func (t *triviaChannel) Message(bot *bruxism.Bot, service bruxism.Service, message bruxism.Message) {
	if strings.ToLower(message.Message()) == t.Answer {
		t.Lock()
		defer t.Unlock()

		if !t.Active {
			return
		}

		ts := t.Scores[message.UserID()]
		if ts == nil {
			ts = &triviaScore{}
			t.Scores[message.UserID()] = ts
		}
		ts.Name = message.UserName()
		ts.Score++

		service.SendMessage(message.Channel(), fmt.Sprintf("%s got it! The answer was %s.", message.UserName(), t.Answer))
		service.SendMessage(message.Channel(), fmt.Sprintf("%s answered in %d seconds and their score is now %d.", message.UserName(), int(time.Now().Sub(t.Asked).Seconds()), ts.Score))

		t.Unanswered = 0

		if t.hintChan != nil {
			close(t.hintChan)
			t.hintChan = nil
		}
	}
}

func makeScriptFromMessages(service bruxism.Service, message bruxism.Message, messages []bruxism.Message) *comicgen.Script {
	speakers := make(map[string]int)
	avatars := make(map[int]string)

	script := []*comicgen.Message{}

	for _, message := range messages {
		speaker, ok := speakers[message.UserName()]
		if !ok {
			speaker = len(speakers)
			speakers[message.UserName()] = speaker
			avatars[speaker] = message.UserAvatar()
		}

		script = append(script, &comicgen.Message{
			Speaker: speaker,
			Text:    message.Message(),
			Author:  message.UserName(),
		})
	}
	return &comicgen.Script{
		Messages: script,
		Author:   fmt.Sprintf(service.UserName()),
		Avatars:  avatars,
		Type:     comicgen.ComicTypeChat,
	}
}

// Message handler.
func (p *YouTubeJoinPlugin) Message(bot *bruxism.Bot, service bruxism.Service, message bruxism.Message) {
	if (service.IsBotOwner(message) || service.IsChannelOwner(message)) && bruxism.MatchesCommand(service, "leave", message) {
		video, ok := p.youtube.VideoIDForChatID(message.Channel())
		if ok {
			channel, ok := p.youtube.ChannelIDForVideoID(video)
			if ok {
				p.Unmonitor(channel)
			}
		}
	}
}

func (p *topStreamersPlugin) messageFunc(bot *bruxism.Bot, service bruxism.Service, message bruxism.Message) {
	if !service.IsMe(message) {
		if bruxism.MatchesCommand(service, "topstreamers", message) {
			n := time.Now()
			if !n.After(p.lastUpdate.Add(1 * time.Minute)) {
				if p.lastMessage != "" {
					service.SendMessage(message.Channel(), fmt.Sprintf("%s *Last updated %s.*", p.lastMessage, humanize.Time(p.lastUpdate)))
				}
				return
			}

			service.Typing(message.Channel())

			p.lastUpdate = n

			m, err := p.topStreamers(5)
			if err != nil {
				service.SendMessage(message.Channel(), "There was an error while requesting the top streamers, please try again later.")
				return
			}

			service.SendMessage(message.Channel(), m)
			p.lastMessage = m
		}
	}
}

// MTGCommand is a command for getting information about MTG cards..
func MTGCommand(bot *bruxism.Bot, service bruxism.Service, message bruxism.Message, command string, parts []string) {
	cardNames := fuzzy.RankFindFold(command, MTGCardNames)
	if len(cardNames) == 0 {
		service.SendMessage(message.Channel(), "Could not find a card with that name, sorry.")
		return
	}

	sort.Sort(cardNames)

	card := MTGCardMap[cardNames[0].Target]

	rest := ""
	if card.Text != "" {
		rest += "\n"
	}
	if card.Power != nil {
		rest += MTGRestReplacer.Replace(fmt.Sprintf("%s/%s", *card.Power, *card.Toughness))
	}
	if card.Loyalty != nil {
		rest += MTGRestReplacer.Replace(fmt.Sprintf("%d", *card.Loyalty))
	}
	if card.ID != nil {
		if rest != "" && rest != "\n" {
			rest += "\n"
		}
		rest += fmt.Sprintf("(http://gatherer.wizards.com/Handlers/Image.ashx?multiverseid=%d&type=card)", *card.ID)
	}

