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path: root/main.go
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package main

import (
	"container/ring"
	"flag"
	"fmt"
	"log"
	"time"

	irc "github.com/fluffle/goirc/client"
)

type bot struct {
	room   string
	conn   *irc.Conn
	notice chan string
	kick   chan string
	last   *ring.Ring
}

func New(name, node, room string, ssl bool) *bot {
	conf := irc.NewConfig(name)
	conf.Server = node
	conf.SSL = ssl
	conn := irc.Client(conf)
	return &bot{
		room:   room,
		conn:   conn,
		notice: notify(conn, room),
		kick:   kicker(conn, room),
		last:   ring.New(10),
	}
}

func (b *bot) push(line *irc.Line) {
	b.last.Value = line
	b.last = b.last.Next()
}

func (b *bot) find(c chan string, nick string) {
	var msg string
	b.last.Do(func(v interface{}) {
		if v != nil {
			l := v.(*irc.Line)
			if l.Nick == nick {
				msg = l.Text()
			}
		}
	})
	if msg != "" {
		c <- msg
	}
}

func (b *bot) lastMsgs(c chan string) {
	b.last.Do(func(v interface{}) {
		if v != nil {
			l := v.(*irc.Line)
			c <- fmt.Sprintf("%v <%v> %v",
				l.Time.UTC().Format(time.Kitchen),
				l.Nick, l.Text())
		}
	})
}

func notify(conn *irc.Conn, target string) chan string {
	const maxLen = 500
	c := make(chan string, 1)
	go func() {
		for msg := range c {
			log.Println("send", msg)
			if len(msg) > maxLen {
				msg = msg[:maxLen] + "..."
			}
			conn.Notice(target, msg)
		}
	}()
	return c
}

func kicker(conn *irc.Conn, channel string) chan string {
	c := make(chan string, 1)
	go func() {
		for nick := range c {
			if nick != conn.Me().Nick {
				log.Println("kick", nick)
				conn.Kick(channel, nick)
			}
		}
	}()
	return c
}

func (b *bot) join() irc.HandlerFunc {
	return func(conn *irc.Conn, _ *irc.Line) {
		conn.Join(b.room)
	}
}

func discon(c chan struct{}) irc.HandlerFunc {
	return func(_ *irc.Conn, _ *irc.Line) {
		close(c)
	}
}

func (b *bot) privmsg() irc.HandlerFunc {
	l := links(b.notice)
	return func(conn *irc.Conn, line *irc.Line) {
		if isFlood(line.Text()) {
			b.kick <- line.Nick
		}
		switch line.Text() {
		case "last":
			c := notify(conn, line.Nick)
			defer close(c)
			b.lastMsgs(c)
		case "find":
			b.find(b.notice, line.Nick)
		default:
			b.push(line)
		}
		l <- line.Text()
	}
}

func main() {
	node := flag.String("node", "irc.freenode.org", "IRC Server")
	ssl := flag.Bool("ssl", false, "Use SSL")
	room := flag.String("room", "#lor", "IRC Channel")
	name := flag.String("name", "dim13", "Bots Name")
	flag.Parse()

	b := New(*name, *node, *room, *ssl)

	done := make(chan struct{})
	go Watch(b.notice, Feeds) // TODO shall it be there?

	// setup event handler
	handler := []struct {
		ev string
		f  irc.HandlerFunc
	}{
		{irc.DISCONNECTED, discon(done)},
		{irc.CONNECTED, b.join()},
		{irc.KICK, b.join()},
		{irc.PRIVMSG, b.privmsg()},
	}
	for _, h := range handler {
		b.conn.HandleFunc(h.ev, h.f)
	}

	if err := b.conn.Connect(); err != nil {
		log.Fatal(err)
	}

	log.Println("Connected")
	<-done
	log.Println("Disconnected")
}