Re: Command z doesn't work

Le mardi 15 novembre 2016 01:03:16 UTC+1, Gary Johnson a écrit :
> On 2016-11-14, Bryan Richter wrote:
>
> > Aha, now I can agree there is room for improvement. The docs should be
> > updated to mention that z<CR> is impacted by 'scrolloff'.
> >
> > That probably should have happened a long time ago, in fact.
> >
> > I would submit a patch, but I'm not set up to be a vim contributor, and
> > I don't have the time to do so right now. Maybe someone else?
> >
> > P.S. I don't use 'scrolloff', so I do not know if there is any other
> > general solution to the mutually incompatible goals of z<CR> and
> > 'scrolloff'.
>
> I don't use 'scrolloff' either. I tried it for a short while and
> not being able to put the cursor in the offset region when I wanted
> to drove me crazy.
>
> However, I do like having some context when jumping. For example,
> when I'm searching for a pattern and I hit 'n' and the cursor jumps
> to the bottom of the window, I like having some idea of the context
> of that line, i.e., what are the following few lines. So I now have
> mappings for n, N and a few other keys so that when jumping around
> in a file using those keys, I always have at least two lines of
> context around the matched line.
>
> Here is the function and some of the mappings that use it, in case
> anyone is interested.
>
> " Leave a little space at the top or bottom of the screen for context when
> " executing 'n' or 'N'.
> "
> nnoremap <silent> n nzv:call AdjCursor()<CR>
> nnoremap <silent> N Nzv:call AdjCursor()<CR>
> function! AdjCursor()
> let l:wh = winheight(0)
> if l:wh <= 2
> return
> elseif l:wh <= 4
> let l:vmargin = 1
> else
> let l:vmargin = 2
> endif
>
> " The algorithm at the bottom of this function has a problem when the
> " match is found on a really long line that wraps many times in the
> " display. I don't know what the correct solution is, so for now we'll
> " just bail if the line wraps.
> "
> if virtcol("$") > &columns
> return
> endif
>
> " When positive, l:scrollup is the number of lines that need to be
> " scrolled up to leave l:vmargin lines between the cursor and the top of
> " the window. Similarly, when positive, l:scrolldown is the number of
> " lines that need to be scrolled down to leave l:vmargin lines between the
> " cursor and the bottom of the window.
>
> let l:scrollup = (l:vmargin + 1) - winline()
> let l:scrolldown = winline() - (l:wh - l:vmargin)
> if l:scrolldown > 0
> exe "normal ".l:scrolldown."\<C-E>"
> elseif l:scrollup > 0
> " Scrolling will have no effect when the first line of the buffer is
> " at the top of the window, but it doesn't cause an error, either, so
> " we won't test for that condition.
> exe "normal ".l:scrollup."\<C-Y>"
> endif
> endfunction
>
> It doesn't address all the cases I'd like it to, such as after an
> initial search with '/' or '?', and it has the side-effect of
> clearing the "search hit BOTTOM, continuing at TOP" message, but it
> addresses the behaviors that annoy me most. It would be nice if
> this behavior could be made part of Vim, say as a 'jumpoff' option,
> but I'm not in a good position to code that, at least not at the
> moment.
>
> Regards,
> Gary

I discovered 'scrolloff' not long ago and liked it. But I was also bothered by the z<CR> behavior.

Since I wanted the line to be really on top of window, but didn't mind if the cursor move, I use the following mapping:

:nnoremap z<CR> :exec line('.')+&scrolloff<CR>z<CR>

Works fine for me, although it doesn't work for the last lines of the buffer.

Regards,
Eric

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