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# 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/.
#
# SPDX-License-Identifier: MPL-2.0

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

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

      forEachSystems =
        f:
        nixpkgs.lib.genAttrs systems (
          system:
          f {
            inherit system;
            pkgs = nixpkgs.legacyPackages.${system};
          }
        );

      formattingPackages =
        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

          # > General-purpose programming language and toolchain for maintaining robust,
          # > optimal, and reusable software
          # https://ziglang.org/
          zig
        ];
    in
    {
      formatter = forEachSystems (
        { pkgs, ... }:
        pkgs.buildFHSEnv {
          name = "dprint-fhs";
          targetPkgs = formattingPackages;
          runScript = "dprint fmt";
        }
      );

      apps = forEachSystems (
        { pkgs, ... }:
        {
          reuse = {
            type = "app";
            program = pkgs.lib.getExe pkgs.reuse;
          };

          dprint = {
            type = "app";
            program = pkgs.lib.getExe pkgs.dprint;
          };
        }
      );
    };
}