Implement slash commands for playback control

internal/commands/nowplaying.go

@@ -0,0 +1,37 @@
+package commands
+
+import (
+	"context"
+	"fmt"
+
+	"github.com/disgoorg/disgo/discord"
+	"github.com/disgoorg/disgo/events"
+)
+
+type NowPlayingCommand struct {
+	deps *Dependencies
+}
+
+func NewNowPlayingCommand(deps *Dependencies) *NowPlayingCommand {
+	return &NowPlayingCommand{deps: deps}
+}
+
+func (c *NowPlayingCommand) Definition() discord.ApplicationCommandCreate {
+	return discord.SlashCommandCreate{
+		Name:        "nowplaying",
+		Description: "Shows the currently playing track",
+	}
+}
+
+func (c *NowPlayingCommand) Execute(ctx context.Context, event *events.ApplicationCommandInteractionCreate) error {
+	gid, ok := guildID(event)
+	if !ok {
+		return guildOnlyError(event)
+	}
+
+	track, playing := c.deps.Music.Guild(gid).NowPlaying()
+	if !playing {
+		return reply(event, "Nothing is playing right now.")
+	}
+	return reply(event, fmt.Sprintf("Now playing: **%s** (%s)", track.Info.Title, track.Info.Length))
+}