Do some better error handling in template rendering

internal/templ/templ.go

@@ -3,16 +3,26 @@ package templ
 import (
 	"html/template"
 	"net/http"
+	"os"
 	"path/filepath"
 
 	"gitea.gwairfelin.com/max/gonotes/internal/conf"
 )
 
+type Ctx map[string]any
+
 func RenderTemplate(w http.ResponseWriter, tmpl string, context any) error {
 	files := []string{
 		filepath.Join(conf.Conf.TemplatesDir, conf.Conf.BaseTemplate),
 		filepath.Join(conf.Conf.TemplatesDir, tmpl),
 	}
+
+	for _, f := range files {
+		_, err := os.Stat(f)
+		if err != nil {
+			return err
+		}
+	}
 	t, err := template.ParseFiles(files...)
 	t.ExecuteTemplate(w, "base", context)
 	return err