让Vim自动编译lessc > css

" Less compile
autocmd FileWritePost,BufWritePost *.less :call LessCSSCompress()
function! LessCSSCompress()
  let cwd = expand('<afile>:p:h')
  let name = expand('<afile>:t:r')
  if (executable('lessc'))
    cal system('lessc '.cwd.'/'.name.'.less > '.cwd.'/'.name.'.css &')
  endif
endfunction