neovim: improve lpeg patch for darwin

    nvim-lpeg-dylib =

      luapkgs:

      if stdenv.hostPlatform.isDarwin then

        let

          luaLibDir = "$out/lib/lua/${lib.versions.majorMinor luapkgs.lua.luaversion}";

        in

        (luapkgs.lpeg.overrideAttrs (oa: {

          preConfigure = ''

            # neovim wants clang .dylib

            sed -i makefile -e "s/CC = gcc/CC = clang/"

            sed -i makefile -e "s/-bundle/-dynamiclib/"

            substituteInPlace Makefile \

              --replace-fail "CC = gcc" "CC = clang" \

              --replace-fail "-bundle" "-dynamiclib" \

              --replace-fail "lpeg.so" "lpeg.dylib"

          '';

          preBuild = ''

            # there seems to be implicit calls to Makefile from luarocks, we need to

            # add a stage to build our dylib

            make macosx

            mkdir -p $out/lib

            mv lpeg.so $out/lib/lpeg.dylib

            mkdir -p ${luaLibDir}

            mv lpeg.dylib ${luaLibDir}/lpeg.dylib

          '';

          postInstall = ''

            rm -f ${luaLibDir}/lpeg.so

          '';

          nativeBuildInputs =

            oa.nativeBuildInputs ++ (lib.optional stdenv.hostPlatform.isDarwin fixDarwinDylibNames);