mpvScripts.buildLua: Infer `scriptName` from `scriptPath` over `pname`

in

lib.makeOverridable (

  { pname

  , scriptPath ? "${pname}.lua"

  , extraScripts ? []

  , ... }@args:

  let

    # either passthru.scriptName, inferred from scriptPath, or from pname

    scriptName = (args.passthru or {}).scriptName or (

      if args ? scriptPath

      then fileName args.scriptPath

      else "${pname}.lua"

    );

    scriptPath = args.scriptPath or "./${scriptName}";

  in

  stdenvNoCC.mkDerivation (lib.attrsets.recursiveUpdate {

    dontBuild = true;

    preferLocalBuild = true;

      runHook postInstall

    '';

    passthru.scriptName = fileName scriptPath;

    passthru = { inherit scriptName; };

    meta.platforms = lib.platforms.all;

  } args)

)