From 7f949a5018d77922891e12f134651590e6e78a6e Mon Sep 17 00:00:00 2001
From: topecongiro <seuchida@gmail.com>
Date: Tue, 6 Feb 2018 09:29:00 +0900
Subject: [PATCH] Explicitly disable colored output when it is not supported

---
 src/lib.rs | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/src/lib.rs b/src/lib.rs
index 2b89bde72c1..db05a24f979 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -615,7 +615,13 @@ pub fn format_input<T: Write>(
         ));
         Handler::with_emitter(true, false, silent_emitter)
     } else {
-        Handler::with_tty_emitter(ColorConfig::Auto, true, false, Some(codemap.clone()))
+        let supports_color = term::stderr().map_or(false, |term| term.supports_color());
+        let color_cfg = if supports_color {
+            ColorConfig::Auto
+        } else {
+            ColorConfig::Never
+        };
+        Handler::with_tty_emitter(color_cfg, true, false, Some(codemap.clone()))
     };
     let mut parse_session = ParseSess::with_span_handler(tty_handler, codemap.clone());