fix: adjust validaOptions to handle preconfigured width

fixes #666

main.go

@@ -156,6 +156,7 @@ func validateStyle(style string) error {
 
 func validateOptions(cmd *cobra.Command) error {
 	// grab config values from Viper
+	width_in_config := viper.InConfig("width")
 	width = viper.GetUint("width")
 	mouse = viper.GetBool("mouse")
 	pager = viper.GetBool("pager")
@@ -177,18 +178,24 @@ func validateOptions(cmd *cobra.Command) error {
 
 	// Detect terminal width
 	if !cmd.Flags().Changed("width") {
-		if isTerminal && width == 0 {
-			w, _, err := term.GetSize(int(os.Stdout.Fd()))
+		w := -1
+		if isTerminal {
+			var err error
+			w, _, err = term.GetSize(int(os.Stdout.Fd()))
 			if err == nil {
-				width = uint(w)
-			}
-
-			if width > 120 {
-				width = 120
+				if w > 120 {
+					w = 120
+				}
+			} else {
+				w = -1
 			}
 		}
-		if width == 0 {
-			width = 80
+		if w == -1 {
+			if !width_in_config {
+				width = 80
+			}
+		} else {
+			width = uint(w)
 		}
 	}
 	return nil