style: added Highlight function

internal/common/group.go

@@ -26,24 +26,9 @@ func (g Group) Style() string {
 		return style.Default
 	}
 
-	groupStyles := []string{
-		style.Carapace.H1,
-		style.Carapace.H2,
-		style.Carapace.H3,
-		style.Carapace.H4,
-		style.Carapace.H5,
-		style.Carapace.H6,
-		style.Carapace.H7,
-		style.Carapace.H8,
-		style.Carapace.H9,
-		style.Carapace.H10,
-		style.Carapace.H11,
-		style.Carapace.H12,
-	}
-
 	for index, group := range g.Cmd.Parent().Groups() {
-		if group.ID == g.Cmd.GroupID && index < len(groupStyles) {
-			return groupStyles[index]
+		if group.ID == g.Cmd.GroupID {
+			return style.Carapace.Highlight(index)
 		}
 	}
 	return style.Default

pkg/style/config.go

@@ -24,7 +24,7 @@ func Register(name string, i interface{}) { config.RegisterStyle(name, i) }
 //	Set("carapace.Value", "bold magenta")
 func Set(key, value string) error { return config.SetStyle(key, value) }
 
-var Carapace = struct {
+type carapace struct {
 	Value       string `desc:"default style for values"`
 	Description string `desc:"default style for descriptions"`
 	Error       string `desc:"default style for errors"`
@@ -56,7 +56,9 @@ var Carapace = struct {
 
 	H11 string `desc:"Highlight 11"`
 	H12 string `desc:"Highlight 12"`
-}{
+}
+
+var Carapace = carapace{
 	Value:       Default,
 	Description: Gray,
 	Error:       Of(Bold, Red),
@@ -90,6 +92,39 @@ var Carapace = struct {
 	H12: Of(Bold, Dim),
 }
 
+// Highlight returns the style for given level (0..n)
+func (c carapace) Highlight(level int) string {
+	switch level {
+	case 0:
+		return c.H1
+	case 1:
+		return c.H2
+	case 2:
+		return c.H3
+	case 3:
+		return c.H4
+	case 4:
+		return c.H5
+	case 5:
+		return c.H6
+	case 6:
+		return c.H7
+	case 7:
+		return c.H8
+	case 8:
+		return c.H9
+	case 9:
+		return c.H10
+	case 10:
+		return c.H11
+	case 11:
+		return c.H12
+	default:
+		return Default
+	}
+
+}
+
 func init() {
 	Register("carapace", &Carapace)
 }