runtime/ftplugin/vim.vim

" Vim filetype plugin
" Language:	Vim
" Maintainer:	Bram Moolenaar <Bram@vim.org>
" Last Change:	2022 Nov 27

" 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< include< define<
    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

" Comments starts with # in Vim9 script.  We have to guess which one to use.
if "\n" .. getline(1, 10)->join("\n") =~# '\n\s*vim9\%[script]\>'
  setlocal commentstring=#%s
else
  setlocal commentstring=\"%s
endif

" Set 'comments' to format dashed lists in comments, both in Vim9 and legacy
" script.
setlocal com=sO:#\ -,mO:#\ \ ,eO:##,:#,sO:\"\ -,mO:\"\ \ ,eO:\"\",:\"

" set 'include' to recognize import commands
setlocal include=\\v^\\s*import\\s*(autoload)?

" set 'define' to recognize export commands
setlocal define=\\v^\\s*export\\s*(def\|const\|var\|final)

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

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]\\|\(export\s\+\)\?def\)\>', "bW")<CR>
  vnoremap <silent><buffer> [[ m':<C-U>exe "normal! gv"<Bar>call search('^\s*\(fu\%[nction]\\|\(export\s\+\)\?def\)\>', "bW")<CR>
  nnoremap <silent><buffer> ]] m':call search('^\s*\(fu\%[nction]\\|\(export\s\+\)\?def\)\>', "W")<CR>
  vnoremap <silent><buffer> ]] m':<C-U>exe "normal! gv"<Bar>call search('^\s*\(fu\%[nction]\\|\(export\s\+\)\?def\)\>', "W")<CR>
  nnoremap <silent><buffer> [] m':call search('^\s*end\(f\%[unction]\\|\(export\s\+\)\?def\)\>', "bW")<CR>
  vnoremap <silent><buffer> [] m':<C-U>exe "normal! gv"<Bar>call search('^\s*end\(f\%[unction]\\|\(export\s\+\)\?def\)\>', "bW")<CR>
  nnoremap <silent><buffer> ][ m':call search('^\s*end\(f\%[unction]\\|\(export\s\+\)\?def\)\>', "W")<CR>
  vnoremap <silent><buffer> ][ m':<C-U>exe "normal! gv"<Bar>call search('^\s*end\(f\%[unction]\\|\(export\s\+\)\?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\>,'
  " Ignore syntax region commands and settings, any 'en*' would clobber
  " if-endif.
  " - set spl=de,en
  " - au! FileType javascript syntax region foldBraces start=/{/ end=/}/ …
  let b:match_skip = 'synIDattr(synID(line("."),col("."),1),"name")
        \ =~? "comment\\|string\\|vimLetHereDoc\\|vimSynReg\\|vimSet"'
endif

let &cpo = s:cpo_save
unlet s:cpo_save

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