Using Uncrustify with VIM

Question

In my vimrc I call Uncrustify by this command:

%!uncrustify -l CPP -c D:\uncrustify\default.cfg

After that on some code I get a Windows Fatal error:

But when I call uncrustify on the same code in the console using the -f option, there is no error.

How can I change my vimrc to avoid such errors in the future? What can invoke this error?

Answer 1

In order to integrate Uncrustify with Vim properly, add the following to your .vimrc:

" Restore cursor position, window position, and last search after running a
" command.
function! Preserve(command)
  " Save the last search.
  let search = @/

  " Save the current cursor position.
  let cursor_position = getpos('.')

  " Save the current window position.
  normal! H
  let window_position = getpos('.')
  call setpos('.', cursor_position)

  " Execute the command.
  execute a:command

  " Restore the last search.
  let @/ = search

  " Restore the previous window position.
  call setpos('.', window_position)
  normal! zt

  " Restore the previous cursor position.
  call setpos('.', cursor_position)
endfunction

" Specify path to your Uncrustify configuration file.
let g:uncrustify_cfg_file_path =
    \ shellescape(fnamemodify('~/.uncrustify.cfg', ':p'))

" Don't forget to add Uncrustify executable to $PATH (on Unix) or 
" %PATH% (on Windows) for this command to work.
function! Uncrustify(language)
  call Preserve(':silent %!uncrustify'
      \ . ' -q '
      \ . ' -l ' . a:language
      \ . ' -c ' . g:uncrustify_cfg_file_path)
endfunction

Now you can either map this function (Uncrustify) to a combination of keys or you could do the convenient trick that I use. Create a file ~/.vim/after/ftplugin/cpp.vim where you can override any Vim settings particularly for C++ and add the following line there:

autocmd BufWritePre <buffer> :call Uncrustify('cpp')

This basically adds a pre-save hook. Now when you save the file with C++ code it will be automatically formatted by Uncrustify utilizing the configuration file you supplied earlier.

For example, the same could be done for Java: in ~/.vim/after/ftplugin/java.vim add:

autocmd BufWritePre <buffer> :call Uncrustify('java')

You got the point.

NOTE: Everything presented here is well-tested and used every day by me.