	if service.Name() == bruxism.DiscordServiceName {
		service.SendMessage(message.Channel(), fmt.Sprintf("**%s** %s\n*%s*\n%s%s", card.Name, card.ManaCost, card.Type, MTGTextReplacer.Replace(card.Text), rest))
	} else {
		service.SendMessage(message.Channel(), strings.Replace(fmt.Sprintf("%s. %s. %s. %s%s", card.Name, card.Type, card.ManaCost, card.Text, rest), "\n", " ", -1))
	}
}

// InviteCommand is a command for accepting an invite to a channel.
func InviteCommand(bot *bruxism.Bot, service bruxism.Service, message bruxism.Message, command string, parts []string) {
	if service.Name() == bruxism.DiscordServiceName {
		discord := service.(*bruxism.Discord)

		if discord.ApplicationClientID != "" {
			service.SendMessage(message.Channel(), fmt.Sprintf("Please visit https://discordapp.com/oauth2/authorize?client_id=%s&scope=bot to add %s to your server.", discord.ApplicationClientID, service.UserName()))
			return
		}
	}

	if len(parts) == 1 {
		join := parts[0]
		if service.Name() == bruxism.DiscordServiceName {
			join = discordInviteID(join)
		}
		if err := service.Join(join); err != nil {
			if service.Name() == bruxism.DiscordServiceName && err == bruxism.ErrAlreadyJoined {
				service.PrivateMessage(message.UserID(), "I have already joined that server.")
				return
			}
			log.Println("Error joining %s %v", service.Name(), err)
		} else if service.Name() == bruxism.DiscordServiceName {
			service.PrivateMessage(message.UserID(), "I have joined that server.")
		}
	}
}

func emojiMessageFunc(bot *bruxism.Bot, service bruxism.Service, message bruxism.Message) {
	if service.Name() == bruxism.DiscordServiceName && !service.IsMe(message) {
		if bruxism.MatchesCommand(service, "emoji", message) || bruxism.MatchesCommand(service, "hugemoji", message) {
			base := "emoji/twitter"
			if bruxism.MatchesCommand(service, "hugemoji", message) {
				base = "emoji/twitterhuge"
			}
			_, parts := bruxism.ParseCommand(service, message)
			if len(parts) == 1 {
				submatches := discordRegex.FindStringSubmatch(parts[0])
				if len(submatches) != 0 {
					h, err := http.Get("https://cdn.discordapp.com/emojis/" + submatches[1] + ".png")
					if err != nil {
						return
					}

					service.SendFile(message.Channel(), "emoji.png", h.Body)
					h.Body.Close()

					return

				}

				s := strings.TrimSpace(parts[0])
				for i := range s {
					filename := emojiFile(base, s[i:])
					if filename != "" {
						if f, err := os.Open(fmt.Sprintf("%s/%s.png", base, filename)); err == nil {
							defer f.Close()
							service.SendFile(message.Channel(), "emoji.png", f)

							return
						}
					}
				}
			}
		}
	}
}

// Help returns a list of help strings that are printed when the user requests them.
func (p *MusicPlugin) Help(bot *bruxism.Bot, service bruxism.Service, message bruxism.Message, detailed bool) []string {

	// Only show help messages for guilds where we have a voice connection
	c, err := p.discord.Channel(message.Channel())
	if err != nil {
		log.Println("musicplugin: fetching channel err:", err.Error())
		return nil
	}

