• Fix slow write commands in vim

I figured out it is because the undofile can get obese over time.

Here is a snippet I use in my .

function! AskClearUndoHistory()
 if &undofile
 let undofile = undofile(expand('%'))
 if filereadable(undofile)
 let size = getfsize(undofile)
 let size_mb = size / (1024 * 1024)
 echo printf("Undo file: %.1f MB", size_mb)
 if size > 0
 let choice = confirm("Undo file is " . printf("%.1f", size_mb) . " MB. Clear it?", 
 \ "&Yes\n&No", 2)
 if choice == 1
 call ClearUndoHistory()
 endif
 endif
 endif
 endif
endfunction
function! CheckUndoFileSizeMinimal()
 if &undofile
 try
 let size = getfsize(undofile(expand('%')))
 if size > 52428800 " 50MB in bytes, avoid float math
        echohl WarningMsg | echo "Large undo file! Call ClearUndo to clear it." | echohl None
      endif
    catch | endtry
  endif
endfunction
function! ClearUndoHistory()
  let old_undolevels = &undolevels
  set undolevels=-1
  exe "normal a \<BS>\<Esc>"
  let &undolevels = old_undolevels
  echo "Undo history cleared"
endfunction
autocmd InsertLeave,BufLeave,FocusLost * silent! update | call CheckUndoFileSizeMinimal()
autocmd BufWritePost * call CheckUndoFileSizeMinimal()
command! CheckUndoSize call AskClearUndoHistory()
command! ClearUndo call ClearUndoHistory()