force - to be the only argument

Author: natnat-mc

bin/moonc

@@ -24,6 +24,11 @@ local read_stdin = arg[1] == "-" -- luacheck: ignore 113
 
 if not read_stdin then
 	parser:argument("file/directory"):args("+")
+else
+	if arg[2] ~= nil then
+		io.stderr:write("- must be the only argument\n")
+		os.exit(1)
+	end
 end
 
 local opts = read_stdin and {} or parser:parse()