#!/usr/bin/env python

# This script requires EXIF.py, available at:
# http://home.cfl.rr.com/genecash/digital_camera/EXIF.py
#
# Example usages: rename-by-exif-date.py *.JPG
#                 rename-by-exif-date.py 100CANON/

import os, sys, glob, EXIF

# fix EXIF date strings into usable filenames
def mungedate(date):
	date = str(date)
	date = date.replace(' ', '_')
	date = date.replace(':', '-')
	return date

# make a list of files from command line args
filelist = []
for i in sys.argv[1:]:
	if os.path.isdir(i):
		filelist = filelist + (glob.glob(os.path.join(i, '*.*')))
	elif os.path.isfile(i):
		filelist.append(i)

# get the EXIF data and rename by date
for pathname in filelist:
	# status
	print "Renaming %s..." % pathname

	# name/path parts
	dirname, filename = os.path.split(pathname)
	basename, extension = os.path.splitext(filename)

	# open and get EXIF data
	f = open(pathname, 'rb')
	tags = EXIF.process_file(f)

	# rename
	if tags.has_key('EXIF DateTimeOriginal'):
		newname = mungedate(tags['EXIF DateTimeOriginal'])
		os.rename(pathname, os.path.join(dirname, newname)+extension.lower())