks try to look at it after this, it only has
the default initializer and not the result of this target.  Is the
result of <exec ouputproperty="upout"> target-local if the property has
been defined previously?

3)       How does one do conditionals generally?  I know <fail> lets you
do conditionals, but where else can you use them?




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