shell.nix

# This file is used by nix-shell.
{ config ? {}
, sourcesOverride ? {}
, withHoogle ? true
, pkgs ? import ./nix {
    inherit config sourcesOverride;
  }
}:
with pkgs;
let
  # This provides a development environment that can be used with nix-shell or
  # lorri. See https://The-Blockchain-Company.github.io/haskell.nix/user-guide/development/
  shell = tbcoMonitoringHaskellPackages.shellFor {
    name = "cabal-dev-shell";

    # If shellFor local packages selection is wrong,
    # then list all local packages then include source-repository-package that cabal complains about:
    packages = ps: with ps; [
      contra-tracer
      tbco-monitoring
      lobemo-backend-aggregation
      lobemo-backend-editor
      lobemo-backend-ekg
      lobemo-backend-graylog
      lobemo-backend-monitoring
      lobemo-backend-trace-acceptor
      lobemo-backend-trace-forwarder
      lobemo-scribe-systemd
      lobemo-examples
      tracer-transformers
    ];

    # These programs will be available inside the nix-shell.
    buildInputs = with haskellPackages; [
      cabal-install
      niv
    ] ++ (lib.optionals stdenv.isLinux [ pkg-config systemd ]);

    # Prevents cabal from choosing alternate plans, so that
    # *all* dependencies are provided by Nix.
    exactDeps = true;

    inherit withHoogle;
  };

  devops = pkgs.stdenv.mkDerivation {
    name = "devops-shell";
    buildInputs = [
      niv
    ];
    shellHook = ''
      echo "DevOps Tools" \
      | ${figlet}/bin/figlet -f banner -c \
      | ${lolcat}/bin/lolcat

      echo "NOTE: you may need to export GITHUB_TOKEN if you hit rate limits with niv"
      echo "Commands:
        * niv update <package> - update package

      "
    '';
  };

in

 shell // { inherit devops; }