Re: sidescrolloff, but only for long lines?

Stephen Talley wrote:

> Ben Fritz wrote:
>
> > On Wednesday, June 5, 2013 12:31:43 PM UTC-5, Stephen Talley
> > wrote:
> > > I use sidescrolloff to make sure I can see several columns ahead
> > > of the cursor
> > >
> > > on long lines. However, even when a line is short enough to fit
> > > entirely on the
> > >
> > > screen, vim still scrolls even though there is no need to.
> > >
> > > Is there a way to turn off horizontal scrolling when a line
> > > doesn't need it?
> >
> > You could use a CursorMoved autocmd, that checks the line length,
> > and sets or clears the option in response. You may want to use
> > CursorMovedI as well.
>
> Thanks Ben. This seems like the best alternative baring a formal
> vim option to govern this behavior.

In case anyone else is interested, I used this to make sure that
horizontal scrolling never scrolls beyond the end of the line:

augroup AllFiles
autocmd!

" Amend &sidescrolloff based on cursor position
autocmd CursorMoved,CursorMovedI * call UpdateSideScroll()
autocmd END

let g:sidescrolloff = 15

function! UpdateSideScroll()
if &wrap == 0
let inInsert = mode() =~ "[iR]"
let offset = inInsert ? 2 : 1
let vend = virtcol("$")
let vcol = virtcol(".")
let &l:sidescrolloff = min([g:sidescrolloff, vend - vcol - offset])
" echo &l:sidescrolloff
if (!inInsert && vend - vcol < g:sidescrolloff)
normal ze
endif
endif
endfunction

Steve

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