0filename_fixer.py

#!/usr/bin/python

'''

This solves a problem in DJI drone cameras where the file numbers never go above DJI_0999.JPG.

This will add 1,000,000 to the file number. For example it'll change DJI_0999.JPG to DJI_1000999.JPG

And it's smart enough to know that the file has already been processed (won't add 1,000,000 to the file
number if the number is already above 1,000,000).

It's also smart enough to handle files with extra text and numbers added, like "DJI_0088 - Part 2.MP4"

-wrybread@gmail.com 4/30/2023

'''



from __future__ import print_function

import sys, os, re


# how much to increment the file number by
increment_amount = 1000000

# Where are the files to process? (Default is directory of script)
directory = os.path.dirname( os.path.abspath(sys.argv[0]) )



#-------------------------------------------

listing = os.listdir(directory)

for f in listing:

    full_filename_path = os.path.join(directory, f)

    if f[:4] == "DJI_": 

        # gets the number in the filename. For example "DJI_0991.MP4" and "DJI_0991 - part 2.MP4" both return "0991"
        file_number = re.findall('DJI_(.+?)\W', f) [0]

        file_number_int = int(file_number)

        if file_number_int < 1000:

            # increment it
            new_file_number = file_number_int + increment_amount
            
            # re-compose the filename (there's probably a more graceful way to do this)
            new_filename = "DJI_" + str(new_file_number) + f.replace("DJI_"+file_number, "")

            new_filename_path = os.path.join(directory, new_filename)

            print ("Renaming %s to %s" % (f, new_filename) ) 

            # rename it! (comment out for testing obviously)
            os.rename(full_filename_path, new_filename_path)