nixpkgs/nixos/modules/programs/git.nix

{ config, lib, pkgs, ... }:

with lib;

let
  cfg = config.programs.git;
in

{
  options = {
    programs.git = {
      enable = mkEnableOption "git";

      package = mkOption {
        type = types.package;
        default = pkgs.git;
        defaultText = literalExpression "pkgs.git";
        example = literalExpression "pkgs.gitFull";
        description = "The git package to use";
      };

      config = mkOption {
        type = types.attrs;
        default = { };
        example = {
          init.defaultBranch = "main";
          url."https://github.com/".insteadOf = [ "gh:" "github:" ];
        };
        description = ''
          Configuration to write to /etc/gitconfig. See the CONFIGURATION FILE
          section of git-config(1) for more information.
        '';
      };

      lfs = {
        enable = mkEnableOption "git-lfs";

        package = mkOption {
          type = types.package;
          default = pkgs.git-lfs;
          defaultText = literalExpression "pkgs.git-lfs";
          description = "The git-lfs package to use";
        };
      };
    };
  };

  config = mkMerge [
    (mkIf cfg.enable {
      environment.systemPackages = [ cfg.package ];
      environment.etc.gitconfig = mkIf (cfg.config != {}) {
        text = generators.toGitINI cfg.config;
      };
    })
    (mkIf (cfg.enable && cfg.lfs.enable) {
      environment.systemPackages = [ cfg.lfs.package ];
      programs.git.config = {
        filter.lfs = {
          clean = "git-lfs clean -- %f";
          smudge = "git-lfs smudge -- %f";
          process = "git-lfs filter-process";
          required = true;
        };
      };
    })
  ];

  meta.maintainers = with maintainers; [ figsoda ];
}