flake.nix


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

  outputs = { self, nixpkgs, utils, ... }:
    utils.lib.eachDefaultSystem (system:
      let
        pkgs = nixpkgs.legacyPackages."${system}";
        nativeBuildInputs = with pkgs; [
          flex
          bison
        ];

        buildScript = pkgs.writeScriptBin "build-script"
          ''
            set -e
            prog_name="$1"
            outdir="outputs/$prog_name"
            mkdir -p "$outdir"

            ${pkgs.flex}/bin/flex -o "$outdir"/lex.yy.cc "$prog_name"/main.l
            ${pkgs.gcc}/bin/gcc "$outdir"/lex.yy.cc -o "$outdir"/exec

            ./"$outdir"/exec < "$prog_name"/input
            rm -r outputs
          '';

      in
      rec {
        devShell = pkgs.mkShell {
          nativeBuildInputs = nativeBuildInputs ++ (with pkgs; [
            gcc
          ]);
        };
        defaultApp = {
          type = "app";
          program = "${buildScript}/bin/build-script";
        };
      });
}