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package com.rockymadden.stringmetric.cli
import scala.annotation.tailrec
object OptionMap {
def apply(args: Array[String]): OptionMap = apply(args: _*)
def apply(varargs: String*): OptionMap = {
@tailrec
def next(om: OptionMap, a: List[String]): OptionMap = {
val double = """^(--[a-zA-Z0-9]+)(\=[a-zA-Z0-9\.\-\_]+)?""".r
val single = """^(-[a-zA-Z0-9]+)(\=[a-zA-Z0-9\.\-\_]+)?""".r
val less = """([a-zA-Z0-9\/\-\_\$\.]+)""".r
a match {
// Empty, return.
case Nil => om
// Double dash options, without value.
case double(k, null) :: t => next(om + (Symbol(k.tail.tail) -> ""), t)
// Double dash options, with value.
case double(k, v) :: t => next(om + (Symbol(k.tail.tail) -> v.tail), t)
// Single dash options, without value.
case single(k, null) :: t => next(om + (Symbol(k.tail) -> ""), t)
// Single dash options, with value. Value is discarded.
case single(k, v) :: t => next(om + (Symbol(k.tail) -> ""), t)
// Dashless options.
case less(v) :: t if v.head != '-' =>
if (om.contains('dashless)) {
val dashless = om('dashless) + " " + v.trim
next((om - 'dashless) + ('dashless -> dashless), t)
} else next(om + ('dashless -> v.trim), t)
// Invalid option, ignore.
case _ :: t => next(om, t)
}
}
next(Map.empty[Symbol, String], varargs.toList)
}
}
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