Refactored handlers and command handlers

bot/bot.go

@@ -1,11 +1,15 @@
 package bot
 
 import (
+	"errors"
 	"fmt"
 	"os"
 	"os/signal"
 	"syscall"
 
+	"git.kill0.net/chill9/beepboop/command"
+	"git.kill0.net/chill9/beepboop/config"
+	"git.kill0.net/chill9/beepboop/handler"
 	"git.kill0.net/chill9/beepboop/lib"
 	"github.com/bwmarrin/discordgo"
 	log "github.com/sirupsen/logrus"
@@ -13,14 +17,23 @@ import (
 	"github.com/spf13/viper"
 )
 
-var C Config
+var C *config.Config
 
 type (
 	Bot struct {
-		Session *discordgo.Session
-		Config  Config
+		config   *config.Config
+		session  *discordgo.Session
+		commands map[string]*Command
 	}
 
+	Command struct {
+		Name  string
+		Func  CommandFunc
+		NArgs int
+	}
+
+	CommandFunc func(args []string, s *discordgo.Session, m *discordgo.MessageCreate) error
+
 	MessageHandler func(s *discordgo.Session, m *discordgo.MessageCreate)
 )
 
@@ -31,50 +44,110 @@ func init() {
 	viper.BindPFlags(pflag.CommandLine)
 }
 
-func NewBot(s *discordgo.Session, config Config) *Bot {
-	return &Bot{Session: s, Config: config}
+func NewBot(config *config.Config, s *discordgo.Session) *Bot {
+	return &Bot{
+		session:  s,
+		commands: make(map[string]*Command),
+	}
 }
 
-func (b *Bot) RegisterCommands() {
-	AddCommand(&Command{
+func (b *Bot) AddHandler(handler interface{}) func() {
+	return b.session.AddHandler(handler)
+}
+
+func (b *Bot) AddCommand(cmd *Command) {
+	b.commands[cmd.Name] = cmd
+}
+
+func (b *Bot) GetCommand(name string) (*Command, bool) {
+	cmd, ok := b.commands[name]
+	return cmd, ok
+}
+
+func (b *Bot) CommandHandler(s *discordgo.Session, m *discordgo.MessageCreate) {
+	if m.Author.ID == s.State.User.ID {
+		return
+	}
+
+	if !lib.HasCommand(m.Content, b.config.Prefix) {
+		return
+	}
+
+	cmdName, arg := lib.SplitCommandAndArg(m.Content, b.config.Prefix)
+
+	cmd, ok := b.GetCommand(cmdName)
+	if !ok {
+		return
+	}
+
+	args := lib.SplitArgs(arg, cmd.NArgs)
+
+	if ok {
+		log.Debugf("command: %v, args: %v, nargs: %d", cmd.Name, args, len(args))
+		if err := cmd.Func(args, s, m); err != nil {
+			log.Errorf("failed to execute command: %s", err)
+		}
+
+		return
+	}
+
+	log.Warnf("unknown command: %v, args: %v, nargs: %d", cmdName, args, len(args))
+	s.ChannelMessageSend(m.ChannelID, fmt.Sprintf("unknown command: %s", cmdName))
+}
+
+func (b *Bot) Init(h *handler.Handlers, ch *command.Handlers) {
+	// Register handlers
+	b.AddHandler(h.Reaction)
+
+	// Register commands
+	b.AddCommand(&Command{
 		Name: "coin",
-		Func: b.CoinCommand(),
+		Func: ch.Coin,
 	})
-	AddCommand(&Command{
+	b.AddCommand(&Command{
 		Name:  "deal",
-		Func:  b.DealCommand(),
+		Func:  ch.Deal,
 		NArgs: 1,
 	})
-	AddCommand(&Command{
+	b.AddCommand(&Command{
 		Name: "ping",
-		Func: b.PingCommand(),
+		Func: ch.Ping,
 	})
-	AddCommand(&Command{
+	b.AddCommand(&Command{
 		Name:  "roll",
-		Func:  b.RollCommand(),
+		Func:  ch.Roll,
 		NArgs: 1,
 	})
-	AddCommand(&Command{
+	b.AddCommand(&Command{
+		Name: "roulette",
+		Func: ch.Roulette,
+	})
+	b.AddCommand(&Command{
+		Name:  "rps",
+		Func:  ch.Rps,
+		NArgs: 1,
+	})
+	b.AddCommand(&Command{
+		Name:  "rpsls",
+		Func:  ch.Rpsls,
+		NArgs: 1,
+	})
+	b.AddCommand(&Command{
 		Name:  "time",
-		Func:  b.TimeCommand(),
+		Func:  ch.Time,
 		NArgs: 1,
 	})
-	AddCommand(&Command{
+	b.AddCommand(&Command{
 		Name: "version",
-		Func: b.VersionCommand(),
+		Func: ch.Version,
 	})
-	AddCommand(&Command{
+	b.AddCommand(&Command{
 		Name:  "weather",
-		Func:  b.WeatherCommand(),
+		Func:  ch.Weather,
 		NArgs: 1,
 	})
 }
 
