wip: make metadata optional

src/rupert/main.py

@@ -64,7 +64,10 @@ class Status:
             return Text('Done!')
 
 
-def format_release(release: Release) -> str:
+def format_release(release: Optional[Release]) -> str:
+    if release is None:
+        return '[bright_yellow]Unknown[/bright_yellow]'
+
     more_info = [
         '[bright_blue]{} disc(s)[/bright_blue]'.format(
             len(release.medium_list)
@@ -106,13 +109,14 @@ def prompt_menu(console: Console, choices: Iterable[Any]) -> int:
             console.print(f'[red]Invalid selection: {i}[/red]')
             continue
         return i - 1
+    assert False, 'unreachable'
 
 
-def prompt_release(console: Console, drive: DiscDrive) -> Release:
+def prompt_release(console: Console, drive: DiscDrive) -> Optional[Release]:
     releases = get_releases_from_disc(drive.get_disc()).release_list
     if not releases:
         console.print('[red]Could not find a matching MusicBrainz release')
-        raise SystemExit(1)
+        return None
     if len(releases) == 1:
         return releases[0]
     console.print(
@@ -181,12 +185,12 @@ def run(
         release = get_release_by_id(mbid)
     else:
         release = prompt_release(console, dev)
-    if not sys.stdout.isatty():
+    if release and not sys.stdout.isatty():
         print(f'{release.artist_credit_phrase} - {release.title}')
     console.print(f'Ripping {format_release(release)}')
 
-    num_discs = len(release.medium_list)
-    if len(release.medium_list) > 1:
+    if release and len(release.medium_list) > 1:
+        num_discs = len(release.medium_list)
         discno = prompt_select_disc(console, num_discs)
     else:
         discno = 0

src/rupert/ripper.py

@@ -173,7 +173,7 @@ class ProcessThread(threading.Thread):
 
 
 class EncodeThread(threading.Thread):
-    def __init__(self, release: Release, discno: int, q: ProcessQueue) -> None:
+    def __init__(self, release: Optional[Release], discno: int, q: ProcessQueue) -> None:
         super().__init__(name='EncodeThread')
         self.release = release
         self.discno = discno
@@ -207,11 +207,15 @@ class EncodeThread(threading.Thread):
 
         log.info('Adding tags to %s', filename)
         trackno = int(filename[5:7])
+        if not self.release:
+            log.warning('Cannot tag track %d: no release metadata', trackno)
+            return
         artist = self.release.artist_credit[0].artist
         album = self.release.title
         medium = self.release.medium_list[self.discno]
         track = medium.track_list[trackno - 1]
         tags = mutagen.File(filename, easy=True)
+        assert tags
         tags['tracknumber'] = str(trackno)
         tags['artist'] = tags['albumartist'] = artist.name
         tags['album'] = album
@@ -258,7 +262,7 @@ class Ripper:
     def __init__(
         self,
         device: DiscDrive,
-        release: Release,
+        release: Optional[Release],
         discno: int,
         tracks: Optional[TrackList] = None,
         use_libcdio: bool = False,
@@ -293,14 +297,17 @@ class Ripper:
 
     def rip(self) -> Iterable[StatusMessage]:
         start = time.monotonic()
-        dirname = safe_name(
-            f'{self.release.artist_credit_phrase} - {self.release.title}'
-        )
+        if self.release:
+            dirname = safe_name(
+                f'{self.release.artist_credit_phrase} - {self.release.title}'
+            )
+        else:
+            dirname = 'Unknown Artist - Unknown Album'
         if not os.path.isdir(dirname):
             log.info('Creating directory: %s', dirname)
             os.mkdir(dirname)
         os.chdir(dirname)
-        if len(self.release.medium_list) > 1:
+        if self.release and len(self.release.medium_list) > 1:
             subdirname = f'Disc {self.discno + 1}'
             if not os.path.isdir(subdirname):
                 log.info('Creating directory: %s', subdirname)