binding: support parse URL parameters into struct fields

[xmh19936688]

support args in url like '/path/:ID ' can be bind into struct

[unknwon]

Thanks for the PR!

Unfortunately, I do not think it fits the use cases of this package, which is used for form/content binding.

[xmh19936688]

How about make the funcs variable? Then developers can customize them as macaron.ReturnHandler.
Like this:

+type BindHandler func(formStruct interface{}, ifacePtr ...interface{}) macaron.Handler

+var (
+	FormBindHandler          BindHandler = Form
+	MultipartFormBindHandler BindHandler = MultipartForm
+	JsonBindHandler          BindHandler = Json
+)

func bind(ctx *macaron.Context, obj interface{}, ifacePtr ...interface{}) {
	contentType := ctx.Req.Header.Get("Content-Type")
	if ctx.Req.Method == "POST" || ctx.Req.Method == "PUT" || ctx.Req.Method == "PATCH" || ctx.Req.Method == "DELETE" {
		switch {
		case strings.Contains(contentType, "form-urlencoded"):
-			ctx.Invoke(Form(obj, ifacePtr...))
+			ctx.Invoke(FormBindHandler(obj, ifacePtr...))
		case strings.Contains(contentType, "multipart/form-data"):
-			ctx.Invoke(MultipartForm(obj, ifacePtr...))
+			ctx.Invoke(MultipartFormBindHandler(obj, ifacePtr...))
		case strings.Contains(contentType, "json"):
-			ctx.Invoke(Json(obj, ifacePtr...))
+			ctx.Invoke(JsonBindHandler(obj, ifacePtr...))
		default:
			var errors Errors
			if contentType == "" {
				errors.Add([]string{}, ERR_CONTENT_TYPE, "Empty Content-Type")
			} else {
				errors.Add([]string{}, ERR_CONTENT_TYPE, "Unsupported Content-Type")
			}
			ctx.Map(errors)
			ctx.Map(obj) // Map a fake struct so handler won't panic.
		}
	} else {
-		ctx.Invoke(Form(obj, ifacePtr...))
+		ctx.Invoke(FormBindHandler(obj, ifacePtr...))
	}
}

[unknwon]

Hmm, thanks for the brainstorming! I'm very cautious to add global variables recently.

What about adding another top level function binding.URL(...), which specifically binds URL parameters to a struct? Which seems minimum work for both this package and users.

[unknwon]

Thanks for the update, one last issue commented :)