From a1f01419e2e6e5d637ec7afa31c0a1d95e0ea923 Mon Sep 17 00:00:00 2001
From: Jakob Unterwurzacher
Date: Sat, 11 Dec 2021 15:35:01 +0100
Subject: tlog: respect NO_COLOR

Fixes https://github.com/rfjakob/gocryptfs/issues/617
---
 Documentation/MANPAGE.md | 7 +++++++
 internal/tlog/log.go     | 4 +++-
 2 files changed, 10 insertions(+), 1 deletion(-)

diff --git a/Documentation/MANPAGE.md b/Documentation/MANPAGE.md
index 503d145..25434c9 100644
--- a/Documentation/MANPAGE.md
+++ b/Documentation/MANPAGE.md
@@ -673,6 +673,13 @@ the `-nofail` option for details).
 
     /tmp/cipher /tmp/plain fuse./usr/local/bin/gocryptfs nofail,allow_other,passfile=/tmp/password 0 0
 
+ENVIRONMENT VARIABLES
+=====================
+
+### NO_COLOR
+
+If `NO_COLOR` is set (regardless of value), colored output is disabled (see https://no-color.org/).
+
 EXIT CODES
 ==========
 
diff --git a/internal/tlog/log.go b/internal/tlog/log.go
index 5535ef3..3f27539 100644
--- a/internal/tlog/log.go
+++ b/internal/tlog/log.go
@@ -106,7 +106,9 @@ var Warn *toggledLogger
 var Fatal *toggledLogger
 
 func init() {
-	if term.IsTerminal(int(os.Stdout.Fd())) {
+	// Enable color output if we are connected to a terminal and NO_COLOR is
+	// unset ( https://no-color.org/ ).
+	if _, nocolor := os.LookupEnv("NO_COLOR"); !nocolor && term.IsTerminal(int(os.Stdout.Fd())) {
 		ColorReset = "\033[0m"
 		ColorGrey = "\033[2m"
 		ColorRed = "\033[31m"
-- 
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