{ lib, pkgs, config, hostname, ... }: let
  inherit (lib) mkIf mkEnableOption mkOption types mergeAttrs;
  cfg = config.chuj.stuff.fish;
  user = config.chuj.system.user;
in {
  options.chuj.stuff.fish = {
    enable = mkEnableOption "fish";
    extraAliases = mkOption {
      type = types.attrs;
      default = {};
    };
  };

  config = let
    XDG_DATA_HOME = config.home-manager.users.${user}.xdg.dataHome;
  in mkIf cfg.enable {
    environment.systemPackages = [ pkgs.fish ];
    programs.fish.enable = true;
    users.users.${user}.shell = pkgs.fish;

    programs.fish.promptInit = ''
      ${pkgs.any-nix-shell}/bin/any-nix-shell fish --info-right | source
    '';

    home-manager.users.${user}.programs.fish = {
      enable = true;

      # todo: move some to abbrs
      shellAliases = mergeAttrs {
        "ls" = "${pkgs.eza}/bin/eza -lhs type";
        "cp" = "cp -v";
        "mv" = "mv -v";
        "ytmp3" = "yt-dlp -o '%(title)s.%(ext)s' -x --audio-format mp3";
        "myip" = "curl ifconfig.me";
        "0x0" = ''curl -F"file=@$argv" https://0x0.st'';
        "wget" = "${pkgs.wget}/bin/wget --hsts-file='${XDG_DATA_HOME}/wget-hsts'";

        # ulimit -n 4096 fixes the "too many open files" error i get sometimes when
        # updating the entire flake
        "rebuild" = "ulimit -n 4096 && sudo nixos-rebuild switch --flake ~/nix#${hostname} -v";
      } cfg.extraAliases;

      shellAbbrs = { # todo: mkif xclip in pkgs
        "2clip" = "xclip -selection clipboard";
      };

      functions = {
        "fish_greeting" = "${(pkgs.fortune.override { withOffensive = true; })}/bin/fortune";
        "fish_prompt" = ''
          # name: Informative Vcs
          # author: Mariusz Smykula <mariuszs at gmail.com>

          # function fish_prompt --description 'Write out the prompt'
              set -l last_pipestatus $pipestatus
              set -lx __fish_last_status $status # Export for __fish_print_pipestatus.

              if not set -q __fish_git_prompt_show_informative_status
                  set -g __fish_git_prompt_show_informative_status 1
              end
              if not set -q __fish_git_prompt_hide_untrackedfiles
                  set -g __fish_git_prompt_hide_untrackedfiles 1
              end
              if not set -q __fish_git_prompt_color_branch
                  set -g __fish_git_prompt_color_branch magenta --bold
              end
              if not set -q __fish_git_prompt_showupstream
                  set -g __fish_git_prompt_showupstream informative
              end
              if not set -q __fish_git_prompt_color_dirtystate
                  set -g __fish_git_prompt_color_dirtystate blue
              end
              if not set -q __fish_git_prompt_color_stagedstate
                  set -g __fish_git_prompt_color_stagedstate yellow
              end
              if not set -q __fish_git_prompt_color_invalidstate
                  set -g __fish_git_prompt_color_invalidstate red
              end
              if not set -q __fish_git_prompt_color_untrackedfiles
                  set -g __fish_git_prompt_color_untrackedfiles $fish_color_normal
              end
              if not set -q __fish_git_prompt_color_cleanstate
                  set -g __fish_git_prompt_color_cleanstate green --bold
              end

              set -l color_cwd
              set -l suffix
              if functions -q fish_is_root_user; and fish_is_root_user
                  if set -q fish_color_cwd_root
                      set color_cwd $fish_color_cwd_root
                  else
                      set color_cwd $fish_color_cwd
                  end
                  set suffix '#'
              else
                  set color_cwd $fish_color_cwd
                  set suffix '$'
              end

              # PWD
              set_color $color_cwd
              echo -n (prompt_pwd)
              set_color normal

              printf '%s ' (fish_vcs_prompt)

              set -l status_color (set_color $fish_color_status)
              set -l statusb_color (set_color --bold $fish_color_status)
              set -l prompt_status (__fish_print_pipestatus "[" "]" "|" "$status_color" "$statusb_color" $last_pipestatus)
              echo -n $prompt_status
              set_color normal

              echo -n "$suffix "
          # end
        '';
      };
    };
  };
}