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# SPDX-License-Identifier: AGPL-3.0-only
# Copyright 2025 Shota FUJI
#
# This program is free software: you can redistribute it and/or modify it under the terms
# of the GNU Affero General Public License as published by the Free Software Foundation,
# either version 3 of the License, or (at your option) any later version.
#
# This program is distributed in the hope that it will be useful, but WITHOUT ANY
# WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A
# PARTICULAR PURPOSE.  See the GNU Affero General Public License for more details.
#
# You should have received a copy of the GNU Affero General Public License along
# with this program.  If not, see <http://www.gnu.org/licenses/>.

{
  inputs = {
    nixpkgs.url = "github:nixos/nixpkgs/nixpkgs-unstable";
    flake-utils.url = "github:numtide/flake-utils";
    mkElmDerivation = {
      url = "github:jeslie0/mkElmDerivation";
      inputs.nixpkgs.follows = "nixpkgs";
    };
  };

  outputs =
    {
      self,
      nixpkgs,
      flake-utils,
      mkElmDerivation,
    }:
    flake-utils.lib.eachDefaultSystem (
      system:
      let
        pkgs = import nixpkgs {
          overlays = [ mkElmDerivation.overlays.default ];
          inherit system;
        };
      in
      rec {
        packages = {
          demo = pkgs.callPackage ./demo { };
          docs = pkgs.callPackage ./docs { };
        };

        formatter = pkgs.buildFHSEnv {
          name = "fhs-dprint";
          runScript = "dprint fmt";

          targetPkgs =
            pkgs: with pkgs; [
              # Code formatting platform written in Rust
              # https://dprint.dev/
              dprint

              # > A source code formatter for Elm
              # https://github.com/avh4/elm-format
              elmPackages.elm-format

              # Official formatter for Nix code
              # https://github.com/NixOS/nixfmt
              nixfmt

              zig_0_16
            ];
        };

        apps = {
          # Code formatting platform written in Rust
          # https://dprint.dev/
          dprint = {
            type = "app";
            program = pkgs.lib.getExe pkgs.dprint;
          };

          # > Fast and extensible multi-platform HTTP/1-2-3 web server with automatic HTTPS
          # https://caddyserver.com/
          caddy = {
            type = "app";
            program = pkgs.lib.getExe pkgs.caddy;
          };

          # > Copyright and license linter based on SPDX
          # https://github.com/fsfe/reuse-tool
          reuse = {
            type = "app";
            program = pkgs.lib.getExe pkgs.reuse;
          };
        };

        devShell = pkgs.mkShell {
          packages =
            with pkgs;
            [
              # > Language server implementation for Elm
              # https://github.com/elm-tooling/elm-language-server
              elmPackages.elm-language-server

              # > Zig LSP implementation + Zig Language Server
              # https://github.com/zigtools/zls
              zls_0_16
            ]
            ++ packages.demo.nativeBuildInputs
            ++ packages.docs.nativeBuildInputs;
        };
      }
    );
}