Add export command to calibredb

src/calibre/library/cli.py

@@ -362,10 +362,42 @@ show_metadata command.
     id, opf = int(args[1]), open(args[2], 'rb')
     do_set_metadata(get_db(dbpath, opts), id, opf)
     return 0
+
+def do_export(db, ids, dir, single_dir, by_author):
+    if ids is None:
+        ids = db.all_ids()
+    db.export_to_dir(dir, ids, byauthor=by_author, single_dir=single_dir, index_is_id=True)
+        
+def command_export(args, dbpath):
+    parser = get_parser(_('''\
+%prog export [options] ids 
+
+Export the books specified by ids (a comma separated list) to the filesystem.
+The export operation saves all formats of the book, its cover and metadata (in 
+an opf file). You can get id numbers from the list command. 
+'''))
+    parser.add_option('--all', default=False, action='store_true',
+                      help=_('Export all books in database, ignoring the list of ids.'))
+    parser.add_option('--to-dir', default='.', 
+                      help=(_('Export books to the specified directory. Default is')+' %default'))
+    parser.add_option('--single-dir', default=False, action='store_true',
+                      help=_('Export all books into a single directory'))
+    parser.add_option('--by-author', default=False, action='store_true',
+                      help=_('Create file names as author - title instead of title - author'))
+    opts, args = parser.parse_args(sys.argv[1:]+args)
+    if (len(args) < 2 and not opts.all):
+        parser.print_help()
+        print
+        print >>sys.stderr, _('You must specify some ids or the %s option')%'--all'
+        return 1
+    ids = None if opts.all else map(int, args[1].split(','))
+    dir = os.path.abspath(os.path.expanduser(opts.to_dir))
+    do_export(get_db(dbpath, opts), ids, dir, opts.single_dir, opts.by_author)
+    return 0
     
 def main(args=sys.argv):
     commands = ('list', 'add', 'remove', 'add_format', 'remove_format', 
-                'show_metadata', 'set_metadata')
+                'show_metadata', 'set_metadata', 'export')
     parser = OptionParser(_(
 '''\
 %%prog command [options] [arguments]

src/calibre/library/database.py

@@ -1384,6 +1384,9 @@ ALTER TABLE books ADD COLUMN isbn TEXT DEFAULT "" COLLATE NOCASE;
         self.conn.execute('VACUUM;')
         self.conn.commit()
     
+    def all_ids(self):
+        return [i[0] for i in self.conn.execute('SELECT id FROM books').fetchall()]
+    
     def export_to_dir(self, dir, indices, byauthor=False, single_dir=False,
                       index_is_id=False):
         if not os.path.exists(dir):