flake.nix

{
  description = "yaaaaaaaaaaaaaaaaaaaaa";

  inputs = {
    nixpkgs.url = "github:nixos/nixpkgs/nixos-unstable";
    flake-utils.url = "github:numtide/flake-utils";

    zls = {
      url = "github:zigtools/zls/0.12.0";
      inputs.nixpkgs.follows = "nixpkgs";
      inputs.flake-utils.follows = "flake-utils";
    };
  };

  outputs = inputs:
    inputs.flake-utils.lib.eachDefaultSystem (system: let
      flakePackage = flake: package: flake.packages."${system}"."${package}";
      flakeDefaultPackage = flake: flakePackage flake "default";

      pkgs = import inputs.nixpkgs {
        inherit system;
      };

      packages_without_hook = with pkgs; [
        pkg-config
        # - [river.nix nixpkgs](https://github.com/NixOS/nixpkgs/blob/nixos-unstable/pkgs/applications/window-managers/river/default.nix#L41)
        zig_0_12
        zathura

        pango
        cairo
        girara

        # opencv
        imagemagick
      ];
      zathura-images = pkgs.stdenv.mkDerivation rec {
        name = "zathura-images";

        src = pkgs.lib.cleanSource ./.;

        installPhase = ''
          mkdir -p $out/lib/zathura
          mv ./zig-out/lib/lib${name}.so $out/lib/zathura/.

          mkdir -p $out/share/applications
          cp ./meta/*.desktop $out/share/applications/.
          mkdir -p $out/share/metainfo
          cp ./meta/*.metainfo.xml $out/share/metainfo/.
        '';

        nativeBuildInputs =
          [
            pkgs.zig_0_12.hook
          ]
          ++ packages_without_hook;
      };
      # - [Overriding | nixpkgs](https://ryantm.github.io/nixpkgs/using/overrides/)
      zathura-images-overlay = self: super: {
        # - [this overlay broke](https://github.com/NixOS/nixpkgs/commit/3dc8993b21cf1be360547f24e580ccbc351b7e0f)
        # zathura = super.zathura.override (prev: {
        #   plugins = (prev.plugins or []) ++ [zathura-images];
        # });

        # - [zathura nixpkgs](https://github.com/NixOS/nixpkgs/blob/e2605d0744c2417b09f8bf850dfca42fcf537d34/pkgs/applications/misc/zathura/wrapper.nix#L39)
        # this works, but default plugins break everything
        #   - [zathura-bc](https://github.com/pwmt/zathura-cb/blob/8071728ee16215f41b535e65fef5ebe774fab15a/zathura-cb/plugin.c#L23)
        # zathura = pkgs.symlinkJoin {
        #   name = "${super.zathura.name}-with-zathura-images";
        #   nativeBuildInputs = [ pkgs.makeWrapper ];

        #   paths = [zathura-images];

        #   postBuild = ''
        #     makeWrapper ${super.zathura}/bin/zathura $out/bin/zathura \
        #       --prefix ZATHURA_PLUGINS_PATH : "$out/lib/zathura"
        #   '';
        # };

        # default plugins include zathura_cb. which overrides inode/directory but does not render properly
        # so i have to specify zathura-images before it
        zathura = super.zathura.override (prev: {
          # - [](https://github.com/NixOS/nixpkgs/blob/3dc8993b21cf1be360547f24e580ccbc351b7e0f/pkgs/applications/misc/zathura/wrapper.nix#L13-L18)
          plugins = [
            zathura-images
            prev.zathura_cb
            prev.zathura_djvu
            prev.zathura_ps
            (
              if prev.useMupdf
              then prev.zathura_pdf_mupdf
              else prev.zathura_pdf_poppler
            )
          ];
        });
      };

      fhs = pkgs.buildFHSEnv {
        name = "fhs-shell";
        targetPkgs = p: (env-packages p) ++ (custom-commands p);
        runScript = "${pkgs.zsh}/bin/zsh";
        profile = ''
          export FHS=1
          # source ./.venv/bin/activate
          # source .env
        '';
      };
      custom-commands = pkgs: [
      ];

      env-packages = pkgs:
        with pkgs;
          [
            # unstable.zls
            (flakeDefaultPackage inputs.zls)
            (import inputs.nixpkgs {
              overlays = [zathura-images-overlay];
              inherit system;
            })
            .zathura
            # zathura
          ]
          ++ (custom-commands pkgs);

      stdenv = pkgs.clangStdenv;
      # stdenv = pkgs.gccStdenv;
    in {
      packages = {
        default = zathura-images;
        inherit zathura-images;
      };
      overlays = {
        default = zathura-images-overlay;
        zathura-images-overlay = zathura-images-overlay;
      };

      devShells.default =
        pkgs.mkShell.override {
          inherit stdenv;
        } {
          nativeBuildInputs = (env-packages pkgs) ++ [fhs] ++ packages_without_hook;
          inputsFrom = [
            # zathura-images
          ];
          shellHook = ''
            export PROJECT_ROOT="$(pwd)"
            export LIBCLANG_PATH="${pkgs.llvmPackages.libclang.lib}/lib";
            export CLANGD_FLAGS="--compile-commands-dir=$PROJECT_ROOT/plugin --query-driver=$(which $CXX)"
          '';
        };
    });
}