How to run runMain from a custom task?

Question

I am using sbt v0.13.5

In my project, I would like to have an sbt task that can take some input (one line), do some work on it and discard some output (again, one line). I created a helper class in my project that does this so that I can call from the terminal via sbt runMain ( sbt "runMain com.example.utils.ClassName someArgument" ).

What I would like is to save myself while typing and complete the sbt task. I would just type in sbt doThing withStuff and have a taskKey named doThing that calls runMain with the name of the class to be started and any argument.

I know how to create tasks, but I cannot figure out how to call runMain from the user task definition in my build.sbt file. Can someone point me in the right direction?

Answer 1

 TaskKey[Unit]("myTask") := (runMain in Compile).toTask(" com.example.Main arg1 arg2").value 

runMain is an InputTask . InputTask has a toTask method with 0.13.1.

• https://github.com/sbt/sbt/commit/9dcb8727d819fb
• https://github.com/sbt/sbt/blob/v0.13.6/main/settings/src/main/scala/sbt/InputTask.scala#L33
• http://www.scala-sbt.org/0.13/docs/Input-Tasks.html#Get+a+Task+from+an+InputTask