From 3717d7c383e7038a963f0fcf0e047943e4c0c153 Mon Sep 17 00:00:00 2001
From: chzyer <0@0xdf.com>
Date: Tue, 21 Jun 2016 17:47:31 +0800
Subject: [PATCH] [terminal] fix when only stderr is tty (1>/dev/null)

---
 utils_unix.go | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/utils_unix.go b/utils_unix.go
index addc5ba..39c32a1 100644
--- a/utils_unix.go
+++ b/utils_unix.go
@@ -44,7 +44,11 @@ func getWidth(stdoutFd int) int {
 }
 
 func GetScreenWidth() int {
-	return getWidth(syscall.Stdout)
+	w := getWidth(syscall.Stdout)
+	if w < 0 {
+		w = getWidth(syscall.Stderr)
+	}
+	return w
 }
 
 // ClearScreen clears the console screen
@@ -53,7 +57,7 @@ func ClearScreen(w io.Writer) (int, error) {
 }
 
 func DefaultIsTerminal() bool {
-	return IsTerminal(syscall.Stdin) && IsTerminal(syscall.Stdout)
+	return IsTerminal(syscall.Stdin) && (IsTerminal(syscall.Stdout) || IsTerminal(syscall.Stderr))
 }
 
 func GetStdin() int {