-func (b *Bot) RegisterHandlers() {
-	b.Session.AddHandler(b.CommandHandler())
-	b.Session.AddHandler(b.ReactionHandler())
-}
-
 func Run() error {
 	initConfig()
 	go reloadConfig()
@@ -84,22 +157,21 @@ func Run() error {
 	}
 
 	if C.DiscordToken == "" {
-		log.Fatalf("Discord token is not set")
+		return errors.New("discord token not set")
 	}
 
 	dg, err := discordgo.New(fmt.Sprintf("Bot %s", C.DiscordToken))
 	if err != nil {
-		log.Fatalf("error creating Discord session: %v\n", err)
+		return fmt.Errorf("error creating discord session: %v", err)
 	}
 
-	b := NewBot(dg, C)
-	b.RegisterHandlers()
-	b.RegisterCommands()
+	b := NewBot(C, dg)
+	b.Init(handler.NewHandlers(C), command.NewHandlers(C))
 
 	dg.Identify.Intents = discordgo.IntentsGuildMessages | discordgo.IntentsDirectMessages
 
 	if err = dg.Open(); err != nil {
-		log.Fatalf("error opening connection: %v\n", err)
+		return fmt.Errorf("error opening connection: %v", err)
 	}
 
 	log.Info("The bot is now running. Press CTRL-C to exit.")
@@ -116,7 +188,7 @@ func Run() error {
 }
 
 func initConfig() {
-	C = NewConfig()
+	C = config.NewConfig()
 
 	viper.SetEnvPrefix("BEEPBOOP")
 	viper.AutomaticEnv()

bot/coin.go

@@ -1,31 +0,0 @@
-package bot
-
-import (
-	"git.kill0.net/chill9/beepboop/lib"
-	"github.com/bwmarrin/discordgo"
-)
-
-type Coin bool
-
-func (c *Coin) Flip() bool {
-	*c = Coin(lib.Itob(lib.RandInt(0, 1)))
-	return bool(*c)
-}
-
-func (b *Bot) CoinCommand() CommandFunc {
-	return func(args []string, m *discordgo.MessageCreate) error {
-		var (
-			c   Coin
-			msg string
-		)
-
-		if c.Flip() {
-			msg = "heads"
-		} else {
-			msg = "tails"
-		}
-
-		b.Session.ChannelMessageSend(m.ChannelID, msg)
-		return nil
-	}
-}

bot/command.go

@@ -1,90 +0,0 @@
-package bot
-
-import (
-	"fmt"
-
-	"git.kill0.net/chill9/beepboop/lib"
-	"github.com/bwmarrin/discordgo"
-	log "github.com/sirupsen/logrus"
-)
-
-var (
-	DefaultCommander *Commander
-)
-
-type (
-	Commander struct {
-		commands map[string]*Command
-	}
-
-	Command struct {
-		Name   string
-		Config Config
-		Func   CommandFunc
-		NArgs  int
-	}
-
-	CommandFunc func(args []string, m *discordgo.MessageCreate) error
-)
-
-func init() {
-	DefaultCommander = NewCommander()
-}
-
-func NewCommander() *Commander {
-	cmdr := new(Commander)
-	cmdr.commands = make(map[string]*Command)
-	return cmdr
-}
-
-func (cmdr *Commander) AddCommand(cmd *Command) {
-	cmdr.commands[cmd.Name] = cmd
-}
-
-func (cmdr *Commander) GetCommand(name string) (*Command, bool) {
-	cmd, ok := cmdr.commands[name]
-	return cmd, ok
-}
-
-func AddCommand(cmd *Command) {
-	DefaultCommander.AddCommand(cmd)
-}
-
-func GetCommand(name string) (*Command, bool) {
-	cmd, ok := DefaultCommander.GetCommand(name)
-	return cmd, ok
-}
-
-func (b *Bot) CommandHandler() func(*discordgo.Session, *discordgo.MessageCreate) {
-	return func(s *discordgo.Session, m *discordgo.MessageCreate) {
-		var cmd *Command
-
-		if m.Author.ID == s.State.User.ID {
-			return
-		}
-
-		if !lib.HasCommand(m.Content, b.Config.Prefix) {
-			return
-		}
-
-		cmdName, arg := lib.SplitCommandAndArg(m.Content, b.Config.Prefix)
-
-		cmd, ok := GetCommand(cmdName)
-
-		args := lib.SplitArgs(arg, cmd.NArgs)
-
-		if ok {
-			cmd.Config = b.Config
-
-			log.Debugf("command: %v, args: %v, nargs: %d", cmd.Name, args, len(args))
-			if err := cmd.Func(args, m); err != nil {
-				log.Errorf("failed to execute command: %s", err)
-			}
-
-			return
-		}
-
-		log.Warnf("unknown command: %v, args: %v, nargs: %d", cmdName, args, len(args))
-		s.ChannelMessageSend(m.ChannelID, fmt.Sprintf("unknown command: %s", cmdName))
-	}
-}

