query all MaySet() options at once

Author: mralusw

plugin/sensible.vim

@@ -26,12 +26,23 @@ else
   endfunction
 endif
 
+" initially gathered using: g/MaySet('/"AY
+let s:mayset_checks = #{ backspace: 1, smarttab: 1, incsearch: 1, laststatus: 1, ruler: 1, wildmenu: 1, scrolloff: 1, sidescroll: 1, sidescrolloff: 1, listchars: 1, autoread: 1, history: 1, tabpagemax: 1, langremap: 1 }
+call filter(s:mayset_checks, { k -> exists('&' . k) })
+let s:mayset_check_str = join(values(map(copy(s:mayset_checks), { k -> k . '?' })), ' ')
+let s:global_settings = s:Execute('verbose setglobal all lines? ' . s:mayset_check_str)
+" 'lines=' delimits the start of the answer
+let s:global_settings = substitute(s:global_settings, '.*lines=[^\n]*', '', '') . "\n"
+" ^ begins and ends in newline
+
 " Check if an option was set from a file in $HOME.  This lets us avoid
 " overriding options in the user's vimrc, but still override options in the
 " system vimrc.
 function! s:MaySet(option) abort
-  let out = s:Execute('verbose setglobal all ' . a:option . '?')
-  return out !~# " \\(\\~[\\/][^\n]*\\|Lua\\)$"
+  "let _ = ! has('&' . a:option) || s:mayset_checks[a:option]  " debug: make sure setting was queried
+  let homerx = " \\(\\~[\\/][^\n]*\\|Lua\\)\n"
+  "return s:Execute('verbose setglobal all ' . a:option . '?') . "\n" !~# homerx  " previous version
+  return s:global_settings !~# ('\n\(\s\+\|no\)\?' . a:option . '\(=[^\n]*\n\|\n\)' . '[^\n]*' . homerx)
 endfunction
 
 if s:MaySet('backspace')