xmonad-contrib/flake.nix

# This file is maintained by @IvanMalison (github)
{
  inputs = {
    flake-utils.url = github:numtide/flake-utils;
    git-ignore-nix.url = github:hercules-ci/gitignore.nix/master;
    xmonad.url = github:xmonad/xmonad;
  };
  outputs = { self, flake-utils, nixpkgs, git-ignore-nix, xmonad }:
  let
    hoverlay = final: prev: hself: hsuper: {
      xmonad-contrib = hself.callCabal2nix "xmonad-contrib"
        (git-ignore-nix.lib.gitignoreSource ./.) { };
    };
    overlay = xmonad.lib.fromHOL hoverlay { };
    overlays = xmonad.overlays ++ [ overlay ];
  in flake-utils.lib.eachDefaultSystem (system:
  let
    pkgs = import nixpkgs { inherit system overlays; };
    modifyDevShell =
      if builtins.pathExists ./develop.nix
      then import ./develop.nix
      else _: x: x;
  in
  rec {
    devShell = pkgs.haskellPackages.shellFor (modifyDevShell pkgs {
      packages = p: [ p.xmonad-contrib ];
      nativeBuildInputs = [ pkgs.cabal-install ];
    });
    defaultPackage = pkgs.haskellPackages.xmonad-contrib;
  }) // { inherit hoverlay overlay overlays; } ;
}