{ config, lib, pkgs, ... }:

let
  hledger-repo = pkgs.fetchFromGitHub {
    owner = "chvp";
    repo = "hledger";
    rev = "feature/gain-reports";
    sha256 = "07qsrq71pnkys11q6k2zc20xc9l3yp8dhzp1ar5bnkgcwbm69rcx";
  };
in
{
  options.chvp.hledger.enable = lib.mkOption {
    default = false;
    example = true;
  };

  config = lib.mkIf config.chvp.hledger.enable {
    nixpkgs.overlays = [
      (self: super: {
        haskellPackages = super.haskellPackages.override {
          overrides = hself: hsuper: rec {
            hledger = hsuper.callCabal2nixWithOptions "hledger" hledger-repo "--subpath hledger" { };
            hledger-lib = hsuper.callCabal2nixWithOptions "hledger-lib" hledger-repo "--subpath hledger-lib" { };
          };
        };
      })
    ];
    home-manager.users.charlotte = { ... }: {
      home.packages = [ pkgs.hledger ];
    };
  };
}