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