Add Tree Selector

main.go

@@ -96,6 +96,11 @@ func (h *handler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
 		return
 	}
 
+	if r.Method == http.MethodGet && r.URL.Query().Has("tree") {
+		h.handleTree(w, r, urlPath, fsPath)
+		return
+	}
+
 	info, err := os.Stat(fsPath)
 	if err != nil {
 		if os.IsNotExist(err) {