new: Composer (TCOM) support

src/eyed3/id3/frames.py

@@ -27,6 +27,7 @@ class FrameException(Error):
 SUBTITLE_FID       = b"TIT3"                                            # noqa
 ARTIST_FID         = b"TPE1"                                            # noqa
 ALBUM_ARTIST_FID   = b"TPE2"                                            # noqa
+COMPOSER_FID       = b"TCOM"                                            # noqa
 ALBUM_FID          = b"TALB"                                            # noqa
 TRACKNUM_FID       = b"TRCK"                                            # noqa
 GENRE_FID          = b"TCON"                                            # noqa

src/eyed3/id3/tag.py

@@ -269,6 +269,21 @@ def _setAlbumArtist(self, val):
     def _getAlbumArtist(self):
         return self.getTextFrame(frames.ALBUM_ARTIST_FID)
 
+    @requireUnicode(1)
+    def _setComposer(self, val):
+        self.setTextFrame(frames.COMPOSER_FID, val)
+
+    def _getComposer(self):
+        return self.getTextFrame(frames.COMPOSER_FID)
+
+    @property
+    def composer(self):
+        return self._getComposer()
+
+    @composer.setter
+    def composer(self, v):
+        self._setComposer(v)
+
     @requireUnicode(1)
     def _setAlbum(self, val):
         self.setTextFrame(frames.ALBUM_FID, val)

src/eyed3/plugins/classic.py

@@ -84,6 +84,8 @@ def PositiveIntArg(i):
         g.add_argument("--track-offset", type=int, dest="track_offset",
                        metavar="N", help=ARGS_HELP["--track-offset"])
 
+        g.add_argument("--composer", type=UnicodeArg, dest="composer",
+                       metavar="STRING", help=ARGS_HELP["--composer"])
         g.add_argument("-d", "--disc-num", type=PositiveIntArg, dest="disc_num",
                        metavar="NUM", help=ARGS_HELP["--disc-num"])
         g.add_argument("-D", "--disc-total", type=PositiveIntArg,
@@ -575,7 +577,11 @@ def printTag(self, tag):
             printMsg("%s: %s" % (boldText("title"), title))
             printMsg("%s: %s" % (boldText("artist"), artist))
             printMsg("%s: %s" % (boldText("album"), album))
-            printMsg("%s: %s" % (boldText("album artist"), tag.album_artist))
+            if tag.album_artist:
+                printMsg("%s: %s" % (boldText("album artist"),
+                                     tag.album_artist))
+            if tag.composer:
+                printMsg("%s: %s" % (boldText("composer"), tag.composer))
 
             for date, date_label in [
                     (tag.release_date, "release date"),
@@ -737,20 +743,23 @@ def printTag(self, tag):
                 printMsg("\nTerms of Use (%s): %s" % (boldText("USER"),
                                                       tag.terms_of_use))
 
+            # --verbose
             if self.args.verbose:
                 printMsg("-" * self.terminal_width)
                 printMsg("%d ID3 Frames:" % len(tag.frame_set))
                 for fid in tag.frame_set:
                     frames = tag.frame_set[fid]
                     num_frames = len(frames)
                     count = " x %d" % num_frames if num_frames > 1 else ""
+                    total_bytes = 0
                     if not tag.isV1():
                         total_bytes = sum(
                                 tuple(frame.header.data_size + frame.header.size
-                                          for frame in frames))
+                                          for frame in frames if frame.header))
                     else:
                         total_bytes = 30
-                    printMsg("%s%s (%d bytes)" % (fid.decode("ascii"), count,
+                    if total_bytes:
+                        printMsg("%s%s (%d bytes)" % (fid.decode("ascii"), count,
                                                   total_bytes))
                 printMsg("%d bytes unused (padding)" %
                          (tag.file_info.tag_padding_size, ))
@@ -828,6 +837,7 @@ def handleEdits(self, tag):
                                          self.args.tagging_date)),
                 ("beats per minute", partial(tag._setBpm, self.args.bpm)),
                 ("publisher", partial(tag._setPublisher, self.args.publisher)),
+                ("composer", partial(tag._setComposer, self.args.composer)),
               ):
             if setFunc.args[0] is not None:
                 printWarning("Setting %s: %s" % (what, setFunc.args[0]))
@@ -1169,4 +1179,5 @@ def _getTemplateKeys():
                                  "modification times.",
         "--track-offset": "Increment/decrement the track number by [-]N. "
                           "This option is applied after --track=N is set.",
+        "--composer": "Set the composer's name.",
 }

src/eyed3/plugins/display.py

@@ -23,7 +23,7 @@
 
 from argparse import ArgumentTypeError
 
-from eyed3 import id3
+from eyed3 import id3, compat
 from eyed3.utils import console, formatSize, formatTime
 from eyed3.plugins import LoaderPlugin
 try:
@@ -63,7 +63,7 @@ def __compile(self):
             self.sub_patterns = self.__compile_asts(asts)
             self.__text = None
         except BaseException as parsing_error:
-            raise PatternCompileException(parsing_error.message)
+            raise PatternCompileException(compat.unicode(parsing_error))
 
     def __compile_asts(self, asts):
         patterns = []
@@ -315,6 +315,14 @@ def _get_output_for(self, audio_file):
         return audio_file.tag.album_artist
 
 
+class ComposerTagPattern(TagPattern):
+    NAMES = ["C", "composer"]
+    DESCRIPTION = "Composer"
+
+    def _get_output_for(self, audio_file):
+        return audio_file.tag.composer
+
+
 class TitleTagPattern(TagPattern):
     NAMES = ["t", "title"]
     DESCRIPTION = "Title"