config, and basic test

more tests to follow

kepi/config.py

@@ -1,4 +1,9 @@
 import argparse
+import configparser
+import os
+
+DEFAULT_CONFIG_FILENAME = '/etc/kepi/kepi.conf'
+CONFIG_SECTION = 'kepi'
 
 class Config:
 
@@ -18,11 +23,24 @@ class Config:
         else:
             raise KeyError(field)
 
+    def _load_config_file(self, filename):
+        conf = configparser.ConfigParser()
+        conf.read(filename, encoding='UTF-8')
+
+        for option in conf.items(CONFIG_SECTION):
+            self.settings[option] = conf.get(
+                    section = CONFIG_SECTION,
+                    option = option,
+                    )
+
     def parse_args(self, argparser):
 
         assert self.subcommands is not None
 
         self.argparser = argparser
+        argparser.add_argument(
+                '--config', '-C', default=None,
+                help='location of configuration file')
 
         self.subparsers = argparser.add_subparsers(
                 dest = 'command',
@@ -36,13 +54,17 @@ class Config:
 
         args = self.argparser.parse_args()
 
+        if args.config is None:
+            if os.path.exists(DEFAULT_CONFIG_FILENAME):
+                self._load_config_file(DEFAULT_CONFIG_FILENAME)
+        else:
+            self._load_config_file(args.config)
+
         for field in dir(args):
             if field.startswith('_'):
                 continue
             self.settings[field] = getattr(args, field)
 
-        # TODO here we will check the config file, and merge them in.
-
 config = Config.__new__(Config)
 
 def subcommand(fn):

test/test_config.py

@@ -0,0 +1,27 @@
+import sys
+import argparse
+from kepi.config import config, subcommand
+
+@subcommand
+def subcommands_for_testing(subparsers):
+    parser = subparsers.add_parser('wombat')
+
+    parser.add_argument(
+            'spong',
+            help=(
+                'the spong to wombat'
+            ),
+            )
+
+def test_config_add_subcommands():
+
+    old_argv = sys.argv
+    sys.argv = ['kepi', 'wombat', 'foo']
+
+    parser = argparse.ArgumentParser()
+    config.parse_args(parser)
+
+    assert config.command=='wombat'
+    assert config.spong=='foo'
+
+    sys.argv = old_argv