--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/gamelib/config.py	Sat Nov 21 11:18:08 2009 +0000
@@ -0,0 +1,54 @@
+# level.py
+
+from ConfigParser import RawConfigParser
+from optparse import OptionParser
+
+class Config(object):
+    """Container for various global configuration knobs and levers."""
+
+    valid_options = {
+        'sound': {'type': 'boolean', 'default': 'true'},
+        'level_name': {'type': 'string', 'default': 'two_weeks'},
+        }
+
+    config_filename = 'config.ini'
+
+    def configure(self, params=None):
+        self._config = RawConfigParser(dict(
+                [(k, v['default']) for k, v in self.valid_options.items() if 'default' in v]
+            ))
+        self._config.add_section('Options')
+        self._set_up_params(params)
+        self._config.read(self.config_filename)
+        self._process_params()
+
+    def _set_up_params(self, params):
+        parser = OptionParser()
+        parser.add_option("-c", "--config", metavar="FILE", dest="config_filename",
+                          help="read configuration from FILE")
+        parser.add_option("-l", "--level", metavar="LEVEL", dest="level_name",
+                          help="select level LEVEL")
+        parser.add_option("--sound", action="store_const", const="on", dest="sound",
+                          help="enable sound")
+        parser.add_option("--no-sound", action="store_const", const="off", dest="sound",
+                          help="disable sound")
+        (self._opts, _) = parser.parse_args(params or [])
+        self.config_filename = self._opts.config_filename or self.config_filename
+
+    def _process_params(self):
+        for name in self.valid_options:
+            opt = getattr(self._opts, name)
+            if opt is not None:
+                self._config.set('Options', name, opt)
+
+    def __getattr__(self, name):
+        if name not in self.valid_options:
+            raise AttributeError(name)
+        get_methods = {
+            'string': lambda n: self._config.get('Options', n),
+            'boolean': lambda n: self._config.getboolean('Options', n),
+            }
+        return get_methods[self.valid_options[name].get('type', 'string')](name)
+
+# Here's a global variable. Don't try this at home, kids!
+config = Config()