bot/config.go

@@ -1,37 +0,0 @@
-package bot
-
-const (
-	defaultPrefix = "!"
-)
-
-var (
-	defaultReactions []string = []string{"👍", "🌶️", "🤣", "😂", "🍆", "🍑", "❤️", "💦", "😍", "💩", "🔥", "🍒", "🎉", "🥳", "🎊"}
-)
-
-type (
-	Config struct {
-		Debug               bool          `mapstructure:"debug"`
-		Handler             HandlerConfig `mapstructure:"handler"`
-		Prefix              string        `mapstructure:"prefix"`
-		DiscordToken        string        `mapstructure:"discord_token"`
-		OpenWeatherMapToken string        `mapstructure:"open_weather_map_token"`
-	}
-
-	HandlerConfig struct {
-		Reaction ReactionConfig `mapstructure:"reaction"`
-	}
-
-	ReactionConfig struct {
-		Emojis   []string
-		Channels []string
-	}
-)
-
-func NewConfig() Config {
-	var c Config
-
-	c.Prefix = defaultPrefix
-	c.Handler.Reaction.Emojis = defaultReactions
-
-	return c
-}

bot/ping.go

@@ -1,12 +0,0 @@
-package bot
-
-import (
-	"github.com/bwmarrin/discordgo"
-)
-
-func (b *Bot) PingCommand() CommandFunc {
-	return func(args []string, m *discordgo.MessageCreate) error {
-		b.Session.ChannelMessageSend(m.ChannelID, "pong")
-		return nil
-	}
-}

bot/reaction.go

@@ -1,52 +0,0 @@
-package bot
-
-import (
-	"math/rand"
-	"strings"
-
-	"git.kill0.net/chill9/beepboop/lib"
-
-	"github.com/bwmarrin/discordgo"
-	log "github.com/sirupsen/logrus"
-)
-
-func (b *Bot) ReactionHandler() func(*discordgo.Session, *discordgo.MessageCreate) {
-	return func(s *discordgo.Session, m *discordgo.MessageCreate) {
-		if m.Author.ID == s.State.User.ID {
-			return
-		}
-
-		emojis := b.Config.Handler.Reaction.Emojis
-		channels := b.Config.Handler.Reaction.Channels
-
-		if len(emojis) == 0 {
-			log.Warning("emoji list is empty")
-			return
-		}
-
-		channel, err := s.Channel(m.ChannelID)
-		if err != nil {
-			log.Fatalf("unable to get channel name: %v", err)
-		}
-
-		if len(channels) > 0 && !lib.Contains(channels, channel.Name) {
-			return
-		}
-
-		for _, a := range m.Attachments {
-			if strings.HasPrefix(a.ContentType, "image/") {
-				for i := 1; i <= lib.RandInt(1, len(emojis)); i++ {
-					r := emojis[rand.Intn(len(emojis))]
-					s.MessageReactionAdd(m.ChannelID, m.ID, r)
-				}
-			}
-		}
-
-		for range m.Embeds {
-			for i := 1; i <= lib.RandInt(1, len(emojis)); i++ {
-				r := emojis[rand.Intn(len(emojis))]
-				s.MessageReactionAdd(m.ChannelID, m.ID, r)
-			}
-		}
-	}
-}

bot/time.go

@@ -1,36 +0,0 @@
-package bot
-
-import (
-	"fmt"
-	"time"
-
-	"github.com/bwmarrin/discordgo"
-	log "github.com/sirupsen/logrus"
-)
-
-func (b *Bot) TimeCommand() CommandFunc {
-	return func(args []string, m *discordgo.MessageCreate) error {
-		var (
-			t  time.Time
-			tz string
-		)
-
-		now := time.Now()
-
-		if len(args) == 1 {
-			tz = args[0]
-			loc, err := time.LoadLocation(tz)
-			if err != nil {
-				log.Warnf("failed to load location: %s", err)
-				b.Session.ChannelMessageSend(m.ChannelID, err.Error())
-				return nil
-			}
-			t = now.In(loc)
-		} else {
-			t = now
-		}
-
-		b.Session.ChannelMessageSend(m.ChannelID, fmt.Sprint(t))
-		return nil
-	}
-}

bot/version.go

@@ -1,25 +0,0 @@
-package bot
-
-import (
-	"fmt"
-	"runtime"
-
-	"github.com/bwmarrin/discordgo"
-)
-
-const (
-	SourceURI = "https://git.kill0.net/chill9/bb"
-)
-
-func (b *Bot) VersionCommand() CommandFunc {
-	return func(args []string, m *discordgo.MessageCreate) error {
-		b.Session.ChannelMessageSend(m.ChannelID, fmt.Sprintf(
-			"go version: %s\nplatform: %s\nos: %s\nsource: %s\n",
-			runtime.Version(),
-			runtime.GOARCH,
-			runtime.GOOS,
-			SourceURI,
-		))
-		return nil
-	}
-}

