From 87ecd4f75b0441e986c6cda4cc8a0db07c61ca71 Mon Sep 17 00:00:00 2001
From: Ben Noordhuis <info@bnoordhuis.nl>
Date: Sat, 31 May 2014 21:55:18 +0200
Subject: [PATCH] libtest: Only colorize output if stdout is a tty

Fixes #14570.
---
 src/libtest/lib.rs | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/src/libtest/lib.rs b/src/libtest/lib.rs
index bc69dc442dc..35911949ea4 100644
--- a/src/libtest/lib.rs
+++ b/src/libtest/lib.rs
@@ -868,7 +868,9 @@ fn should_sort_failures_before_printing_them() {
     assert!(apos < bpos);
 }
 
-fn use_color() -> bool { return get_concurrency() == 1; }
+fn use_color() -> bool {
+    get_concurrency() == 1 && io::stdout().get_ref().isatty()
+}
 
 #[deriving(Clone)]
 enum TestEvent {