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path: root/main.go
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package main

import (
	"flag"
	"fmt"
	"log"
	"strings"
	"time"

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

var (
	Version string
	Build   string
)

const maxLen = 500

type Notify struct {
	conn   *irc.Conn
	target string
}

func NewNotify(conn *irc.Conn, target string) *Notify {
	return &Notify{conn: conn, target: target}
}

func limit(n int, s string) string {
	r := []rune(s)
	if sz := len(r); sz > n {
		r = append(r[:n], []rune("...")...)
	}
	return string(r)
}

func (n *Notify) Write(p []byte) (int, error) {
	s := limit(maxLen, string(p))
	log.Println("send", s)
	n.conn.Notice(n.target, s)
	return len(p), nil
}

func privmsg(room string) irc.HandlerFunc {
	var (
		last   = make(map[string]string)
		lastRe = make(map[string]time.Time)
	)
	return func(conn *irc.Conn, line *irc.Line) {
		defer func() {
			if r := recover(); r != nil {
				log.Println("panic", r)
			}
		}()
		t := line.Text()
		switch {
		case line.Nick == conn.Me().Nick:
			// ignore self
		case isFlood(t):
			log.Println("flood", line.Nick)
			conn.Kick(room, line.Nick)
		case t == last[line.Nick]:
			log.Println("kick", line.Nick)
			conn.Kick(room, line.Nick)
		case strings.HasPrefix(t, "s"):
			global := strings.HasSuffix(t, "g")
			if tofix, ok := last[line.Nick]; ok {
				d := time.Since(lastRe[line.Nick])
				fixed, err := re(tofix, t[1:], global)
				if err == nil && fixed != tofix && d > time.Second*30 {
					lastRe[line.Nick] = time.Now()
					log.Println("regexp", t)
					fmt.Fprintf(NewNotify(conn, line.Target()), "%v meant to say: %s", line.Nick, fixed)
					return
				}
			}
			fallthrough
		default:
			for _, v := range getLinks(t) {
				title, err := getTitle(v)
				if err != nil {
					log.Println(v, err)
				}
				if title != "" {
					fmt.Fprintf(NewNotify(conn, line.Target()), "Title: %v", title)
				}
			}
			last[line.Nick] = t
		}
	}
}

func main() {
	var (
		node    = flag.String("node", "irc.freenode.org", "IRC Server")
		notls   = flag.Bool("notls", false, "disable TLS")
		room    = flag.String("room", "#lor", "IRC channel")
		name    = flag.String("name", "dim13", "bots name")
		version = flag.Bool("version", false, "display version and exit")
	)
	flag.Parse()

	if *version {
		log.Printf("Version: %v, Build: %v", Version, Build)
		return
	}

	conf := irc.NewConfig(*name)
	conf.Server = *node
	conf.SSL = !*notls
	conn := irc.Client(conf)

	done := make(chan struct{})

	conn.HandleFunc(irc.DISCONNECTED, func(_ *irc.Conn, _ *irc.Line) {
		close(done)
	})

	conn.HandleFunc(irc.CONNECTED, func(conn *irc.Conn, _ *irc.Line) {
		conn.Join(*room)
		Watch(NewNotify(conn, *room), Feeds)
	})

	conn.HandleFunc(irc.PRIVMSG, privmsg(*room))

	conn.HandleFunc(irc.KICK, func(conn *irc.Conn, _ *irc.Line) {
		conn.Join(*room)
	})

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