I have used NAnt 0.84 for months. Now I am experimenting with 0.85 using the
nant-0.85-20040705.zip nightly build.
I need to determine whether an environment variable is set or not. If I do
<echo message=""|${environment::get-variable('XYZ')}|"/>
where environment variable XYZ does NOT exist, then it prints ||, which implies that
the value of the function is the empty string. However, if I do
<if test="${environment::get-variable('XYZ') = '' }">
<echo message="env not defined"/>
</if>
which would appear to compare the function result against an empty string, NAnt bombs
out with a null reference exception along with a plea to send a bug report to
nant-developers.
OK, so maybe the value of the function is null rather than the empty string, but if
so, how do you compare (safely) against null?
I eventually found that
<if
test="${convert::to-string(environment::get-variable('FEATURETESTS-configname'))=''}">
would work. convert::to-string() apparently accepts null inputs and output an empty
string. But this seems rather verbose for simply checking to see if the environment
variable is not set.
Merrill
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