Replaced 'panic' with an error return, and a call to 'printAndExit'

color.go

@@ -49,10 +49,11 @@ func newColor(colorString string) (color, error) {
 	return clr, nil
 }
 
-// newColorMust is similar to newColor, but panics if the given color isn't valid.
+// newColorMust is similar to newColor, but prints an error and exits if the given color isn't valid.
 func newColorMust(colorString string) color {
 	if clr, err := newColor(colorString); err != nil {
-		panic(err)
+		printAndExit(err.Error())
+		panic(err) // NEVER REACHED
 	} else {
 		return clr
 	}