Rename all images in a directory to timestamp when they have been taken. also rename existing sidecar files

rename_photos.py

#!/usr/bin/env python
#
# Rename all images in a directory to timestamp when they have been taken.
# also rename existing sidecar files

import sys
import glob
import pyexiv2
import os.path
import shutil

FILE_EXTENSIONS=('jpg', 'jpeg', 'crw', 'cr2', 'dng', 'arw')

def print_usage():
    print("Rename all images in a directory to timestamp when they have been taken.")
    print(sys.argv[0] + " DIRECTORY")

def insensitive_glob(pattern):
    def either(c):
        return '[%s%s]'%(c.lower(),c.upper()) if c.isalpha() else c
    return glob.glob(''.join(map(either,pattern)))

def move(src, dest):
    print("moving {0} --> {1}".format(src, dest))
    if os.path.exists(dest):
        print("{0} already exists. Would be replaced using {1}".format(dest, src))
        sys.exit(1)
    shutil.move(src, dest)

def rename_photos(directory):
    if not os.path.isdir(directory):
        print("{0} is not a directory".format(directory))
        sys.exit(1)
    for ext in FILE_EXTENSIONS:
        for filename in insensitive_glob("{0}/*.{1}".format(directory, ext)):
            #print(filename)
            metadata = pyexiv2.ImageMetadata(filename)
            metadata.read()
            if metadata and 'Exif.Image.DateTime' in metadata.exif_keys:
                base_name, extension = os.path.splitext(filename)

                # use more precision for fast bulk shots
                subsectime = "_00"
                if "Exif.Photo.SubSecTime" in metadata.exif_keys:
                    subsectime = "_" + str(metadata['Exif.Photo.SubSecTime'].value)

                new_name = os.path.join(os.path.dirname(filename),
                        metadata['Exif.Image.DateTime'].value.strftime("%Y%m%d_%H%M%S") + subsectime + extension)
                if filename != new_name:
                    move(filename, new_name)
                    for sidecarfile in glob.glob("{0}.*".format(filename)):
                        sbext = os.path.basename(sidecarfile)[len(os.path.basename(filename))+1:]
                        move(sidecarfile, new_name+"."+sbext)

                

def run():
    if len(sys.argv) < 2:
        print_usage()
        sys.exit(1)
    for directory in sys.argv[1:]:
        rename_photos(directory)


if __name__ == "__main__":
    run()