SBT: dynamically detect building platform - scala

Question

I am trying dynamically change reference to the jars dependency I am using in my project, depending on the platform (Windows or Linux)
So, its a very trivial scenario,
How can I implement this simple check in the build.sbt ?

Answer 1

Potential approach is to pattern match on System.getProperty("os.name") within a custom defined setting like so
val configureDependencyByPlatform = settingKey[ModuleID]("Dynamically change reference to the jars dependency depending on the platform")
configureDependencyByPlatform := {
System.getProperty("os.name").toLowerCase match {
case mac if mac.contains("mac") => "org.example" %% "somelib-mac" % "1.0.0"
case win if win.contains("win") => "org.example" %% "somelib-win" % "1.0.0"
case linux if linux.contains("linux") => "org.example" %% "somelib-linux" % "1.0.0"
case osName => throw new RuntimeException(s"Unknown operating system $osName")
}
}
and then add the evaluated setting to libraryDependencies as follows
libraryDependencies ++= Seq(
configureDependencyByPlatform.value,
"org.scalatest" %% "scalatest" % "3.0.5",
...
)