SBT how to create custom command

Question

Given I have

build.sbt

name := """app"""



version := "1.0-SNAPSHOT"



lazy val root = (project in file(".")).enablePlugins(PlayScala)



scalaVersion := "2.11.7"



// <-- some other code -->



import Fixtures._



lazy val fixtures = inputKey[Unit]("Generating Cassandra fixtures")



fixtures := {

  Fixtures.generate()

}

and Fixtures.scala in

project

directory

object Fixtures {

  def generate (): Unit = {

    println("generating fixtures")

  }

}

I am able to run command

./activator fixtures

and I am getting "generating fixtures"

But how can I call some service, let say

GenerateUserFixtureService.scala

but from

app/scala/com/MyProject/Service

directory. Import package does not work, because

project

directory belongs to different package. I am not able to import anything to

Fixtures.scala

from Play

|

|___app

|   |__scala

|      |__com

|         |__MyProject

|            |__Service

|               |--GenerateUserFixtureService.scala

|___project

|   |--Fixtures.scala

|___

    |--build.sbt

Actually the question is, why I am able to import to

build.sbt

only files from

project

directory. Or how can I call another files from

app

dir?

Or maybe the way I am thinking is completely wrong. I just want to create some command

upload:fixtures

send:emails

etc, and call some scala class. How can I achieve this?

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Answer 1

For creating a custom command you must specify a function which corresponds to the logic of your command. Let's consider a few examples: first just print hello message:

 def helloSbt = Command.command("hello") { state =>
        println("Hello, SBT")
        state
    }

commands += helloSbt

just put this code into build.sbt, commands is project key which is present into sbt.Keys as val commands = SettingKey[Seq[Command]]

Of course, you can manage the statement of your command like success or fail:

def failJustForFun = Command.single("fail-condidtion") {
        case (state, "true") => state.fail
        case (state, _) => state
    }

You can change the color in console for specific part of your command or output of this command via leveraging of DefaultParsers:

    lazy val color = token( Space ~> ("blue" ^^^ "4" | "green" ^^^ "2") )
    lazy val select = token( "fg" ^^^ "3" | "bg" ^^^ "4" )
    lazy val setColor = (select ~ color) map { case (g, c) => "\033[" + g + c + "m" }

And like alternative, you can extend xsbti.AppMain and implement - your own logic

SBT how to create custom command

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