add some routes

routes/helper.go

@@ -0,0 +1,22 @@
+package routes
+
+import (
+	"runtime"
+	"strings"
+)
+
+func PathOf() string {
+	_, file, _, _ := runtime.Caller(1)
+
+	// 取 routes/ 之後的部分
+	idx := strings.Index(file, "routes/")
+	if idx == -1 {
+		return "/"
+	}
+	path := file[idx+len("routes"):]
+
+	// 去掉 .go
+	path = strings.TrimSuffix(path, ".go")
+
+	return path
+}