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  •   description = "gbs-downloader";
    
    
      inputs = {
        # Nix Inputs
        nixpkgs.follows = "hs-flake-utils/nixpkgs";
        flake-utils.url = github:numtide/flake-utils;
        hs-flake-utils.url = "git+https://whetstone.private.storage/jcalderone/hs-flake-utils.git?ref=main";
    
          url = "git+https://whetstone.private.storage/PrivateStorage/tahoe-directory.git?ref=refs/tags/0.1.0.0";
    
          inputs.nixpkgs.follows = "hs-flake-utils/nixpkgs";
        };
    
    
        tahoe-chk.follows = "tahoe-directory/tahoe-chk";
        tahoe-ssk.follows = "tahoe-directory/tahoe-ssk";
        tahoe-capabilities.follows = "tahoe-directory/tahoe-capabilities";
    
        tahoe-great-black-swamp = {
    
          url = "git+https://whetstone.private.storage/PrivateStorage/tahoe-great-black-swamp?ref=refs/tags/0.3.0.0";
    
          inputs.nixpkgs.follows = "hs-flake-utils/nixpkgs";
    
          inputs.tahoe-chk.follows = "tahoe-chk";
    
      };
    
      outputs = {
        self,
        nixpkgs,
        flake-utils,
        hs-flake-utils,
    
        tahoe-capabilities,
        tahoe-directory,
    
      }: let
        ulib = flake-utils.lib;
        ghcVersion = "ghc8107";
      in
        ulib.eachSystem ["x86_64-linux" "aarch64-darwin"] (system: let
          # Get a nixpkgs customized for this system and including our overlay.
          pkgs = import nixpkgs {
            inherit system;
          };
          hslib = hs-flake-utils.lib {
            inherit pkgs;
            src = ./.;
            compilerVersion = ghcVersion;
    
            packageName = "gbs-downloader";
    
            hsPkgsOverrides = hfinal: hprev: {
    
              tahoe-chk = tahoe-chk.outputs.packages.${system}.default;
    
              tahoe-ssk = tahoe-ssk.outputs.packages.${system}.default;
    
              tahoe-directory = tahoe-directory.outputs.packages.${system}.default;
              tahoe-capabilities = tahoe-capabilities.outputs.packages.${system}.default;
    
              tahoe-great-black-swamp = tahoe-great-black-swamp.outputs.packages.${system}.default;
    
    
              # A broken dependency of a tahoe-great-black-swamp executable that
              # we don't use.  Flip the broken bit so we can get a build.
              language-ecmascript = pkgs.haskell.unmarkBroken hprev.language-ecmascript;
    
          };
        in {
          checks = hslib.checks {};
    
          devShells = hslib.devShells {
    
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              nix run .#generate-cabal-project
    
            extraBuildInputs = pkgs:
              with pkgs; [
    
                # We configure cabal to use zlib:pkg-config so we better supply
                # pkg-config in the dev shell or `cabal ...` builds will surely
                # fail.
                pkg-config
    
                # And also that pesky zlib dependency.
    
          packages = hslib.packages {};
          apps.hlint = hslib.apps.hlint {};
    
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          apps.generate-cabal-project = {
            type = "app";
            program = "${
              pkgs.writeShellApplication {
                name = "generate-cabal-project";
                text = ''
                  cat >cabal.project.local <<EOF
                  -- This file is auto-generated by the flake devShell's shellHook.  Do
                  -- not edit this file.  Make changes in flake.nix.
    
                  package zlib
                    -- by default the cabal build won't use pkg-config to find the
                    -- underlying zlib c library.  this will most likely cause
                    -- "cabal build" to fail (unless other steps are taken).  turn
                    -- on pkg-config so that the cabal-test app below can succeed.
                    flags: -bundled-c-zlib -non-blocking-ffi +pkg-config
    
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                  EOF
                '';
              }
            }/bin/generate-cabal-project";
          };
    
    
          apps.entr-test = {
            type = "app";
            program = "${
              pkgs.writeShellApplication {
                name = "entr-test";
                runtimeInputs = with pkgs; [
                  entr
                  cabal-install
                  haskell.compiler.${ghcVersion}
                ];
    
                text = ''
    
                  find . -iname '*.hs' -or -iname '*.cabal' | entr bash -c "cabal run tests; if [ \$? != 0 ]; then printf '\e[31m%s\e[0m\n' \"FAILED: \$?\"; else printf '\e[32m%s\e[0m\n' 'SUCCESS'; fi"
    
                '';
              }
            }/bin/entr-test";
          };
    
          apps.release = hslib.apps.release {};
    
    
          # Using the working directory of `nix run`, do a build with cabal and
          # then run the test suite.
    
          apps.cabal-test = hslib.apps.cabal-test {
            preBuild = ''
              # Refresh the cabal.project.local file to point to the correct
              # dependencies, if necessary.
              nix run .#generate-cabal-project
    
              # Here we make zlib discoverable by pkg-config so cabal can find
              # headers and stuff.
              export PKG_CONFIG_PATH=${pkgs.lib.makeSearchPath "lib/pkgconfig" [pkgs.zlib.dev]}
            '';