I have a pattern that is repeated several times, so I'm trying to
extract it into separate tasks in a common build file. I think I'm
running into problems because I'm trying to treat ant more like a
functional language than it is.
In several places, I have targets that look like this
<target name="generate-foo" depends="check-foo-up-to-date"
unless="foo-up-to-date">
<do-generation param="foo">
<stuff value="foo" />
</do-generation>
</target>
<target name="check-foo-up-to-date">
<dependset>
<!-- several srcfileset and targetfileset -->
<targetfilelist dir="." files="foo-test-file" />
</dependset>
<available file="foo-test-file" property="foo-up-to-date"/>
</target>
When ant tries to run generate-foo, it first runs check-foo-up-to-date,
which sets foo-up-to-date if foo is up to date. If foo is up to date,
the unless parameter means the generate-foo target isn't run and all is
good.
If I try to factor out the common parts, there are a few things that
need to be parameterized, which prevents me from calling them with a
simple depends attribute. Instead, I'm using antcall and the new
targets look like
<target name="generate-foo" depends="check-foo-up-to-date"
unless="foo-up-to-date">
<antcall target="generate">
<param name="name" value="foo"/>
</antcall>
</target>
<target name="check-foo-up-to-date">
<antcall target="check-up-to-date">
<param name="file" value="foo-test-file"/>
<param name="property" value="foo-up-to-date"/>
</antcall>
</target>
with generate and check-up-to-date being the new, generic tasks. This
appears to work, except that foo-up-to-date doesn't get updated in the
original project, only the project associated with the antcall. Is
there a good way to get the property back to the original project? I
could do it with files and available, but I'd like something simple to
put into the multiple copies of check-*-up-to-date.
Troy
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