HOWTO Use Ant to discover the Ceylon home folder

[Tako Schotanus]

Hi,

just a heads up that we now a have new way for ant tasks to find out where CEYLON_HOME is located: by using the `ceylon` command itself.

The following code shows how to do this:

    <exec executable="ceylon" outputproperty="ceylon.home" failifexecutionfails="false">

        <arg value="--show-home" />

    </exec>

    <property environment="env"/>

    <property name="env.CEYLON_HOME" value="${ceylon.home}"/>

This will use the new `--show-home` option for the `ceylon` command (which might be useful in shell scripts as well) to retrieve the currently active distribution's home folder.

Or if $CEYLON_HOME is set in the environment its value will be used instead

In the rest of the build file you'll be able to use ${env.CEYLON_HOME} to refer to Ceylon's  home directory.

HTH,
-Tako

PS: there are probably better more fool-proof way to do this, but this code is short and concise and works in most cases.

[Stephane Epardaud]

Sounds good! Document it somewhere ;)

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Stéphane Épardaud