move routes in seperate files; better error handling for enpoint functions

internal/routes/Index.go

@@ -0,0 +1,42 @@
+package routes
+
+import (
+	"crowsnest/internal/data"
+	"crowsnest/internal/model"
+	"crowsnest/internal/viewmodel"
+	"html/template"
+	"net/http"
+)
+
+// sort criteria
+type articleDateOrder struct {}
+func (ord articleDateOrder) Weight(a *model.Article) int {
+    return int(a.PublishDate.Unix())
+}
+
+// List the latest articles using the base template. 
+func Index(w http.ResponseWriter, req *http.Request) {
+    // retrieve from repo
+    fds, err := data.NewFileDatastore("./persistence/spiegel100.json")
+    if err != nil { http.Error(w, "Failed to load datastore", http.StatusInternalServerError); return; }
+    repo, err := data.NewDefaultRepository[*model.Article](fds, "article")
+    if err != nil { http.Error(w, "Failed to create repository", http.StatusInternalServerError); return; }
+    articles, err := repo.GetByCriteria(articleDateOrder{})
+    if err != nil { http.Error(w, "Failed to get articles", http.StatusInternalServerError); return; }
+
+    // truncate
+    if len(articles) > 10 {
+        articles = articles[:10]
+    }
+
+    // convert to viewmodel
+    articleVMs := make([]*viewmodel.ArticleViewModel, 0, len(articles))
+    for _, a := range articles {
+        articleVMs = append(articleVMs, viewmodel.NewArticleViewModel(a))
+    }
+
+    // render template
+    t := template.Must(template.ParseFiles("templates/article.html", "templates/layout.html"))
+    err = t.ExecuteTemplate(w, "base", articleVMs)
+    if err != nil { http.Error(w, "Failed to render template", http.StatusInternalServerError); return; }
+}