斯科普特/斯科普特

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")

  opt[File]('o', "out") required() valueName("<file>") action { (x, c) =>
    c.copy(out = x) } text("out is a required file property")

  opt[(String, Int)]("max") action { case ((k, v), c) =>
    c.copy(libName = k, maxCount = v) } validate { x =>
    if (x._2 > 0) success
    else failure("Value <max> must be >0") 
  } keyValueName("<libname>", "<max>") text("maximum count for <libname>")

  opt[Unit]("verbose") action { (_, c) =>
    c.copy(verbose = true) } text("verbose is a flag")

  note("some notes.\n")

  help("help") text("prints this usage text")

  arg[File]("<file>...") unbounded() optional() action { (x, c) =>
    c.copy(files = c.files :+ x) } text("optional unbounded args")

  cmd("update") action { (_, c) =>
    c.copy(mode = "update") } text("update is a command.") children(
    opt[Unit]("not-keepalive") abbr("nk") action { (_, c) =>
      c.copy(keepalive = false) } text("disable keepalive"),
    opt[Boolean]("xyz") action { (x, c) =>
      c.copy(xyz = x) } text("xyz is a boolean property")
  )
}
// parser.parse returns Option[C]
parser.parse(args, Config()) map { config =>
  // do stuff
} getOrElse {
  // arguments are bad, usage message will have been displayed
}

上面生成了以下用法文本:

scopt 3.x
Usage: scopt [update] [options] [<file>...]

  -f <value> | --foo <value>
        foo is an integer property
  -o <file> | --out <file>
        out is a required file property
  --max:<libname>=<max>
        maximum count for <libname>
  --verbose
        verbose is a flag
some notes.

  --help
        prints this usage text
  <file>...
        optional unbounded args

Command: update
update is a command.

  -nk | --not-keepalive
        disable keepalive    
  --xyz <value>
        xyz is a boolean property

这是我目前使用的。使用干净，没有太多包袱。 (免责声明:我现在维护这个项目)

我从来都不喜欢ruby那样的选项解析器。大多数使用它们的开发人员从来没有为他们的脚本编写合适的手册页，并且由于解析器的原因，最终会以没有以适当的方式组织的数页长的选项结束。

我一直喜欢用Perl的Getopt::Long来做事情。

我正在研究它的scala实现。早期的API看起来是这样的:

def print_version() = () => println("version is 0.2")

def main(args: Array[String]) {
  val (options, remaining) = OptionParser.getOptions(args,
    Map(
      "-f|--flag"       -> 'flag,
      "-s|--string=s"   -> 'string,
      "-i|--int=i"      -> 'int,
      "-f|--float=f"    -> 'double,
      "-p|-procedure=p" -> { () => println("higher order function" }
      "-h=p"            -> { () => print_synopsis() }
      "--help|--man=p"  -> { () => launch_manpage() },
      "--version=p"     -> print_version,
    ))

像这样调用脚本:

$ script hello -f --string=mystring -i 7 --float 3.14 --p --version world -- --nothing

将打印:

higher order function
version is 0.2

并返回:

remaining = Array("hello", "world", "--nothing")

options = Map('flag   -> true,
              'string -> "mystring",
              'int    -> 7,
              'double -> 3.14)

该项目托管在github scala-getoptions中。

我只是创建了简单的枚举

val args: Array[String] = "-silent -samples 100 -silent".split(" +").toArray
                                              //> args  : Array[String] = Array(-silent, -samples, 100, -silent)
object Opts extends Enumeration {

    class OptVal extends Val {
        override def toString = "-" + super.toString
    }

    val nopar, silent = new OptVal() { // boolean options
        def apply(): Boolean = args.contains(toString)
    }

    val samples, maxgen = new OptVal() { // integer options
        def apply(default: Int) = { val i = args.indexOf(toString) ;  if (i == -1) default else args(i+1).toInt}
        def apply(): Int = apply(-1)
    }
}

