Using "if" to test for existence of properties

Hello,

 

I could use some advice about how to handle this situation:

 

I have a property, MyProperty, that may or may not be set.  I want a task to execute if the property is set, e.g.

<echo messsage="Hello ${MyProperty}!" if="${property::exists('MyProperty')" />

 

If MyProperty is not set, this task fails because NAnt appears to evaluate the message portion regardless of the result of the IF evaluation.  I could rewrite like this:

 

<if test="${property::exists('MyProperty')}">

    <echo message="Hello ${MyProperty}!" />

</if>

 

However, I run into the same issue with filterchains:

 

<!-- FAILS if MyProperty is not set, because NAnt evaluates the tokens regardless of the IF result -->

<copy failonerror="true" verbose="true" todir="C:\Temp">

    <fileset refid="Deploy-FileSet" />

    <filterchain>

        <replacetokens begintoken="[" endtoken="]" ignorecase="true" if="${property::exists('MyProperty')}">

            <token key="ABC" value="${MyProperty}" />

        </replacetokens>

    </filterchain>

</copy>

 

I'd rather not enclose the whole definition of the copy in an IF, with a nearly identical "else" version for the case when MyProperty is not set.

 

How have you handled this situation?

 

Thanks,

Durand

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