luaPackages: introduce an alias mechanism

# similar to interpreters/python/default.nix

{ stdenv, lib, callPackage, fetchFromGitHub, fetchurl, fetchpatch, makeBinaryWrapper }:

{ stdenv, config, lib, callPackage, fetchFromGitHub, fetchurl, fetchpatch, makeBinaryWrapper }:

let

            selfHostHost = luaOnHostForHost.pkgs;

            selfTargetTarget = luaOnTargetForTarget.pkgs or {};

          };

          aliases = final: prev:

            lib.optionalAttrs config.allowAliases

              (import ../../lua-modules/aliases.nix lib final prev);

          extensions = lib.composeManyExtensions [

            aliases

            generatedPackages

            overriddenPackages

            overrides

lib: self: super:

### Deprecated aliases - for backward compatibility

###

### !!! NOTE !!!

### Use `./remove-attr.py [attrname]` in this directory to remove your alias

### from the `luaPackages` set without regenerating the entire file.

with self;

let

  # Removing recurseForDerivation prevents derivations of aliased attribute

  # set to appear while listing all the packages available.

  removeRecurseForDerivations = alias: with lib;

    if alias.recurseForDerivations or false

    then removeAttrs alias ["recurseForDerivations"]

    else alias;

  # Disabling distribution prevents top-level aliases for non-recursed package

  # sets from building on Hydra.

  removeDistribute = alias: with lib;

    if isDerivation alias then

      dontDistribute alias

    else alias;

  # Make sure that we are not shadowing something from node-packages.nix.

  checkInPkgs = n: alias:

    if builtins.hasAttr n super

    then throw "Alias ${n} is still in generated.nix"

    else alias;

  mapAliases = aliases:

    lib.mapAttrs (n: alias:

      removeDistribute

        (removeRecurseForDerivations

          (checkInPkgs n alias)))

      aliases;

in

mapAliases {

}