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/* NSC -- new Scala compiler
* Copyright 2005-2013 LAMP/EPFL
* @author Paul Phillips
*/
package scala.tools
package cmd
import scala.collection.mutable.ListBuffer
import nsc.Properties.envOrNone
/** Mixes in the specification trait and uses the vals therein to
* side-effect private accumulators. From this emerges formatted help,
* lists of unary and binary arguments, an apply which can creates
* instances of the specification, and etc.
*
* @see Instance
*/
trait Reference extends Spec {
lazy val options = new Reference.Accumulators()
import options._
def helpMsg = options.helpMsg
def propertyArgs: List[String] = Nil
def isUnaryOption(s: String) = unary contains toOpt(s)
def isBinaryOption(s: String) = binary contains toOpt(s)
def isExpandOption(s: String) = expansionMap contains toOpt(s)
def expandArg(arg: String) = expansionMap.getOrElse(fromOpt(arg), List(arg))
protected def help(str: => String) = addHelp(() => str)
type ThisCommandLine <: CommandLine
class SpecCommandLine(args: List[String]) extends CommandLine(Reference.this, args) { }
protected def creator(args: List[String]): ThisCommandLine
final def apply(args: String*): ThisCommandLine = creator(propertyArgs ++ args flatMap expandArg)
type OptionMagic = Opt.Reference
protected implicit def optionMagicAdditions(name: String) = new Opt.Reference(programInfo, options, name)
}
object Reference {
val MaxLine = 80
class Accumulators() {
private val _help = new ListBuffer[() => String]
private var _unary = List[String]()
private var _binary = List[String]()
private var _expand = Map[String, List[String]]()
def helpFormatStr = " %-" + longestArg + "s %s"
def defaultFormatStr = (" " * (longestArg + 7)) + "%s"
def addUnary(s: String) = _unary +:= s
def addBinary(s: String) = _binary +:= s
def addExpand(opt: String, expanded: List[String]) =
_expand += (opt -> expanded)
def mapHelp(g: String => String) = {
val idx = _help.length - 1
val f = _help(idx)
_help(idx) = () => g(f())
}
def addHelp(f: () => String) = _help += f
def addHelpAlias(f: () => String) = mapHelp { s =>
val str = "alias for '%s'" format f()
def noHelp = (helpFormatStr.format("", "")).length == s.length
val str2 = if (noHelp) str else " (" + str + ")"
s + str2
}
def addHelpDefault(f: () => String) = mapHelp { s =>
val str = "(default: %s)" format f()
if (s.length + str.length < MaxLine) s + " " + str
else defaultFormatStr.format(s, str)
}
def addHelpEnvDefault(name: String) = mapHelp { s =>
val line1 = "%s (default: %s)".format(s, name)
val envNow = envOrNone(name) map ("'" + _ + "'") getOrElse "unset"
val line2 = defaultFormatStr.format("Currently " + envNow)
line1 + "\n" + line2
}
lazy val unary = (_unary ++ _expand.keys).distinct
lazy val binary = _binary.distinct
lazy val all = unary ++ binary
lazy val expansionMap = _expand
lazy val helpMsg = _help map (f => f() + "\n") mkString
lazy val longestArg = all map (_.length) max
}
}
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