Improve logging

requirements.txt
Small UI fixes

lector/logger.py

@@ -0,0 +1,54 @@
+# This file is a part of Lector, a Qt based ebook reader
+# Copyright (C) 2017-2019 BasioMeusPuga
+
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+
+# You should have received a copy of the GNU General Public License
+# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+import os
+import logging
+
+from PyQt5 import QtCore
+
+
+def init_logging(cli_arguments):
+    # This needs a separate 'Lector' in the os.path.join because
+    # application name isn't explicitly set in this module
+    location_prefix = os.path.join(
+        QtCore.QStandardPaths.writableLocation(QtCore.QStandardPaths.AppDataLocation),
+        'Lector')
+    os.makedirs(location_prefix, exist_ok=True)
+    logger_filename = os.path.join(location_prefix, 'Lector.log')
+
+    log_level = 30  # Warning and above
+    # Set log level according to command line arguments
+    try:
+        if cli_arguments[1] == 'debug':
+            log_level = 10  # Debug and above
+            print('Debug logging enabled')
+            try:
+                os.remove(logger_filename)  # Remove old log for clarity
+            except FileNotFoundError:
+                pass
+    except IndexError:
+        pass
+
+    # Create logging object
+    logging.basicConfig(
+        filename=logger_filename,
+        filemode='a',
+        format='%(asctime)s,%(msecs)d %(name)s %(levelname)s %(message)s',
+        datefmt='%Y/%m/%d  %H:%M:%S',
+        level=log_level)
+    logging.addLevelName(60, 'HAMMERTIME')  ## Messages that MUST be logged
+
+    return logging.getLogger('lector.main')