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## immutable parser
In addition to the mutable parser from scopt 1.x, 2.0.0 adds an immutable parser.
val parser = new scopt.immutable.OptionParser[Config]("scopt", "2.x") { def options = Seq(
intOpt("f", "foo", "foo is an integer property") { (v: Int, c: Config) => c.copy(foo = v) },
opt("o", "output", "output") { (v: String, c: Config) => c.copy(bar = v) },
booleanOpt("xyz", "xyz is a boolean property") { (v: Boolean, c: Config) => c.copy(xyz = v) },
keyValueOpt("l", "lib", "<libname>", "<filename>", "load library <libname>")
{ (key: String, value: String, c: Config) => c.copy(libname = key, libfile = value) },
keyIntValueOpt(None, "max", "<libname>", "<max>", "maximum count for <libname>")
{ (key: String, value: Int, c: Config) => c.copy(maxlibname = key, maxcount = value) },
arg("<file>", "some argument") { (v: String, c: Config) => c.copy(whatnot = v) }
) }
// parser.parse returns Option[C]
parser.parse(args, Config()) map { config =>
// do stuff
} getOrElse {
// arguments are bad, usage message will have been displayed
}
Instead of updating the config object in-place, the immutable parser expects call back functions that takes a config object and returns a new one.
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