rework template rendering, cache parsed templates

adapt error wrapping principle

main.go

@@ -11,6 +11,7 @@ import (
 	"officeHours/controllers"
 	"officeHours/repositories"
 	"officeHours/sqldb"
+	"officeHours/templating"
 	"os"
 )
 
@@ -20,10 +21,6 @@ func main() {
 		log.SetOutput(logwriter)
 	}
 
-	if controllers.TemplateError != nil {
-		log.Fatalf("Error parsing templates: %s", controllers.TemplateError.Error())
-	}
-
 	configFile := flag.String(
 		"config",
 		"config/config.json",
@@ -42,10 +39,16 @@ func main() {
 
 	// serve static files
 	staticHandler := http.FileServer(http.Dir("./static"))
-
+	// parse templates
+	if err = templating.InitTemplates(); err != nil {
+		log.Print(err.Error())
+		log.Fatal(">>>\nFatal error occurred, aborting program\n<<<\n")
+	}
+	// database connection
 	db, err := sqldb.Connect(conf)
 	if err != nil {
-		log.Fatalf(err.Error())
+		log.Print(err.Error())
+		log.Fatal(">>>\nFatal error occurred, aborting program\n<<<\n")
 	}
 	// Create repos
 	roomRepo := repositories.NewRoomRepo(db)