Manual code review by an actual human.

internal/engine/engine.go

@@ -220,13 +220,12 @@ func (e *ContentEngine) hasInsertrAddClass(node *html.Node) bool {
 }
 
 // addContentAttributes adds data-content-id attribute only
-// HTML-first approach: no content-type attribute needed
 func (e *ContentEngine) addContentAttributes(node *html.Node, contentID string) {
 	// Add data-content-id attribute
 	e.setAttribute(node, "data-content-id", contentID)
 }
 
-// setAttribute sets an attribute on an HTML node
+// setAttribute sets an attribute on a HTML node
 func (e *ContentEngine) setAttribute(node *html.Node, key, value string) {
 	// Remove existing attribute if it exists
 	for i, attr := range node.Attr {
@@ -262,10 +261,8 @@ func (e *ContentEngine) addClass(node *html.Node, className string) {
 	}
 
 	// Check if class already exists
-	for _, class := range classes {
-		if class == className {
-			return // Class already exists
-		}
+	if slices.Contains(classes, className) {
+		return
 	}
 
 	// Add new class
@@ -314,7 +311,7 @@ func (e *ContentEngine) removeClass(node *html.Node, className string) {
 	// Update or remove class attribute
 	if len(newClasses) == 0 {
 		// Remove class attribute entirely if no classes remain
-		node.Attr = append(node.Attr[:classIndex], node.Attr[classIndex+1:]...)
+		node.Attr = slices.Delete(node.Attr, classIndex, classIndex+1)
 	} else {
 		// Update class attribute with remaining classes
 		node.Attr[classIndex].Val = strings.Join(newClasses, " ")
@@ -338,6 +335,7 @@ func (e *ContentEngine) injectContent(elements []ProcessedElement, siteID string
 			elem.Content = contentItem.HTMLContent
 
 			// Update injector siteID for this operation
+			// HACK: I do not like this. Injector refactor?
 			e.injector.siteID = siteID
 			e.injector.injectHTMLContent(elem.Node, contentItem.HTMLContent)
 		}
@@ -360,6 +358,7 @@ func (e *ContentEngine) extractHTMLContent(node *html.Node) string {
 }
 
 // extractOriginalTemplate extracts the outer HTML of the element (including the element itself)
+// HACK: Rename
 func (e *ContentEngine) extractOriginalTemplate(node *html.Node) string {
 	var buf strings.Builder
 	if err := html.Render(&buf, node); err != nil {
@@ -418,10 +417,8 @@ func (e *ContentEngine) hasClass(n *html.Node, className string) bool {
 	for _, attr := range n.Attr {
 		if attr.Key == "class" {
 			classes := strings.Fields(attr.Val)
-			for _, class := range classes {
-				if class == className {
-					return true
-				}
+			if slices.Contains(classes, className) {
+				return true
 			}
 		}
 	}