ultimate-vim/bundle/vim-commentary/plugin/commentary.vim

" commentary.vim - Comment stuff out
" Maintainer:   Tim Pope <http://tpo.pe/>
" Version:      1.2
" GetLatestVimScripts: 3695 1 :AutoInstall: commentary.vim

if exists("g:loaded_commentary") || &cp || v:version < 700
  finish
endif
let g:loaded_commentary = 1

function! s:surroundings() abort
  return split(substitute(substitute(
        \ get(b:, 'commentary_format', &commentstring)
        \ ,'\S\zs%s',' %s','') ,'%s\ze\S', '%s ', ''), '%s', 1)
endfunction

function! s:go(type,...) abort
  if a:0
    let [lnum1, lnum2] = [a:type, a:1]
  else
    let [lnum1, lnum2] = [line("'["), line("']")]
  endif

  let [l, r] = s:surroundings()
  let uncomment = 2
  for lnum in range(lnum1,lnum2)
    let line = matchstr(getline(lnum),'\S.*\s\@<!')
    if line != '' && (stridx(line,l) || line[strlen(line)-strlen(r) : -1] != r)
      let uncomment = 0
    endif
  endfor

  for lnum in range(lnum1,lnum2)
    let line = getline(lnum)
    if strlen(r) > 2 && l.r !~# '\\'
      let line = substitute(line,
            \'\M'.r[0:-2].'\zs\d\*\ze'.r[-1:-1].'\|'.l[0].'\zs\d\*\ze'.l[1:-1],
            \'\=substitute(submatch(0)+1-uncomment,"^0$\\|^-\\d*$","","")','g')
    endif
    if uncomment
      let line = substitute(line,'\S.*\s\@<!','\=submatch(0)[strlen(l):-strlen(r)-1]','')
    else
      let line = substitute(line,'^\%('.matchstr(getline(lnum1),'^\s*').'\|\s*\)\zs.*\S\@<=','\=l.submatch(0).r','')
    endif
    call setline(lnum,line)
  endfor
  silent doautocmd User CommentaryPost
endfunction

function! s:undo() abort
  let [l, r] = s:surroundings()
  let lnums = [line('.')+1, line('.')-2]
  for [index, dir, bound, line] in [[0, -1, 1, ''], [1, 1, line('$'), '']]
    while lnums[index] != bound && line ==# '' || !(stridx(line,l) || line[strlen(line)-strlen(r) : -1] != r)
      let lnums[index] += dir
      let line = matchstr(getline(lnums[index]+dir),'\S.*\s\@<!')
    endwhile
  endfor
  call s:go(lnums[0], lnums[1])
  silent! call repeat#set("\<Plug>CommentaryUndo")
endfunction

xnoremap <silent> <Plug>Commentary     :<C-U>call <SID>go(line("'<"),line("'>"))<CR>
nnoremap <silent> <Plug>Commentary     :<C-U>set opfunc=<SID>go<CR>g@
nnoremap <silent> <Plug>CommentaryLine :<C-U>set opfunc=<SID>go<Bar>exe 'norm! 'v:count1.'g@_'<CR>
nnoremap <silent> <Plug>CommentaryUndo :<C-U>call <SID>undo()<CR>

if !hasmapto('<Plug>Commentary') || maparg('gc','n') ==# ''
  xmap gc  <Plug>Commentary
  nmap gc  <Plug>Commentary
  nmap gcc <Plug>CommentaryLine
  nmap gcu <Plug>CommentaryUndo
endif

if maparg('\\','n') ==# '' && maparg('\','n') ==# '' && get(g:, 'commentary_map_backslash', 1)
  xmap \\  <Plug>Commentary
  nmap \\  <Plug>Commentary
  nmap \\\ <Plug>CommentaryLine
  nmap \\u <Plug>CommentaryUndo
endif

" vim:set et sw=2: