Add environment variables to context

Add environment variables to context so they
may be used in views.

Closes #72

statik/context.py

@@ -1,6 +1,8 @@
 # -*- coding: utf-8 -*-
 
 from __future__ import unicode_literals
+
+import os
 from copy import deepcopy, copy
 
 from future.utils import iteritems
@@ -67,6 +69,7 @@ def build(self, db=None, safe_mode=False, for_each_inst=None, extra=None):
         """Builds a dictionary that can be used as context for template rendering."""
         result = copy(self.initial)
         result.update(self.static)
+        result.update(os.environ)
         if self.dynamic:
             result.update(self.build_dynamic(db, extra=extra, safe_mode=safe_mode))
         if self.for_each and for_each_inst:

tests/modular/test_context.py

@@ -1,11 +1,11 @@
 # -*- coding:utf-8 -*-
-import unittest
+from unittest import mock, TestCase
 
 from statik.context import StatikContext
 from statik.database import StatikDatabase
 
 
-class TestStatikContext(unittest.TestCase):
+class TestStatikContext(TestCase):
     def test_build_context(self):
         context = StatikContext(dynamic={'render_elm': 'True if my_var > 10 else False'})
 
@@ -14,3 +14,11 @@ def test_build_context(self):
 
         result = context.build(db=StatikDatabase(models={}, data_path=''), extra={'my_var': 5})
         assert result.get('render_elm') is False
+
+    def test_env_var_in_context(self):
+        with mock.patch.dict('statik.context.os.environ',
+                             {'HOME': 'HOME!!'}):
+            context = StatikContext()
+
+            result = context.build(db=StatikDatabase(models={}, data_path=''))
+            self.assertEqual(result.get('HOME'), 'HOME!!')