On Thursday, November 18, 2021 at 10:23:32 PM UTC+1 fel...@felipegasper.com
wrote:
>
>
> > On Nov 18, 2021, at 16:06, Tony Mechelynck <antoine.m...@gmail.com>
> wrote:
> >
> > On Wednesday, November 17, 2021 at 4:01:00 PM UTC+1
> fel...@felipegasper.com wrote:
> > Hello,
> >
> > When I set `cols=80` and enable line numbering (`number`), I lose the
> last few columns for code because MacVim uses them for the line numbers.
> >
> > Is it possible to make the `cols` setting account for line numbering, so
> that I get 80 columns for editing code, regardless of whether line
> numbering is on (and how many columns the line numbers themselves need)?
> >
> > Thank you!
> >
> > Cheers,
> > -Felipe Gasper
> >
> > Vim's 'columns' setting includes the line number (if any), whose width
> varies according to how many lines are in the file and on the 'numberwidth'
> setting. No matter which options you set, if you are running Vim in an
> 80-column-wide terminal, you won't be able to get 80 columns for the text
> plus some additional columns for the line number. Otherwise, if your screen
> is wide enough, and your Vim is compiled with +float, you can get the width
> of the linenumber as (untested)
> > &l:nu?(max([&l:numberwidth,floor(log10(line('$')))+2])):0
> > floor(log10(n)) should be one less than the number of decimal digits
> needed to write the number n, and +2 because we add back not only that "one
> less" but also the single empty column between the line number and the
> text.
> >
> > Add the value of the above expression to the desired textwidth (here
> 80), set 'columns' to the sum of both, then check if you got what you
> wanted (because setting 'columns' is limited by the actual available width:
> if I try to set it to 999 it will actually be set to only the number of
> characters that can be displayed onscreen).
>
> Ah, cool!
>
> Is there a vim event I could hook into for “when a line is added or
> removed”?
>
> Thank you!
>
> -FG
I don't see anything obvious. You might want to check the autocommands
described at lines 372 and following of ":help autocmd.txt" (TextChanged,
TextChangedI, etc.) but keep a "saved value" of the number of lines i.e.
line('$') because if it didn't change you can return early. Or you might
set a flag from a 'statusline' setting, but handle it elsewhere because
'statusline' is evaluated very often and for every (split) window.
Best regards,
Tony.
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