Folding slow with vimtex

Question

Automatic folding with the vimtex plugin is unbearably slow.

Is there anything I can do to speed this up? I tried installing the fastfold plugin but that did nothing I could notice.

Do you want manual and persistent folds? Or do you want to speed up vimtex? These are two different questions... — Martin Tournoij, Feb 09 '16 at 12:19
@Carpetsmoker, I would prefer to speed up, but if that is not possible, I would like persistent manual folds. sorry I didn't know asking two related qq. in one was a problem. — Toothrot, Feb 09 '16 at 12:22
You can save folds over sessions with mkview and loadview. See Can I save folds? — Steve, Feb 09 '16 at 12:25
Okay; I edited your question to only include the vimtex question. For the other one see: Can I save folds? — Martin Tournoij, Feb 09 '16 at 12:31
For marker folding I have the following lines in my ftplugin/tex.vim: setlocal foldmethod=marker, setlocal foldmarker=(fold),(end) and setlocal commentstring=\ %\ %s. In addition to this I use snippets which all have % (fold),% (end) pairs — Steve, Feb 09 '16 at 13:53
@Steve, excellent, I've already started using markers. thanks for the commentstring tip! is there any objective advantege to (fold) over {{{ ? — Toothrot, Feb 09 '16 at 14:09
I think the default snippets file came with % (fold/end) and I got used to it, so I now prefer how it looks. Think that's about it afaik — Steve, Feb 09 '16 at 14:15

score 9 · Accepted Answer · answered Feb 09 '16 at 20:20

9

First: Did you bother to read the vimtex documentation, i.e. :h vimtex-folding? The docs clearly point out that the fold-expr method of folding is slow, and so therefore provides an option g:vimtex_fold_manual which if enabled (set to nonzero value) will set foldmethod=manual, and instead will remap zx and zX to recalculate the folds when necessary (typically not very often).

The fastfold plugin is a very good alternative, as it will automatically ensure that the foldmethod is set to manual. This will also work for other file types, and the plugin provides a set of possibilities for when the folds should be refreshed.

Disclaimer: I am the developer of vimtex.

answered Feb 09 '16 at 20:20

Karl Yngve Lervåg

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sorry, I saw it but didn't understand it. I still have two problems with the package, though (for which thanks): first, that it doesn't show the number of lines in a fold, which I find useful; and secondly that using it it takes quite long to load a file. for these reasons I'll stick to markers, which I discovered today. – Toothrot Feb 09 '16 at 20:54
You can use standard foldtext with set foldtext=, which should show line numbers. Also, I personally don't have any problems with long load times that I've noticed. You could consider to open an issue and explain the problem and how to reproduce. – Karl Yngve Lervåg Feb 10 '16 at 08:29
This worked out of the box for me. Very nice! – Astrid Aug 08 '17 at 00:05
You can try using foldmethod=marker. Of course, then you'd have to use a foldmarker (e.g. {{{,}}} or F{O{L{D,F}O}L}D) in tex documents, but it does make it faster. – mahbubweb May 20 '20 at 20:03
I suggest that you do not use markers for folding tex files, especially if you work together with others, as it makes a lot of unnecessary noise. IMHO, folding in vimtex should be fast enough. I also suggest using vim-FastFold, which is a general purpose and better implementation of the mechanisms provided by g:vimtex_fold_manual. – Karl Yngve Lervåg May 21 '20 at 06:12

Folding slow with vimtex

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