	_, ok := p.VoiceConnections[c.GuildID]
	if !ok {
		return nil
	}

	help := []string{
		bruxism.CommandHelp(service, "music", "<command>", "Music Plugin, see `help music`")[0],
	}

	if detailed {
		help = append(help, []string{
			"Examples:",
			bruxism.CommandHelp(service, "music", "join [channelid]", "Join your voice channel or the provided voice channel.")[0],
			bruxism.CommandHelp(service, "music", "leave", "Leave current voice channel.")[0],
			bruxism.CommandHelp(service, "music", "play [url]", "Start playing music and optionally enqueue provided url.")[0],
			bruxism.CommandHelp(service, "music", "info", "Information about this plugin and the currently playing song.")[0],
			bruxism.CommandHelp(service, "music", "pause", "Pause playback of current song.")[0],
			bruxism.CommandHelp(service, "music", "resume", "Resume playback of current song.")[0],
			bruxism.CommandHelp(service, "music", "skip", "Skip current song.")[0],
			bruxism.CommandHelp(service, "music", "stop", "Stop playing music.")[0],
			bruxism.CommandHelp(service, "music", "list", "List contents of queue.")[0],
			bruxism.CommandHelp(service, "music", "clear", "Clear all items from queue.")[0],
		}...)
	}

	return help
}

func messageFunc(bot *bruxism.Bot, service bruxism.Service, message bruxism.Message) {
	if service.IsMe(message) || !bruxism.MatchesCommand(service, "myson", message) || service.Name() != bruxism.DiscordServiceName {
		return
	}

	discord := service.(*bruxism.Discord)
	discord.Session.ChannelMessageSendEmbed(message.Channel(), &discordgo.MessageEmbed{
		Color:       discord.UserColor(service.UserID(), message.Channel()),
		Description: "Don't ever talk to me or my son ever again.",
		Author: &discordgo.MessageEmbedAuthor{
			Name:    discord.NicknameForID(service.UserID(), service.UserName(), message.Channel()),
			IconURL: discordgo.EndpointUserAvatar(service.UserID(), discord.Session.State.User.Avatar),
		},
	})
}

func (p *streamerPlugin) messageFunc(bot *bruxism.Bot, service bruxism.Service, message bruxism.Message) {
	if !service.IsMe(message) {
		if bruxism.MatchesCommand(service, "streamer", message) {
			query, parts := bruxism.ParseCommand(service, message)

			if len(parts) == 0 {
				return
			}

			r, _ := p.requests[query]
			if r == nil {
				r = &streamerPluginRequest{}
				p.requests[query] = r
			}

			n := time.Now()
			if !n.After(r.lastUpdate.Add(60 * time.Minute)) {
				if r.lastMessage != "" {
					service.SendMessage(message.Channel(), fmt.Sprintf("%s *Last updated %s.*", r.lastMessage, humanize.Time(r.lastUpdate)))
				}
				return
			}

			service.Typing(message.Channel())

			r.lastUpdate = n

			m, err := p.streamer(query, service.Name() == bruxism.DiscordServiceName)
			if err != nil {
				service.SendMessage(message.Channel(), "There was an error while requesting the streamer, please try again later.")
				return
			}

			service.SendMessage(message.Channel(), m)
			r.lastMessage = m
		}
	}
}

// NumberTriviaCommand is a command for getting number trivial.
func NumberTriviaCommand(bot *bruxism.Bot, service bruxism.Service, message bruxism.Message, command string, parts []string) {
	notfound := true
	num := rand.Intn(1000)
	if len(parts) == 1 {
		if i, err := strconv.Atoi(parts[0]); err == nil {
			num = i
			notfound = false
		}
	}

	service.Typing(message.Channel())

	str, err := numberTrivia(bot, num, notfound)
	if err != nil {
		service.SendMessage(message.Channel(), "There was an error requesting trivia, sorry!")
		return
	}

	service.SendMessage(message.Channel(), str)
}

func avatarMessageFunc(bot *bruxism.Bot, service bruxism.Service, message bruxism.Message) {
	if !service.IsMe(message) {
		if bruxism.MatchesCommand(service, "avatar", message) {
			query := strings.Join(strings.Split(message.RawMessage(), " ")[1:], " ")

			id := message.UserID()
			match := userIDRegex.FindStringSubmatch(query)
			if match != nil {
				id = match[1]
			}

			discord := service.(*bruxism.Discord)

			u, err := discord.Session.User(id)
			if err != nil {
				return
			}

			service.SendMessage(message.Channel(), discordgo.EndpointUserAvatar(u.ID, u.Avatar))
		}
	}
}

