Initial commit.

lib/discord/dispatcher.go

@@ -0,0 +1,68 @@
+package discord
+
+// Dispatcher is designed specifically to ease handling of text commands
+// of the form "/command options"
+// For other event types, you'll need the full Discord session,
+// exported as the variable `Session`.
+
+import (
+	"fmt"
+	"strings"
+
+	"github.com/bwmarrin/discordgo"
+)
+
+type DiscordMessage func(*discordgo.Session, *discordgo.MessageCreate)
+
+var handlers map[string]DiscordMessage
+var helpHandlers map[string]DiscordMessage
+
+// TODO: is this load-order dependent?
+func init() {
+	handlers = make(map[string]DiscordMessage)
+	helpHandlers = make(map[string]DiscordMessage)
+	handlers["/help"] = helpDispatcher
+}
+
+func RegisterHandler(command string, handler DiscordMessage, helpHandler DiscordMessage) {
+	handlers[command] = handler
+	helpHandlers[command[1:]] = helpHandler
+}
+
+func dispatcher(session *discordgo.Session, msg *discordgo.MessageCreate) {
+	command := strings.Split(msg.Content, " ")[0]
+
+	if msg.Author.ID == session.State.User.ID {
+		return
+	}
+
+	if handler, ok := handlers[command]; ok {
+		handler(session, msg)
+	}
+}
+
+func helpDispatcher(session *discordgo.Session, msg *discordgo.MessageCreate) {
+	data := strings.Split(msg.Content, " ")[1:]
+
+	if len(data) == 0 {
+		printCommandList(session, msg)
+		return
+	}
+
+	command := data[0]
+	if handler, ok := helpHandlers[command]; ok {
+		handler(session, msg)
+	}
+}
+
+func printCommandList(session *discordgo.Session, msg *discordgo.MessageCreate) {
+	var output strings.Builder
+
+	output.WriteString("Here are all the commands I know about:\n\n")
+	for command, _ := range helpHandlers {
+		output.WriteString(fmt.Sprintf("     %s\n", command))
+	}
+	output.WriteString("\nType `/help <command>` For more information about a particular command.")
+
+	session.ChannelMessageSend(msg.ChannelID, output.String())
+}

lib/discord/server.go

@@ -0,0 +1,39 @@
+// Discord bot infrastructure.
+
+package discord
+
+import (
+	"log"
+	"os"
+	"os/signal"
+	"syscall"
+
+	"github.com/bwmarrin/discordgo"
+)
+
+func InitServer(auth_token string) *discordgo.Session {
+	session, err := discordgo.New("Bot " + auth_token)
+
+	if err != nil {
+		log.Fatal(err.Error())
+	}
+
+	defer session.Close()
+
+	// Register handler
+	session.AddHandler(dispatcher)
+
+	err = session.Open()
+	if err != nil {
+		log.Fatal(err.Error())
+	}
+
+	return session
+}
+
+func RunServer() {
+	log.Println("Bot is now running. Press CTRL-C to exit.")
+	sig_chan := make(chan os.Signal, 1)
+	signal.Notify(sig_chan, syscall.SIGINT, syscall.SIGTERM, os.Interrupt, os.Kill)
+	<-sig_chan
+}