CODEWITHSUNDEEP
sbt
Nick
Nick

Reputation: 1875

How to define a custom task in project/Build.scala in sbt?

With the following task declaration in project/Build.scala, the print task is not recognised when I type in print at an SBT console.

lazy val print = task { println("print") }

What's wrong?

Upvotes: 8

Views: 7212

Answers (2)

Paul Draper
Paul Draper

Reputation: 83421

taskKey[Unit]("print") := println("print")

Then in your SBT console,

> print
print

In more complex code, you'll usually see keys separate from the settings.

val printTask = taskKey[Unit]("print")

printTask := println("print")

Upvotes: 3

Christian
Christian

Reputation: 4593

You need a TaskKey for this to work that can be instantiated by using the taskKey macro: 

lazy val printTask = taskKey[Unit]("print")

I recommend having a look at the corresponding documentation about tasks. The documentation says:

The name of the val is used when referring to the task in Scala code. The string passed to the TaskKey method is used at runtime, such as at the command line

Upvotes: 7

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