Merge pull request #216063 from Stunkymonkey/source-and-tags-phases

  # tag command must create file named $TAG_FILE

  sourceWithTagsDerivation = {name, src, srcDir ? ".", tagSuffix ? "_tags", createTagFiles ? []} :

    stdenv.mkDerivation {

    phases = "unpackPhase buildPhase";

    inherit src srcDir tagSuffix;

    name = "${name}-source-with-tags";

    nativeBuildInputs = [ unzip ];

    # using separate tag directory so that you don't have to glob that much files when starting your editor

    # is this a good choice?

    buildPhase =

    installPhase =

      let createTags = lib.concatStringsSep "\n"

          (map (a: ''

            TAG_FILE="$SRC_DEST/${a.name}$tagSuffix"