eqref behaviour (referencing completion) on custom command

[Felipe-9]

Description

recently i created a custom command for referencing \usingref{} and i would like for it to behave just like eqref, what changes i can make to autocomplete references just like the original command?

i searched on the original code and found out this file under /vimtex/autoload/vimtex/complete.vim

function! s:completer_ref.complete(regex) dict abort " {{{2
  let l:candidates = self.get_matches(a:regex)

  if self.context =~# '\\eqref'
        \ && !empty(filter(copy(l:candidates), 'v:val.word =~# ''^eq:'''))
    call filter(l:candidates, 'v:val.word =~# ''^eq:''')
  endif

  return l:candidates
endfunction

also in /vimtex/autoload/vimtex/syntax.vim

  syntax match texCmdRefEq nextgroup=texRefEqConcealedArg
        \ conceal skipwhite skipnl "\\eqref\>"
  call vimtex#syntax#core#new_arg('texRefEqConcealedArg', {
        \ 'contains': 'texComment,@NoSpell,texRefEqConcealedDelim',
        \ 'opts': 'keepend contained',
        \ 'matchgroup': '',
        \})
  syntax match texRefEqConcealedDelim contained "{" conceal cchar=(
  syntax match texRefEqConcealedDelim contained "}" conceal cchar=)

Should i copy those substituting \eqref by \usingref? where do i paste it?

i dont want to conceal the command.

[lervag]

Sorry for the slow response!

It's hard to properly understand what you are asking about. The first sentence sort of makes sense, then I get confused, especially when you mention the syntax rules in syntax.vim.

I believe what you are asking for is how to configure VimTeX to allow label completion for custom commands such as your \usingref{}?

A friendly advice is to be more explicit and clear about what you are actually doing here. What is the definition of your custom command?

Now, I'm sorry to say there is currently no way to configure this. That is, the supported completion commands are hard coded; you can see them here:

vimtex/autoload/vimtex/complete.vim

Lines 237 to 242 in b8bb79b

	\ 'patterns' : [
	\ '\v\\v?%(auto|eq|[cC]?%(page)?|labelc)?ref%(\s*\{[^}]*|range\s*\{[^,{}]*%(\}\{)?)$',
	\ '\\hyperref\s*\[[^]]*$',
	\ '\\subref\*\?{[^}]*$',
	\ '\\nameref{[^}]*$',
	\ ],

I'm not very fond of adding more options, so could I ask why you want to make your own custom reference command? There are several packages that may provide something like what you want already, e.g. cleveref.