Crash in relativize when source directory not in subfolder

[lrytz]

I have a project where (sourceDirectory in Test) is not a child of baseDirectory, it's only accessible through the parent. Calling sbt.IO.relativize will return None and therefore def relativize in Eclipse.scala crashes.

[hseeberger]

Thanks for reporting. Please give me access to a reproducible test case.

In the meantime you may want to consider the following quick fix: Try to avoid non standard project layouts, they are confusing for beginners anyway.

[lrytz]

I could only reproduce it with two projects:

https://gist.github.com/3236082

> eclipse
[info] About to create Eclipse project files for your project(s).
[error] java.util.NoSuchElementException: None.get
[error] Use 'last' for the full log.

[hseeberger]

Thanks.

I think what you are trying to do is not possible in Eclipse. Could you please confirm?

Of course sbteclipse should not fail with an error, but if your scenario was valid for Eclipse, then I would have to treat it differently.

[lrytz]

I don't know if it's possible in eclipse, I don't actually use eclipse currently.

As you say, sbteclipse should just not crash, and skip the project if it cannot be expressed as an eclipse classpath.

[Rotsor]

Another way to reproduce the problem is to have your target directory outside of the project base path.

The contents of project/Build.scala reproducing the problem:

import sbt._
import Keys._
object B extends Build {
lazy val dummy = Project(id = "dummy", base = file("Dummy"))
.settings(target := file("target/Dummy"))
}

My preferred solution would be to have sbteclipse produce an Eclipse-compatible directory layout with the help of symbolic links.

[jsuereth]

Here's what you need for relative directories in Eclipse:

in the .project file:

<projectDescription>
    ...
    <linkedResources>
            <link>
                    <name>NAME_OF_EXTERNAL_LINK</name>
                    <type>2</type>
                    <location>LOCATION_TO_EXTERNAL_DIR</location>
            </link>
    </linkedResources>
</projectDescription

In the .classpath file:

<classpathentry kind="src" path="NAME_OF_EXTERNAL_LINK"/>

It appears eclipse is emulating symlinks. If you look in the build path settings, the feature is the "link source" button.

I'm adding a +10 for adding this feature. I run into it all the time on my current project. IF you guide me in how to fix it (what files I should be touching) I'm more than willing to submit a patch.

• Josh

[jsuereth]

OH, also related, if the path has ".." in it, this plugin is not catching that it is non-relative. I think this may be due to SBT's relativize function, if so I can report against SBT.

[jsuereth]

BTW this is ffixed in 2.2.0-RC1 if you could give it a try.

[Rotsor]

Fails the same way on my example even after switching to sbteclipse-plugin 2.2.0-RC1.