func (p *playedPlugin) Message(bot *bruxism.Bot, service bruxism.Service, message bruxism.Message) {
	defer bruxism.MessageRecover()
	if service.Name() == bruxism.DiscordServiceName && !service.IsMe(message) {
		if bruxism.MatchesCommand(service, "played", message) {
			query := strings.Join(strings.Split(message.RawMessage(), " ")[1:], " ")

			id := message.UserID()
			match := userIDRegex.FindStringSubmatch(query)
			if match != nil {
				id = match[1]
			}

			p.Lock()
			defer p.Unlock()

			u := p.Users[id]
			if u == nil {
				service.SendMessage(message.Channel(), "I haven't seen that user.")
				return
			}

			if len(u.Entries) == 0 {
				service.SendMessage(message.Channel(), "I haven't seen anything played by that user.")
				return
			}

			lc := humanize.Time(u.LastChanged)
			u.Update(u.Current, time.Now())

			pes := make(byDuration, len(u.Entries))
			i := 0
			for _, pe := range u.Entries {
				pes[i] = pe
				i++
			}

			sort.Sort(pes)

			messageText := fmt.Sprintf("*First seen %s, last update %s*\n", humanize.Time(u.FirstSeen), lc)
			for i = 0; i < len(pes) && i < 5; i++ {
				pe := pes[i]

				du := pe.Duration

				ds := ""
				hours := int(du / time.Hour)
				if hours > 0 {
					ds += fmt.Sprintf("%dh ", hours)
					du -= time.Duration(hours) * time.Hour
				}

				minutes := int(du / time.Minute)
				if minutes > 0 || len(ds) > 0 {
					ds += fmt.Sprintf("%dm ", minutes)
					du -= time.Duration(minutes) * time.Minute
				}

				seconds := int(du / time.Second)
				ds += fmt.Sprintf("%ds", seconds)

				messageText += fmt.Sprintf("**%s**: %s\n", pe.Name, ds)
			}
			service.SendMessage(message.Channel(), messageText)
		}
	}
}

// Message handler.
func (p *livePlugin) Message(bot *bruxism.Bot, service bruxism.Service, message bruxism.Message) {
	defer bruxism.MessageRecover()
	if !service.IsMe(message) {
		messageChannel := message.Channel()

		if bruxism.MatchesCommand(service, "live", message) {
			ticks := ""
			if service.Name() == bruxism.DiscordServiceName {
				ticks = "`"
			}

			_, parts := bruxism.ParseCommand(service, message)

			if len(parts) == 0 {
				service.SendMessage(messageChannel, fmt.Sprintf("Incorrect command. eg: %s%slive [add|remove|list] <%s>%s", ticks, service.CommandPrefix(), "UCGmC0A8mEAPdlELQdP9xJbw", ticks))
			}

			switch parts[0] {
			case "list":
				if !service.IsModerator(message) {
					service.SendMessage(messageChannel, "I'm sorry, you must be the channel owner to list live announcements.")
					return
				}
				list := []string{}
				p.Lock()
				for ytChannel := range p.ChannelToYouTubeChannels[messageChannel] {
					list = append(list, fmt.Sprintf("%s (%s)", p.ytLiveChannel.ChannelName(ytChannel), ytChannel))
				}
				p.Unlock()
				if len(list) == 0 {
					service.SendMessage(messageChannel, "No Channels are being announced.")
				} else {
					service.SendMessage(messageChannel, fmt.Sprintf("Currently announcing: %s", strings.Join(list, ",")))
				}
			case "add":
				if !service.IsModerator(message) {
					service.SendMessage(messageChannel, "I'm sorry, you must be the channel owner to add live announcements.")
					return
				}
				if len(parts) != 2 || len(parts[1]) != 24 {
					service.SendMessage(messageChannel, fmt.Sprintf("Incorrect Channel ID. eg: %s%slive %s %s%s", ticks, service.CommandPrefix(), parts[0], "UCGmC0A8mEAPdlELQdP9xJbw", ticks))
					return
				}
				err := p.monitor(messageChannel, parts[1])
				if err != nil {
					service.SendMessage(messageChannel, fmt.Sprintf("Could not add Channel ID. %s", err))
					return
				}
				service.SendMessage(messageChannel, fmt.Sprintf("Messages will be sent here when %s goes live.", p.ytLiveChannel.ChannelName(parts[1])))
			case "remove":
				if !service.IsModerator(message) {
					service.SendMessage(messageChannel, "I'm sorry, you must be the channel owner to remove live announcements.")
					return
				}
				if len(parts) != 2 || len(parts[1]) != 24 {
					service.SendMessage(messageChannel, fmt.Sprintf("Incorrect Channel ID. eg: %s%slive %s %s%s", ticks, service.CommandPrefix(), parts[0], "UCGmC0A8mEAPdlELQdP9xJbw", ticks))
					return
				}
				p.Lock()
				delete(p.ChannelToYouTubeChannels[messageChannel], parts[1])
				delete(p.youTubeChannelToChannels[parts[1]], messageChannel)
				p.Unlock()
				service.SendMessage(messageChannel, fmt.Sprintf("Messages will no longer be sent here when %s goes live.", p.ytLiveChannel.ChannelName(parts[1])))
			}
		}
	}
}

