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Current File : //usr/share/vim/vim82/plugin/manpager.vim

" Vim plugin for using Vim as manpager.
" Maintainer: Enno Nagel <ennonagel+vim@gmail.com>
" Last Change: 2020 Aug 05

command! -nargs=0 MANPAGER call s:ManPager() | delcommand MANPAGER

function! s:ManPager()
  set nocompatible
  if exists('+viminfofile')
    set viminfofile=NONE
  endif
  set noswapfile 

  setlocal ft=man
  runtime ftplugin/man.vim
  setlocal buftype=nofile bufhidden=hide iskeyword+=: modifiable

  " Emulate 'col -b'
  silent! keepj keepp %s/\v(.)\b\ze\1?//ge

  " Remove ansi sequences
  silent! keepj keepp %s/\v\e\[%(%(\d;)?\d{1,2})?[mK]//ge

  " Remove empty lines above the header
  call cursor(1, 1)
  let n = search(".*(.*)", "c")
  if n > 1
    exe "1," . n-1 . "d"
  endif
  setlocal nomodified readonly

  syntax on
endfunction