Add support for up to 6 players.

internal/server/server.go

@@ -51,14 +51,23 @@ func (s *Server) Handler() http.Handler {
 	return mux
 }
 
-// handleCatalog returns every card in a pack (?pack=…, default Turtle), for the
-// debug panel. Unknown packs fall back to the default.
+// handleCatalog returns every card in the requested packs, for the debug panel
+// and the event log's card previews. Packs come as a repeated or
+// comma-separated ?pack= parameter and default to Turtle; unknown ids fall back
+// to the default pack's cards.
 func (s *Server) handleCatalog(w http.ResponseWriter, req *http.Request) {
-	pack := req.URL.Query().Get("pack")
-	if pack == "" {
-		pack = game.DefaultPack
+	var packs []string
+	for _, v := range req.URL.Query()["pack"] {
+		for _, id := range strings.Split(v, ",") {
+			if id = strings.TrimSpace(id); id != "" {
+				packs = append(packs, id)
+			}
+		}
 	}
-	writeJSON(w, game.CatalogForPack(pack))
+	if len(packs) == 0 {
+		packs = []string{game.DefaultPack}
+	}
+	writeJSON(w, game.CatalogForPacks(packs))
 }
 
 // room is one live game plus its connections.