Port calibredb show_metadata

src/calibre/db/cli/cmd_show_metadata.py

@@ -4,19 +4,54 @@
 
 from __future__ import absolute_import, division, print_function, unicode_literals
 
-readonly = False
+import os
+import sys
+
+from calibre import prints
+from calibre.ebooks.metadata.opf2 import OPFCreator
+
+readonly = True
 version = 0  # change this if you change signature of implementation()
 
 
-def implementation(db, notify_changes, *args):
-    is_remote = notify_changes is not None
-    is_remote
+def implementation(db, notify_changes, book_id):
+    with db.safe_read_lock:
+        if not db.has_id(book_id):
+            return
+        return db.get_metadata(book_id)
 
 
 def option_parser(get_parser):
-    pass
+    parser = get_parser(
+        _(
+            '''
+%prog show_metadata [options] id
+
+Show the metadata stored in the calibre database for the book identified by id.
+id is an id number from the search command.
+'''
+        )
+    )
+    parser.add_option(
+        '--as-opf',
+        default=False,
+        action='store_true',
+        help=_('Print metadata in OPF form (XML)')
+    )
+    return parser
 
 
 def main(opts, args, dbctx):
-    raise NotImplementedError('TODO: implement this')
+    if len(args) < 1:
+        raise SystemExit(_('You must specify an id'))
+    book_id = int(args[0])
+    mi = dbctx.run('show_metadata', book_id)
+    if mi is None:
+        raise SystemExit('Id #%d is not present in database.' % id)
+    if opts.as_opf:
+        mi = OPFCreator(os.getcwdu(), mi)
+        mi.render(sys.stdout)
+    else:
+        prints(unicode(mi))
+
     return 0