Store latest successfully fetched data in struct

src/statusscreen/SL.go

@@ -13,7 +13,8 @@ import (
 
 // SL is my SL struct
 type SL struct {
-	Config *Config
+	Config       *Config
+	lastResponse SLResponse
 }
 
 // SLResponse is a struct to get the interesting data from API Responses
@@ -54,11 +55,16 @@ func (sl *SL) GetOutput() string {
 
 	sldata, err := sl.getTimeTable()
 
+	// If no error occured, save the latest data to the struct
+	if err == nil {
+		sl.lastResponse = sldata
+	}
+
 	if err != nil {
 		log.Fatal(err)
 	}
 
-	for _, v := range sldata.ResponseData.Metros {
+	for _, v := range sl.lastResponse.ResponseData.Metros {
 		table.Append([]string{
 			v.LineNumber,
 			v.Destination,

statusscreen.go

@@ -11,7 +11,7 @@ import (
 func main() {
 	config := getConfig("status.toml")
 
-	sl := statusscreen.SL{&config}
+	sl := statusscreen.SL{Config: &config}
 
 	fmt.Println(sl.GetOutput())
 }