Respect the NO_COLOR environment variable if it is set.

If set, this will turn off colourization of the output.

See https://no-color.org/

Fixes #90

issues/issue.go

@@ -60,7 +60,7 @@ func (issue *Issue) text() string {
 	return issue.Message
 }
 
-// Print to stdout with colour
+// Print to stdout with optional colour (controlled by color.NoColor - see main())
 func (issue *Issue) print(force bool, prefix string) {
 	if (issue.Level < issue.store.logLevel) && !force {
 		return

main.go

@@ -49,6 +49,12 @@ Options:
 	// fmt.Println(arguments)
 
 	var options map[string]interface{}
+
+	// Check for NO_COLOR environment variable and turn off colourization if
+	// it is set.
+	// See https://no-color.org/
+	color.NoColor = os.Getenv("NO_COLOR") != ""
+
 	if arguments["--conf"] != nil {
 		// Config file specified
 		options = parseConfFile(arguments, arguments["--conf"].(string), true)
@@ -65,7 +71,6 @@ Options:
 
 	exitCode := run(options)
 	os.Exit(exitCode)
-
 }
 
 type optsMap map[string]interface{}