ant - using conditions with in a target

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coltrane - 30 Mar 2006 20:57 GMT

Is it possible to use a condition within a target?

I have a target that contains some steps that only need to be run if a
certain condition exists.
I know how to set a condition property but how can I use an "if" to
control the flow of the steps.

something like this ( I know the if is invalid )

<target name="sometarget">
<delete dir="directoryOne"/>
<if condition>
<delete dir="directoryTwo"/>
</if>
</target>

thanks for your help

john

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SMC - 31 Mar 2006 02:29 GMT

> Is it possible to use a condition within a target?
>
[quoted text clipped - 11 lines]
> </if>
> </target>

If the deletion order is not important:

<target name="sometarget" depends="othertarget">
<delete dir="directoryOne"/>
</target>


<target name="othertarget" if="deleteDirTwo">
<delete dir="directoryTwo"/>
</target>

Otherwise:

<target name="sometarget">
<delete dir="directoryOne"/>
<antcall target="othertarget"/>
</target>


<target name="othertarget" if="deleteDirTwo">
<delete dir="directoryTwo"/>
</target>

Signature

Sean

If you want it real bad, you can get it *real bad*.

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Wibble - 31 Mar 2006 03:05 GMT

>>Is it possible to use a condition within a target?
>>
[quoted text clipped - 34 lines]
> <delete dir="directoryTwo"/>
> </target>

And if you get up with that, use the ant-contrib jar.

It has an an If task exactly like you wanted, and other good stuff.
Ant is just a theoretical exercise without it.

http://ant-contrib.sourceforge.net/ant-contrib/manual/tasks/if.html

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coltrane - 31 Mar 2006 13:44 GMT

Thanks,

I might give this a try.

john

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coltrane - 31 Mar 2006 14:19 GMT

wow, I what a great package!

thanks again

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coltrane - 31 Mar 2006 13:44 GMT

Thanks for the idea.

I also think I might perform use an antcall to call a target with an if
condition.

Thanks again for the help

john

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Roedy Green - 31 Mar 2006 19:56 GMT

>I also think I might perform use an antcall to call a target with an if
>condition.

here is an ant conditional copy. This is why I spit on XML as too
impoverished for programming and too bloated.


<available property="has.screenshot"
file="${screenshot.dir}/${ant.project.name}.png" />
<antcall target="copy.screenshot" />


<target name="copy.screenshot" if="has.screenshot">
<copy file="${screenshot.dir}/${ant.project.name}.png"
tofile="${package.dir}/${ant.project.name}screenshot.png"
failonerror="false" overwrite="true" />
</target>

What this says is :

if exists E:\mindprod\screenshot\currcon.png
copy E:\mindprod\screenshot\currcon.png
C:\com\mindprod\currcon\currconscreenshot.png

Signature

Canadian Mind Products, Roedy Green.
http://mindprod.com Java custom programming, consulting and coaching.

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Wibble0@gmail.com - 31 Mar 2006 20:56 GMT

> >I also think I might perform use an antcall to call a target with an if
> >condition.
[quoted text clipped - 23 lines]
> Canadian Mind Products, Roedy Green.
> http://mindprod.com Java custom programming, consulting and coaching.

Why doesn't just the copy suffice?

<copy file="${screenshot.dir}/${ant.project.name}.png"
tofile="${package.dir}/${ant.project.name}screenshot.png"
failonerror="false" overwrite="true" />

XML is ugly but not unusable. Ant without If, for, runtarget and other
ant-contrib
tasks is unusable, but thats not because of XML.

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Roedy Green - 31 Mar 2006 21:16 GMT

>Why doesn't just the copy suffice?

because it generates bogus error messages if the file does not exist.

Signature

Canadian Mind Products, Roedy Green.
http://mindprod.com Java custom programming, consulting and coaching.

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ant - using conditions with in a target

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