emqx4.3/include/emqttd_cli.hrl

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-define(PRINT(Format, Args),
    io:format(Format, Args)).

-define(PRINT_MSG(Msg),
    io:format(Msg)).

-define(PRINT_CMD(Cmd, Descr),
    io:format("~-40s#~s~n", [Cmd, Descr])).

-define(USAGE(CmdList),
    [?PRINT_CMD(Cmd, Descr) || {Cmd, Descr} <- CmdList]).