Vim scripting: Preserve cursor position and screen view in function call

Question

I have some Vim functions that make changes to the document format. When I call this function, I currently use something like the following to save and restore my cursor positio

Answer 1

There is a plugin but I use a single function like this:

if !exists('*Preserve')
    function! Preserve(command)
        try
            " Preparation: save last search, and cursor position.
            let l:win_view = winsaveview()
            let l:old_query = getreg('/')
            silent! execute 'keepjumps ' . a:command
         finally
            " Clean up: restore previous search history, and cursor position
            call winrestview(l:win_view)
            call setreg('/', l:old_query)
         endtry
    endfunction
endif

then I call it to clean trailing spaces

fun! CleanExtraSpaces()
    call Preserve(':%s/\s\+$//ge')
endfun
com! Cls :call CleanExtraSpaces()
au! BufwritePre * :call CleanExtraSpaces()

del blank lines

fun! DelBlankLines()
    call Preserve(':%s/^\n\{2,}/\r/ge')
endfun
command! -nargs=0 DelBlank :call DelBlankLines()

and change Header (Last Modified) information

fun! ChangeHeader()
    call Preserve(':1,5s/Last Change: \zs.*/\=strftime("%c")/e')
endfun
command! -nargs=0 CH :call ChangeHeader()
au BufWritePost * :call ChangeHeader()