env({lowerCase:true}) option to make it possible to get() keys in lower case

lib/nconf/stores/env.js

@@ -23,6 +23,7 @@ var Env = exports.Env = function (options) {
   this.readOnly  = true;
   this.whitelist = options.whitelist || [];
   this.separator = options.separator || '';
+  this.lowerCase = options.lowerCase || false;
 
   if (typeof options.match === 'function'
       && typeof options !== 'string') {
@@ -56,8 +57,16 @@ Env.prototype.loadSync = function () {
 Env.prototype.loadEnv = function () {
   var self = this;
 
+  var env = process.env;
+
+  if (this.lowerCase) {
+    Object.keys(env).forEach(function (key) {
+      env[key.toLowerCase()] = env[key];
+    });
+  }
+
   this.readOnly = false;
-  Object.keys(process.env).filter(function (key) {
+  Object.keys(env).filter(function (key) {
     if (self.match && self.whitelist.length) {
       return key.match(self.match) || self.whitelist.indexOf(key) !== -1
     }
@@ -69,10 +78,10 @@ Env.prototype.loadEnv = function () {
     }
   }).forEach(function (key) {
     if (self.separator) {
-      self.set(common.key.apply(common, key.split(self.separator)), process.env[key]);
+      self.set(common.key.apply(common, key.split(self.separator)), env[key]);
     }
     else {
-      self.set(key, process.env[key]);
+      self.set(key, env[key]);
     }
   });
 

test/complete-test.js

@@ -123,4 +123,26 @@ vows.describe('nconf/multiple-stores').addBatch({
       nconf.remove('env');
     }
   }
+}).addBatch({
+  // Threw this in it's own batch to make sure it's run separately from the
+  // sync check
+  "When using env with lowerCase:true": {
+    topic: function () {
+      var that = this;
+      helpers.cp(complete, completeTest, function () {
+        nconf.env({ lowerCase: true });
+        that.callback();
+      });
+    },
+    "env vars": {
+      "keys also available as lower case": function () {
+        Object.keys(process.env).forEach(function (key) {
+          assert.equal(nconf.get(key.toLowerCase()), process.env[key]);
+        });
+      }
+    },
+    teardown: function () {
+      nconf.remove('env');
+    }
+  }
 }).export(module);