mpvScripts.buildLua: Handle scripts packaged as directories

, stdenvNoCC }:

let

  inherit (lib) hasPrefix hasSuffix removeSuffix;

  escapedList = with lib; concatMapStringsSep " " (s: "'${escape [ "'" ] s}'");

  fileName = pathStr: lib.last (lib.splitString "/" pathStr);

  nameFromPath = pathStr:

    let fN = fileName pathStr; in

    if hasSuffix ".lua" fN then

      fN

    else if !(hasPrefix "." fN) then

      "${fN}.lua"

    else

      null

  ;

  scriptsDir = "$out/share/mpv/scripts";

in

lib.makeOverridable (

  let

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

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

      if args ? scriptPath

      then fileName args.scriptPath

      if args ? scriptPath && nameFromPath args.scriptPath != null

      then nameFromPath args.scriptPath

      else "${pname}.lua"

    );

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

    outputHashMode = "recursive";

    installPhase = ''

      runHook preInstall

      if [ -d "${scriptPath}" ]; then

        [ -f "${scriptPath}/main.lua" ] || {

          echo "Script directory '${scriptPath}' does not contain 'main.lua'" >&2

          exit 1

        }

        [ ${with builtins; toString (length extraScripts)} -eq 0 ] || {

          echo "mpvScripts.buildLua does not support 'extraScripts'" \

               "when 'scriptPath' is a directory"

          exit 1

        }

        mkdir -p "${scriptsDir}"

        cp -a "${scriptPath}" "${scriptsDir}/${lib.removeSuffix ".lua" scriptName}"

      else

        install -m644 -Dt "${scriptsDir}" \

          ${escapedList ([ scriptPath ] ++ extraScripts)}

      fi

      runHook postInstall

    '';