Vim: disable word wrapping for specific lines

Question

I am using :set textwidth=80 to make the Vim editor do hard wrapping automatically. However, sometimes for certain lines within a file (e.g. tables in LaTeX), I do not want Vim to do any hard wrapping automatically. Is there a way to mark certain lines to disable hard wrapping in Vim? Or automatically :set textwidth=0 just for specified lines?

score 2 · Accepted Answer · answered Oct 06 '13 at 12:07

There's nothing out-of-the-box, but you can build a solution with an :autocmd <buffer> on the CursorMoved,CursorMovedI events. On each move of the cursor, you have to check whether you're currently in one of those "certain lines", and modify the local 'textwidth' option accordingly:

autocmd CursorMoved,CursorMovedI <buffer> if IsSpecialLine() | setlocal textwidth=0 | else | setlocal textwidth=80 | endif

Put this into ~/.vim/after/ftplugin/tex.vim. (This requires that you have :filetype plugin on; use of the after directory allows you to override any default filetype settings done by $VIMRUNTIME/ftplugin/tex.vim.) Alternatively, you could define an :autocmd FileType tex autocmd ... directly in your ~/.vimrc, but this tends to become unwieldy once you have many customizations.

For the IsSpecialLine() function, you probably need to match a regular expression on the current line (getline('.') =~# "..."). If you can identify the "certain lines" through syntax highlighting, my OnSyntaxChange plugin can do all the work for you.

Could you please elaborate on the `IsSpecialLine()` function? For example, the line contains `&` without a leading `\ `(i.e. contains `&` but not `\&`). Thank you very much! — Liw, Oct 07 '13 at 00:29
In that case, the body inside that function would be `return getline('.') =~# '\\\@<!&'`. — Ingo Karkat, Oct 07 '13 at 06:26

score 2 · Answer 2 · edited May 23 '17 at 12:08

I've tried Ingo Karkat answer. Although it does work very well and does what the OP asks, I find it distracting (if I have long tables with row hundreds of characters long, there are a lot of shifts up and down when passing over tables) and can slow down a lot vim on big files (the textwidth and wrap are changed for the whole file, so running the autocmd for every cursor movement can be costly).

So I propose a static solution based on the idea that hopefully you have to modify a table as few times as possible. I've added the following to my ftplugin/tex.vim file:

" By default the text is 
let s:textwidth = 90
let &l:textwidth=s:textwidth

" Toggle between "textwidth and wrap" and "textwidth=0 and nowrap".
" When editing a table, can be useful to have all the '&' aligned (using e.g.
" ':Tabularize /&') but without line brakes and wraps. Besides it's very
" annoying when line brakes "happen" while editing.
" As hopefully tables must be edited only from time to time, one can toggle
" wrap and textwidth by hand. 
function! ToggleTwWrap() "{{{
  " if textwidth and wrap is used, then disable them
  if &textwidth > 0 
    let &l:textwidth=0
    setlocal nowrap
  else " otherwise re-enable them
    let &l:textwidth=s:textwidth
    setlocal wrap
  endif
endfunction

So now if I want to edit manually a table I simply do

:call ToggleTwWrap()

to disable wrapping and textwidth and then again when I'm done with the table.

And of course you can create a command or a map

This is a really nice solution! – Daniel Thaagaard Andreasen May 26 '15 at 13:13 — Daniel Thaagaard Andreasen, May 26 '15 at 13:13

score 0 · Answer 3 · answered Oct 06 '13 at 00:50

0

You can certainly set it for specific file types, but I don't think you can change those settings (or any, really) for individual lines.

answered Oct 06 '13 at 00:50

abjuk

3,662
1
13
7

I do have individual `textwidth` settings for different file types. I really like to hard wrap LaTeX source text for easy reading. However, it really messes up the source text of my tables. I really just want to disable hard wrapping for LaTeX tables code. – Liw Oct 06 '13 at 00:57

score 0 · Answer 4 · answered Sep 07 '16 at 16:39

Ingo Karat's answer works but setting textwidth on every single cursor move is too slow. This adapted version will only call setlocal textwidth= if the text width is actually going to change. This speeds things up considerably:

autocmd CursorMoved,CursorMovedI <buffer> if IsSpecialLine() | if &textwidth != 0 | setlocal textwidth=0 | endif | else | if &textwidth != 80 | setlocal textwidth=80 | endif | endif

Vim: disable word wrapping for specific lines

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