let sources = import ./nix/sources.nix; pkgs = import sources.nixpkgs {}; pkgs1909 = import (fetchTarball https://github.com/NixOS/nixpkgs/archive/19.09.tar.gz) {}; haskellDeps = ps : with ps; [ shake pandoc data-default protolude pkgs1909.haskellPackages.sws stache ]; ghc = pkgs.haskellPackages.ghcWithPackages haskellDeps; in pkgs.mkShell { buildInputs = with pkgs; [ cacert coreutils html-xml-utils zsh perl perlPackages.URI minify niv ghc git direnv haskellPackages.shake ]; }