actions_auth_redirect_if_signed_in.cr

module Auth::RedirectIfSignedIn
  macro included
    include Auth::SkipRequireSignIn
    before redirect_if_signed_in
    # Most notably, this is removed everywhere. All actions now depend on a current_user.
    # unexpose current_user
  end
  
  # ...

  def current_user
  end
end

actions_mixins_auth_session_management.cr

module SessionManagement
  @user : User?
  
  # ...

  def current_user?
    @user ||= begin
      # #get? instead of #get
      if id = session.get? SESSION_KEY
        UserQuery.find id
      end
    end
  end
end

pages_guest_layout.cr

abstract class GuestLayout < Layout
  # nothing in this file except the 'needs'
  needs current_user : User?
end

pages_layout.cr

abstract class Layout
  # ...
  def login_button
    li class: "nav-item" do
      # @current_user will be a User? when using GuestLayout, and a User when using MainLayout
      if @current_user
        link "Log Out", to: Session::Delete, class: "nav-link"
      else
        link "Log In", to: Session::New, class: "nav-link"
      end
    end
  end
end

pages_main_layout.cr

abstract class MainLayout < Layout
  # nothing in this file except the 'needs'
  needs current_user : User
end