Implement slash commands for playback control

internal/commands/stop.go

@@ -0,0 +1,40 @@
+package commands
+
+import (
+	"context"
+
+	"github.com/disgoorg/disgo/discord"
+	"github.com/disgoorg/disgo/events"
+)
+
+type StopCommand struct {
+	deps *Dependencies
+}
+
+func NewStopCommand(deps *Dependencies) *StopCommand {
+	return &StopCommand{deps: deps}
+}
+
+func (c *StopCommand) Definition() discord.ApplicationCommandCreate {
+	return discord.SlashCommandCreate{
+		Name:        "stop",
+		Description: "Stops playback, clears the queue and leaves the voice channel",
+	}
+}
+
+func (c *StopCommand) Execute(ctx context.Context, event *events.ApplicationCommandInteractionCreate) error {
+	gid, err := requirePlaybackAccess(c.deps.Discord, event)
+	if err != nil {
+		return err
+	}
+
+	if err := c.deps.Music.Guild(gid).Stop(ctx); err != nil {
+		return replyWithError(event, "Could not stop playback.", err)
+	}
+
+	if err := c.deps.Discord.UpdateVoiceState(ctx, gid, nil, false, false); err != nil {
+		return replyWithError(event, "Stopped playback, but could not leave the voice channel.", err)
+	}
+
+	return reply(event, "Stopped playback and left the voice channel.")
+}