def list_keys(pymux, variables):
    """
    Display all configured key bindings.
    """
    # Create help string.
    result = []

    for k, custom_binding in pymux.key_bindings_manager.custom_bindings.items():
        needs_prefix, key = k

        result.append('bind-key %3s %-10s %s %s' % (
            ('-n' if needs_prefix else ''), key, custom_binding.command,
            ' '.join(map(wrap_argument, custom_binding.arguments))))

    # Display help in pane.
    result = '\n'.join(sorted(result))
    pymux.get_client_state().layout_manager.display_popup('list-keys', result)
Display all configured key bindings.