man.vim: Ignore $MANWIDTH, use soft wrap #9023

fix #9017
close #9023

runtime/autoload/man.vim

@@ -149,8 +149,9 @@ function! s:system(cmd, ...) abort
 endfunction
 
 function! s:get_page(path) abort
-  " Respect $MANWIDTH or default to window width.
-  let manwidth = empty($MANWIDTH) ? winwidth(0) : $MANWIDTH
+  " Disable hard-wrap by setting $MANWIDTH to a high value.
+  " Use soft wrap instead (ftplugin/man.vim sets 'wrap', 'breakindent').
+  let manwidth = 9999
   " Force MANPAGER=cat to ensure Vim is not recursively invoked (by man-db).
   " http://comments.gmane.org/gmane.editors.vim.devel/29085
   " Set MAN_KEEP_FORMATTING so Debian man doesn't discard backspaces.

runtime/ftplugin/man.vim

@@ -22,6 +22,8 @@ setlocal noexpandtab
 setlocal tabstop=8
 setlocal softtabstop=8
 setlocal shiftwidth=8
+setlocal wrap
+setlocal breakindent
 
 setlocal nonumber
 setlocal norelativenumber
@@ -31,6 +33,8 @@ setlocal nolist
 setlocal nofoldenable
 
 if !exists('g:no_plugin_maps') && !exists('g:no_man_maps')
+  nnoremap <silent> <buffer> j          gj
+  nnoremap <silent> <buffer> k          gk
   nnoremap <silent> <buffer> gO         :call man#show_toc()<CR>
   nnoremap <silent> <buffer> <C-]>      :Man<CR>
   nnoremap <silent> <buffer> K          :Man<CR>