From 7bd0c5abdd96ecc0ed402d95cb38d1190161986b Mon Sep 17 00:00:00 2001
From: Rob Bast <rob.bast@gmail.com>
Date: Thu, 1 Oct 2015 15:05:17 +0200
Subject: [PATCH] itteratively expand key and attempt to match

fixes #4459 (also)
---
 src/Composer/Command/ConfigCommand.php | 20 +++++++++++---------
 1 file changed, 11 insertions(+), 9 deletions(-)

diff --git a/src/Composer/Command/ConfigCommand.php b/src/Composer/Command/ConfigCommand.php
index 2b7fd4846..5d3823b67 100644
--- a/src/Composer/Command/ConfigCommand.php
+++ b/src/Composer/Command/ConfigCommand.php
@@ -238,17 +238,19 @@ EOT
             } elseif (strpos($settingKey, '.')) {
                 $bits = explode('.', $settingKey);
                 $data = $data['config'];
+                $match = false;
                 foreach ($bits as $bit) {
-                    if (isset($data[$bit])) {
-                        $data = $data[$bit];
-                    } elseif (isset($data[implode('.', $bits)])) {
-                        // last bit can contain domain names and such so try to join whatever is left if it exists
-                        $data = $data[implode('.', $bits)];
-                        break;
-                    } else {
-                        throw new \RuntimeException($settingKey.' is not defined');
+                    $key = isset($key) ? $key.'.'.$bit : $bit;
+                    $match = false;
+                    if (isset($data[$key])) {
+                        $match = true;
+                        $data = $data[$key];
+                        unset($key);
                     }
-                    array_shift($bits);
+                }
+
+                if (!$match) {
+                    throw new \RuntimeException($settingKey.' is not defined.');
                 }
 
                 $value = $data;