bot/weather.go

@@ -1,56 +0,0 @@
-package bot
-
-import (
-	"fmt"
-
-	"git.kill0.net/chill9/beepboop/lib/weather"
-
-	"github.com/bwmarrin/discordgo"
-	log "github.com/sirupsen/logrus"
-)
-
-func (b *Bot) WeatherCommand() CommandFunc {
-	return func(args []string, m *discordgo.MessageCreate) error {
-		var (
-			err error
-			loc string
-			w   weather.Weather
-		)
-
-		if len(args) != 1 {
-			b.Session.ChannelMessageSend(m.ChannelID, "help: `!weather <CITY>,<STATE>,<COUNTRY>`")
-			return nil
-		}
-
-		loc = args[0]
-
-		if b.Config.OpenWeatherMapToken == "" {
-			log.Error("OpenWeather token is not set")
-			return nil
-		}
-
-		wc := weather.NewClient(b.Config.OpenWeatherMapToken)
-
-		log.Debugf("weather requested for '%s'", loc)
-
-		w, err = wc.Get(loc)
-		if err != nil {
-			log.Errorf("weather client error: %v", err)
-			return nil
-		}
-
-		log.Debugf("weather returned for '%s': %+v", loc, w)
-
-		b.Session.ChannelMessageSend(m.ChannelID, fmt.Sprintf(
-			"%s (%.1f, %.1f) — C:%.1f F:%.1f K:%.1f",
-			loc,
-			w.Coord.Lat,
-			w.Coord.Lon,
-			w.Main.Temp.Celcius(),
-			w.Main.Temp.Fahrenheit(),
-			w.Main.Temp.Kelvin(),
-		))
-
-		return nil
-	}
-}

cmd/bb/main.go

@@ -1,13 +1,13 @@
 package main
 
 import (
-	"os"
-
 	"git.kill0.net/chill9/beepboop/bot"
+
+	log "github.com/sirupsen/logrus"
 )
 
 func main() {
 	if err := bot.Run(); err != nil {
-		os.Exit(1)
+		log.Fatal(err)
 	}
 }

command/coin.go

@@ -0,0 +1,29 @@
+package command
+
+import (
+	"git.kill0.net/chill9/beepboop/lib"
+	"github.com/bwmarrin/discordgo"
+)
+
+type Coin bool
+
+func (c *Coin) Flip() bool {
+	*c = Coin(lib.Itob(lib.RandInt(0, 1)))
+	return bool(*c)
+}
+
+func (h *Handlers) Coin(args []string, s *discordgo.Session, m *discordgo.MessageCreate) error {
+	var (
+		c   Coin
+		msg string
+	)
+
+	if c.Flip() {
+		msg = "heads"
+	} else {
+		msg = "tails"
+	}
+
+	s.ChannelMessageSend(m.ChannelID, msg)
+	return nil
+}

command/commands.go

@@ -0,0 +1,11 @@
+package command
+
+import "git.kill0.net/chill9/beepboop/config"
+
+type Handlers struct {
+	config *config.Config
+}
+
+func NewHandlers(config *config.Config) *Handlers {
+	return &Handlers{config: config}
+}

command/deal.go

@@ -1,4 +1,4 @@
-package bot
+package command
 
 import (
 	"errors"
@@ -45,8 +45,7 @@ func (d *Deck) Deal(n int) ([]Card, error) {
 	return hand, err
 }
 
-func (b *Bot) DealCommand() CommandFunc {
-	return func(args []string, m *discordgo.MessageCreate) error {
+func (h *Handlers) Deal(args []string, s *discordgo.Session, m *discordgo.MessageCreate) error {
 	rand.Shuffle(len(deck), func(i, j int) {
 		deck[i], deck[j] = deck[j], deck[i]
 	})
@@ -54,7 +53,7 @@ func (b *Bot) DealCommand() CommandFunc {
 	log.Debugf("%+v", deck)
 
 	if len(args) != 1 {
-			b.Session.ChannelMessageSend(m.ChannelID, "help: `!deal <n>`")
+		s.ChannelMessageSend(m.ChannelID, "help: `!deal <n>`")
 		return nil
 	}
 
@@ -65,13 +64,12 @@ func (b *Bot) DealCommand() CommandFunc {
 
 	hand, err := deck.Deal(n)
 	if err != nil {
-			b.Session.ChannelMessageSend(m.ChannelID, fmt.Sprintf("error: %s\n", err))
+		s.ChannelMessageSend(m.ChannelID, fmt.Sprintf("error: %s\n", err))
 		return nil
 	}
 
-		b.Session.ChannelMessageSend(m.ChannelID, JoinCards(hand, " "))
+	s.ChannelMessageSend(m.ChannelID, JoinCards(hand, " "))
 	return nil
-	}
 }
 
 func JoinCards(h []Card, sep string) string {

command/dice.go

@@ -1,4 +1,4 @@
-package bot
+package command
 
 import (
 	"errors"
@@ -78,8 +78,7 @@ func (r *Roll) RollDice() {
 	}
 }
 
-func (b *Bot) RollCommand() CommandFunc {
-	return func(args []string, m *discordgo.MessageCreate) error {
+func (h *Handlers) Roll(args []string, s *discordgo.Session, m *discordgo.MessageCreate) error {
 	var (
 		err       error
 		msg, roll string
@@ -90,7 +89,7 @@ func (b *Bot) RollCommand() CommandFunc {
 
 	r, err = ParseRoll(roll)
 	if err != nil {
-			b.Session.ChannelMessageSend(m.ChannelID, err.Error())
+		s.ChannelMessageSend(m.ChannelID, err.Error())
 		return nil
 	}
 
