[vim/vim] matchit: match_words in ftplugin/tex.vim (#1052)

[Konfekt]

How about replacing

if exists("loaded_matchit")
  let b:match_words .= ',\\begin\s*\({\a\+\*\=}\):\\end\s*\1'
endif " exists("loaded_matchit")

by

if exists("loaded_matchit")
  setlocal matchpairs-=<:>
  let b:match_words = &l:matchpairs .
      \ ',' . '\%(^\|[ (]\)\@<=\$\$\?' . ':' . '\$\?\$\%($\|[ ).\,;\:?!\-]\)' .
      \ ',' . '\%(^\s*\)\@<=\\begin{\w\+\*\?}' . ':' . '\%(^\s*\)\@<=\\end{\w\+\*\?}'

For example, the regex

\\begin\s*\({\a\+\*\=}\):\\end\s*\1

does not allow for indented environments such as

  \begin{itemize}
    ...
  \end{itemize}

Regarding the matching of opening and closing $ ... $, this will never
be possible by a mere regex, but the above regex is a pragmatic
work-around that works if certain natural conventions are followed.

This mail was sent to Benji Fisher, the maintainer of the $VIMRUNTIME/ftplugin/tex.vim file the March 2, but yet no response.

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[dkearns]

dkearns left a comment (vim/vim#1052)

@Konfekt, are you willing to vouch for your younger self?

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[Enno]

Konfekt left a comment (vim/vim#1052)

I've relatively recently updated this on Stack Exchange to read

let b:match_words = get(b:, 'match_words', &l:matchpairs) .
      \ ',' . '\%(^\|[ (/]\)\zs\\(' . ':' . '\\)\ze\%($\|[ )/.\,;\:?!\-]\)' .
      \ ',' . '\%(^\|[ (/]\)\zs\\\[' . ':' . '\\\]\ze\%($\|[ )/.\,;\:?!\-]\)' .
      \ ',' . '\%(^\|[ (/]\)\zs\$[^$ ]' . ':' . '[^$ ]\zs\$\ze\%($\|[ )/.\,;\:?!\-]\)' .
      \ ',' . '\%(^\|[ (/]\)\zs\$\$' . ':' . '\$\$\ze\%($\|[ )/.\,;\:?!\-]\)' .
      \ ',' . '^\s*\zs\\begin{\([^} \t]\+\)}' . ':' . '\%(^\s*\)\zs\\end{\1}'

and it has been working well for all my purposes. Here's a supposedly more reliable full-fledged plugin even older than this thread. I didn't yet receive a reply by @benjifisher though. I vouch for its inclusion into ftplugin/tex.vim. Thank you for reviving this @dkearns

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