Add some client-side filtering/sorting of releases

If the MusicBrainz API won't do this for us, let's do it ourselves. This
significantly improves the quality of the search results when searching
for things that include a release.

requirements.in

@@ -27,5 +27,6 @@ requests
 sentry-sdk[flask]
 sqlalchemy>=1.2.0
 SQLAlchemy-Utils
+thefuzz
 Unidecode
 -e git+https://github.com/wuvt/python-musicbrainzngs#egg=musicbrainzngs

requirements.txt

@@ -1,6 +1,6 @@
 #
-# This file is autogenerated by pip-compile with python 3.9
-# To update, run:
+# This file is autogenerated by pip-compile with Python 3.9
+# by the following command:
 #
 #    pip-compile
 #
@@ -148,6 +148,8 @@ pytz==2021.1
     #   flask-restful
     #   google-api-core
     #   tzlocal
+rapidfuzz==3.5.2
+    # via thefuzz
 redis==3.5.3
     # via -r requirements.in
 requests==2.25.1
@@ -179,6 +181,8 @@ sqlalchemy==1.4.14
     #   sqlalchemy-utils
 sqlalchemy-utils==0.37.2
     # via -r requirements.in
+thefuzz==0.20.0
+    # via -r requirements.in
 tzlocal==2.1
     # via apscheduler
 unidecode==1.2.0

trackman/api/v1/track.py

@@ -1,5 +1,6 @@
 from flask import request, session, current_app
 from flask_restful import abort
+from thefuzz import fuzz, process
 from trackman import db, models
 from trackman.forms import TrackAddForm
 from trackman.lib import find_or_add_track
@@ -188,14 +189,15 @@ def get(self):
                 db.func.lower(models.Track.album) == db.func.lower(album))
             musicbrainz_search['release'] = album
 
-        label = request.args.get('label', '').strip()
-        if len(label) > 0:
-            somesearch = True
-            tracks = tracks.filter(
-                db.func.lower(models.Track.label) == db.func.lower(label))
+        # FIXME: disabled since MusicBrainz cannot search by label
+        #label = request.args.get('label', '').strip()
+        #if len(label) > 0:
+        #    somesearch = True
+        #    tracks = tracks.filter(
+        #        db.func.lower(models.Track.label) == db.func.lower(label))
 
         # This means there was a bad search, stop searching
-        # FIXME: MusicBrainz cannot search on label
+        # FIXME: MusicBrainz cannot search by label
         if somesearch is False:
             return {
                 'success': False,
@@ -205,10 +207,23 @@ def get(self):
 
         results = []
 
+        def process_release(r):
+            if type(r) == dict:
+                return r['title']
+            else:
+                return r
+
         # Search MusicBrainz
         mb_results = musicbrainzngs.search_recordings(**musicbrainz_search)
         for recording in mb_results['recording-list']:
-            for release in recording['release-list']:
+            all_releases = [r for r in recording['release-list']]
+            if len(album) > 0:
+                releases = process.extract(album, all_releases,
+                                           processor=process_release)
+            else:
+                releases = [(r, 0) for r in all_releases]
+
+            for release, _ in releases:
                 t = models.Track(
                     title=recording['title'],
                     album=release['title'],