@@ -99,7 +98,6 @@ func (b *Bot) RollCommand() CommandFunc {
 
 	msg = fmt.Sprintf("🎲 %s = %d", lib.JoinInt(r.Rolls, " + "), r.Sum)
 
-		b.Session.ChannelMessageSend(m.ChannelID, msg)
+	s.ChannelMessageSend(m.ChannelID, msg)
 	return nil
-	}
 }

command/ping.go

@@ -0,0 +1,10 @@
+package command
+
+import (
+	"github.com/bwmarrin/discordgo"
+)
+
+func (h *Handlers) Ping(args []string, s *discordgo.Session, m *discordgo.MessageCreate) error {
+	s.ChannelMessageSend(m.ChannelID, "pong")
+	return nil
+}

command/roulette.go

@@ -1,4 +1,4 @@
-package bot
+package command
 
 import (
 	"git.kill0.net/chill9/beepboop/lib"
@@ -66,8 +66,7 @@ func (g *Gun) IsEmpty() bool {
 	return true
 }
 
-func (b *Bot) RouletteCommand() CommandFunc {
-	return func(args []string, m *discordgo.MessageCreate) error {
+func (h *Handlers) Roulette(args []string, s *discordgo.Session, m *discordgo.MessageCreate) error {
 	if gun.IsEmpty() {
 		gun.Load(Bullets)
 		log.Debugf("reloading gun: %+v\n", gun)
@@ -75,10 +74,9 @@ func (b *Bot) RouletteCommand() CommandFunc {
 
 	log.Debugf("firing gun: %+v\n", gun)
 	if gun.Fire() {
-			b.Session.ChannelMessageSend(m.ChannelID, GunFireMessage)
+		s.ChannelMessageSend(m.ChannelID, GunFireMessage)
 	} else {
-			b.Session.ChannelMessageSend(m.ChannelID, GunClickMessage)
+		s.ChannelMessageSend(m.ChannelID, GunClickMessage)
 	}
 	return nil
-	}
 }

command/rps.go

@@ -0,0 +1,34 @@
+package command
+
+import (
+	"strings"
+
+	"git.kill0.net/chill9/beepboop/lib/rps"
+	"github.com/bwmarrin/discordgo"
+)
+
+func (h *Handlers) Rps(args []string, s *discordgo.Session, m *discordgo.MessageCreate) error {
+	if len(args) != 1 {
+		s.ChannelMessageSend(
+			m.ChannelID, "help: `!rps (rock | paper | scissors)`",
+		)
+		return nil
+	}
+
+	pc := strings.ToLower(args[0]) // player's choice
+
+	g := rps.NewGame(rps.RulesRps, rps.EmojiMapRps)
+
+	bc := g.Rand() // bot's choice
+
+	out, err := g.Play(bc, pc)
+	if _, ok := err.(rps.InvalidChoiceError); ok {
+		s.ChannelMessageSend(
+			m.ChannelID, "help: `!rps (rock | paper | scissors)`",
+		)
+	}
+
+	s.ChannelMessageSend(m.ChannelID, out)
+
+	return nil
+}

command/rpsls.go

@@ -0,0 +1,34 @@
+package command
+
+import (
+	"strings"
+
+	"git.kill0.net/chill9/beepboop/lib/rps"
+	"github.com/bwmarrin/discordgo"
+)
+
+func (h *Handlers) Rpsls(args []string, s *discordgo.Session, m *discordgo.MessageCreate) error {
+	if len(args) != 1 {
+		s.ChannelMessageSend(
+			m.ChannelID, "help: `!rps (rock | paper | scissors | lizard | spock)`",
+		)
+		return nil
+	}
+
+	pc := strings.ToLower(args[0]) // player's choice
+
+	g := rps.NewGame(rps.RulesRpsls, rps.EmojiMapRpsls)
+
+	bc := g.Rand() // bot's choice
+
+	out, err := g.Play(bc, pc)
+	if _, ok := err.(rps.InvalidChoiceError); ok {
+		s.ChannelMessageSend(
+			m.ChannelID, "help: `!rps (rock | paper | scissors | lizard | spock)`",
+		)
+	}
+
+	s.ChannelMessageSend(m.ChannelID, out)
+
+	return nil
+}

command/time.go

@@ -0,0 +1,34 @@
+package command
+
+import (
+	"fmt"
+	"time"
+
+	"github.com/bwmarrin/discordgo"
+	log "github.com/sirupsen/logrus"
+)
+
+func (h *Handlers) Time(args []string, s *discordgo.Session, m *discordgo.MessageCreate) error {
+	var (
+		t  time.Time
+		tz string
+	)
+
+	now := time.Now()
+
+	if len(args) == 1 {
+		tz = args[0]
+		loc, err := time.LoadLocation(tz)
+		if err != nil {
+			log.Warnf("failed to load location: %s", err)
+			s.ChannelMessageSend(m.ChannelID, err.Error())
+			return nil
+		}
+		t = now.In(loc)
+	} else {
+		t = now
+	}
+
+	s.ChannelMessageSend(m.ChannelID, fmt.Sprint(t))
+	return nil
+}

