mirror of https://github.com/velour/catbase.git
131 lines
3.2 KiB
Go
131 lines
3.2 KiB
Go
// © 2013 the CatBase Authors under the WTFPL. See AUTHORS for the list of authors.
|
|
|
|
package picker
|
|
|
|
import (
|
|
"errors"
|
|
"regexp"
|
|
"strconv"
|
|
"strings"
|
|
|
|
"fmt"
|
|
"math/rand"
|
|
|
|
"github.com/velour/catbase/bot"
|
|
"github.com/velour/catbase/bot/msg"
|
|
)
|
|
|
|
type PickerPlugin struct {
|
|
Bot bot.Bot
|
|
}
|
|
|
|
// NewPickerPlugin creates a new PickerPlugin with the Plugin interface
|
|
func New(bot bot.Bot) *PickerPlugin {
|
|
return &PickerPlugin{
|
|
Bot: bot,
|
|
}
|
|
}
|
|
|
|
// Message responds to the bot hook on recieving messages.
|
|
// This function returns true if the plugin responds in a meaningful way to the users message.
|
|
// Otherwise, the function returns false and the bot continues execution of other plugins.
|
|
func (p *PickerPlugin) Message(message msg.Message) bool {
|
|
if !strings.HasPrefix(message.Body, "pick") {
|
|
return false
|
|
}
|
|
|
|
n, items, err := p.parse(message.Body)
|
|
if err != nil {
|
|
p.Bot.SendMessage(message.Channel, err.Error())
|
|
return true
|
|
}
|
|
|
|
if n == 1 {
|
|
item := items[rand.Intn(len(items))]
|
|
out := fmt.Sprintf("I've chosen %q for you.", strings.TrimSpace(item))
|
|
p.Bot.SendMessage(message.Channel, out)
|
|
return true
|
|
}
|
|
|
|
rand.Shuffle(len(items), func(i, j int) {
|
|
items[i], items[j] = items[j], items[i]
|
|
})
|
|
items = items[:n]
|
|
|
|
var b strings.Builder
|
|
b.WriteString("I've chosen these hot picks for you: { ")
|
|
fmt.Fprintf(&b, "%q", items[0])
|
|
for _, item := range items[1:] {
|
|
fmt.Fprintf(&b, ", %q", item)
|
|
}
|
|
b.WriteString(" }")
|
|
p.Bot.SendMessage(message.Channel, b.String())
|
|
return true
|
|
}
|
|
|
|
var pickerListPrologue = regexp.MustCompile(`^pick[ \t]+([0-9]*)[ \t]*\{[ \t]*`)
|
|
var pickerListItem = regexp.MustCompile(`^([^,]+),[ \t]*`)
|
|
var pickerListFinalItem = regexp.MustCompile(`^([^,}]+),?[ \t]*\}[ \t]*`)
|
|
|
|
func (p *PickerPlugin) parse(body string) (int, []string, error) {
|
|
subs := pickerListPrologue.FindStringSubmatch(body)
|
|
if subs == nil {
|
|
return 0, nil, errors.New("saddle up for a syntax error")
|
|
}
|
|
|
|
n := 1
|
|
var err error
|
|
if subs[1] != "" {
|
|
n, err = strconv.Atoi(subs[1])
|
|
if err != nil {
|
|
return 0, nil, err
|
|
}
|
|
}
|
|
|
|
var items []string
|
|
rest := body[len(subs[0]):]
|
|
for {
|
|
subs = pickerListItem.FindStringSubmatch(rest)
|
|
if subs == nil {
|
|
break
|
|
}
|
|
|
|
items = append(items, subs[1])
|
|
rest = rest[len(subs[0]):]
|
|
}
|
|
|
|
subs = pickerListFinalItem.FindStringSubmatch(rest)
|
|
if subs == nil {
|
|
return 0, nil, errors.New("lasso yerself that final curly brace, compadre")
|
|
}
|
|
items = append(items, subs[1])
|
|
|
|
if n < 1 || n > len(items) {
|
|
return 0, nil, errors.New("whoah there, bucko, I can't create something out of nothing")
|
|
}
|
|
|
|
return n, items, nil
|
|
}
|
|
|
|
// Help responds to help requests. Every plugin must implement a help function.
|
|
func (p *PickerPlugin) Help(channel string, parts []string) {
|
|
p.Bot.SendMessage(channel, "Choose from a list of options. Try \"pick {a,b,c}\".")
|
|
}
|
|
|
|
// Empty event handler because this plugin does not do anything on event recv
|
|
func (p *PickerPlugin) Event(kind string, message msg.Message) bool {
|
|
return false
|
|
}
|
|
|
|
// Handler for bot's own messages
|
|
func (p *PickerPlugin) BotMessage(message msg.Message) bool {
|
|
return false
|
|
}
|
|
|
|
// Register any web URLs desired
|
|
func (p *PickerPlugin) RegisterWeb() *string {
|
|
return nil
|
|
}
|
|
|
|
func (p *PickerPlugin) ReplyMessage(message msg.Message, identifier string) bool { return false }
|