added option to output QRCode as a file

README.md

@@ -22,6 +22,7 @@ zapconnect
 -i, --localip            Use local ip instead of public ip.
 -l, --localhost          Use 127.0.0.1 for ip.
 -j, --json               Display json instead of a QRCode.
+-o, --image              Output QRCode to file.
     --lnddir=            The base directory that contains lnd's data, logs, configuration
                          file, etc.
     --configfile=        Path to configuration file

config.go

@@ -144,6 +144,7 @@ type zapConnectConfig struct {
 	LocalIp   bool `short:"i" long:"localip" description:"Include local ip in QRCode."`
 	Localhost bool `short:"l" long:"localhost" description:"Use 127.0.0.1 for ip."`
 	Json      bool `short:"j" long:"json" description:"Generate json instead of a QRCode."`
+	Image     bool `short:"o" long:"image" description:"Output QRCode to file."`
 }
 
 // config defines the configuration options for lnd.

zapconnect.go

@@ -10,6 +10,7 @@ import (
 	"os"
 	"encoding/pem"
     "github.com/glendc/go-external-ip"
+	qrcode "github.com/skip2/go-qrcode"
 )
 
 type certificates struct {
@@ -99,6 +100,9 @@ func main() {
 
 	if loadedConfig.ZapConnect.Json {
 		fmt.Println(string(certB))
+	} else if loadedConfig.ZapConnect.Image {
+		qrcode.WriteFile(string(certB), qrcode.Medium, 512, "zapconnect-qr.png")
+		fmt.Println("Outputed QRCode to file \"zapconnect-qr.png\"")
 	} else {
 		obj := qrcodeTerminal.New()
 		obj.Get(string(certB)).Print()