gistfile1.java

dispatcher.registerCommand(
    literal("scoreboard").then(
        literal("players").then(
            literal("reset").then(
                argument("players", players()).then(
                    optional("objective", objective())
                ).executes(SOME_COMMAND)
            )
        ).then(
            literal("list").then(
                argument("players", players())
            ).executes(SOME_COMMAND)
        )
    ).then(
        literal("objectives").then(
            literal("list").executes(SOME_COMMAND)
        ).then(
            literal("setdisplay").then(
                argument("slot", enumValues(ScoreboardSlotTypes.class)).then(
                    argument("objective", objective())
                ).executes(SOME_COMMAND)
            )
        )
    )
);