Type 0 to show relative line numbers for the next command

Complaints & Improvements
6 
def switch-number-line -params .. %{
    try %{ remove-highlighter window/number_lines }
    add-highlighter window/number_lines number-lines %arg{@}
}

hook global NormalKey 0 'switch-number-line -relative'
hook global NormalKey \D.* 'switch-number-line'
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