feat: change index playlist extension to m3u

Change playlist of playlists endpoint extension from m3u8 to m3u.

README.md

@@ -54,22 +54,22 @@ Options:
 
 The following endpoints allow listing and downloading playlist as well as audio files:
 
-* `GET /playlists/index.m3u8[?uri-format=$url]`: Returns a playlist that contains the URLs of other playlists.
+* `GET /playlists/index.m3u[?uri-format=$url]`: Returns the playlist of playlists.
 * `GET /playlists/`: List available playlists.
-* `GET /playlists/*.m3u8[?uri-format=$url]`: Get/download a playlist.
+* `GET /playlists/*.m3u[?uri-format=$url]`: Get/download a playlist.
 * `GET /audio/`: List available audio files.
 * `GET /audio/*.opus`: Download/stream an audio file.
 
 The `uri-format` parameter allows specifying a playlist item URI template.
-Item attribute names prefixed with a `$` can be used as placeholders, e.g. `subsonic:track:$id`.
-`$url` is a built-in placeholder.
+Item field names prefixed with a `$` can be used as placeholders, e.g. `beets:library:track;$id`.
+`$url` is a built-in placeholder and the default value.
 
 The list endpoints return either a JSON or HTML response, supporting content type negotiation.
 A JSON response body looks as follows:
 ```json
 {
 	"directories": [{"name":"some-dir"}],
-	"files": [{"name":"Afrobeat", "url":"afrobeat.m3u8"}],
+	"files": [{"name":"afrobeat", "url":"afrobeat.m3u"}],
 }
 ```
 

beetsplug/webm3u/routes.py

@@ -15,7 +15,7 @@
 
 _format_regex = re.compile(r'\$[a-z0-9_]+')
 
-@bp.route('/playlists/index.m3u8')
+@bp.route('/playlists/index.m3u')
 def playlist_index():
     uri_format = request.args.get('uri-format')
     playlist_dir = playlist_provider().dir

beetsplug/webm3u/templates/index.html

@@ -18,7 +18,7 @@ <h1>Beets music library</h1>
   <li><a href="audio/">Audio files</a></li>
 </ul>
 <p>
-<a href="playlists/index.m3u8">Playlist of playlists</a>
+<a href="playlists/index.m3u">Playlist of playlists</a>
 </p>
 </body>
 </html>