neovim/runtime/ftplugin/vim.vim

" Vim filetype plugin
" Language:	Vim
" Maintainer:	The Vim Project <https://github.com/vim/vim>
" Last Change:	2023 Aug 10
" Former Maintainer:	Bram Moolenaar <Bram@vim.org>

" Only do this when not done yet for this buffer
if exists("b:did_ftplugin")
  finish
endif

" Don't load another plugin for this buffer
let b:did_ftplugin = 1

let s:cpo_save = &cpo
set cpo&vim

if !exists('*VimFtpluginUndo')
  func VimFtpluginUndo()
    setl fo< isk< com< tw< commentstring< keywordprg<
    if exists('b:did_add_maps')
      silent! nunmap <buffer> [[
      silent! vunmap <buffer> [[
      silent! nunmap <buffer> ]]
      silent! vunmap <buffer> ]]
      silent! nunmap <buffer> []
      silent! vunmap <buffer> []
      silent! nunmap <buffer> ][
      silent! vunmap <buffer> ][
      silent! nunmap <buffer> ]"
      silent! vunmap <buffer> ]"
      silent! nunmap <buffer> ["
      silent! vunmap <buffer> ["
     endif
    unlet! b:match_ignorecase b:match_words b:match_skip b:did_add_maps
  endfunc
endif

let b:undo_ftplugin = "call VimFtpluginUndo()"

" Set 'formatoptions' to break comment lines but not other lines,
" and insert the comment leader when hitting <CR> or using "o".
setlocal fo-=t fo+=croql

" To allow tag lookup via CTRL-] for autoload functions, '#' must be a
" keyword character.  E.g., for netrw#Nread().
setlocal isk+=#

" Use :help to lookup the keyword under the cursor with K.
setlocal keywordprg=:help

" if "\n" .. getline(1, 10)->join("\n") =~# '\n\s*vim9\%[script]\>'
if "\n" .. join(getline(1, 10), "\n") =~# '\n\s*vim9\%[script]\>'
  " Set 'comments' to format dashed lists in comments
  setlocal com=sO:#\ -,mO:#\ \ ,eO:##,:#
  " Comments starts with # in Vim9 script
  setlocal commentstring=#%s
else
  setlocal com=sO:\"\ -,mO:\"\ \ ,eO:\"\",:\"
  " Comments starts with a double quote in legacy script
  setlocal commentstring=\"%s
endif


" Format comments to be up to 78 characters long
if &tw == 0
  setlocal tw=78
endif

" Prefer Vim help instead of manpages.
setlocal keywordprg=:help

if !exists("no_plugin_maps") && !exists("no_vim_maps")
  let b:did_add_maps = 1

  " Move around functions.
  nnoremap <silent><buffer> [[ m':call search('^\s*\(fu\%[nction]\\|def\)\>', "bW")<CR>
  vnoremap <silent><buffer> [[ m':<C-U>exe "normal! gv"<Bar>call search('^\s*\(fu\%[nction]\\|def\)\>', "bW")<CR>
  nnoremap <silent><buffer> ]] m':call search('^\s*\(fu\%[nction]\\|def\)\>', "W")<CR>
  vnoremap <silent><buffer> ]] m':<C-U>exe "normal! gv"<Bar>call search('^\s*\(fu\%[nction]\\|def\)\>', "W")<CR>
  nnoremap <silent><buffer> [] m':call search('^\s*end\(f\%[unction]\\|def\)\>', "bW")<CR>
  vnoremap <silent><buffer> [] m':<C-U>exe "normal! gv"<Bar>call search('^\s*end\(f\%[unction]\\|def\)\>', "bW")<CR>
  nnoremap <silent><buffer> ][ m':call search('^\s*end\(f\%[unction]\\|def\)\>', "W")<CR>
  vnoremap <silent><buffer> ][ m':<C-U>exe "normal! gv"<Bar>call search('^\s*end\(f\%[unction]\\|def\)\>', "W")<CR>

  " Move around comments
  nnoremap <silent><buffer> ]" :call search('^\(\s*".*\n\)\@<!\(\s*"\)', "W")<CR>
  vnoremap <silent><buffer> ]" :<C-U>exe "normal! gv"<Bar>call search('^\(\s*".*\n\)\@<!\(\s*"\)', "W")<CR>
  nnoremap <silent><buffer> [" :call search('\%(^\s*".*\n\)\%(^\s*"\)\@!', "bW")<CR>
  vnoremap <silent><buffer> [" :<C-U>exe "normal! gv"<Bar>call search('\%(^\s*".*\n\)\%(^\s*"\)\@!', "bW")<CR>
endif

" Let the matchit plugin know what items can be matched.
if exists("loaded_matchit")
  let b:match_ignorecase = 0
  " "func" can also be used as a type:
  "   var Ref: func
  " or to list functions:
  "   func name
  " require a parenthesis following, then there can be an "endfunc".
  let b:match_words =
	\ '\<\%(fu\%[nction]\|def\)!\=\s\+\S\+\s*(:\%(\%(^\||\)\s*\)\@<=\<retu\%[rn]\>:\%(\%(^\||\)\s*\)\@<=\<\%(endf\%[unction]\|enddef\)\>,' ..
	\ '\<\%(wh\%[ile]\|for\)\>:\%(\%(^\||\)\s*\)\@<=\<brea\%[k]\>:\%(\%(^\||\)\s*\)\@<=\<con\%[tinue]\>:\%(\%(^\||\)\s*\)\@<=\<end\%(w\%[hile]\|fo\%[r]\)\>,' ..
	\ '\<if\>:\%(\%(^\||\)\s*\)\@<=\<el\%[seif]\>:\%(\%(^\||\)\s*\)\@<=\<en\%[dif]\>,' ..
	\ '{:},' ..
	\ '\<try\>:\%(\%(^\||\)\s*\)\@<=\<cat\%[ch]\>:\%(\%(^\||\)\s*\)\@<=\<fina\%[lly]\>:\%(\%(^\||\)\s*\)\@<=\<endt\%[ry]\>,' ..
	\ '\<aug\%[roup]\s\+\%(END\>\)\@!\S:\<aug\%[roup]\s\+END\>,' ..
	\ '\<class\>:\<endclass\>,' ..
	\ '\<inte\%[rface]\>:\<endinterface\>,' ..
	\ '\<enu\%[m]\>:\<endenum\>,'

  " Ignore syntax region commands and settings, any 'en*' would clobber
  " if-endif.
  " - set spl=de,en
  " - au! FileType javascript syntax region foldBraces start=/{/ end=/}/ …
  " Also ignore here-doc and dictionary keys (vimVar).
  let b:match_skip = 'synIDattr(synID(line("."), col("."), 1), "name")
	\ =~? "comment\\|string\\|vimSynReg\\|vimSet\\|vimLetHereDoc\\|vimVar"'
endif

let &cpo = s:cpo_save
unlet s:cpo_save

" removed this, because 'cpoptions' is a global option.
" setlocal cpo+=M		" makes \%( match \)