flake.nix

{
  description = "Elixir development environment for library";

  inputs = {
    nixpkgs.url = "github:NixOS/nixpkgs";
    flake-utils.url = "github:numtide/flake-utils";
  };

  outputs = { self, nixpkgs, flake-utils }:
    flake-utils.lib.eachDefaultSystem (system:
      let
        pkgs = import nixpkgs { inherit system; };
      in
      {
        devShells.default = with pkgs; mkShell {
          packages = [
            beam.packages.erlang_26.elixir_1_15
          ];

          shellHook = ''
            # limit mix to current project
            mkdir -p .nix-mix
            export MIX_HOME=$PWD/.nix-mix

            # rewire executables
            export PATH=$MIX_HOME/bin:$PATH
            export PATH=$MIX_HOME/escripts:$PATH

            # limit history to current project
            export ERL_AFLAGS="-kernel shell_history enabled -kernel shell_history_path '\"$PWD/.erlang-history\"'"
          '';
        };
      }
    );
}