Opts.nopar()                              //> res0: Boolean = false
Opts.silent()                             //> res1: Boolean = true
Opts.samples()                            //> res2: Int = 100
Opts.maxgen()                             //> res3: Int = -1

我知道这个解决方案有两个主要的缺陷可能会让你分心:它消除了自由(即对其他库的依赖，你非常重视)和冗余(DRY原则，你只输入一次选项名称，作为Scala程序变量，并在第二次输入命令行文本时消除它)。

命令行接口Scala Toolkit (CLIST)

这也是我的!(虽然有点晚了)

https://github.com/backuity/clist

与scopt相反，它是完全可变的…但是等等!这给了我们一个很好的语法:

class Cat extends Command(description = "concatenate files and print on the standard output") {

  // type-safety: members are typed! so showAll is a Boolean
  var showAll        = opt[Boolean](abbrev = "A", description = "equivalent to -vET")
  var numberNonblank = opt[Boolean](abbrev = "b", description = "number nonempty output lines, overrides -n")

  // files is a Seq[File]
  var files          = args[Seq[File]](description = "files to concat")
}

还有一个简单的运行方法:

Cli.parse(args).withCommand(new Cat) { case cat =>
    println(cat.files)
}

当然，您可以做更多的事情(多命令，许多配置选项，……)，并且没有依赖性。

我将以一种独特的特性来结束，默认用法(对于多个命令经常被忽略):

我知道这个问题是很久以前问过的，但我认为它可能会帮助一些人，谁是谷歌周围(像我)，并点击这个页面。

扇贝看起来也很有希望。

特点(引用自链接的github页面):

标志，单值和多值选项 posix风格的短选项名称(-a)带有分组(-abc) gnu风格的长选项名称(——opt) 属性参数(-Dkey=value， -D key1=value key2=value) 非字符串类型的选项和属性值(带有可扩展转换器) 对尾随参数的强大匹配 子命令

还有一些示例代码(也来自Github页面):

import org.rogach.scallop._;

object Conf extends ScallopConf(List("-c","3","-E","fruit=apple","7.2")) {
  // all options that are applicable to builder (like description, default, etc) 
  // are applicable here as well
  val count:ScallopOption[Int] = opt[Int]("count", descr = "count the trees", required = true)
                .map(1+) // also here work all standard Option methods -
                         // evaluation is deferred to after option construction
  val properties = props[String]('E')
  // types (:ScallopOption[Double]) can be omitted, here just for clarity
  val size:ScallopOption[Double] = trailArg[Double](required = false)
}


// that's it. Completely type-safe and convenient.
Conf.count() should equal (4)
Conf.properties("fruit") should equal (Some("apple"))
Conf.size.get should equal (Some(7.2))
// passing into other functions
def someInternalFunc(conf:Conf.type) {
  conf.count() should equal (4)
}
someInternalFunc(Conf)

我喜欢joslinm的slide()方法，而不是可变的vars;)这里有一个不可改变的方法:

case class AppArgs(
              seed1: String,
              seed2: String,
              ip: String,
              port: Int
              )
object AppArgs {
  def empty = new AppArgs("", "", "", 0)
}

val args = Array[String](
  "--seed1", "akka.tcp://seed1",
  "--seed2", "akka.tcp://seed2",
  "--nodeip", "192.167.1.1",
  "--nodeport", "2551"
)

val argsInstance = args.sliding(2, 1).toList.foldLeft(AppArgs.empty) { case (accumArgs, currArgs) => currArgs match {
    case Array("--seed1", seed1) => accumArgs.copy(seed1 = seed1)
    case Array("--seed2", seed2) => accumArgs.copy(seed2 = seed2)
    case Array("--nodeip", ip) => accumArgs.copy(ip = ip)
    case Array("--nodeport", port) => accumArgs.copy(port = port.toInt)
    case unknownArg => accumArgs // Do whatever you want for this case
  }
}