Very brittle command-line frontend

spotdl/command_line/helpers.py

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+from spotdl.metadata.providers import ProviderSpotify
+from spotdl.metadata.providers import ProviderYouTube
+from spotdl.metadata.embedders import EmbedderDefault
+from spotdl.lyrics.providers import LyricWikia
+from spotdl.lyrics.providers import Genius
+
+from spotdl.track import Track
+
+import spotdl.util
+
+import urllib.request
+import threading
+
+
+def search_metadata(track, lyrics=True):
+    youtube = ProviderYouTube()
+    if spotdl.util.is_spotify(track):
+        spotify = ProviderSpotify()
+        spotify_metadata = spotify.from_url(track)
+        # TODO: CONFIG.YML
+        #       Generate string in config.search_format
+        search_query = "{} - {}".format(
+            spotify_metadata["artists"][0]["name"],
+            spotify_metadata["name"]
+        )
+        youtube_metadata = youtube.from_query(search_query)
+        metadata = spotdl.util.merge(
+            youtube_metadata,
+            spotify_metadata
+        )
+    elif spotdl.util.is_youtube(track):
+        metadata = youtube.from_url(track)
+    else:
+        metadata = youtube.from_query(track)
+
+    return metadata
+
+
+def download_track(track, arguments):
+    metadata = search_metadata(track)
+    download_track_from_metadata(metadata, arguments)
+
+
+def download_track_from_metadata(metadata, arguments):
+    # TODO: CONFIG.YML
+    #       Exit here if config.dry_run
+
+    # TODO: CONFIG.YML
+    #       Check if test.mp3 already exists here
+
+    # log.info(log_fmt)
+
+    track = Track(metadata, cache_albumart=True)
+
+    # TODO: CONFIG.YML
+    #       Download tracks with name config.file_format
+
+    # TODO: CONFIG.YML
+    #       Append config.output_ext to config.file_format
+
+    # TODO: CONFIG.YML
+    #       Check config.overwrite here
+
+    filename = spotdl.util.format_string(
+        arguments.file_format,
+        metadata,
+        output_extension=arguments.output_ext
+    )
+    track.download_while_re_encoding(
+        filename,
+        target_encoding=arguments.output_ext
+    )
+
+    # TODO: CONFIG.YML
+    #       Skip metadata if config.no_metadata
+
+    track.apply_metadata(filename, encoding=arguments.output_ext)
+
+
+def download_tracks_from_file(path, arguments):
+    # FIXME: Can we make this function cleaner?
+
+    # log.info(
+    #     "Checking and removing any duplicate tracks "
+    #     "in reading {}".format(path)
+    # )
+    with open(path, "r") as fin:
+        # Read tracks into a list and remove any duplicates
+        tracks = fin.read().splitlines()
+
+    # Remove duplicates and empty elements
+    # Also strip whitespaces from elements (if any)
+    spotdl.util.remove_duplicates(tracks, condition=lambda x: x, operation=str.strip)
+
+    # Overwrite file
+    with open(path, "w") as fout:
+        fout.writelines(tracks)
+
+    next_track_metadata = threading.Thread(target=lambda: None)
+    next_track_metadata.start()
+    tracks_count = len(tracks)
+    current_iteration = 1
+
+    def mutable_assignment(mutable_resource, track):
+        mutable_resource["next_track"] = search_metadata(track)
+
+    metadata = {
+        "current_track": None,
+        "next_track": None,
+    }
+    while tracks_count > 0:
+        current_track = tracks.pop(0)
+        tracks_count -= 1
+        metadata["current_track"] = metadata["next_track"]
+        metadata["next_track"] = None
+        try:
+            if metadata["current_track"] is None:
+                metadata["current_track"] = search_metadata(current_track)
+            if tracks_count > 0:
+                next_track = tracks[0]
+                next_track_metadata = threading.Thread(
+                    target=mutable_assignment,
+                    args=(metadata, next_track)
+                )
+                next_track_metadata.start()
+
+            download_track_from_metadata(
+                metadata["current_track"],
+                log_fmt=(str(current_iteration) + ". {artist} - {track_name}")
+            )
+            current_iteration += 1
+            next_track_metadata.join()
+        except (urllib.request.URLError, TypeError, IOError) as e:
+            # log.exception(e.args[0])
+            # log.warning("Failed. Will retry after other songs\n")
+            tracks.append(current_track)
+        else:
+            # TODO: CONFIG.YML
+            #       Write track to config.write_sucessful
+            pass
+        finally:
+            with open(path, "w") as fout:
+                fout.writelines(tracks)
+