present errors that occur

cmd/web/handlers.go

@@ -44,6 +44,7 @@ func (app *application) generateRss(w http.ResponseWriter, r *http.Request) {
 
     feed := feedInfo.GenerateRSS()
     data := newTemplateData(r)
+    data.Errors = feedInfo.Errors
     data.Feeds = append(data.Feeds, feed)
     app.renderElem(w, http.StatusOK, "feed-output.tmpl.html", data)
 }

cmd/web/templates.go

@@ -11,6 +11,7 @@ type templateData struct {
     CurrentYear int
     Feeds       []string
     Title       string
+    Errors      map[string]string
 }
 
 func newTemplateCache() (map[string]*template.Template, error) {

feed/feed.go

@@ -36,7 +36,7 @@ type FeedInfo struct {
     SiteDesc    string
     PageUrls    []string
     Items       []*FeedItem
-    errors      map[string]error
+    Errors      map[string]string
 } 
 
 type FeedItem struct {
@@ -99,7 +99,7 @@ func getHtmlElement(doc *html.Node, tag string) (*html.Node, error) {
     }
     f(doc, tag)
     if element == nil {
-        return nil, fmt.Errorf("no <%s> element found", tag)
+        return nil, fmt.Errorf("no &lt;%s&gt; element found", tag)
     }
     return element, nil
 }
@@ -148,7 +148,7 @@ func NewFeedItem(url string) (*FeedItem, error) {
     item := FeedItem{
         Url: url,
     }
-    item.ParseContent(rawhtml);
+    err = item.ParseContent(rawhtml);
     if err != nil {
         return nil, fmt.Errorf("Could not parse feed item: %w", err)
     }
@@ -161,11 +161,12 @@ func NewFeedInfo(name, base_url, desc, author string, page_urls...string) (*Feed
         SiteUrl: base_url,
         SiteDesc: desc,
         PageUrls: page_urls,
+        Errors: make(map[string]string, 10),
     }
     for _,url := range info.PageUrls {
         item, err := NewFeedItem(url)
         if err != nil {
-            info.errors[url] = err
+            info.Errors[url] = err.Error()
         } else {
             info.Items = append(info.Items, item)
         }

ui/html/htmx/feed-output.tmpl.html

@@ -1,5 +1,10 @@
-{{ range .Feeds }}
 <h2>Output</h2>
+{{ range $url, $error := .Errors }}
+<p class="error">
+Error parsing page at {{ $url }}: {{ $error }}
+</p>
+{{end}}
+{{ range .Feeds }}
 <button id="copy" onclick="copyToClipboard()">Copy to Clipboard</button>
 <textarea readonly="true" cols="80" rows="120" id="feed-output">
 {{ . }}

ui/static/css/main.css

@@ -1,7 +1,3 @@
-#output {
-    white-space: pre;
-}
-
 body {
     font-size: 16px;
 }
@@ -19,3 +15,6 @@ input, textarea {
     margin: 0 auto;
 }
 
+.error {
+    color: red;
+}