Motivation for this change

The alias for thefuck is placed in /etc/profile. However shell emulators like zsh or fish don't use these scripts due to known incompatibilities with bash.

Therefore an optional expression which detects which shells are enable in NixOS is needed which configures the alias in all needed shell envs.

I confirmed the change using an expression like this:

{
  zsh = { pkgs, lib, ... }: with lib; {
    programs.zsh.enable = true;
    programs.thefuck.enable = true;
    users.extraUsers.vm = {
      extraGroups = [ "wheel" ];
      password = "vm";
      isNormalUser = true;
      shell = "/run/current-system/sw/bin/zsh";
    };
  };
}

When booting into this generated VM (built with nixos-build-vms) zsh works fine when running fuck on the CLI without complaining about missing aliases.

After that I confirmed that the alias is only in the env scripts for bash and zsh (/etc/static/zshenv) by running grep -R 'fuck' /etc.

Things done

Please check what applies. Note that these are not hard requirements but mereley serve as information for reviewers.

• Tested using sandboxing
  (nix.useSandbox on NixOS,
  or option build-use-sandbox in nix.conf
  on non-NixOS)
• Built on platform(s)
  • NixOS
  • macOS
  • Linux
• Tested via one or more NixOS test(s) if existing and applicable for the change (look inside nixos/tests)
• Tested compilation of all pkgs that depend on this change using nix-shell -p nox --run "nox-review wip"
• Tested execution of all binary files (usually in ./result/bin/)
• Fits CONTRIBUTING.md.