provide-module expand %—
    define-command -hidden -params 1 expand-impl %{
        # param expand or shrink
        evaluate-commands -itersel %sh{
            sel="$kak_selection_desc"
            left=${sel%%,*}
            right=${sel##*,}
            left_d=${left#*.}
            right_d=${right#*.}
            if [ "$left_d" -gt "$right_d" ]; then
                # sel facing back
                if [ "$1" = 'expand' ]; then
                    echo 'execute-keys "H<a-;>L<a-;>"'
                else
                    echo 'execute-keys "L<a-;>H<a-;>"'
                fi
            elif [ "$left_d" -lt "$right_d" ]; then
                # sel facing forward
                if [ "$1" = 'expand' ]; then
                    echo 'execute-keys "L<a-;>H<a-;>"'
                else
                    echo 'execute-keys "H<a-;>L<a-;>"'
                fi
            else
                if [ "$1" = 'expand' ]; then
                    echo 'execute-keys "L<a-;>H<a-;>"'
                else
                    echo 'nop'
                fi
            fi
        }
    }
    define-command expand-selections %{
        expand-impl expand
    }
    define-command shrink-selections %{
        expand-impl shrink
    }
    map global object <a-e> '<esc>: expand-selections<ret>' -docstring 'expand selections'
    map global object <a-s> '<esc>: shrink-selections<ret>' -docstring 'shrink selections'
—