conceal support for mathbf

[anntzer]

This is a request for concealing \mathbf similarly to \textbf. Unfortunately, just adding mathbf at https://github.com/lervag/vimtex/blame/master/after/syntax/tex.vim#L31 does not seem to suffice, perhaps due to group nesting?
Thanks in advance.

Minimal working example

Please provide a minimal working LaTeX example, e.g.

\documentclass{minimal}
\begin{document}

\textbf{foo}
$\mathbf{foo}$

\end{document}

Minimal vimrc file

Please provide a minimal vimrc file that reproduces the issue. The following
should often suffice:

set nocompatible

" Load Vimtex
let &rtp  = '~/.vim/plugged/vimtex,' . &rtp
let &rtp .= ',~/.vim/plugged/vimtex/after'

" Load other plugins, if necessary
" let &rtp = '~/path/to/other/plugin,' . &rtp

filetype plugin indent on
syntax enable

" Vimtex options go here
set conceallevel=2
let g:tex_conceal="abdgm"

[lervag]

The problem is that this is within the texMath regions. If you remove the M flag from g:tex_fast (e.g. by setting let g:tex_fast = "bcmprsSvV"), then it will work by adding mathbf to the list in line 31. However, it seems hackish to me, so I am not sure if I want to add it. In particular, I don't quite see the consequences of removing the M flag.

[aquadr]

You can do something like

syntax cluster texMathZoneGroup add=texBoldStyle
syntax cluster texMathMatchGroup add=texBoldStyle
syntax region texBoldStyle matchgroup=texStatement start='\\vect\s*{' end='}' contains=texMathZoneX contained concealends
syntax region texBoldStyle matchgroup=texStatement start='\\boldsymbol\s*{' end='}' contains=texMathZoneX contained concealends

This works well with let g:tex_fast = "M".

[lervag]

Thanks @aquadr, that seems like it should or could work.

Is there a good reason not to add this by default?

Or, perhaps: Do you (either @anntzer or @aquadr or anyone else) have a list of specific math fonts that should be italized or bolded that I could create custom groups for that I would add to the clusters? I guess it does not really make sense to add texBoldStyle to the cluster. I should rather create texMathBoldStyle, add it to the cluster and link it to the texBoldStyle style. What do you think?

[aquadr]

I don't think there is a good reason not to add this by default.

My understanding of vim syntax files is limited... I think creating texMathBoldStyle and linking to texBoldStyle is reasonable (altough variables like $\mathbf{a}$ might have a different syntax highlighting color than ordinary math variables $a$).

Here is a small (surely incomplete) list of commands which could be styled:

\documentclass[]{article}
\usepackage{amsmath}
\usepackage{bm}
\usepackage{fixmath}
\begin{document}
\begin{align}
	a \\
	\textit{a} \\
	\mathit{a} \\
	\mathbf{a} \\
	\mathbold{a} \\
	\boldsymbol{a} \\
	\bm{a} \\
	\pmb{a} \\
	\mathsf{a} \\
	\textsf{a} \\
	\mathrm{a} \\
	\text{a} 
\end{align}
\end{document}

One might argue, wheter \vec{..} or vect{..} should be bold, too :-)

[anntzer]

I don't have any exhaustive list, looks like @aquadr is already doing all the work there.

[lervag]

I've been looking at this and thinking. I've tried to implement it, but to me it does not look quite right. I would have to add options that control it, and the default would be to have it disabled.

Since this is "easily" added on a per user basis by adding the lines suggested by @aquadr to ones after/syntax/tex.vim file, I find it is better to let a user add such customization manually. This helps keep vimtex cleaner and simpler.

[Konfekt]

Just found the two-year old

https://github.com/KeitaNakamura/tex-conceal.vim

that resolves all of this concealing quite well. Perhaps it can be mentioned, or even implemented as an option.

[lervag]

Thanks for the notice! I'll make a comment on this in the docs. I'm not personally a big fan of conceals, and so I don't really feel like adding it to vimtex.

However, if it is a popular opinion that this should be added to vimtex, then I could reconsider (feel free to open a new issue to check if there is such an interest).

[oblitum]

Hi @lervag, I just found tex-conceal.vim and it's really nice, but today vimtex blocks most of it from working. I'm not sure how to make the two play together. There's a simple rendering test on tex-conceal.vim, it works standalone, but with vimtex, almost nothing gets concealed as expected, so it can be stated the two are currently incompatible.

[lervag]

@oblitum Feel free to open a new issue on this topic. Note: I will not do anything to make Vimtex play nice with tex-conceal, but I might consider adding more conceal rules inspired by tex-conceal.