REFACTOR: add 'toast' helper response handler to produce toasts

internal/webserver/middlewares.go

@@ -34,7 +34,7 @@ func (app *Application) recoverPanic(next http.Handler) http.Handler {
 		defer func() {
 			if err := recover(); err != nil {
 				w.Header().Set("Connection", "close")
-				app.error_500(w, fmt.Errorf("%s", err))
+				app.error_500(w, r, fmt.Errorf("%s", err))
 			}
 		}()
 		next.ServeHTTP(w, r)

internal/webserver/response_helpers.go

@@ -28,24 +28,27 @@ func (app *Application) error_404(w http.ResponseWriter) {
 	http.Error(w, "Not Found", 404)
 }
 
-func (app *Application) error_500(w http.ResponseWriter, err error) {
+func (app *Application) error_500(w http.ResponseWriter, r *http.Request, err error) {
 	trace := fmt.Sprintf("%s\n%s", err.Error(), debug.Stack())
 	err2 := app.ErrorLog.Output(2, trace) // Magic
 	if err2 != nil {
 		panic(err2)
 	}
+	app.toast(w, r, Toast{Title: "Server error", Message: err.Error(), Type: "error"})
+}
 
+func (app *Application) toast(w http.ResponseWriter, r *http.Request, t Toast) {
 	// Reset the HTMX response to return an error toast and put it in the
 	w.Header().Set("HX-Reswap", "beforeend")
-	w.Header().Set("HX-Retarget", "#errorMessages")
+	w.Header().Set("HX-Retarget", "#toasts")
 	w.Header().Set("HX-Push-Url", "false")
 
-	r := renderer{
-		Filenames: []string{get_filepath("tpl/http_500.tpl")},
-		TplName:   "error-toast",
-		Data: struct {
-			ErrorMsg string
-		}{err.Error()},
-	}
-	r.BufferedRender(w)
+	app.buffered_render_htmx(w, "toast", PageGlobalData{}, t)
+}
+
+type Toast struct {
+	Title          string
+	Message        string
+	Type           string
+	AutoCloseDelay int64
 }

internal/webserver/static/styles.css

@@ -293,7 +293,31 @@ main {
 /**
  * Toast notification popup that gets sent on HTTP 500
  */
-.error-messages {
+.toast {
+	border-radius: 1em;
+	padding: 1em;
+	text-align: center;
+	word-wrap: break-word;
+	margin: 1em;
+	width: 90%;
+
+	/* Default: use "success" toast */
+	background-color: #efe;
+	border: 1px solid green;
+	color: green;
+
+	&.toast--error {
+		color: red;
+		background-color: #fee;
+		border-color: red;
+	}
+	&.toast--warning {
+		color: hsl(50.59deg 75% 40%);
+		background-color: #ffe;
+		border-color: hsl(50.59deg 75% 40%);
+	}
+}
+.toasts {
 	position: fixed;
 	left: var(--width-body-margins);
 	top: 10em;
@@ -301,18 +325,6 @@ main {
 	display: flex;
 	flex-direction: column;
 	align-items: center;
-
-	.error-messages__msg {
-		background-color: #fee;
-		border: 1px solid red;
-		border-radius: 1em;
-		padding: 1em;
-		color: red;
-		text-align: center;
-		word-wrap: break-word;
-		margin: 1em;
-		width: 90%;
-	}
 }
 
 /**
@@ -440,10 +452,12 @@ main {
  */
 .text {
 	display: block;
-	margin-bottom: 0.4em;
+	margin-bottom: 0.5em;
 	margin-top: 0;
 	overflow-wrap: anywhere;
 	cursor: text;
+	/* Prevent empty paragraphs from being collapsed into each other (i.e., `margin-bottom`s overlapping) */
+	padding-bottom: 0.1em;
 
 	&:last-child {
 		margin-bottom: 0;

internal/webserver/tpl/http_500.tpl

@@ -1,6 +0,0 @@
-{{define "error-toast"}}
-  <div class="error-messages__msg" open>
-    <span>{{.ErrorMsg}}</span>
-    <button class="suicide" onclick="htmx.remove('.error-messages__msg')">X</button>
-  </div>
-{{end}}

internal/webserver/tpl/includes/base.tpl

@@ -43,7 +43,7 @@
         <a class="button image-carousel__close-button" onclick="image_carousel.close()">X</a>
         <img class="image-carousel__active-image" src="">
       </dialog>
-      <div class="error-messages" id="errorMessages">
+      <div class="toasts" id="toasts">
       </div>
     </body>
   </html>

internal/webserver/tpl/includes/toast.tpl

@@ -0,0 +1,13 @@
+{{define "toast"}}
+  <div
+    class="toast toast--{{.Type}}"
+    {{if .AutoCloseDelay}}
+      hx-on::load="setTimeout(() => this.remove(), {{.AutoCloseDelay}} + 2000); setTimeout(() => this.classList.add('disappearing'), {{.AutoCloseDelay}})"
+    {{end}}
+  >
+    <span class="toast__message">{{.Message}}</span>
+    {{if not .AutoCloseDelay}}
+      <button class="suicide" onclick="this.parentElement.remove()">X</button>
+    {{end}}
+  </div>
+{{end}}