From fd0b23a62995b800f5c44b720ef3f3ce2f1e545f Mon Sep 17 00:00:00 2001
From: Jose Diaz-Gonzalez <email@josediazgonzalez.com>
Date: Fri, 25 Dec 2015 08:27:25 -0500
Subject: [PATCH] Add RemapKeysFilter

---
 README.markdown                               |  1 +
 .../Dotenv/Filter/RemapKeysFilter.php         | 24 +++++++++++++++++++
 tests/josegonzalez/Dotenv/LoaderTest.php      | 22 +++++++++++++++++
 3 files changed, 47 insertions(+)
 create mode 100644 src/josegonzalez/Dotenv/Filter/RemapKeysFilter.php

diff --git a/README.markdown b/README.markdown
index 14fe545..ecbef0c 100644
--- a/README.markdown
+++ b/README.markdown
@@ -297,6 +297,7 @@ The following filters are built into php-dotenv.
 - `josegonzalez\Dotenv\Filter\CallableFilter`: Wraps a callable and invokes it upon the environment.
 - `josegonzalez\Dotenv\Filter\LowercaseKeyFilter`: Lowercases all the keys for an environment to a single-depth.
 - `josegonzalez\Dotenv\Filter\NullFilter`: Returns the environment data without any changes.
+- `josegonzalez\Dotenv\Filter\RemapKeysFilter`: Remaps specific keys in a `$config` array to a set of values at a single-depth.
 - `josegonzalez\Dotenv\Filter\UnderscoreArrayFilter`: Expands a flat array to a nested array. For example, `['0_Foo_Bar' => 'Far']` becomes `[['Foo' => ['Bar' => 'Far']]]`.
 - `josegonzalez\Dotenv\Filter\UppercaseFirstKeyFilter`: Uppercases the first letter for all the keys for an environment to a single-depth..
 - `josegonzalez\Dotenv\Filter\UrlParseFilter`: When there is a key with the suffix `_URL`, this filter uses `parse_url` to add extra data to the environment.
diff --git a/src/josegonzalez/Dotenv/Filter/RemapKeysFilter.php b/src/josegonzalez/Dotenv/Filter/RemapKeysFilter.php
new file mode 100644
index 0000000..790156e
--- /dev/null
+++ b/src/josegonzalez/Dotenv/Filter/RemapKeysFilter.php
@@ -0,0 +1,24 @@
+<?php
+
+namespace josegonzalez\Dotenv\Filter;
+
+class RemapKeysFilter
+{
+    /**
+     * Remaps specific keys in a $config array to a set of values at a single-depth.
+     *
+     * @param array $environment Array of environment data
+     * @param array $config Array of keys to remap to specific values
+     * @return array
+     */
+    public function __invoke(array $environment, array $config)
+    {
+        foreach ($config as $key => $value) {
+            if (array_key_exists($key, $environment)) {
+                $environment[$value] = $environment[$key];
+                unset($environment[$key]);
+            }
+        }
+        return $environment;
+    }
+}
diff --git a/tests/josegonzalez/Dotenv/LoaderTest.php b/tests/josegonzalez/Dotenv/LoaderTest.php
index 3f62891..24d26ba 100644
--- a/tests/josegonzalez/Dotenv/LoaderTest.php
+++ b/tests/josegonzalez/Dotenv/LoaderTest.php
@@ -331,6 +331,28 @@ public function testNullFilter()
         ), $this->Loader->toArray());
     }
 
+
+    /**
+     * @covers \josegonzalez\Dotenv\Filter\RemapKeysFilter::__invoke
+     */
+    public function testRemapKeysFilter()
+    {
+        $this->Loader->setFilters(array(
+            'josegonzalez\Dotenv\Filter\RemapKeysFilter' => array(
+                'FOO' => 'QUX'
+            ),
+        ));
+        $this->Loader->setFilepath($this->fixturePath . '.env');
+        $this->Loader->parse();
+        $this->Loader->filter();
+        $this->assertEquals(array(
+            'QUX' => 'bar',
+            'BAR' => 'baz',
+            'SPACED' => 'with spaces',
+            'EQUALS' => 'pgsql:host=localhost;dbname=test',
+        ), $this->Loader->toArray());
+    }
+
     /**
      * @covers \josegonzalez\Dotenv\Filter\UppercaseFirstKeyFilter::__invoke
      */