feat: joke & dice command

internal/commands/fun/public/dice.go

@@ -0,0 +1,62 @@
+package public
+
+import (
+	"strings"
+
+	"velox-bot/internal/commands/fun/shared"
+	"velox-bot/internal/diceexpr"
+
+	"github.com/bwmarrin/discordgo"
+)
+
+var Dice = &discordgo.ApplicationCommand{
+	Name:        "dice",
+	Description: "Roll dice expressions (e.g. d20, 2d20+1, 2#d20+1)",
+	Options: []*discordgo.ApplicationCommandOption{
+		{
+			Type:        discordgo.ApplicationCommandOptionString,
+			Name:        "expr",
+			Description: "Dice expression to roll",
+			Required:    true,
+		},
+	},
+	Contexts: &[]discordgo.InteractionContextType{
+		discordgo.InteractionContextGuild,
+		discordgo.InteractionContextBotDM,
+		discordgo.InteractionContextPrivateChannel,
+	},
+}
+
+func DiceHandler(s *discordgo.Session, i *discordgo.InteractionCreate) {
+	expr := ""
+	if opts := i.ApplicationCommandData().Options; len(opts) > 0 {
+		expr = opts[0].StringValue()
+	}
+	expr = strings.TrimSpace(expr)
+	if expr == "" {
+		respondDiceFailure(s, i)
+		return
+	}
+
+	res, err := diceexpr.EvalMany(expr, diceexpr.DefaultLimits())
+	if err != nil {
+		respondDiceFailure(s, i)
+		return
+	}
+
+	out := diceexpr.FormatResult(res, diceexpr.DefaultFormatOptions())
+	if len(out) > 1900 {
+		// Keep within Discord message limits; trim safely.
+		out = out[:1900] + "…"
+	}
+	shared.Respond(s, i, out)
+}
+
+func respondDiceFailure(s *discordgo.Session, i *discordgo.InteractionCreate) {
+	if i.GuildID != "" {
+		shared.RespondEphemeral(s, i, "Failure!")
+		return
+	}
+	shared.Respond(s, i, "Failure!")
+}
+