shift manpager stuff to plugin

after/syntax/man.vim

-syntax match BACKHIDE '.\b' conceal contained
-syntax match BOLD '\(.\)\b\1' contains=BACKHIDE
-syntax match Underlined '_\b.' contains=BACKHIDE
-highlight link BOLD Constant
-

ftplugin/man.vim

-if exists("b:did_man")
-	finish
-endif
-let b:did_man = 1
-setlocal nolist 
-setlocal readonly
-setlocal buftype=nofile
-setlocal bufhidden=hide
-setlocal noswapfile
-setlocal nomodifiable
-setlocal nowrap
-setlocal conceallevel=3
-setlocal iskeyword+=,_
-setlocal concealcursor=nvic
-
-if !exists("*s:MMan")
-	function! s:MMan()
-		let l:word = substitute(expand('<cword>'), '.\b', '', 'g')
-		if winnr('$') == 1 
-			vsplit
-		endif
-		exec 'Man' l:word
-	endfunction 
-
-	function s:PrepManPager()
-		setlocal modifiable
-		if !empty ($MAN_PN)
-			"silent %! col -b -x
-			%s/.\b//g
-			file $MAN_PN
-		endif
-		setlocal nomodified
-		setlocal nomodifiable
-	endfunction
-endif
-
-"autocmd BufEnter $MAN_PN call PrepManPager()
-nnoremap <buffer> q :q!<CR>
-nnoremap <buffer> <Space> <PageDown>
-nnoremap <buffer> <CR>  :call <SID>MMan()<CR>
-nnoremap <buffer> <c-]>  :call <SID>MMan()<CR>

vimrc

@@ -95,6 +95,7 @@ nnoremap   <Up>        gk
 
 "execute pathogen#infect()
 call plug#begin('~/.vim/plugged')
+Plug 'murukeshm/vim-manpager'
 
 Plug 'vim-scripts/diffchar.vim'
 Plug 'scrooloose/nerdtree'
@@ -169,9 +170,7 @@ let g:ycm_collect_identifiers_from_tags_files = 1
 let g:ycm_seed_identifiers_with_syntax = 1
 let g:ycm_python_binary_path = '/usr/bin/python3'
 
-if !empty($MAN_PN)
-	autocmd StdinReadPost * set ft=man | file $MAN_PN
-elseif @% == "" && getcwd() == "/tmp"
+if empty($MAN_PN) && @% == "" && getcwd() == "/tmp"
 " From http://vi.stackexchange.com/questions/239/
 " with exception for reading manpages
 	try