func (p *chartPlugin) messageFunc(bot *bruxism.Bot, service bruxism.Service, message bruxism.Message) {
	if service.IsMe(message) {
		return
	}

	if bruxism.MatchesCommand(service, "chart", message) {
		query, parts := bruxism.ParseCommand(service, message)
		if len(parts) == 0 {
			service.SendMessage(message.Channel(), fmt.Sprintf("Invalid chart eg: %s", p.randomChart(service)))
			return
		}

		start, end := 0.5, 0.5

		switch parts[0] {
		case "up":
			start, end = 0, 1
		case "down":
			start, end = 1, 0
		case "flat":
		case "straight":
		default:
			service.SendMessage(message.Channel(), fmt.Sprintf("Invalid chart direction. eg: %s", p.randomChart(service)))
			return
		}

		axes := strings.Split(query[len(parts[0]):], ",")
		if len(axes) != 2 {
			service.SendMessage(message.Channel(), fmt.Sprintf("Invalid chart axis labels eg: %s", p.randomChart(service)))
			return
		}

		pl, err := plot.New()
		if err != nil {
			service.SendMessage(message.Channel(), fmt.Sprintf("Error making chart, sorry! eg: %s", p.randomChart(service)))
			return
		}

		service.Typing(message.Channel())

		pl.Y.Label.Text = axes[0]
		pl.X.Label.Text = axes[1]

		num := 5 + rand.Intn(15)

		start *= float64(num)
		end *= float64(num)

		pts := make(plotter.XYs, num)
		for i := range pts {
			pts[i].X = float64(i) + rand.Float64()*0.5 - 0.2
			pts[i].Y = start + float64(end-start)/float64(num-1)*float64(i) + rand.Float64()*0.5 - 0.25
		}

		pl.X.Tick.Label.Color = color.Transparent
		pl.Y.Tick.Label.Color = color.Transparent

		pl.X.Min = -0.5
		pl.X.Max = float64(num) + 0.5

		pl.Y.Min = -0.5
		pl.Y.Max = float64(num) + 0.5

		lpLine, lpPoints, err := plotter.NewLinePoints(pts)
		if err != nil {
			service.SendMessage(message.Channel(), fmt.Sprintf("Sorry %s, there was a problem creating your chart.", message.UserName()))
		}
		lpLine.Color = plotutil.Color(rand.Int())
		lpLine.Width = vg.Points(1 + 0.5*rand.Float64())
		lpLine.Dashes = plotutil.Dashes(rand.Int())
		lpPoints.Shape = plotutil.Shape(rand.Int())
		lpPoints.Color = lpLine.Color

		pl.Add(lpLine, lpPoints)

		w, err := pl.WriterTo(320, 240, "png")
		if err != nil {
			service.SendMessage(message.Channel(), fmt.Sprintf("Sorry %s, there was a problem creating your chart.", message.UserName()))
			return
		}

		b := &bytes.Buffer{}
		w.WriteTo(b)

		go func() {
			if service.Name() == bruxism.DiscordServiceName {
				discord := service.(*bruxism.Discord)
				p, err := discord.UserChannelPermissions(message.UserID(), message.Channel())
				if err == nil && p&discordgo.PermissionAttachFiles != 0 {
					service.SendFile(message.Channel(), "chart.png", b)
					return
				}
			}

			url, err := bot.UploadToImgur(b, "chart.png")
			if err != nil {
				service.SendMessage(message.Channel(), fmt.Sprintf("Sorry %s, there was a problem uploading the chart to imgur.", message.UserName()))
				log.Println("Error uploading chart: ", err)
				return
			}
//.........这里部分代码省略.........

