dev-templates/dhall/flake.nix

{
  description = "A Nix-flake-based Dhall development environment";

  inputs.nixpkgs.url = "github:NixOS/nixpkgs/nixpkgs-unstable";

  outputs =
    { self
    , nixpkgs
    }:

    let
      supportedSystems = [ "x86_64-linux" "aarch64-linux" "x86_64-darwin" "aarch64-darwin" ];
      forEachSupportedSystem = f: nixpkgs.lib.genAttrs supportedSystems (system: f {
        pkgs = import nixpkgs { inherit system; };
      });
    in
    {
      devShells = forEachSupportedSystem ({ pkgs }: {
        default =
          let
            # Helper function for building dhall-* tools
            mkDhallTools = ls: builtins.map (tool: pkgs.haskellPackages."dhall-${tool}") ls;

            dhallTools = mkDhallTools [
              "bash"
              "docs"
              "json"
              "lsp-server"
              "nix"
              "nixpkgs"
              "openapi"
              "toml"
              "yaml"
            ];
          in
          pkgs.mkShell {
            packages = (with pkgs; [ dhall ]) ++ dhallTools;
          };
      });
    };
}