tlog: respect NO_COLOR

Fixes https://github.com/rfjakob/gocryptfs/issues/617

1 files changed, 3 insertions, 1 deletions

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"