Support listing notes by tag

internal/notes/notes.go

@@ -398,3 +398,12 @@ func (n *Note) ToggleBox(nthBox int) {
 	n.Body = buf.Bytes()
 	n.Save()
 }
+
+func (n *Note) HasTag(tag string) bool {
+	for _, tag_ := range n.Tags {
+		if tag_ == tag {
+			return true
+		}
+	}
+	return false
+}

internal/notes/views/views.go

@@ -199,6 +199,8 @@ type titleAndURL struct {
 func list(w http.ResponseWriter, r *http.Request) {
 	user := r.Context().Value(middleware.ContextKey("user")).(string)
 
+	tag := r.FormValue("tag")
+
 	titlesAndUrls := make([]titleAndURL, 0)
 
 	ns := notes.Notes.Get(user)
@@ -206,10 +208,12 @@ func list(w http.ResponseWriter, r *http.Request) {
 	log.Printf("Notes for %s: %+v", user, ns)
 
 	for note := range ns {
-		titlesAndUrls = append(
-			titlesAndUrls,
-			titleAndURL{Title: note.Title, URL: myurls.Reverse("view", urls.Repl{"note": note.Uid})},
-		)
+		if tag == "" || note.HasTag(tag) {
+			titlesAndUrls = append(
+				titlesAndUrls,
+				titleAndURL{Title: note.Title, URL: myurls.Reverse("view", urls.Repl{"note": note.Uid})},
+			)
+		}
 	}
 
 	urlNew := myurls.Reverse("new", urls.Repl{})