Added limit flag

Fixes #3

main.go

@@ -13,14 +13,18 @@ import (
 
 var (
 	isIstioProxyLogs bool
+	limit            int
 )
 
 func init() {
 	flag.BoolVar(&isIstioProxyLogs, "use-istio", false, "Enable to use istio-proxy format")
+	flag.IntVar(&limit, "limit", 0, "Limit number of lines parsed. Set to 0 for unlimited scroll")
 }
 
 func main() {
 	var p *parser.Parser
+	var enableLimits bool
+
 	flag.Parse()
 
 	log.Printf("Reading input from STDIN. Use the pipe \"|\" operator to redirect traffic to engarde")
@@ -30,6 +34,10 @@ func main() {
 		p = parser.New(parser.EnvoyAccessLogsPattern)
 	}
 
+	if limit > 0 {
+		enableLimits = true
+	}
+
 	scanner := bufio.NewScanner(os.Stdin)
 	for scanner.Scan() {
 		line := scanner.Text()
@@ -43,5 +51,12 @@ func main() {
 			accessLog.ParseError = err.Error()
 		}
 		fmt.Fprintf(os.Stdout, string(bAccessLog))
+
+		if enableLimits {
+			limit = limit - 1
+			if limit == 0 {
+				os.Exit(0)
+			}
+		}
 	}
 }