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path: root/custom/trivmix-service.nix
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{ name
, run ? null
, connectOut ? null
, connectIn ? null
, group ? null
, initial ? null
, trivmix
, stdenv
, makeWrapper
, jack2Full
, coreutils
, writeScript
}:

let
  connect = (! isNull connectOut) || (! isNull connectIn);
  connectScript = writeScript "connect" ''
    #!${stdenv.shell}

    ${optionalString (! isNull connectIn) "jack_connect ${connectIn} $1"}
    ${optionalString (! isNull connectOut) "jack_connect $2 ${connectOut}"}
  '';
  inherit (stdenv.lib) optionalString;
in {
  wantedBy = [ "sound.target" ];
  requires = [ "jack.service" ];
  before = [ "mpd.service" ];
  serviceConfig = {
    Type = "simple";
    ExecStart = ''${trivmix}/bin/trivmix --client ${name} \
      ${optionalString connect "--run ${connectScript}"} \
      ${optionalString (! isNull run) "--run ${run}"} \
      ${optionalString (! isNull initial) "--level ${initial}"} \
      /dev/shm/mix/${name}/level \
      ${optionalString (! isNull group) "/dev/shm/mix/${group}/level"}
    '';
    User = "jack";
    Group = "audio";
    Nice = "-10";
    LimitRTPRIO = "95:95";
    LimitMEMLOCK = "infinity";
  };
}