Add vendor matterbridge/gozulipbot

vendor/github.com/matterbridge/gozulipbot/flag.go

@@ -0,0 +1,32 @@
+package gozulipbot
+
+import (
+	"flag"
+	"fmt"
+	"time"
+)
+
+func (b *Bot) GetConfigFromFlags() error {
+	var (
+		apiKey  = flag.String("apikey", "", "bot api key")
+		apiURL  = flag.String("apiurl", "", "url of zulip server")
+		email   = flag.String("email", "", "bot email address")
+		backoff = flag.Duration("backoff", 1*time.Second, "backoff base duration")
+	)
+	flag.Parse()
+
+	if *apiKey == "" {
+		return fmt.Errorf("--apikey is required")
+	}
+	if *apiURL == "" {
+		return fmt.Errorf("--apiurl is required")
+	}
+	if *email == "" {
+		return fmt.Errorf("--email is required")
+	}
+	b.APIKey = *apiKey
+	b.APIURL = *apiURL
+	b.Email = *email
+	b.Backoff = *backoff
+	return nil
+}