Implement slash commands for playback control

internal/commands/volume.go

@@ -0,0 +1,47 @@
+package commands
+
+import (
+	"context"
+	"fmt"
+
+	"github.com/disgoorg/disgo/discord"
+	"github.com/disgoorg/disgo/events"
+)
+
+type VolumeCommand struct {
+	deps *Dependencies
+}
+
+func NewVolumeCommand(deps *Dependencies) *VolumeCommand {
+	return &VolumeCommand{deps: deps}
+}
+
+func (c *VolumeCommand) Definition() discord.ApplicationCommandCreate {
+	return discord.SlashCommandCreate{
+		Name:        "volume",
+		Description: "Sets the playback volume",
+		Options: []discord.ApplicationCommandOption{
+			discord.ApplicationCommandOptionInt{
+				Name:        "level",
+				Description: "Volume percentage, 0-200 (default 100)",
+				Required:    true,
+				MinValue:    intPtr(0),
+				MaxValue:    intPtr(200),
+			},
+		},
+	}
+}
+
+func (c *VolumeCommand) Execute(ctx context.Context, event *events.ApplicationCommandInteractionCreate) error {
+	gid, err := requirePlaybackAccess(c.deps.Discord, event)
+	if err != nil {
+		return err
+	}
+
+	level := event.SlashCommandInteractionData().Int("level")
+
+	if err := c.deps.Music.Guild(gid).SetVolume(ctx, level); err != nil {
+		return replyWithError(event, "Could not change the volume.", err)
+	}
+	return reply(event, fmt.Sprintf("Volume set to **%d%%**.", level))
+}