Subject rendering

This isn't the best solution and might not even be worth doing as the subject template doesn't do anything and means i have to call the API in multiple paces

main.go

@@ -129,7 +129,35 @@ func main() {
 			Body:    email_content,
 			Subject: "This is a test subject", // TODO(jack): Get from user input on page
 		}
-		w.Write([]byte(renderPostmarkTemplate(apiConfig.Postmark, postmarkTemplate, model)))
+
+		renderedEmail := renderPostmarkTemplate(apiConfig.Postmark, postmarkTemplate, model)
+		w.Write([]byte(renderedEmail.Html))
+	})
+
+	mux.HandleFunc("/subject_preview", func(w http.ResponseWriter, r *http.Request) {
+		log.Printf("Hello '%v %v' handler", r.Method, r.URL)
+		body, err := io.ReadAll(r.Body)
+		if err != nil {
+			http.Error(w, err.Error(), http.StatusInternalServerError)
+			return
+		}
+		defer r.Body.Close()
+
+		text_field_body := string(body)
+		text_field_body, _ = strings.CutPrefix(text_field_body, "subject=")
+		decoded_subject, err := url.QueryUnescape(text_field_body)
+		if err != nil {
+			panic(err)
+		}
+
+		model := PostmarkTemplateModel{
+			Name:    apiConfig.Default.SenderName,
+			Email:   apiConfig.Postmark.SenderEmail,
+			Body:    "",
+			Subject: decoded_subject, // TODO(jack): Get from user input on page
+		}
+		renderedEmail := renderPostmarkTemplate(apiConfig.Postmark, postmarkTemplate, model)
+		w.Write([]byte(renderedEmail.Subject))
 	})
 
 	// Endpoint called on load or button press by htmx to retrieve and populate the mailing list

postmark.go

@@ -64,6 +64,11 @@ type ValidationResponse struct {
 	SuggestedTemplateModel interface{}
 }
 
+type Email struct {
+	Html    string
+	Subject string
+}
+
 // Gets the tempalte in the postmark config section of the app.ini file from teh postmark server so we can render it
 func getPostmarkTemplate(cfg PostmarkConfig) PostmarkTemplate {
 	// Get Template
@@ -92,7 +97,7 @@ func getPostmarkTemplate(cfg PostmarkConfig) PostmarkTemplate {
 }
 
 // Given a tempalte and model use the postmark tempalte validation api to render the template
-func renderPostmarkTemplate(cfg PostmarkConfig, template PostmarkTemplate, model PostmarkTemplateModel) string {
+func renderPostmarkTemplate(cfg PostmarkConfig, template PostmarkTemplate, model PostmarkTemplateModel) Email {
 	bodyObj := ValidateTemplateBody{
 		Subject:         template.Subject,
 		HTMLBody:        template.HtmlBody,
@@ -131,5 +136,8 @@ func renderPostmarkTemplate(cfg PostmarkConfig, template PostmarkTemplate, model
 		panic(decode_error)
 	}
 
-	return response.HtmlBody.RenderedContent
+	return Email{
+		Html:    response.HtmlBody.RenderedContent,
+		Subject: response.Subject.RenderedContent,
+	}
 }

templates/index.html

@@ -22,7 +22,8 @@
                 <div class="column">
                     <div style="display: flex; justify-content: space-between;">
                         <span class="input_label">Subject:</span>
-                        <input name="subject" type="text" id="subject">
+                        <input name="subject" type="text" id="subject" hx-post="/subject_preview"
+                            hx-trigger="keyup changed delay:1000ms" hx-target="#subject-preview">
                     </div><br>
                     <textarea name="email_input" id="typebox" rows="32" cols="64" style="resize: none;"
                         hx-trigger="keyup changed delay:1000ms" hx-post="/mail-content" hx-target="#email-preview"
@@ -30,7 +31,7 @@
                 </div>
 
                 <div class="column">
-                    <div id="subject-preview">Subject preview here</div><br>
+                    <div id="subject-preview">&nbsp;</div><br>
                     <div id="email-preview"></div>
                 </div>
             </div>