command/version.go

@@ -0,0 +1,23 @@
+package command
+
+import (
+	"fmt"
+	"runtime"
+
+	"github.com/bwmarrin/discordgo"
+)
+
+const (
+	SourceURI = "https://git.kill0.net/chill9/bb"
+)
+
+func (h *Handlers) Version(args []string, s *discordgo.Session, m *discordgo.MessageCreate) error {
+	s.ChannelMessageSend(m.ChannelID, fmt.Sprintf(
+		"go version: %s\nplatform: %s\nos: %s\nsource: %s\n",
+		runtime.Version(),
+		runtime.GOARCH,
+		runtime.GOOS,
+		SourceURI,
+	))
+	return nil
+}

command/weather.go

@@ -0,0 +1,54 @@
+package command
+
+import (
+	"fmt"
+
+	"git.kill0.net/chill9/beepboop/lib/weather"
+
+	"github.com/bwmarrin/discordgo"
+	log "github.com/sirupsen/logrus"
+)
+
+func (h *Handlers) Weather(args []string, s *discordgo.Session, m *discordgo.MessageCreate) error {
+	var (
+		err error
+		loc string
+		w   weather.Weather
+	)
+
+	if len(args) != 1 {
+		s.ChannelMessageSend(m.ChannelID, "help: `!weather <CITY>,<STATE>,<COUNTRY>`")
+		return nil
+	}
+
+	loc = args[0]
+
+	if h.config.OpenWeatherMapToken == "" {
+		log.Error("OpenWeather token is not set")
+		return nil
+	}
+
+	wc := weather.NewClient(h.config.OpenWeatherMapToken)
+
+	log.Debugf("weather requested for '%s'", loc)
+
+	w, err = wc.Get(loc)
+	if err != nil {
+		log.Errorf("weather client error: %v", err)
+		return nil
+	}
+
+	log.Debugf("weather returned for '%s': %+v", loc, w)
+
+	s.ChannelMessageSend(m.ChannelID, fmt.Sprintf(
+		"%s (%.1f, %.1f) — C:%.1f F:%.1f K:%.1f",
+		loc,
+		w.Coord.Lat,
+		w.Coord.Lon,
+		w.Main.Temp.Celcius(),
+		w.Main.Temp.Fahrenheit(),
+		w.Main.Temp.Kelvin(),
+	))
+
+	return nil
+}

config/config.go

@@ -0,0 +1,58 @@
+package config
+
+const (
+	defaultPrefix = "!"
+)
+
+var (
+	defaultReactions []string = []string{
+		"👍", "🌶️", "🤣", "😂", "🍆", "🍑", "❤️", "💦", "😍", "💩",
+		"🔥", "🍒", "🎉", "🥳", "🎊", "📉", "📈", "💀", "☠️",
+	}
+)
+
+type (
+	Config struct {
+		Debug               bool           `mapstructure:"debug"`
+		Handler             HandlerConfig  `mapstructure:"handler"`
+		Prefix              string         `mapstructure:"prefix"`
+		DiscordToken        string         `mapstructure:"discord_token"`
+		OpenWeatherMapToken string         `mapstructure:"open_weather_map_token"`
+		Mongo               MongoConfig    `mapstructure:"mongo"`
+		Redis               RedisConfig    `mapstructure:"redis"`
+		Postgres            PostgresConfig `mapstructure:"postgres"`
+	}
+
+	HandlerConfig struct {
+		Reaction ReactionConfig `mapstructure:"reaction"`
+	}
+
+	ReactionConfig struct {
+		Emojis   []string
+		Channels []string
+	}
+
+	MongoConfig struct {
+		Uri      string `mapstructure:"uri"`
+		Database string `mapstructure:"database"`
+	}
+
+	RedisConfig struct {
+		Addr     string `mapstructure:"addr"`
+		Password string `mapstructure:"password"`
+		DB       int    `mapstructure:"database"`
+	}
+
+	PostgresConfig struct {
+		Uri string `mapstructure:"uri"`
+	}
+)
+
+func NewConfig() *Config {
+	var c *Config = &Config{}
+
+	c.Prefix = defaultPrefix
+	c.Handler.Reaction.Emojis = defaultReactions
+
+	return c
+}

handler/handlers.go

@@ -0,0 +1,15 @@
+package handler
+
+import (
+	"git.kill0.net/chill9/beepboop/config"
+)
+
+type Handlers struct {
+	config *config.Config
+}
+
+func NewHandlers(config *config.Config) *Handlers {
+	return &Handlers{
+		config: config,
+	}
+}

