Conceal on NeoVim not working

[ignamartinoli]

Description

I tried to set the concealment as shown in this guide with the following entries in the package configuration file ~/.config/nvim/lua/plugins/vimtex.lua:

local g = require 'utils'.g

g.tex_conceal = 'abdmg'
g.vimtex_view_method = 'zathura'
g.vimtex_toc_config = {
	name = 'ToC',
	layers = { 'content', 'todo', 'include' },
	show_help = false
}

After that I created a LaTeX file to try it out but unsuccessfully.

Steps to reproduce

1. Open a LaTeX file with Neovim
2. Type:

\documentclass{article}

\usepackage{amsmath}

\begin{document}
	\section{A}
		\begin{align}
			\in \cdot
		\end{align}
\end{document}

Expected behavior

Seeing the concealment

Actual behavior

The concealment isn't working

Do you use a latexmkrc file?

Yes

VimtexInfo

System info:
  OS: Gentoo Base System release 2.8
  Vim version: NVIM v0.8.0-dev+11-gd3121f1e6-dirty
  Has clientserver: true
  Servername: /tmp/nvimnv2zo3/0

VimTeX project: doe
  base: doe.tex
  root: /home/sicro/Code/LaTeX
  tex: /home/sicro/Code/LaTeX/doe.tex
  main parser: current file verified
  document class: article
  packages: amsmath
  compiler: latexmk
    engine: -pdf
    options:
      -verbose
      -file-line-error
      -synctex=1
      -interaction=nonstopmode
    build_dir: output
    callback: 1
    continuous: 1
    executable: latexmk
  viewer: Zathura
    xwin id: 0
  qf method: LaTeX logfile

[nullchilly]

Conceal doesn't work with treesitter, disable it :TSBufDisable highlight

Related "issue": #1968

[lervag]

Thanks, @nullchilly, I believe you are quite right.

I'm curious if there is any way for me to detect this from VimTeX so that we can warn the user?

By the way, @ignamartinoli: there is no reason to set g.tex_conceal for VimTeX. Also, notice that you do need set conceallevel=1 or set conceallevel=2. You should read :help conceallevel and :help concealcursor.

[ignamartinoli]

@lervag Hi, I forgot to mention that I have conceallevel setted on my ~/.config/nvim/after/ftplugin/tex.lua:

local g   = require 'utils'.g
local map = require 'utils'.map
local opt = require 'utils'.opt
local loc = require 'utils'.loc

opt.shiftwidth = 2
opt.softtabstop = 2
opt.tabstop = 2

g.tex_conceal = 'abdmgs'
loc.conceallevel = 1

loc.spell = true
opt.spelllang = 'en,es'

map('i', '<C-s>', [[<C-g>u<Esc>[s1z=`]a<c-g>u]])

When I deactivated TreeSitter the concealment actually worked so I guess that was the issue. Still it would be cool to see TreeSitter support in the future. Thanks everyone for the help

[lervag]

I've pushed an update that

1. warns people who are using Tree-sitter for highlighting (unless they disable VimTeX's syntax highlighting), and
2. improves documentation of VimTeX vs Tree-sitter (see :help vimtex-faq-treesitter).

[lervag]

@ignamartinoli Nice to know your problem is settled! Notice, again, that you don't need g:tex_conceal. You can control the VimTeX conceal settings with :help g:vimtex_syntax_conceal.

Still it would be cool to see TreeSitter support in the future.

I'm sorry to say that I will most likely never go there. I'm satisfised with the current implementation and see no specific need to rewrite everything in Tree-sitter. But perhaps someone will do it someday; that is not unlikely. And I will be glad to update VimTeX (both code and docs) to better integrate with Tree-sitter if/when the highlighter is good enough!

[lervag]

For the general community: Feel free to read the new :help vimtex-faq-treesitter and let me know if you think I'm being imprecise or if you have suggestions for improving the text. (e.g. @clason @krishnakumarg1984)

[krishnakumarg1984]

I did read it. Sounds good to me

[lervag]

Thanks!