func (p *ReminderPlugin) Message(bot *bruxism.Bot, service bruxism.Service, message bruxism.Message) {
	if !service.IsMe(message) {
		if bruxism.MatchesCommand(service, "remind", message) || bruxism.MatchesCommand(service, "reminder", message) {
			_, parts := bruxism.ParseCommand(service, message)

			if len(parts) < 2 {
				service.SendMessage(message.Channel(), fmt.Sprintf("Invalid reminder, no time or message. eg: %s", p.randomReminder(service)))
				return
			}

			t, r, err := p.parseReminder(parts)

			now := time.Now()

			if err != nil || t.Before(now) || t.After(now.Add(time.Hour*24*365+time.Hour)) {
				service.SendMessage(message.Channel(), fmt.Sprintf("Invalid time. eg: %s", strings.Join(randomTimes, ", ")))
				return
			}

			if r == "" {
				service.SendMessage(message.Channel(), fmt.Sprintf("Invalid reminder, no message. eg: %s", p.randomReminder(service)))
				return
			}

			requester := message.UserName()
			if service.Name() == bruxism.DiscordServiceName {
				requester = fmt.Sprintf("<@%s>", message.UserID())
			}

			err = p.AddReminder(&Reminder{
				StartTime: now,
				Time:      t,
				Requester: requester,
				Target:    message.Channel(),
				Message:   r,
				IsPrivate: service.IsPrivate(message),
			})
			if err != nil {
				service.SendMessage(message.Channel(), err.Error())
				return
			}

			service.SendMessage(message.Channel(), fmt.Sprintf("Reminder set for %s.", humanize.Time(t)))
		}
	}
}

// Message handler.
func (p *MusicPlugin) Message(bot *bruxism.Bot, service bruxism.Service, message bruxism.Message) {
	defer bruxism.MessageRecover()

	if service.IsMe(message) {
		return
	}

	if !bruxism.MatchesCommand(service, "music", message) && !bruxism.MatchesCommand(service, "mu", message) {
		return
	}

	_, parts := bruxism.ParseCommand(service, message)

	if len(parts) == 0 {
		service.SendMessage(message.Channel(), strings.Join(p.Help(bot, service, message, true), "\n"))
		return
	}

	// Get the Channel (and GuildID) for this channel because it's needed in
	// a few locations below
	channel, err := p.discord.Channel(message.Channel())
	if err != nil {
		log.Println("musicplugin: fetching channel err:", err.Error())
		return
	}

	// grab pointer to this channels voice connection, if exists.
	vc, vcok := p.VoiceConnections[channel.GuildID]

	switch parts[0] {

	case "help":
		// display extended help information
		service.SendMessage(message.Channel(), strings.Join(p.Help(bot, service, message, true), "\n"))

	case "stats":
		// TODO: maybe provide plugin stats, total channels, total song queues, etc

	case "join":
		if !service.IsBotOwner(message) {
			service.SendMessage(message.Channel(), "Sorry, only bot owner can join, please ask him to run this command.")
			return
		}
		// join the voice channel of the caller or the provided channel ID

		channelID := ""
		if len(parts) > 1 {
			channelID = parts[1]
		}

		if channelID == "" {
			messageUserID := message.UserID()
			for _, g := range p.discord.Guilds() {
				for _, v := range g.VoiceStates {
					if v.UserID == messageUserID {
						channelID = v.ChannelID
					}
				}
			}

			if channelID == "" {
				service.SendMessage(message.Channel(), "I couldn't find you in any voice channels, please join one.")
				return
			}
		}

