ruby.vim

" Use |:RubocopAutocorrect[!]| to autocorrect the current file using Rubocop.
" Note that this will save the file before running the autocorrects. If ! is 
" given, it will use unsafe autocorrects.
augroup ruby
  autocmd!
  autocmd FileType ruby command! -bang RubocopAutocorrect silent! call RubyRubocopAutocorrect(expand('<bang>') == '!')<CR>
augroup END

function! RubyRubocopAutocorrect(unsafe) abort
  let flag = a:unsafe ? '-A' : '-a'
  write | call system('rubocop ' . flag . ' ' . expand('%:p')) | edit
endfunction