Developing plugin via external project reference

[benmccann]

Hi,

I'm trying to figure out how to create an sbt plugin.  The plugins wiki page suggested using an external project reference.  I have my plugin in a class named com.benmccann.sbtplovr.SbtPlovrPlugin.  If I make any reference to that class in the main project's build file then the project does not load saying that it can't find com.benmccann.  If I remove the reference then I see it print out a line "Loading project definition from /home/bmccann/src/sbt-plovr/project".  Is it impossible to reference classes from an external project in the main project's build file?  Or am I just doing something wrong here?

Thanks,

Ben

[Mark Harrah]

Hi Ben,

On Fri, 17 Aug 2012 00:06:16 -0700 (PDT)
benmccann <benjamin...@gmail.com> wrote:

> Hi,
>

> I'm trying to figure out how to create an sbt plugin. The plugins wiki page<https://github.com/harrah/xsbt/wiki/Plugins>suggested using an external project reference. I have my plugin in a class

> named com.benmccann.sbtplovr.SbtPlovrPlugin. If I make any reference to
> that class in the main project's build file then the project does not load
> saying that it can't find com.benmccann. If I remove the reference then I
> see it print out a line "Loading project definition from
> /home/bmccann/src/sbt-plovr/project". Is it impossible to reference
> classes from an external project in the main project's build file? Or am I
> just doing something wrong here?

It is likely you have declared the external dependency in project/Build.scala. This will only make the classes available to your project sources (in src/main/scala for example).

Plugin external dependencies need to go in project/project/Build.scala, the build definition for your build definition. It is known that this is not ideal, but at least it is possible.

-Mark

> Thanks,
> Ben
>
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[Ben McCann]

Ah, thanks for the clarification!  This is exactly what I did and I knew it was wrong, but overlooked the extra "project" in the docs.  I was able to make a lot of progress just going the publish-local route in the meantime.

Thanks!

-Ben

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