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## all new scopt 3.0
scopt 3.0 was rewritten from scratch to clean up the API:
val parser = new scopt.OptionParser[Config]("scopt") {
head("scopt", "3.x")
opt[Int]('f', "foo") action { (x, c) =>
c.copy(foo = x) } text("foo is an integer property")
arg[File]("<file>...") unbounded() optional() action { (x, c) =>
c.copy(files = c.files :+ x) } text("optional unbounded args")
}
### polymorphic opt/arg
Both `opt[A]` and `arg[A]` take a type parameter of `A: Read`. Out of the box, `Unit`, `Int`, `Long`, `Double`, `String`, `Boolean`, `BigInt`, `BigDecimal`, `java.io.File`, `java.net.URI`, `java.util.Calendar` are supported. Key=value parameters are expressed as pair `(A1, A2)`.
### occurrences and custom validation
Occurrences can be specified using the fluent interface:
opt[File]('o', "out") required()
arg[File]("<file>...") optional() unbounded()
Custom validation logic:
opt[Int]('f', "foo") validate { x =>
if (x > 0) success else failure("Option --foo must be >0") }
### commands
scopt3 supports multiple levels of command structure:
cmd("backend") text("commands to manipulate backends:\n") action { (x, c) =>
c.copy(flag = true) } children {
cmd("update") children {
arg[String]("<a>") action { (x, c) => c.copy(a = x) }
}
}
See [scopt](https://github.com/scopt/scopt) for more details.
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