		_, err := p.join(channelID)
		if err != nil {
			service.SendMessage(message.Channel(), err.Error())
			break
		}

		service.SendMessage(message.Channel(), "Now, let's play some music!")

	case "leave":
		// leave voice channel for this Guild
		if !service.IsBotOwner(message) {
			service.SendMessage(message.Channel(), "Sorry, only bot owner can leave, please ask him to run this command.")
			return
		}

		if !vcok {
			service.SendMessage(message.Channel(), "There is no voice connection for this Guild.")
		}

		vc.conn.Close()
		delete(p.VoiceConnections, channel.GuildID)
		service.SendMessage(message.Channel(), "Closed voice connection.")

	case "debug":
		// enable or disable debug

		if !vcok {
			service.SendMessage(message.Channel(), fmt.Sprintf("There is no voice connection for this Guild."))
		}

		vc.Lock()
		vc.debug = !vc.debug
		service.SendMessage(message.Channel(), fmt.Sprintf("debug mode set to %v", vc.debug))
//.........这里部分代码省略.........

// enqueue a song/playlest to a VoiceConnections Queue
func (p *MusicPlugin) enqueue(vc *voiceConnection, url string, service bruxism.Service, message bruxism.Message) (err error) {

	if vc == nil {
		return fmt.Errorf("Cannot enqueue to nil voice connection.")
	}

	if url == "" {
		return fmt.Errorf("Cannot enqueue an empty string.")
	}

	// TODO //////////////////////////////////////////////////////////////////
	// need to parse the url and have a way to know what we're doing
	// 1) option to queue local files
	// 2) option to queue saved playlists
	// 3) option to queue URL that can be passed directly to ffmpeg without youtube-dl
	// 4) option to queue youtube-dl playlist
	// 5) option to queue youtube-dl song
	// 6) option to queue youtube-dl search result

	// right now option 4 and 5 work, only.
	//////////////////////////////////////////////////////////////////////////

	cmd := exec.Command("./youtube-dl", "-i", "-j", "--youtube-skip-dash-manifest", url)
	if vc.debug {
		cmd.Stderr = os.Stderr
	}

	output, err := cmd.StdoutPipe()
	if err != nil {
		log.Println(err)
		service.SendMessage(message.Channel(), fmt.Sprintf("Error adding song to playlist."))
		return
	}

	err = cmd.Start()
	if err != nil {
		log.Println(err)
		service.SendMessage(message.Channel(), fmt.Sprintf("Error adding song to playlist."))
		return
	}
	defer func() {
		go cmd.Wait()
	}()

	scanner := bufio.NewScanner(output)

	for scanner.Scan() {
		s := song{}
		err = json.Unmarshal(scanner.Bytes(), &s)
		if err != nil {
			log.Println(err)
			continue
		}

		s.AddedBy = message.UserName()

		vc.Lock()
		vc.Queue = append(vc.Queue, s)
		vc.Unlock()
	}
	return
}

func (p *comicPlugin) makeComic(bot *bruxism.Bot, service bruxism.Service, message bruxism.Message, script *comicgen.Script) {
	p.Comics++
	comic := comicgen.NewComicGen("arial", service.Name() != bruxism.DiscordServiceName)
	image, err := comic.MakeComic(script)
	if err != nil {
		service.SendMessage(message.Channel(), fmt.Sprintf("Sorry %s, there was an error creating the comic. %s", message.UserName(), err))
	} else {
		go func() {
			if service.Name() == bruxism.DiscordServiceName {
				discord := service.(*bruxism.Discord)
				p, err := discord.UserChannelPermissions(message.UserID(), message.Channel())
				if err == nil && p&discordgo.PermissionAttachFiles != 0 {
					b := &bytes.Buffer{}
					err = png.Encode(b, image)
					if err != nil {
						service.SendMessage(message.Channel(), fmt.Sprintf("Sorry %s, there was a problem creating your comic.", message.UserName()))
						return
					}

					if err := service.SendFile(message.Channel(), "comic.png", b); err == nil {
						return
					}
				}
			}

			b := &bytes.Buffer{}
			err = png.Encode(b, image)
			if err != nil {
				service.SendMessage(message.Channel(), fmt.Sprintf("Sorry %s, there was a problem creating your comic.", message.UserName()))
				return
			}

