Implement slash commands for playback control

internal/commands/registry.go

@@ -0,0 +1,38 @@
+package commands
+
+import (
+	"context"
+
+	"github.com/disgoorg/disgo/discord"
+	"github.com/disgoorg/disgo/events"
+)
+
+type Command interface {
+	Definition() discord.ApplicationCommandCreate
+	Execute(ctx context.Context, event *events.ApplicationCommandInteractionCreate) error
+}
+
+type Registry struct {
+	commands map[string]Command
+}
+
+func NewRegistry(cmds ...Command) *Registry {
+	registry := &Registry{commands: make(map[string]Command, len(cmds))}
+	for _, cmd := range cmds {
+		registry.commands[cmd.Definition().CommandName()] = cmd
+	}
+	return registry
+}
+
+func (r *Registry) Get(name string) (Command, bool) {
+	cmd, ok := r.commands[name]
+	return cmd, ok
+}
+
+func (r *Registry) Definitions() []discord.ApplicationCommandCreate {
+	definitions := make([]discord.ApplicationCommandCreate, 0, len(r.commands))
+	for _, cmd := range r.commands {
+		definitions = append(definitions, cmd.Definition())
+	}
+	return definitions
+}