{ config, lib, pkgs, ... }:
let
  cfg = config.my.home.shell;
  swayEnabled = config.my.home.wm.windowManager == "sway";
  aliases = config.my.home.shell.aliases;
in
{
  config = lib.mkIf (cfg.name == "fish") {
    programs.fish = {
      enable = true;
      shellAliases = aliases;
      interactiveShellInit = ''
        set fish_greeting

        # Tmux on terminal start, unless we're in a SSH connection
        if status is-interactive
          if test -z "$SSH_CONNECTION"
            if not tmux has-session 2>/dev/null; or test -z "$TMUX"
              exec tmux new-session -A -s 0
            end
          end
        end

        # I don't know why I need to do this, but otherwise I can't
        # build rust packages with `cargo build' if it's not set ...
        set -Ux PKG_CONFIG_PATH "${pkgs.openssl.dev}/lib/pkgconfig"
      '';
      loginShellInit = lib.mkIf swayEnabled ''
        if test -z "$DISPLAY"; and test (tty) = "/dev/tty1"
          exec sway
        end
      '';
    };
    xdg.configFile."fish/functions" = {
      source = ./functions;
      recursive = true;
    };
  };
}