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+#
+#
+#            Nimrod's Runtime Library
+#        (c) Copyright 2008 Andreas Rumpf
+#
+#    See the file "copying.txt", included in this
+#    distribution, for details about the copyright.
+#
+
+## This module provides the standard Nimrod command line parser.
+## It supports one convenience iterator over all command line options and some
+## lower-level features.
+
+{.push debugger: off.}
+
+import 
+  os, strutils
+
+type 
+  TCmdLineKind* = enum        ## the detected command line token
+    cmdEnd,                   ## end of command line reached
+    cmdArgument,              ## argument detected
+    cmdLongoption,            ## a long option ``--option`` detected
+    cmdShortOption            ## a short option ``-c`` detected
+  TOptParser* = 
+      object of TObject ## this object implements the command line parser  
+    cmd: string
+    pos: int
+    inShortState: bool
+    kind*: TCmdLineKind       ## the dected command line token
+    key*, val*: string        ## key and value pair; ``key`` is the option
+                              ## or the argument, ``value`` is not "" if
+                              ## the option was given a value
+
+proc init*(cmdline: string = ""): TOptParser
+  ## inits the option parser. If ``cmdline == ""``, the real command line
+  ## (as provided by the ``OS`` module) is taken.
+
+proc next*(p: var TOptParser)
+  ## parses the first or next option; ``p.kind`` describes what token has been
+  ## parsed. ``p.key`` and ``p.val`` are set accordingly.
+
+proc getRestOfCommandLine*(p: TOptParser): string
+  ## retrieves the rest of the command line that has not been parsed yet.
+
+# implementation
+
+proc init(cmdline: string = ""): TOptParser = 
+  result.pos = strStart
+  result.inShortState = false
+  if cmdline != "": 
+    result.cmd = cmdline
+  else: 
+    result.cmd = ""
+    for i in countup(1, ParamCount()): 
+      result.cmd = result.cmd & quoteIfSpaceExists(paramStr(i)) & ' '
+  result.kind = cmdEnd
+  result.key = ""
+  result.val = ""
+
+proc parseWord(s: string, i: int, w: var string, 
+               delim: TCharSet = {'\x09', ' ', '\0'}): int = 
+  result = i
+  if s[result] == '\"': 
+    inc(result)
+    while not (s[result] in {'\0', '\"'}): 
+      add(w, s[result])
+      inc(result)
+    if s[result] == '\"': inc(result)
+  else: 
+    while not (s[result] in delim): 
+      add(w, s[result])
+      inc(result)
+
+proc handleShortOption(p: var TOptParser) = 
+  var i: int
+  i = p.pos
+  p.kind = cmdShortOption
+  add(p.key, p.cmd[i])
+  inc(i)
+  p.inShortState = true
+  while p.cmd[i] in {'\x09', ' '}: 
+    inc(i)
+    p.inShortState = false
+  if p.cmd[i] in {':', '='}: 
+    inc(i)
+    p.inShortState = false
+    while p.cmd[i] in {'\x09', ' '}: inc(i)
+    i = parseWord(p.cmd, i, p.val)
+  if p.cmd[i] == '\0': p.inShortState = false
+  p.pos = i
+
+proc next(p: var TOptParser) = 
+  var i: int
+  i = p.pos
+  while p.cmd[i] in {'\x09', ' '}: inc(i)
+  p.pos = i
+  setlen(p.key, 0)
+  setlen(p.val, 0)
+  if p.inShortState: 
+    handleShortOption(p)
+    return 
+  case p.cmd[i]
+  of '\0': 
+    p.kind = cmdEnd
+  of '-': 
+    inc(i)
+    if p.cmd[i] == '-': 
+      p.kind = cmdLongOption
+      inc(i)
+      i = parseWord(p.cmd, i, p.key, {'\0', ' ', '\x09', ':', '='})
+      while p.cmd[i] in {'\x09', ' '}: inc(i)
+      if p.cmd[i] in {':', '='}: 
+        inc(i)
+        while p.cmd[i] in {'\x09', ' '}: inc(i)
+        p.pos = parseWord(p.cmd, i, p.val)
+      else: 
+        p.pos = i
+    else: 
+      p.pos = i
+      handleShortOption(p)
+  else: 
+    p.kind = cmdArgument
+    p.pos = parseWord(p.cmd, i, p.key)
+
+proc getRestOfCommandLine(p: TOptParser): string = 
+  result = strip(copy(p.cmd, p.pos + strStart, len(p.cmd) - 1)) 
+
+iterator getopt*(): tuple[kind: TCmdLineKind, key, val: string] =
+  ##this is an convenience iterator for iterating over the command line.
+  ##This uses the TOptParser object. Example:
+  ##
+  ## .. code-block:: nimrod
+  ##   var
+  ##     filename = ""
+  ##   for kind, key, val in getopt():
+  ##     case kind
+  ##     of cmdArgument: 
+  ##       filename = key
+  ##     of cmdLongOption, cmdShortOption:
+  ##       case key
+  ##       of "help", "h": writeHelp()
+  ##       of "version", "v": writeVersion()
+  ##     of cmdEnd: assert(false) # cannot happen
+  ##   if filename == "":
+  ##     # no filename has been given, so we show the help:
+  ##     writeHelp()
+  var p = init()
+  while true:
+    next(p)
+    if p.kind == cmdEnd: break
+    yield (p.kind, p.key, p.val)
+
+{.pop.}