Change `songs.Song` signature

Datadir is now an optional argument, and can be omitted to ignore cache

patacrep/content/song.py

@@ -87,9 +87,9 @@ def parse(keyword, argument, contentlist, config):
                                 ))
                         continue
                     renderer = SongRenderer(plugins[extension](
-                        songdir.datadir,
                         filename,
                         config,
+                        datadir=songdir.datadir,
                         ))
                     songlist.append(renderer)
                     config["_languages"].update(renderer.song.languages)

patacrep/songs/__init__.py

@@ -95,9 +95,12 @@ class Song:
         "_version",
         ]
 
-    def __init__(self, datadir, subpath, config):
-        self.fullpath = os.path.join(datadir, subpath)
-        self.datadir = datadir
+    def __init__(self, subpath, config, *, datadir=None):
+        if datadir is None:
+            self.datadir = ""
+        else:
+            self.datadir = datadir
+        self.fullpath = os.path.join(self.datadir, subpath)
         self.encoding = config["encoding"]
         self.config = config
 
@@ -131,7 +134,6 @@ class Song:
         self._parse(config)
 
         # Post processing of data
-        self.datadir = datadir
         self.subpath = subpath
         self.unprefixed_titles = [
             unprefixed_title(

patacrep/songs/convert/__main__.py

@@ -51,7 +51,7 @@ if __name__ == "__main__":
         sys.exit(1)
 
     for file in song_files:
-        song = song_parsers[source]("", file, DEFAULT_CONFIG)
+        song = song_parsers[source](file, DEFAULT_CONFIG)
         try:
             destname = "{}.{}".format(".".join(file.split(".")[:-1]), dest)
             if os.path.exists(destname):

test/test_chordpro/test_parser.py

@@ -55,7 +55,7 @@ class FileTestMeta(type):
                 chordproname = "{}.source".format(base)
                 with disable_logging():
                     self.assertMultiLineEqual(
-                        ChordproSong(None, chordproname, DEFAULT_CONFIG).render(
+                        ChordproSong(chordproname, DEFAULT_CONFIG).render(
                             output=chordproname,
                             output_format=LANGUAGES[dest],
                             ).strip(),