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-rw-r--r--runtime/plugin/manpager.vim51
1 files changed, 51 insertions, 0 deletions
diff --git a/runtime/plugin/manpager.vim b/runtime/plugin/manpager.vim
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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