Add "beet export --album" (matching "beet info --album")

beetsplug/export.py

@@ -87,6 +87,10 @@ class ExportPlugin(BeetsPlugin):
             '-l', '--library', action='store_true',
             help='show library fields instead of tags',
         )
+        cmd.parser.add_option(
+            '-a', '--album', action='store_true',
+            help='show album fields instead of tracks (implies "--library")',
+        )
         cmd.parser.add_option(
             '--append', action='store_true', default=False,
             help='if should append data to the file',
@@ -121,14 +125,20 @@ class ExportPlugin(BeetsPlugin):
             }
         )
 
-        items = []
-        data_collector = library_data if opts.library else tag_data
+        if opts.library or opts.album:
+            data_collector = library_data
+        else:
+            data_collector = tag_data
 
         included_keys = []
         for keys in opts.included_keys:
             included_keys.extend(keys.split(','))
 
-        for data_emitter in data_collector(lib, ui.decargs(args)):
+        items = []
+        for data_emitter in data_collector(
+                lib, ui.decargs(args),
+                album=opts.album,
+        ):
             try:
                 data, item = data_emitter(included_keys or '*')
             except (mediafile.UnreadableFileError, OSError) as ex:

docs/changelog.rst

@@ -36,6 +36,7 @@ Other new things:
 * :doc:`/plugins/unimported`: Support excluding specific
   subdirectories in library.
 * :doc:`/plugins/info`: Support ``--album`` flag.
+* :doc:`/plugins/export`: Support ``--album`` flag.
 
 Bug fixes:
 

docs/plugins/export.rst

@@ -34,6 +34,9 @@ The ``export`` command has these command-line options:
 * ``--library`` or ``-l``: Show data from the library database instead of the
   files' tags.
 
+* ``--album`` or ``-a``: Show data from albums instead of tracks (implies
+  ``--library``).
+
 * ``--output`` or ``-o``: Path for an output file. If not informed, will print
   the data in the console.