Extent SourceTask for check and format tasks.

[Tapchicoma]

Closes #85

[JLLeitschuh]

Unfortunately, this is going to be an API breaking change, unless @bamboo,@wolfs, or @eskatos has any brilliant ideas as to how not to have this be an API breaking change.

[Tapchicoma]

If you are talking about this:

    @InputFiles
    @SkipWhenEmpty
    @PathSensitive(PathSensitivity.RELATIVE)
    override fun getSource(): FileTree { return super.getSource() }

I have to add it otherwise task becomes non-relocatable (not support caching).

Original getSource() method doesn't have any @PathSensitive annotation.

[JLLeitschuh]

@Tapchicoma Yea, I know. That's why I was asking for feedback.

Related: gradle/kotlin-dsl-samples#1026

Also, as pointed out by @eskatos, sources was internal before. So technically this wouldn't be an API breaking change.

[JLLeitschuh]

You're sure this works? We only lint the sources we're supposed to?

[Tapchicoma]

yes, this actually returns paths to kotlin files, not directories passed to task.

[Tapchicoma]

Check added init {} block that adds include filters to this source task. I assume internally it filters out all passed sources.

[JLLeitschuh]

Looks good to me!