Fix style issues in qute-keepass

misc/userscripts/qute-keepass

@@ -17,10 +17,8 @@
 # You should have received a copy of the GNU General Public License
 # along with qutebrowser.  If not, see <http://www.gnu.org/licenses/>.
 
-# pylint: disable=bad-builtin
-
-USAGE = """This userscript allows for insertion of usernames and passwords from
-keepass databases using pykeepass. Since it is a userscript, it must be run from
+"""This userscript allows for insertion of usernames and passwords from keepass
+databases using pykeepass. Since it is a userscript, it must be run from
 qutebrowser.
 
 A sample invocation of this script is:
@@ -34,8 +32,8 @@ And a sample binding
 -p or --path is a required argument.
 
 --keyfile-path allows you to specify a keepass keyfile. If you only use a
-  keyfile, also add --no-password as well. Specifying --no-password without
-  --keyfile-path will lead to an error.
+keyfile, also add --no-password as well. Specifying --no-password without
+--keyfile-path will lead to an error.
 
 login information is inserted using :insert-text and :fake-key <Tab>, which
 means you must have a cursor in position before initiating this userscript. If
@@ -53,8 +51,11 @@ WARNING: The login details are viewable as plaintext in qutebrowser's debug log
 (qute://log) and could be compromised if you decide to submit a crash report!
 
 ********************!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!******************
+
 """
 
+# pylint: disable=bad-builtin
+
 import argparse
 import enum
 import functools
@@ -68,22 +69,29 @@ from PyQt5.QtWidgets import QApplication, QInputDialog, QLineEdit
 
 try:
     import pykeepass
-except ImportError:
-    print("pykeepass not found!", file=sys.stderr)
+except ImportError as e:
+    print("pykeepass not found: {}".format(str(e)), file=sys.stderr)
+
+    # Since this is a common error, try to print it to the FIFO if we can.
+    if 'QUTE_FIFO' in os.environ:
+        with open(os.environ['QUTE_FIFO'], 'w') as fifo:
+            fifo.write('message-error "pykeepass failed to be imported."\n')
+            fifo.flush()
     sys.exit(100)
 
 argument_parser = argparse.ArgumentParser(
-    description=__doc__,
+    description="Fill passwords using keepass.",
     formatter_class=argparse.RawDescriptionHelpFormatter,
-    epilog=USAGE)
+    epilog=__doc__)
 argument_parser.add_argument('url', nargs='?', default=os.getenv('QUTE_URL'))
 argument_parser.add_argument('--path', '-p', required=True,
                              help='Path to the keepass db.')
 argument_parser.add_argument('--keyfile-path', '-k', default=None,
                              help='Path to a keepass keyfile')
-argument_parser.add_argument('--no-password', action='store_true',
-                             help='True if no password is required.'
-                             'Only allowed with --keyfile-path')
+argument_parser.add_argument(
+    '--no-password', action='store_true',
+    help='Supply if no password is required to unlock this database. '
+    'Only allowed with --keyfile-path')
 argument_parser.add_argument(
     '--dmenu-invocation', '-d', default='dmenu',
     help='Invocation used to execute a dmenu-provider')
@@ -98,9 +106,9 @@ argument_parser.add_argument(
     '--io-encoding', '-i', default='UTF-8',
     help='Encoding used to communicate with subprocesses')
 group = argument_parser.add_mutually_exclusive_group()
-group.add_argument('--username-only', '-e',
+group.add_argument('--username-fill-only', '-e',
                    action='store_true', help='Only insert username')
-group.add_argument('--password-only', '-w',
+group.add_argument('--password-fill-only', '-w',
                    action='store_true', help='Only insert password')
 
 CMD_DELAY = 50
@@ -228,9 +236,9 @@ def run(args):
     username, password = candidate_to_secret(selection)
 
     insert_mode = ';; enter-mode insert' if args.insert_mode else ''
-    if args.username_only:
+    if args.username_fill_only:
         qute_command('insert-text {}{}'.format(username, insert_mode))
-    elif args.password_only:
+    elif args.password_fill_only:
         qute_command('insert-text {}{}'.format(password, insert_mode))
     else:
         # Enter username and password using insert-key and fake-key <Tab>