Simplify package structure

tfw/config/__init__.py

@@ -0,0 +1 @@
+from .envvars import TFWENV, TAOENV

tfw/config/envvars.py

@@ -0,0 +1,5 @@
+from .lazy_environment import LazyEnvironment
+
+
+TFWENV = LazyEnvironment('TFW_', 'tfwenvtuple').environment
+TAOENV = LazyEnvironment('AVATAO_', 'taoenvtuple').environment

tfw/config/lazy_environment.py

@@ -0,0 +1,22 @@
+from collections import namedtuple
+from os import environ
+
+from tfw.internals.lazy import lazy_property
+
+
+class LazyEnvironment:
+    def __init__(self, prefix, tuple_name):
+        self._prefix = prefix
+        self._tuple_name = tuple_name
+
+    @lazy_property
+    def environment(self):
+        return self.prefixed_envvars_to_namedtuple()
+
+    def prefixed_envvars_to_namedtuple(self):
+        envvars = {
+            envvar.replace(self._prefix, '', 1): environ.get(envvar)
+            for envvar in environ.keys()
+            if envvar.startswith(self._prefix)
+        }
+        return namedtuple(self._tuple_name, envvars)(**envvars)