{
  config,
  lib,
  pkgs,
  ...
}:
let
  cfg = config.programs.fish;
in
{
  config = lib.mkIf cfg.enable {
    programs.fish = {
      interactiveShellInit = ''
        set fish_greeting
        fish_vi_key_bindings
      '';
      shellInit = ''
        if test -e $HOME/.nix-profile/etc/profile.d/nix.fish
          source $HOME/.nix-profile/etc/profile.d/nix.fish
        end

        set nix_paths ${lib.concatStringsSep " " config.home.sessionPath}
        set paths_to_export
        for path in $PATH
          if test -d $path && not contains $path $nix_paths
            set paths_to_export $paths_to_export $path
          end
        end
        for path in $nix_paths
          if test -d $path
            set paths_to_export $paths_to_export $path
          end
        end
        set -x PATH $paths_to_export
      '';
      functions.sourceenv = ''
        for line in (cat $argv | grep -v '^#')
          set item (string split -m 1 '=' $line)
          set -gx $item[1] $item[2]
          echo "Exported key $item[1]"
        end
      '';
    };
  };
}