flake.nix

{
  inputs = {
      nixpkgs.url = "github:nixos/nixpkgs/nixos-23.05";
      orgRepo = {
        url = "github:FixPlanet/org?rev=9fcdb024ba0cb11aec3b1f8469ec64658c19e2ca";
        flake = false;
      };
  };

  outputs = inputs:
    with inputs; let
      supportedSystems = [
        "aarch64-darwin"
        "aarch64-linux"
        "x86_64-darwin"
        "x86_64-linux"
      ];
      forAllSystems = f: nixpkgs.lib.genAttrs supportedSystems (system: f system);
      nixpkgsFor = forAllSystems (system:
        import nixpkgs {
          inherit system;
          overlays = [];
        });

    in {
      devShell = forAllSystems (system:
      nixpkgsFor.${system}.mkShell {
        packages = with nixpkgsFor.${system}; [
          imagemagick
          rsync
          (ghc.withPackages (ps: with ps; [
            MissingH
            aeson
            blaze-html
            clay
            hakyll
            pkgs.cabal-install
            tagsoup
            time-locale-compat
          ]))
        ];

        shellHook =
          let path = "project-selection-committee";
          in ''
            echo "Copying things from the org repo ..."
            # Committee-member markdown files
            rm -rf src/${path}
            mkdir src/${path}
            cp ${inputs.orgRepo.outPath}/${path}/*.md src/${path}

            # Committee-member mmages
            rm -rf src/images/${path}
            mkdir src/images/${path}
            cp ${inputs.orgRepo.outPath}/${path}/*.webp src/images/${path}

            # "Misc" org docs
            #
            # Note: Because of the way Hakyll works, we use pandoc (the tool) to
            # convert these to HTML so that we can include them in the website using
            # the $partial(...)$ directive.
            rm -rf src/org-docs
            mkdir src/org-docs

            # The "essential criteria" part of the document.
            pandoc ${inputs.orgRepo.outPath}/constitution/essential-criteria.md -o src/org-docs/essential-criteria.html
            echo "Done."
            '';
      }
      );
    };
}