Gradle Home determination

[Russel Winder-4]

Whilst waiting for a synchronization, I thought I would take a quick
look at the Gradle Ant task to try and get some movement on that.  Apart
from not having any tests yet :-( the problem of the moment is how to
know where Gradle Home is in order to initiate a GradleLauncher
instance.

The StartParameter constructor says it gives all the fields default
values.  Unfortunately it appears not to give a reasonable default value
for the Gradle Home, this has to be set manually.  So the question is
what is the best way of discovering the Gradle Home to use -- given that
in an Ant context there isn't actually a Gradle Home, just the Gradle
jar in the path so as to create the gradle Ant task.

Thanks.

--
Russel.
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