todogo/main.go

package main

import (
	"embed"
	"html/template"
	"io"
	"log"
	"net/http"
)

//go:embed views/*.html
var tmplFS embed.FS

//go:embed public/*
var publicFS embed.FS

type Template struct {
	templates *template.Template
}

func New() *Template {
	templates := template.Must(template.New("").ParseFS(tmplFS, "views/*.html"))

	return &Template{
		templates: templates,
	}
}

func (t *Template) Render(w io.Writer, name string, data any) error {
	tmpl := template.Must(t.templates.Clone())
	tmpl = template.Must(tmpl.ParseFS(tmplFS, "views/"+name))
	return tmpl.ExecuteTemplate(w, "layout.html", data)
}

type Todo struct {
	Id        string
	Title     string
	Completed bool
}

type ViewModel struct {
	Todos []Todo
}

func main() {
	todos := make([]Todo, 0, 10)

	t := New()
	http.Handle("/public/", http.FileServer(http.FS(publicFS)))
	http.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
		vm := ViewModel{
			Todos: todos,
		}
		err := t.Render(w, "list.html", vm)
		if err != nil {
			log.Println(err)
		}
	})
	http.HandleFunc("/todo", func(w http.ResponseWriter, r *http.Request) {
		if r.Method != "POST" {
			w.WriteHeader(http.StatusMethodNotAllowed)
			return
		}

		if err := r.ParseForm(); err != nil {
			w.WriteHeader(http.StatusBadRequest)
			return
		}

		title := r.Form.Get("title")
		todos = append(todos, Todo{
			Title: title,
		})

		w.Header().Set("Location", "/")
		w.WriteHeader(http.StatusSeeOther)
	})
	log.Print("Running on 8080")
	log.Fatal(http.ListenAndServe(":8080", nil))
}