flake.nix

{
  inputs = {
    nixpkgs.url = "github:NixOS/nixpkgs/nixos-unstable";
    flake-utils.url = "github:numtide/flake-utils";
    purescript-overlay.url = "github:thomashoneyman/purescript-overlay";
    purescript-overlay.inputs.nixpkgs.follows = "nixpkgs";
  };

  outputs = {
    self,
    nixpkgs,
    flake-utils,
    purescript-overlay,
  }:
    flake-utils.lib.eachDefaultSystem (system: let
      overlays = [purescript-overlay.overlays.default];
      pkgs = import nixpkgs {inherit system overlays;};
      scripts = pkgs.symlinkJoin {
        name = "scripts";
        paths = pkgs.lib.mapAttrsToList pkgs.writeShellScriptBin {
          run-install = ''
            spago install
          '';

          run-test = ''
            spago test
          '';

          run-check-format = ''
            purs-tidy check src test
          '';
        };
      };
    in {
      devShells.default = pkgs.mkShell {
        buildInputs = with pkgs; [
          scripts

          # PureScript tools
          purs
          purs-tidy
          purs-backend-es
          spago-unstable
          # Node
          nodejs
          # Nix
          alejandra
          # Scripting
          just
        ];
      };

      checks = {
        format =
          pkgs.runCommand "check-format"
          {
            buildInputs = with pkgs; [
              alejandra
            ];
          } ''
            ${pkgs.alejandra}/bin/alejandra --check ${./.}
            touch $out
          '';
      };
    });
}