			url, err := bot.UploadToImgur(b, "comic.png")
			if err != nil {
				service.SendMessage(message.Channel(), fmt.Sprintf("Sorry %s, there was a problem uploading the comic to imgur.", message.UserName()))
				log.Println("Error uploading comic: ", err)
				return
			}

			if service.Name() == bruxism.DiscordServiceName {
				service.SendMessage(message.Channel(), fmt.Sprintf("Here's your comic <@%s>: %s", message.UserID(), url))
			} else {
				service.SendMessage(message.Channel(), fmt.Sprintf("Here's your comic %s: %s", message.UserName(), url))
			}

			runtime.GC()
		}()
	}
}

// StatsCommand returns bot statistics.
func StatsCommand(bot *bruxism.Bot, service bruxism.Service, message bruxism.Message, command string, parts []string) {
	stats := runtime.MemStats{}
	runtime.ReadMemStats(&stats)

	w := &tabwriter.Writer{}
	buf := &bytes.Buffer{}

	w.Init(buf, 0, 4, 0, ' ', 0)
	if service.Name() == bruxism.DiscordServiceName {
		fmt.Fprintf(w, "```\n")
	}
	fmt.Fprintf(w, "Bruxism: \t%s\n", bruxism.VersionString)
	if service.Name() == bruxism.DiscordServiceName {
		fmt.Fprintf(w, "Discordgo: \t%s\n", discordgo.VERSION)
	}
	fmt.Fprintf(w, "Go: \t%s\n", runtime.Version())
	fmt.Fprintf(w, "Uptime: \t%s\n", getDurationString(time.Now().Sub(statsStartTime)))
	fmt.Fprintf(w, "Memory used: \t%s / %s (%s garbage collected)\n", humanize.Bytes(stats.Alloc), humanize.Bytes(stats.Sys), humanize.Bytes(stats.TotalAlloc))
	fmt.Fprintf(w, "Concurrent tasks: \t%d\n", runtime.NumGoroutine())
	if service.Name() == bruxism.DiscordServiceName {
		discord := service.(*bruxism.Discord)
		fmt.Fprintf(w, "Connected servers: \t%d\n", service.ChannelCount())
		if len(discord.Sessions) > 1 {
			shards := 0
			for _, s := range discord.Sessions {
				if s.DataReady {
					shards++
				}
			}
			if shards == len(discord.Sessions) {
				fmt.Fprintf(w, "Shards: \t%d\n", shards)
			} else {
				fmt.Fprintf(w, "Shards: \t%d (%d connected)\n", len(discord.Sessions), shards)
			}
			guild, err := discord.Channel(message.Channel())
			if err == nil {
				id, err := strconv.Atoi(guild.ID)
				if err == nil {
					fmt.Fprintf(w, "Current shard: \t%d\n", ((id>>22)%len(discord.Sessions) + 1))
				}
			}
		}
	} else {
		fmt.Fprintf(w, "Connected channels: \t%d\n", service.ChannelCount())
	}

	plugins := bot.Services[service.Name()].Plugins
	names := []string{}
	for _, plugin := range plugins {
		names = append(names, plugin.Name())
		sort.Strings(names)
	}

	for _, name := range names {
		stats := plugins[name].Stats(bot, service, message)
		for _, stat := range stats {
			fmt.Fprint(w, stat)
		}
	}

	if service.Name() == bruxism.DiscordServiceName {
		fmt.Fprintf(w, "\n```")
	}

	w.Flush()
	out := buf.String()

	end := ""
	if IsSeptapus {
		end += "Septapus community: <https://discord.gg/HWN9pwj>\nPatreon: <https://www.patreon.com/iopred>\nBuilt with love by iopred."
	}

	if service.SupportsMultiline() {
		if end != "" {
			out += "\n" + end
		}
		service.SendMessage(message.Channel(), out)
	} else {
		service.SendMessage(message.Channel(), strings.Join(strings.Split(out, "\n"), " "))
		service.SendMessage(message.Channel(), strings.Join(strings.Split(end, "\n"), " "))
	}
}