server: Save date of parsed meals

server/server.go

@@ -22,6 +22,7 @@ type (
 		Day   int    `json:"day"`
 		Mensa string `json:"mensa"`
 		Meals []Meal `json:"meals"`
+		Date  string `json:"date"`
 	}
 )
 
@@ -73,12 +74,22 @@ func writeToFile(content []byte) error {
 }
 
 func operate(mensa string, day int) (Menu, error) {
-	meals, err := parseHTML(fmt.Sprintf("http://www.studentenwerk-goettingen.de/speiseplan.html?no_cache=1&day=%vpush=0&selectmensa=%s", day, mensa))
+	document, err := goquery.NewDocument(fmt.Sprintf("http://www.studentenwerk-goettingen.de/speiseplan.html?no_cache=1&day=%vpush=0&selectmensa=%s", day, mensa))
 	if err != nil {
 		return Menu{}, err
 	}
 
-	return Menu{Day: day, Mensa: mensa, Meals: meals}, nil
+	meals, err := parseMeals(document)
+	if err != nil {
+		return Menu{}, err
+	}
+
+	date := parseDate(document)
+	return Menu{Day: day, Mensa: mensa, Meals: meals, Date: date}, nil
+}
+
+func parseDate(doc *goquery.Document) string {
+	return strip(doc.Find("#speise-head2_datum").Text())
 }
 
 func strip(old string) string {
@@ -87,12 +98,7 @@ func strip(old string) string {
 	return new
 }
 
-func parseHTML(url string) ([]Meal, error) {
-	doc, err := goquery.NewDocument(url)
-	if err != nil {
-		return nil, err
-	}
-
+func parseMeals(doc *goquery.Document) ([]Meal, error) {
 	meals := []Meal{}
 	doc.Find("table.speise-tblmain tbody tr").Each(func(i int, s *goquery.Selection) {
 		meal := Meal{