handler/reaction.go

@@ -0,0 +1,50 @@
+package handler
+
+import (
+	"math/rand"
+	"strings"
+
+	"git.kill0.net/chill9/beepboop/lib"
+
+	"github.com/bwmarrin/discordgo"
+	log "github.com/sirupsen/logrus"
+)
+
+func (h *Handlers) Reaction(s *discordgo.Session, m *discordgo.MessageCreate) {
+	if m.Author.ID == s.State.User.ID {
+		return
+	}
+
+	emojis := h.config.Handler.Reaction.Emojis
+	channels := h.config.Handler.Reaction.Channels
+
+	if len(emojis) == 0 {
+		log.Warning("emoji list is empty")
+		return
+	}
+
+	channel, err := s.Channel(m.ChannelID)
+	if err != nil {
+		log.Fatalf("unable to get channel name: %v", err)
+	}
+
+	if len(channels) > 0 && !lib.Contains(channels, channel.Name) {
+		return
+	}
+
+	for _, a := range m.Attachments {
+		if strings.HasPrefix(a.ContentType, "image/") {
+			for i := 1; i <= lib.RandInt(1, len(emojis)); i++ {
+				r := emojis[rand.Intn(len(emojis))]
+				s.MessageReactionAdd(m.ChannelID, m.ID, r)
+			}
+		}
+	}
+
+	for range m.Embeds {
+		for i := 1; i <= lib.RandInt(1, len(emojis)); i++ {
+			r := emojis[rand.Intn(len(emojis))]
+			s.MessageReactionAdd(m.ChannelID, m.ID, r)
+		}
+	}
+}

lib/common.go

@@ -118,6 +118,10 @@ func SplitCommandAndArg(s, prefix string) (cmd string, arg string) {
 func SplitCommandAndArgs(s, prefix string, n int) (cmd string, args []string) {
 	cmd, arg := SplitCommandAndArg(s, prefix)
 
+	if arg == "" {
+		return cmd, []string{}
+	}
+
 	if n == 0 {
 		return cmd, strings.Split(arg, " ")
 	}
@@ -126,6 +130,10 @@ func SplitCommandAndArgs(s, prefix string, n int) (cmd string, args []string) {
 }
 
 func SplitArgs(s string, n int) (args []string) {
+	if s == "" {
+		return []string{}
+	}
+
 	if n > 0 {
 		args = strings.SplitN(s, " ", n)
 	} else {
@@ -133,3 +141,21 @@ func SplitArgs(s string, n int) (args []string) {
 	}
 	return
 }
+
+func MapKeys[K comparable, V any](m map[K]V) []K {
+	keys := make([]K, 0, len(m))
+	for k := range m {
+		keys = append(keys, k)
+	}
+	return keys
+}
+
+func MapKey[K comparable, V comparable](m map[K]V, v V) K {
+	var r K
+	for k := range m {
+		if m[k] == v {
+			return k
+		}
+	}
+	return r
+}

lib/common_test.go

@@ -90,8 +90,8 @@ func TestSplitCommandAndArgs(t *testing.T) {
 	}{
 		{"!command x y", "!", 2, "command", []string{"x", "y"}},
 		{"!command x y z", "!", 2, "command", []string{"x", "y z"}},
-		{"!command", "!", 1, "command", []string{""}},
-		{"hey man", "!", 1, "", []string{""}},
+		{"!command", "!", 1, "command", []string{}},
+		{"hey man", "!", 1, "", []string{}},
 	}
 	for _, table := range tables {
 		gotCmd, gotArgs := SplitCommandAndArgs(table.s, table.prefix, table.n)
@@ -99,7 +99,7 @@ func TestSplitCommandAndArgs(t *testing.T) {
 			t.Errorf("got: %s, want: %s", gotCmd, table.wantCmd)
 		}
 		if !reflect.DeepEqual(gotArgs, table.wantArgs) {
-			t.Errorf("got: %+v, want: %+v", gotArgs, table.wantArgs)
+			t.Errorf("got: %#v, want: %#v", gotArgs, table.wantArgs)
 		}
 	}
 }
@@ -115,6 +115,7 @@ func TestSplitArgs(t *testing.T) {
 		{"a b c", 2, []string{"a", "b c"}},
 		{"a b c", 3, []string{"a", "b", "c"}},
 		{"a b c", 4, []string{"a", "b", "c"}},
+		{"", 0, []string{}},
 	}
 	for _, table := range tables {
 		if got, want := SplitArgs(table.s, table.n), table.want; !reflect.DeepEqual(got, want) {
@@ -122,3 +123,37 @@ func TestSplitArgs(t *testing.T) {
 		}
 	}
 }
+
+func TestMapKeys(t *testing.T) {
+	tables := []struct {
+		m    map[string]int
+		want []string
+	}{
+		{map[string]int{"a": 0, "b": 1, "c": 3}, []string{"a", "b", "c"}},
+	}
+
+	for _, table := range tables {
+		if got, want := MapKeys(table.m), table.want; !reflect.DeepEqual(got, want) {
+			t.Errorf("got: %#v, want: %#v", got, want)
+		}
+	}
+}
+
+func TestMapKey(t *testing.T) {
+	tables := []struct {
+		m    map[string]int
+		n    int
+		want string
+	}{
+		{map[string]int{"a": 0, "b": 1, "c": 2}, 0, "a"},
+		{map[string]int{"a": 0, "b": 1, "c": 2}, 1, "b"},
+		{map[string]int{"a": 0, "b": 1, "c": 2}, 2, "c"},
+		{map[string]int{"a": 0, "b": 1, "c": 2, "d": 0}, 0, "a"},
+	}
+
+	for _, table := range tables {
+		if got, want := MapKey(table.m, table.n), table.want; got != want {
+			t.Errorf("got: %#v, want: %#v", got, want)
+		}
+	}
+}

