From be30fc808e0915397bcfdca8d86b4038c54a7cca Mon Sep 17 00:00:00 2001
From: Kenneth Reitz <me@kennethreitz.com>
Date: Tue, 8 May 2012 10:24:37 -0400
Subject: [PATCH] env is written

---
 env.py | 52 ++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 52 insertions(+)
 create mode 100644 env.py

diff --git a/env.py b/env.py
new file mode 100644
index 0000000..1abf3dc
--- /dev/null
+++ b/env.py
@@ -0,0 +1,52 @@
+# -*- coding: utf-8 -*-
+
+from os import environ
+
+def lower_dict(d):
+    """Lower cases string keys in given dict."""
+
+    _d = {}
+
+    for k, v in d.iteritems():
+        try:
+            _d[k.lower()] = v
+        except AttributeError:
+            _d[k] = v
+
+    return _d
+
+
+def prefix(prefix):
+    """Returns a dictionary of all environment variables starting with
+    the given prefix, lower cased and stripped.
+    """
+
+    d = {}
+    e = lower_dict(environ.copy())
+
+    prefix = prefix.lower()
+
+    for k, v in e.iteritems():
+        try:
+            if k.startswith(prefix):
+                k = k[len(prefix):]
+                d[k] = v
+        except AttributeError:
+            print k
+            pass
+
+    return d
+
+
+def map(**kwargs):
+    """Returns a dictionary of the given keyword arguments mapped to their
+    values from the environment.
+    """
+
+    d = {}
+    e = lower_dict(environ.copy())
+
+    for k, v in kwargs.iteritems():
+        d[k] = e.get(v)
+
+    return d