flake.nix

{
  description = "hledger-importer";

  inputs = {
    haskellNix.url = "github:input-output-hk/haskell.nix";
    nixpkgs.follows = "haskellNix/nixpkgs-unstable";
    flake-utils.url = "github:numtide/flake-utils";
    devshell.url = "github:numtide/devshell";
  };
  nixConfig = {
    extra-substituters = [ "https://cache.iog.io" ];
    extra-trusted-public-keys =
      [ "hydra.iohk.io:f/Ea+s+dFdN+3Y/G+FDgSq+a5NEWhJGzdjvKNGv0/EQ=" ];
  };

  outputs = inputs@{ self, flake-utils, haskellNix, devshell, nixpkgs, ... }:
    flake-utils.lib.eachSystem [ "x86_64-linux" "x86_64-darwin" ] (system:
      let
        overlays = [
          haskellNix.overlay
          (final: prev: {
            hledger-importer = final.haskell-nix.project' {
              src = ./.;
              compiler-nix-name = "ghc966";
            };
          })
          devshell.overlays.default
        ];
        pkgs = import nixpkgs {
          inherit system overlays;
          inherit (haskellNix) config;
        };
        flake = pkgs.hledger-importer.flake { };
        shellWithToml = tomls:
          pkgs.hledger-importer.shellFor {
            exactDeps = false;
            withHoogle = true;
            inputsFrom = [
              (pkgs.devshell.mkShell {
                name = "hledger-importer";
                packages = with pkgs; [ libiconv pkg-config ];
                imports =
                  map pkgs.devshell.importTOML ([ ./devshell.toml ] ++ tomls);
              })
            ];
            tools = {
              cabal = "latest";
              fourmolu = "latest";
              hlint = "latest";
              cabal-fmt = "latest";
              haskell-language-server = "latest";
            };
          };
      in flake // {
        packages = {
          default = flake.packages."hledger-importer:exe:hledger-importer-exe";
        };
        devShells = { default = shellWithToml [ ]; };
      });

}