counts

main.go

@@ -41,8 +41,9 @@ type Todo struct {
 }
 
 type ViewModel struct {
-	Todos []Todo
+	Todos      []Todo
-	Only  string
+	Only       string
+	Incomplete int
 }
 
 func filterSlice[T any](xs []T, pred func(T) bool) []T {
@@ -57,6 +58,17 @@ func filterSlice[T any](xs []T, pred func(T) bool) []T {
 	return result
 }
 
+func countSlice[T any](xs []T, pred func(T) bool) int {
+	count := 0
+	for _, element := range xs {
+		if pred(element) {
+			count += 1
+		}
+	}
+
+	return count
+}
+
 func main() {
 	todos := make([]Todo, 0, 10)
 
@@ -75,9 +87,12 @@ func main() {
 			renderTodos = filterSlice(todos, func(todo Todo) bool { return todo.Completed })
 		}
 
+		incomplete := countSlice(todos, func(todo Todo) bool { return !todo.Completed })
+
 		vm := ViewModel{
-			Todos: renderTodos,
+			Todos:      renderTodos,
-			Only:  only,
+			Only:       only,
+			Incomplete: incomplete,
 		}
 		err := t.Render(w, "list.html", vm)
 		if err != nil {
@@ -127,6 +142,42 @@ func main() {
 		w.Header().Set("Location", "/")
 		w.WriteHeader(http.StatusSeeOther)
 	})
+
+	http.HandleFunc("/destroy", 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
+		}
+
+		id := r.Form.Get("id")
+		todos = filterSlice(todos, func(t Todo) bool { return t.Id != id })
+
+		w.Header().Set("Location", "/")
+		w.WriteHeader(http.StatusSeeOther)
+	})
+
+	http.HandleFunc("/clear", 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
+		}
+
+		todos = filterSlice(todos, func(t Todo) bool { return !t.Completed })
+
+		w.Header().Set("Location", "/")
+		w.WriteHeader(http.StatusSeeOther)
+	})
+
 	log.Print("Running on 8080")
 	log.Fatal(http.ListenAndServe(":8080", nil))
 }

views/_task.html

@@ -1,12 +1,13 @@
 <li class="{{if .Completed}}completed{{end}}">
   <div class="view">
     <form class="toggle" action="/toggle?id={{.Id}}" method="POST">
-      <button>
+      <button></button>
-        t
-      </button>
     </form>
     <!-- <input class="toggle" type="checkbox" {{if .Completed}}checked{{end}}> -->
     <label>{{.Title}}</label>
-    <button class="destroy"></button>
+
+    <form action="/destroy?id={{.Id}}" method="POST">
+      <button class="destroy"></button>
+    </form>
   </div>
 </li>

views/list.html

@@ -20,7 +20,7 @@
   <!-- This footer should be hidden by default and shown when there are todos -->
   <footer class="footer">
     <!-- This should be `0 items left` by default -->
-    <span class="todo-count"><strong>0</strong> item left</span>
+    <span class="todo-count"><strong>{{.Incomplete}}</strong> items left</span>
     <!-- Remove this if you don't implement routing -->
     <ul class="filters">
       <li>
@@ -34,7 +34,9 @@
       </li>
     </ul>
     <!-- Hidden if no completed items are left ↓ -->
-    <button class="clear-completed">Clear completed</button>
+    <form action="/clear" method="POST">
+      <button class="clear-completed">Clear completed</button>
+    </form>
   </footer>
 </section>
 {{end}}