Start support for config files.

diceware/config.py

+#  diceware -- passphrases to remember
+#  Copyright (C) 2015  Uli Fouquet
+#
+#  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/>.
+"""config -- diceware configuration
+
+`diceware` is configurable via commandline, configuration files and
+direct API calls.
+
+"""
+import argparse
+try:
+    import configparser                 # Python 3.x
+except ImportError:                     # pragma: no cover
+    import ConfigParser as configparser # Python 2.x
+
+
+OPTIONS_DEFAULTS = dict(
+    num=6,
+    caps=True,
+    specials=0,
+    delimiter="",
+    randomsource="system",
+    wordlist="en_8k",
+    )

tests/test_config.py

+from diceware.config import OPTIONS_DEFAULTS
+
+
+class TestConfigModule(object):
+    # tests for diceware.config
+
+    def test_defaults(self):
+        # there is a set of defaults for options available
+        assert OPTIONS_DEFAULTS is not None