How to duplicate a task, e.g. compile? - sbt

Question

For various reasons, I have a task enhance triggered by compile because we need it to run our code and I don't want programmers to just compile and forget to enhance.
This works fine but in some cases, especially to debug the enhancer, I need a compileOnly task doing exactly the same thing as compile but without the attached trigger.
Is there a way to "clone" compile? I tried:
object EnhancerBuild extends Build {
lazy val compileOnly = taskKey[Analysis]("compileOnly") in Compile
lazy val root = Project("root", file(".")) settings(
compileOnly <<= compileTask
)
}
But it does not find the compilerReporter & compileInputs settings.

Answer 1

Unless I'm mistaken, you really need another task that would mimic one of the many from sbt, e.g. compile. If so, see the following from build.sbt:
lazy val compileOnly = taskKey[sbt.inc.Analysis]("compileOnly")
compileOnly <<= (compile in Compile)
With the definition, compileOnly depends on compile in Compile scope.
> inspect compileOnly
[info] Task: sbt.inc.Analysis
[info] Description:
[info] compileOnly
[info] Provided by:
[info] {file:/C:/dev/sandbox/compile-copy/}compile-copy/*:compileOnly
[info] Defined at:
[info] C:\dev\sandbox\compile-copy\build.sbt:3
[info] Dependencies:
[info] compile:compile
[info] Delegates:
[info] *:compileOnly
[info] {.}/*:compileOnly
[info] */*:compileOnly