print debug messages

irc_bot.go

@@ -3,8 +3,10 @@ package main
 import (
 	"bufio"
 	"crypto/tls"
+	"flag"
 	"fmt"
 	"io"
+	"os"
 	"os/exec"
 	"strings"
 
@@ -37,6 +39,10 @@ func sendMultiline(conn io.Writer, msg string, receiver string) {
 }
 
 func main() {
+	// flags parse
+	var debug bool
+	flag.BoolVar(&debug, "D", false, "Print debug messages.")
+	flag.Parse()
 	// IRC init
 	conn, err := tls.Dial("tcp", host, &tls.Config{RootCAs: nil})
 	if err != nil {
@@ -55,6 +61,9 @@ func main() {
 	for {
 		in, _ := reader.ReadString('\n')
 		words := strings.Fields(in)
+		if debug {
+			fmt.Fprintln(os.Stderr, words)
+		}
 		who := strings.Split(words[0], "!")[0][1:]
 		if who == "botik" {
 			continue