This is largely a shameless clone of my answer to the Java question of the same topic. It turns out that JewelCLI is Scala-friendly in that it doesn't require JavaBean style methods to get automatic argument naming.
JewelCLI is a Scala-friendly Java library for command-line parsing that yields clean code. It uses Proxied Interfaces Configured with Annotations to dynamically build a type-safe API for your command-line parameters.
An example parameter interface Person.scala:
import uk.co.flamingpenguin.jewel.cli.Option
trait Person {
@Option def name: String
@Option def times: Int
}
An example usage of the parameter interface Hello.scala:
import uk.co.flamingpenguin.jewel.cli.CliFactory.parseArguments
import uk.co.flamingpenguin.jewel.cli.ArgumentValidationException
object Hello {
def main(args: Array[String]) {
try {
val person = parseArguments(classOf[Person], args:_*)
for (i <- 1 to (person times))
println("Hello " + (person name))
} catch {
case e: ArgumentValidationException => println(e getMessage)
}
}
}
Save copies of the files above to a single directory and download the JewelCLI 0.6 JAR to that directory as well.
Compile and run the example in Bash on Linux/Mac OS X/etc.:
scalac -cp jewelcli-0.6.jar:. Person.scala Hello.scala
scala -cp jewelcli-0.6.jar:. Hello --name="John Doe" --times=3
Compile and run the example in the Windows Command Prompt:
scalac -cp jewelcli-0.6.jar;. Person.scala Hello.scala
scala -cp jewelcli-0.6.jar;. Hello --name="John Doe" --times=3
Running the example should yield the following output:
Hello John Doe
Hello John Doe
Hello John Doe