I needed a script to traverse my music collection and quickly update cuesheets with correct titles. Given all files in my collection are tagged with MusicBrainz archive, the best way to do so is reading flac files tags.

CUEupdater.py

#!/usr/bin/python3

# Author: ceres-c 2019-01-06
# Updates recursively cue files to reflect track's title present in flac files.

import os
from mutagen.flac import FLAC

def cueupdater (path, cuefile):
	title = None
	newdata = ''

	with open(os.path.join(path, cuefile), 'r', encoding="latin-1") as cuef:
		for line in cuef:
			if line.strip().startswith('FILE'):
				audioTags = FLAC(os.path.join(path, line.strip()[6:-6])) # Yep, hacky... I'm removing FILE and WAVE cue strings
				title = audioTags['title'][0] # Hacky again...
				title = title.replace('"', '')
				newdata += line

			elif line.strip().startswith('TITLE') and title is not None: # To account for first TITLE occurrence in cue's header
				newdata += '\tTITLE "' + title + '"\n'

			else:
				newdata += line

	with open(os.path.join(path, cuefile), 'w') as cuef:
		cuef.write(newdata)

for files in os.walk(os.getcwd()):
	for file in files:
		if '.cue' in file:
			cueupdater (root, file_)