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" Vim plugin for using Vim as manpager.
" Maintainer: Enno Nagel <ennonagel+vim@gmail.com>
" Last Change: 2022 Oct 17
if exists('g:loaded_manpager_plugin')
finish
endif
let g:loaded_manpager_plugin = 1
" Set up the current buffer (likely read from stdin) as a manpage
command MANPAGER call s:ManPager()
function s:ManPager()
" global options, keep these to a minimum to avoid side effects
if &compatible
set nocompatible
endif
if exists('+viminfofile')
set viminfofile=NONE
endif
syntax on
" Make this an unlisted, readonly scratch buffer
setlocal buftype=nofile noswapfile bufhidden=hide nobuflisted readonly
" Ensure text width matches window width
setlocal foldcolumn& nofoldenable nonumber norelativenumber
" In case Vim was invoked with -M
setlocal modifiable
" Emulate 'col -b'
exe 'silent! keepj keepp %s/\v(.)\b\ze\1?//e' .. (&gdefault ? '' : 'g')
" Remove ansi sequences
exe 'silent! keepj keepp %s/\v\e\[%(%(\d;)?\d{1,2})?[mK]//e' .. (&gdefault ? '' : 'g')
" Remove empty lines above the header
call cursor(1, 1)
let n = search(".*(.*)", "c")
if n > 1
exe "1," . n-1 . "d"
endif
" Finished preprocessing the buffer, prevent any further modifications
setlocal nomodified nomodifiable
" Set filetype to man even if ftplugin is disabled
setlocal filetype=man
runtime ftplugin/man.vim
endfunction
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