#!/bin/env python

#==============================================================
# sequence - Sequencing utility that renames files.'
#--------------------------------------------------------------'
# usage: sequence <-p prefix> <-s suffix> files
#--------------------------------------------------------------'
# Author: John Strickland
# Date:   March 10, 2002
# Notes:  Written to manage pictures retrieved from digital camera.
#         suffix defaults to '.jpg'.  This can be easily changed
#         below.

import sys, os

def pad(i, n):
  j = 1; x = n; z = ''
  while (x / 10) > 0:
    x = x / 10
    j = j + 1
  if test: print 'n = ' + str(n), '\tj = ', j
  while i > j:
    z = z + '0'
    j = j + 1
  if test: print 'z = ', z, '\treturn:  ', z + str(n)
  return z + str(n)

def usage():
  print '========================================================'
  print ' sequence - Sequencing utility that renames files.'
  print '--------------------------------------------------------'
  print 'usage: ', sys.argv[0], '<-p prefix> <-s suffix> files'
  print '--------------------------------------------------------\n'



### Main ###

#init vars
pre = 0; suf = 0
prefix = ''
suffix = '.jpg'
n = 0
existerror = 0

test = 0
#print pad(5, 0)
#print pad(5, 99)
#print pad(5, 220)

args = sys.argv[1:]

i = 1; x = len(args)
while (x / 10) > 0:
  x = x / 10
  i = i + 1

if len(args) == 0:
  usage()
else:
  for arg in args:
    if arg == '-p': pre = 1
    elif pre:
      pre = 0
      prefix = arg
    elif arg == '-s': suf = 1
    elif suf:
      suf = 0
      suffix = arg
    elif os.path.isfile(arg):
      name =  prefix + pad(i, n) + suffix
      if not os.path.exists(name):
        print arg, '\t=>\t', name
        os.system('mv ' + arg + ' ' + name)
      else:
        existerror = existerror + 1
      n = n + 1
  if existerror:
    print 'Warning,', existerror, 'filenames already in use.  Did not overwrite!'