#!/usr/bin/env python

import sys, string, re, optparse
import config, filetool, comment




def convertMac2Unix(content):
  return content.replace("\r", "\n")

def convertMac2Dos(content):
  return content.replace("\r", "\r\n")

def convertDos2Unix(content):
  return content.replace("\r\n", "\n")

def convertDos2Mac(content):
  return content.replace("\r\n", "\r")

def convertUnix2Dos(content):
  return content.replace("\n", "\r\n")

def convertUnix2Mac(content):
  return content.replace("\n", "\r")




def any2Unix(content):
  # DOS must be first, because it is a combination of Unix & Mac
  return convertMac2Unix(convertDos2Unix(content))

def any2Dos(content):
  # to protect old DOS breaks first, we need to convert to
  # a line ending with single character first e.g. Unix
  return convertUnix2Dos(any2Unix(content))

def any2Mac(content):
  # to protect old DOS breaks first, we need to convert to
  # a line ending with single character first e.g. Unix
  return convertUnix2Mac(any2Unix(content))



def getLineEndingName(content):
  if "\r\n" in content:
    return "dos"

  if "\r" in content:
    return "mac"

  # defaults to unix
  return "unix"

def getLineEndingSequence(content):
  if "\r\n" in content:
    return "\r\n"

  if "\r" in content:
    return "\r"

  # defaults to unix
  return "\n"



def tab2Space(content, spaces=2):
  return content.replace("\t", " " * spaces)

def spaces2Tab(content, spaces=2):
  return content.replace(" " * spaces, "\t")



def removeTrailingSpaces(content):
  ending = getLineEndingSequence(content)
  lines = content.split(ending)
  length = len(lines)
  pos = 0

  while pos < length:
    lines[pos] = lines[pos].rstrip()
    pos += 1

  return ending.join(lines)














def main():
  allowed = [ "any2Dos", "any2Mac", "any2Unix", "convertDos2Mac", "convertDos2Unix", "convertMac2Dos", "convertMac2Unix", "convertUnix2Dos", "convertUnix2Mac", "spaces2Tab", "tab2Space" ]
  
  parser = optparse.OptionParser()

  parser.add_option("-q", "--quiet", action="store_false", dest="verbose", default=False, help="Quiet output mode.")
  parser.add_option("-v", "--verbose", action="store_true", dest="verbose", help="Verbose output mode.")
  parser.add_option("-c", "--command", dest="command", default="normalize", help="Normalize a file")
  parser.add_option("--encoding", dest="encoding", default="utf-8", metavar="ENCODING", help="Defines the encoding expected for input files.")

  (options, args) = parser.parse_args()
  
  if not options.command in allowed:
    print "Unallowed command: %s" % options.command
    sys.exit(1)

  if len(args) == 0:
    print "Needs one or more arguments (files) to modify!"
    sys.exit(1)
    
  for fileName in args:
    if options.verbose:
      print "  * Running %s on: %s" % (options.command, fileName)
    
    origFileContent = filetool.read(fileName, options.encoding)
    patchedFileContent = eval(options.command + "(origFileContent)")
    
    if patchedFileContent != origFileContent:
      filetool.save(fileName, patchedFileContent, options.encoding)





if __name__ == '__main__':
  try:
    main()

  except KeyboardInterrupt:
    print
    print "  * Keyboard Interrupt"
    sys.exit(1)