dotfiles/hosts/modules/bashistrans.nix

{pkgs, ...}: {
  # I want to use fish as my login shell but it always goes terrible
  # cause it isn't POSIX compliant, so instead Bash is my login and
  # will just exec fish (^-^)
  programs = {
    fish.enable = true;

    bash = {
      blesh.enable = false; # ble.sh replacement for GNU readline
      completion.enable = true;

      interactiveShellInit = ''
        # help bash transition into a beautiful fish!
        if [[ -z $CRY_BASH_IS_TRANS ]]
        then
          if [[ $(${pkgs.procps}/bin/ps --no-header --pid=$PPID --format=comm) != "fish" && -z ''${BASH_EXECUTION_STRING} ]]
          then
            shopt -q login_shell && LOGIN_OPTION='--login' || LOGIN_OPTION=""
            exec ${pkgs.fish}/bin/fish $LOGIN_OPTION
          fi
        fi
        # bash is trans now! (no more transitioning required)
        export CRY_BASH_IS_TRANS=true
      '';
    };
  };
}