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# SPDX-License-Identifier: MPL-2.0
# Copyright 2026 Shota FUJI
#
# This Source Code Form is subject to the terms of the Mozilla Public
# License, v. 2.0. If a copy of the MPL was not distributed with this
# file, You can obtain one at https://mozilla.org/MPL/2.0/.

{
  inputs = {
    nixpkgs.url = "github:nixos/nixpkgs/nixpkgs-unstable";
  };

  outputs =
    { self, nixpkgs }:
    let
      supportedSystems = [ "x86_64-linux" ];

      forEachSystems =
        f:
        nixpkgs.lib.genAttrs supportedSystems (
          system:
          f {
            inherit system;
            pkgs = import nixpkgs { inherit system; };
          }
        );
    in
    rec {
      packages = forEachSystems (
        { pkgs, ... }: {
          docs = pkgs.callPackage ./docs { };
          example = pkgs.callPackage ./example.nix { };
        }
      );

      formatter = forEachSystems (
        { pkgs, ... }:
        pkgs.buildFHSEnv {
          name = "fhs-dprint";
          runScript = "dprint fmt";

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

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

              zig_0_16
            ];
        }
      );

      apps = forEachSystems (
        { pkgs, ... }: {
          # 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;
          };
        }
      );

      devShells = forEachSystems (
        { pkgs, system }: {
          default = pkgs.mkShell {
            packages =
              with pkgs;
              [
                # > Zig LSP implementation + Zig Language Server
                # https://github.com/zigtools/zls
                zls_0_16
              ]
              ++ packages.${system}.docs.nativeBuildInputs;
          };
        }
      );
    };
}