From b7fb60494d881a90e78674fced037a97626f458f Mon Sep 17 00:00:00 2001
From: Jordi Boggiano <j.boggiano@seld.be>
Date: Sun, 11 Nov 2012 15:05:27 +0100
Subject: [PATCH] Add handling for backspace chars in BufferIO

---
 src/Composer/IO/BufferIO.php | 15 ++++++++++++++-
 1 file changed, 14 insertions(+), 1 deletion(-)

diff --git a/src/Composer/IO/BufferIO.php b/src/Composer/IO/BufferIO.php
index 3ab51d34b..8e1818a97 100644
--- a/src/Composer/IO/BufferIO.php
+++ b/src/Composer/IO/BufferIO.php
@@ -40,6 +40,19 @@ class BufferIO extends ConsoleIO
     {
         fseek($this->output->getStream(), 0);
 
-        return stream_get_contents($this->output->getStream());
+        $output = stream_get_contents($this->output->getStream());
+
+        $output = preg_replace_callback("{(?<=^|\n|\x08)(.+?)(\x08+)}", function ($matches) {
+            $pre = strip_tags($matches[1]);
+
+            if (strlen($pre) === strlen($matches[2])) {
+                return '';
+            }
+
+            // TODO reverse parse the string, skipping span tags and \033\[([0-9;]+)m(.*?)\033\[0m style blobs
+            return rtrim($matches[1])."\n";
+        }, $output);
+
+        return $output;
     }
 }