Let users define a prefix & suffix for style elements

baselement.go

@@ -31,6 +31,14 @@ func (e *BaseElement) Render(w io.Writer, node *bf.Node, tr *TermRenderer) error
 		fmt.Fprintf(w, "%s", e.Token)
 		return nil
 	}
+	if rules.Prefix != "" {
+		fmt.Fprintf(w, "%s", rules.Prefix)
+	}
+	defer func() {
+		if rules.Suffix != "" {
+			fmt.Fprintf(w, "%s", rules.Suffix)
+		}
+	}()
 
 	out := aurora.Reset(e.Token)
 	if rules.Color != "" {

style.go

@@ -47,6 +47,8 @@ type ElementStyle struct {
 	Inverse         bool   `json:"inverse"`
 	Blink           bool   `json:"blink"`
 	Theme           string `json:"theme"`
+	Prefix          string `json:"prefix"`
+	Suffix          string `json:"suffix"`
 }
 
 func keyToType(key string) (StyleType, error) {