{ cairo
, cmake
, fetchFromGitHub
, libXdmcp
, libpthreadstubs
, libxcb
, pcre
, pkg-config
, python3
, lib
, stdenv
, xcbproto
, xcbutil
, xcbutilcursor
, xcbutilimage
, xcbutilrenderutil
, xcbutilwm
, xcbutilxrm
, makeWrapper
, removeReferencesTo

# optional packages-- override the variables ending in 'Support' to enable or
# disable modules
, alsaSupport   ? true,  alsaLib       ? null
, githubSupport ? false, curl          ? null
, mpdSupport    ? false, libmpdclient ? null
, pulseSupport  ? false, libpulseaudio ? null
, iwSupport     ? false, wirelesstools ? null
, nlSupport     ? true,  libnl         ? null
, i3Support ? false, i3GapsSupport ? false, i3 ? null, i3-gaps ? null, jsoncpp ? null
}:

assert alsaSupport   -> alsaLib       != null;
assert githubSupport -> curl          != null;
assert mpdSupport    -> libmpdclient != null;
assert pulseSupport  -> libpulseaudio != null;

assert iwSupport     -> ! nlSupport && wirelesstools != null;
assert nlSupport     -> ! iwSupport && libnl         != null;

assert i3Support     -> ! i3GapsSupport && jsoncpp != null && i3      != null;
assert i3GapsSupport -> ! i3Support     && jsoncpp != null && i3-gaps != null;

stdenv.mkDerivation rec {
    pname = "polybar";
    version = "3.5.2";

    src = fetchFromGitHub {
      owner = pname;
      repo = pname;
      rev = version;
      sha256 = "1ir8fdnzrba9fkkjfvax5szx5h49lavwgl9pabjzrpbvif328g3x";
      fetchSubmodules = true;
    };

    buildInputs = [
      cairo
      libXdmcp
      libpthreadstubs
      libxcb
      pcre
      python3
      xcbproto
      xcbutil
      xcbutilcursor
      xcbutilimage
      xcbutilrenderutil
      xcbutilwm
      xcbutilxrm

      (if alsaSupport   then alsaLib       else null)
      (if githubSupport then curl          else null)
      (if mpdSupport    then libmpdclient  else null)
      (if pulseSupport  then libpulseaudio else null)

      (if iwSupport     then wirelesstools else null)
      (if nlSupport     then libnl         else null)

      (if i3Support || i3GapsSupport then jsoncpp else null)
      (if i3Support then i3 else null)
      (if i3GapsSupport then i3-gaps else null)

      (if i3Support || i3GapsSupport then makeWrapper else null)
    ];

    postInstall = if i3Support
                  then ''wrapProgram $out/bin/polybar \
                           --prefix PATH : "${i3}/bin"
                       ''
                  else if i3GapsSupport
                  then ''wrapProgram $out/bin/polybar \
                           --prefix PATH : "${i3-gaps}/bin"
                       ''
                  else '''';

    nativeBuildInputs = [
      cmake
      pkg-config
      removeReferencesTo
    ];

    postFixup = ''
        remove-references-to -t ${stdenv.cc} $out/bin/polybar
    '';

    meta = with lib; {
      homepage = "https://polybar.github.io/";
      description = "A fast and easy-to-use tool for creating status bars";
      longDescription = ''
        Polybar aims to help users build beautiful and highly customizable
        status bars for their desktop environment, without the need of
        having a black belt in shell scripting.
      '';
      license = licenses.mit;
      maintainers = with maintainers; [ afldcr Br1ght0ne ];
      platforms = platforms.linux;
    };
}