playlists in description: round trip the description correctly

thrimshim/thrimshim/main.py

@@ -29,7 +29,7 @@ app.after_request(after_request)
 
 MAX_TITLE_LENGTH = 100 # Youtube only allows 100-character titles
 MAX_DESCRIPTION_LENGTH = 5000 # Youtube only allows 5000-character descriptions
-
+DESCRIPTION_PLAYLISTS_HEADER = "This video is part of the following playlists:"
 
 def cors(app):
 	"""WSGI middleware that sets CORS headers"""
@@ -194,19 +194,20 @@ def get_row(ident):
 				response['thumbnail_time'] = start
 
 	# remove any added headers or footers so round-tripping is a no-op
-	# TODO make work with playlist links in description
 	if (
 		app.title_header
 		and response["video_title"] is not None
 		and response["video_title"].startswith(app.title_header)
 	):
 		response["video_title"] = response["video_title"][len(app.title_header):]
-	if (
-		app.description_footer
-		and response["video_description"] is not None
-		and response["video_description"].endswith(app.description_footer)
-	):
-		response["video_description"] = response["video_description"][:-len(app.description_footer)]
+	description_playlist_re = re.compile(r"({}\n(- .* \[https://youtube.com/playlist\?list=[A-Za-z0-9_-]+\n)+)?{}$".format(
+		re.escape(DESCRIPTION_PLAYLISTS_HEADER),
+		re.escape(app.description_footer),
+	))
+	if response["video_description"] is not None:
+		match = description_playlist_re.search(response["video_description"])
+		if match:
+			response["video_description"] = response["video_description"][:match.start()]
 
 	logging.info('Row {} fetched'.format(ident))
 
@@ -275,7 +276,7 @@ def update_row(ident, editor=None):
 		return 'Row {} not found'.format(ident), 404
 	assert old_row['id'] == ident
 
-	playlists = query(conn, """ 
+	playlists = database.query(conn, """ 
 		SELECT playlist_id, name, tags
 		FROM playlists
 		WHERE show_in_description
@@ -290,12 +291,12 @@ def update_row(ident, editor=None):
 	]
 
 	# Include headers and footers
-	playlist_info = get_playlist_info(conn)
 	new_row['video_title'] = app.title_header + new_row['video_title']
-	description_lines = ["This video is part of the following playlists:"]
+	# NOTE: If you change this format, you need to also change the regex that matches this
+	# on the GET handler.
+	description_lines = [DESCRIPTION_PLAYLISTS_HEADER]
 	description_lines += [
-		# TODO check this url
-		"{} [https://youtube.com/playlist/{}]".format(playlist.name, playlist.playlist_id)
+		"- {} [https://youtube.com/playlist?list={}]".format(playlist.name, playlist.playlist_id)
 		for playlist in playlists
 	]
 	description_lines.append(app.description_footer)