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bot.go
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bot.go
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package df
import (
"strings"
"log"
"os"
"github.com/bwmarrin/discordgo"
)
// Bot Root object for handling commands.
type Bot struct {
*discordgo.Session
prefix string
commandMap map[string]Command
}
// NewBotFromEnv Construct a bot from environment variables: token, prefix
func NewBotFromEnv() (*Bot, error) {
token := os.Getenv("testtoken")
pre := "." // get from env
sess, err := discordgo.New("Bot " + token)
sess.Open()
if err != nil {
return nil, err
}
b := &Bot{
Session: sess,
prefix: pre,
commandMap: make(map[string]Command),
}
b.AddRawHandler(func(s *discordgo.Session, m *discordgo.MessageCreate){
b.HandleCommand(m.Message)
})
return b, nil
}
func (b *Bot) RegisterCommand(cmd Command) {
b.commandMap[cmd.Name()] = cmd
}
func (b *Bot) AddRawHandler(handler interface{}) {
b.Session.AddHandler(handler)
}
func (b *Bot) HandleCommand(msg *discordgo.Message) {
tokens := strings.Split(msg.Content, " ")
cmdName, validCommand := b.isCommand(tokens[0])
if !validCommand {
return
}
ctx := &MessageContext{
Msg: msg,
Session: b.Session,
}
if len(tokens) > 1 {
ctx.Args = tokens[1:]
}
cmd := b.commandMap[cmdName]
if !cmd.PreFlight(ctx) {
return
}
e := cmd.Handle(ctx)
if e != nil {
log.Printf("[HandleCommand] %s\n", e)
}
}
func (b *Bot) isCommand(s string) (string, bool) {
if len(s) == 1 {
return "", false
}
if strings.HasPrefix(s, b.prefix) {
if _, ok := b.commandMap[s[1:]]; ok {
return s[1:], true
}
}
return "", false
}