Use environment variable instaed of cli parameters

bot.go

@@ -2,13 +2,14 @@ package main
 
 import (
 	"fmt"
-	"github.com/bwmarrin/discordgo"
-	"github.com/kiliankoe/openmensa"
 	"os"
 	"os/signal"
 	"strings"
 	"syscall"
 	"time"
+
+	"github.com/bwmarrin/discordgo"
+	"github.com/kiliankoe/openmensa"
 )
 
 var (
@@ -28,11 +29,12 @@ var (
 )
 
 func main() {
-	if len(os.Args) <= 0 {
+	token := os.Getenv("MENSABOT_TOKEN")
+	if len(token) == 0 {
 		println("Please add token as cli argument.")
 		return
 	}
-	dg, err := discordgo.New(fmt.Sprintf("Bot %s", os.Args[1]))
+	dg, err := discordgo.New(fmt.Sprintf("Bot %s", token))
 	canteens, err := openmensa.GetCanteens(175)
 	if err != nil {
 		fmt.Println("error creating discord bot: ", err)
@@ -90,11 +92,12 @@ func sendMealsForDate(s *discordgo.Session, t time.Time, channel string) {
 	for i, meal := range meals {
 		prefix := ""
 
-		outer: for emoji, keywords := range emojis {
+	outer:
+		for emoji, keywords := range emojis {
 			for _, keyword := range keywords {
 				if strings.Contains(strings.ToLower(meal.Name), keyword) {
 					prefix += emoji
-					continue outer;
+					continue outer
 				}
 			}
 		}