Une semaine pour coder par soi même : Jour 3

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package main

import (
	"bufio"
	"fmt"
	"net"
	"os"
	"io"
	"strings"
	"time"
    )

var server string = "localhost"
var port string = "6667"
var channel string = "#lms"
var nick string = "bab"
var commander string = ":Lord!Lord@geeknode.fuckyeah"
var onchan bool
var rouge string = "\033[1;31m"
var vert string = "\033[1;32m"
var jaune string = "\033[1;33m"
var cyan string = "\033[1;36m"
var normal string = "\033[0m"
var me string
var ircconn net.Conn
var debug bool


func main() {

	if len(os.Args) > 1 {
		server = os.Args[1]
	}
	ircconn = initIrc(server, port, nick, channel)

	go incoming()
	ircconnbuf := bufio.NewReader(ircconn)
	go io.Copy(ircconn, os.Stdin)

	for {
		msg, err := ircconnbuf.ReadString('\n')
		if err != nil {
    			fmt.Println(err)
			break
		}
		fmt.Print(jaune+"<< "+msg+normal)
		parseIrc(msg)
	}
	
	defer ircconn.Close()
}

// ------------------
// Côté IRC
// ------------------

func initIrc(server string, port string, nick string, channel string) net.Conn{
	conn, err := net.Dial("tcp",server+":"+port)
	fmt.Println(rouge+server+":"+port+normal)
	if err != nil {
		fmt.Println(err)
		os.Exit(1)
	}
	fmt.Println(rouge+">> NICK "+nick+normal)
	io.WriteString(conn,"NICK "+nick+"\n")
	fmt.Println(rouge+">> USER "+nick+" 0.0.0.0 "+nick+" :"+nick+" bot"+normal)
	io.WriteString(conn,"USER "+nick+" 0.0.0.0 "+nick+" :"+nick+" bot\n")
	fmt.Println(rouge+">> JOIN "+channel+normal)
	io.WriteString(conn,"JOIN "+channel+"\n")
	return conn
}

func parseIrc(msg string){
	var elements []string = strings.Fields(msg)
	for i, element := range elements {
		fmt.Print(cyan+"[",i,"|"+normal+element+cyan+"] "+normal )
	}
	fmt.Println("")

		if elements[1] == "421" {
			fmt.Println("!! Commande non reconnue par le serveur !!")
		}

		if elements[1] == "433" {
			nick = nick+"_"
			io.WriteString(ircconn,"NICK "+nick+"\n")
		}
		
		if elements[0] == "PING" {
			fmt.Print(rouge+">> PONG "+strings.TrimPrefix(msg, "PING :")+normal)
			io.WriteString(ircconn,"PONG "+strings.TrimPrefix(msg, "PING :")+"\n")
		}

		if elements[1] == "JOIN" {
    			if ":"+nick == stringCut(elements[0],"!"){
        			me = strings.TrimPrefix(elements[0],":")
				fmt.Println(me+" a rejoin le salon "+strings.Trim(elements[2],":"))
				onchan = true
				sendIrc("c'est moi que vla!")

    			}
		}

		if elements[1] == "PART" {
			fmt.Println("On est parti de "+strings.Trim(elements[2],":"))
			onchan = false
		}

		if elements[1] == "KICK" && elements[3] == nick {
			fmt.Println("Ptain on s'est fait kicker de "+elements[2]+" par "+elements[4]+" !")
			io.WriteString(ircconn,"JOIN "+channel+"\n")
		}

		if elements[1] == ":Closing" && elements[2] == "Link:" {
			// Déconnecté
			ircconn = initIrc(server, port, nick, channel)
		}
}

func sendIrc(msg string){
	msg = strings.TrimSpace(msg)
	fmt.Print(rouge+">> PRIVMSG "+channel+" :"+msg+"\n"+normal)
	io.WriteString(ircconn,"PRIVMSG "+channel+" :"+msg+"\n")

}

// ------------------
// Serveur en écoute
// ------------------

func incoming(){
	in, err :=net.Listen("tcp",":4321")
	defer in.Close()
	if err != nil {
		fmt.Println(err)
		os.Exit(1)
	}

	for {
		inconn, err :=in.Accept()
		if err != nil {
			fmt.Println(err)
			continue
		}
		go handleIncoming(inconn)
	}
}

func handleIncoming(in net.Conn){
	fmt.Println(vert+"Incoming from ",in.RemoteAddr(),normal)
	inbuf := bufio.NewReader(in)
	for {
    		inmsg, err := inbuf.ReadString('\n')
    		if err != nil || !onchan || inmsg == "\n" {
			break
    		}
    		fmt.Print(vert+"<<]] "+inmsg+normal)
    		sendIrc(inmsg)
		time.Sleep(500 * time.Millisecond)
	}
}

// ------------
//  Génériques
// ------------

func stringCut(incoming string, pattern string) string{
	var results = strings.Split(incoming, pattern)
	if len(results) < 1 {
		return incoming
	} else {
		return results[0]
	}
}