mirror of https://github.com/velour/catbase.git
113 lines
2.7 KiB
Go
113 lines
2.7 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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"github.com/rs/zerolog/log"
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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(c bot.Connector, 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(c, 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(c, 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(c, bot.Message, message.Channel, b.String())
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return true
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}
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var pickRegex = regexp.MustCompile(`^pick([^\s]+)?(\s\d)?\s+{(.*)}$`)
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func (p *PickerPlugin) parse(body string) (int, []string, error) {
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subs := pickRegex.FindStringSubmatch(body)
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log.Debug().Str("body", body).Strs("subs", subs).Msg("parse")
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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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log.Debug().
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Str("body", body).
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Interface("subs", subs).
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Msg("subs")
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delim := ","
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if subs[1] != "" {
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delim = subs[1]
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}
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n := 1
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var err error
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if num := strings.TrimSpace(subs[2]); num != "" {
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n, err = strconv.Atoi(num)
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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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items := strings.Split(subs[3], delim)
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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(c bot.Connector, kind bot.Kind, message msg.Message, args ...interface{}) bool {
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p.bot.Send(c, 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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