add options handler

context.go

@@ -126,3 +126,9 @@ func (c *Ctx) User() (u *discordgo.User) {
 	}
 	return
 }
+
+// Options returns the application command data options
+// with additional functionality methods.
+func (c *Ctx) Options() CommandOptions {
+	return c.Event.ApplicationCommandData().Options
+}

example/middlewares/commands/kick.go

@@ -57,8 +57,8 @@ func (c *KickCommand) Run(ctx *ken.Ctx) (err error) {
 		return
 	}
 
-	user := ctx.Event.ApplicationCommandData().Options[0].UserValue(ctx.Session)
-	reason := ctx.Event.ApplicationCommandData().Options[1].StringValue()
+	user := ctx.Options().GetByName("member").UserValue(ctx.Session)
+	reason := ctx.Options().GetByName("reason").StringValue()
 
 	if err = ctx.Session.GuildMemberDeleteWithReason(ctx.Event.GuildID, user.ID, reason); err != nil {
 		return

options.go

@@ -0,0 +1,50 @@
+package ken
+
+import (
+	"github.com/bwmarrin/discordgo"
+)
+
+// CommandOptions provides additional functionailities to
+// an array of ApplicationCommandInteractionDataOptions.
+type CommandOptions []*discordgo.ApplicationCommandInteractionDataOption
+
+// Get safely returns an options from command options
+// by index.
+func (co CommandOptions) Get(i int) *discordgo.ApplicationCommandInteractionDataOption {
+	if i < 0 {
+		i = 0
+	}
+	if i >= len(co) {
+		i = len(co) - 1
+	}
+	return co[i]
+}
+
+// Options returns wrapped underlying options
+// of a sub command by ID.
+func (co CommandOptions) Options(i int) CommandOptions {
+	return co.Get(i).Options
+}
+
+// GetByNameOptional returns an option by name. If the option with the
+// name does not exist, the returned value for ok is false.
+//
+// This should be used for non-required options.
+func (co CommandOptions) GetByNameOptional(name string) (ok bool, opt *discordgo.ApplicationCommandInteractionDataOption) {
+	for _, c := range co {
+		if c.Name == name {
+			ok = true
+			opt = c
+			break
+		}
+	}
+	return
+}
+
+// GetByName returns an option by name.
+//
+// This should only be used on required options.
+func (co CommandOptions) GetByName(name string) (opt *discordgo.ApplicationCommandInteractionDataOption) {
+	_, opt = co.GetByNameOptional(name)
+	return
+}