Add unicode-math support for \sym- style command

[One-In-Dark]

Is your feature request related to a problem? Please describe it.
There's no way to add conceal for unicode-math standard commands \symbb etc. even by #1972 custom conceal methods.

Describe the solution you'd like
For the simplicity of implementation, I would like the corresponding commands (e.g. \symbb to \mathbb, \symit to \mathit) to be concealed alike. Maybe in a individual syntax package for unicode-math.

Describe alternatives you've considered
A more general way is to allow users to add this correspondence manually, as is mentioned in the previous issue.

Additional Info
The unicode-math package commands:

[lervag]

For the simplicity of implementation, I would like the corresponding commands (e.g. \symbb to \mathbb, \symit to \mathit) to be concealed alike. Maybe in a individual syntax package for unicode-math.

Ok, sounds reasonable. It would be a great help if you can create a table of examples, preferably with the first column being the typed commands and the second column showing or explaining how it should look.

The image you posted seems to indicate that this is really just adding synonyms to existing commands according to this table:

Command	Synonym
\symnormal	\mathnormal
\symliteral
\symbfsf	\mathbfsf
\symbfup	\mathbfup
\symbfit	\mathbfit
\symbb	\mathbb
\symbbit	\mathbbit
\symcal	\mathcal
\symbfcal	\mathbfcal
\symsecr	\mathscr
\symbfser	\mathbfscr
\symfrak	\mathfrak
\symbffrak	\mathbffrak
\symsfup	\mathsfup
\symbfsfup	\mathbfsfup
\symsfit	\mathsfit
\symbfsfit	\mathbfsfit

But it is unclear how \symliteral should behave, and I also don't think we currently support all of those \math… variants.

A more general way is to allow users to add this correspondence manually, as is mentioned in the previous issue.

It's hard for me to comment this without fully understanding what you want. If you provide the examples I'm asking for it will be easier to fully understand and then considering the options for solving this.

[One-In-Dark]

Thanks for the timely reply!

The image you posted seems to indicate that this is really just adding synonyms to existing commands according to this table:

Yes indeed, despite 2 typos (I've marked them with !). These commands work just as their name suggests.

Five "standard" commands are missed by me. I've added them now.

Command	Synonym	Eg
\symnormal	\mathnormal
\symbfsf	\mathbfsf	𝘼
\symbfup	\mathbfup
\symbfit	\mathbfit	𝑨
\symbb	\mathbb
\symbbit	\mathbbit	ⅅⅆⅇⅈⅉ
\symcal	\mathcal
\symbfcal	\mathbfcal	𝓐
\symsecr(!)	\mathscr
\symbfser(!)	\mathbfscr	𝓐
\symfrak	\mathfrak
\symbffrak	\mathbffrak	𝕬
\symsfup	\mathsfup	𝖠𝖡𝖼𝖽
\symbfsfup	\mathbfsfup	𝗔
\symsfit	\mathsfit	𝘈𝘉𝘤𝘥
\symbfsfit	\mathbfsfit	𝘼
Missed
\symbf	\mathbf
\symit	\mathit
\symup	\mathup
\symsf	\mathsf
\symtt	\mathtt

I also don't think we currently support all of those \math… variants.

I cannot find unicode of all variants, either. 😢 For those variants I can only find unicode character A.

But it is unclear how \symliteral should behave

Given that unicode-math will convert all stylish variants (unicode) to some certain style. (Seemingly so.)

I don't know how it should be seen as some style… maybe we could leave it un-concealed?

[One-In-Dark]

A more general way is to allow users to add this correspondence manually, as is mentioned in the previous issue.

Sorry for vagueness. For example if no exact \symbbit unicode concealing is applicable, maybe it's a good idea to allow users to define it to resemble \mathbb(\symbb)?

[One-In-Dark]

BTW I would appreciate it if some more commands provided by unicode-math can be added, as a syntax package:

Command	Conceal
\increment	∆
\mbfnabla	𝛁

[lervag]

Sorry for the delay, busy days here.

Now, my understanding is that we want to add support for the unicode-math package such that the following commands will work similarly to their synonyms in the following table. I'm only including the commands whose synonyms are actually handled by VimTeX as of now:

Command	Synonym	Eg
\symbb	\mathbb	𝔸
\symfrak	\mathfrak	𝔄
\symcal	\mathcal	𝓐
\symscr	\mathscr	𝓐
\symbf	\mathbf	bold font
\symit	\mathit	italic font
\symbfit	\mathbfit	bold italic font

In addition, I'll add the conceals you mention for \increment → ∆ and \mbfnabla → 𝛁.

We may want to extend things beyond this as well, but let's start here. Ok? If we extend, then we might want to also extend the support for the \math… variants first.

Is this OK, at least as a start?

A more general way is to allow users to add this correspondence manually, as is mentioned in the previous issue.

Sorry for vagueness. For example if no exact \symbbit unicode concealing is applicable, maybe it's a good idea to allow users to define it to resemble \mathbb(\symbb)?

Hmm, yes, but I think it is more work than I want to do right now. It is easier to instead add partial support that benefits all.

[One-In-Dark]

Is this OK, at least as a start?

Yes, thanks for the consideration! Maybe adding the support of \symbfit can be easily done as well, since g:vimtex_syntax_custom_cmds has the similar functionality?

As a reminder, the spelling of \symsecr in the table should be \symscr.

[lervag]

Is this OK, at least as a start?

Yes, thanks for the consideration! Maybe adding the support of \symbfit can be easily done as well, since g:vimtex_syntax_custom_cmds has the similar functionality?

Yes, ok - I'll add both variants then.

[lervag]

Can you update and test how things work for you now?

[One-In-Dark]

Can you update and test how things work for you now?

Working perfectly. Greatly impressed for your remarkable efficiency!

[lervag]

Great, very glad to hear it! :)