lib/rand.go

@@ -37,3 +37,21 @@ func SeedMathRand() error {
 func RandInt(min int, max int) int {
 	return rand.Intn(max-min+1) + min
 }
+
+func MapRand[K comparable, V any](m map[K]V) V {
+	n := rand.Intn(len(m))
+	i := 0
+	for _, v := range m {
+		if i == n {
+			return v
+		}
+		i++
+	}
+	panic("unreachable")
+}
+
+func MapRandKey[K comparable, V any](m map[K]V) K {
+	keys := MapKeys(m)
+	n := rand.Intn(len(m))
+	return keys[n]
+}

lib/rps/rps.go

@@ -0,0 +1,118 @@
+package rps
+
+import (
+	"fmt"
+	"strings"
+
+	"git.kill0.net/chill9/beepboop/lib"
+)
+
+type (
+	Game struct {
+		rules    [][]string
+		emojiMap map[string]string
+	}
+)
+
+type InvalidChoiceError struct {
+	s string
+}
+
+func (e InvalidChoiceError) Error() string {
+	return fmt.Sprintf("%q is an invalid choice", e.s)
+}
+
+var (
+	RulesRps [][]string = [][]string{
+		{"rock", "scissors", "crushes"},
+		{"paper", "rock", "covers"},
+		{"scissors", "paper", "cuts"},
+	}
+
+	EmojiMapRps map[string]string = map[string]string{
+		"rock":     "🪨️",
+		"paper":    "📝",
+		"scissors": "✂️",
+	}
+
+	RulesRpsls [][]string = [][]string{
+		{"rock", "scissors", "crushes"},
+		{"rock", "lizard", "crushes"},
+		{"paper", "rock", "covers"},
+		{"paper", "spock", "disproves"},
+		{"scissors", "paper", "cuts"},
+		{"scissors", "lizard", "decapitates"},
+		{"lizard", "paper", "eats"},
+		{"lizard", "spock", "poisons"},
+		{"spock", "scissors", "smashes"},
+		{"spock", "rock", "vaporizes"},
+	}
+
+	EmojiMapRpsls map[string]string = map[string]string{
+		"rock":     "🪨️",
+		"paper":    "📝",
+		"scissors": "✂️",
+		"lizard":   "🦎",
+		"spock":    "🖖",
+	}
+)
+
+func NewGame(rules [][]string, emojiMap map[string]string) *Game {
+	return &Game{rules: rules, emojiMap: emojiMap}
+}
+
+func (g *Game) Rand() string {
+	return lib.MapRandKey(g.emojiMap)
+}
+
+func (g *Game) Play(c1, c2 string) (string, error) {
+	var b strings.Builder
+
+	if !g.Valid(c1) {
+		return "", InvalidChoiceError{s: c1}
+	}
+	if !g.Valid(c2) {
+		return "", InvalidChoiceError{s: c2}
+	}
+
+	fmt.Fprintf(&b, "%s v %s: ", g.emojiMap[c1], g.emojiMap[c2])
+
+	for _, rule := range g.rules {
+		verb := rule[2]
+
+		if c1 == c2 {
+			fmt.Fprintf(&b, "draw")
+			return b.String(), nil
+		}
+
+		if c1 == rule[0] && c2 == rule[1] {
+			fmt.Fprintf(&b, "%s %s %s", c1, verb, c2)
+			return b.String(), nil
+		} else if c2 == rule[0] && c1 == rule[1] {
+			fmt.Fprintf(&b, "%s %s %s", c2, verb, c1)
+			return b.String(), nil
+		}
+	}
+
+	return b.String(), nil
+}
+
+func (g *Game) Valid(c string) bool {
+	_, ok := g.emojiMap[c]
+	return ok
+}
+
+func Play(rules [][]string, c1, c2 string) string {
+	for _, rule := range rules {
+		if c1 == c2 {
+			return "draw"
+		}
+
+		if c1 == rule[0] && c2 == rule[1] {
+			return fmt.Sprintf("%s %s %s", c1, rule[2], c2)
+		} else if c2 == rule[0] && c1 == rule[1] {
+			return fmt.Sprintf("%s %s %s", c2, rule[2], c1)
+		}
+	}
+	return ""
+}

lib/weather/structs.go

@@ -22,6 +22,12 @@ type (
 			H1 float32 `json:"1h"`
 			H3 float32 `json:"3h"`
 		} `json:"rain"`
+
+		Weather []struct {
+			Main        string `json:"main"`
+			Description string `json:"description"`
+			Icon        string `json:"icon"`
+		} `json:"weather"`
 	}
 
 	WeatherError struct {