Custom conceal rules

[Fireond]

I have learned the command g:vimtex_syntax_custom_cmds but it seems it cannot support options for args and custom argstyle. For example, I want to conceal \ket{\psi} to |ψ>, conceal \bra{A\varphi} to <Aφ| (conceal \ket{}, \bra{}... commands to braket like. Thanks!

[Fireond]

Also I wonder if it is possible to change concealchar key to concealstring key, say if I want to conceal \rank A to simply rank A, but the char limit the concealment to only one word.

[lervag]

I have learned the command g:vimtex_syntax_custom_cmds but it seems it cannot support options for args and custom argstyle. For example, I want to conceal \ket{\psi} to |ψ>, conceal \bra{A\varphi} to <Aφ| (conceal \ket{}, \bra{}... commands to braket like. Thanks!

What you are asking for is unfortunately a much more complicated conceal. It is possible by use of some hacks. I'll see if I can make a function that generalizes this for commands like \cmd{arg} so that we can have it replaced with XargY where X and Y are single characters that are provided as arguments.

Also I wonder if it is possible to change concealchar key to concealstring key, say if I want to conceal \rank A to simply rank A, but the char limit the concealment to only one word.

No; VimTeX uses the legacy syntax engine and it does not have the concept of a concealstring. See :help syn-cchar for information on what is used for conceals by VimTeX.

[lervag]

I've pushed an update that may resolve this. Please see :help vimtex_syntax_custom_cmds_with_concealed_delims and let me know what you think.

[Fireond]

Thanks! But it seems this command not work well on my neovim: I type \ket{x} but it just conceal to {x}, and I just use the example config. I havn't found the cause.

[lervag]

Sorry, my mistake. I've pushed a new update that I think works better.

[Fireond]

It works! But when the containing args have {}, like \ket{\psi_{i}}, it would fail. I don't know whether there are techniques that can detect braces to avoid this error.

[lervag]

Ah, yes. That is a much harder problem, because for the conceals to work, we need to match the region start and region end with the concealed groups. This means that we need the keepend argument for the syntax region command, and then we get the problem you mention now.

The example you give is trivial, though, because you could write it as \ket{\psi_i}; but your point is still valid because you might want \ket{\psi_{i+1}}.

[lervag]

I think I found another way to do it. Please update and test again.