An alternative vimgrep

vg.vim

function! VG(pattern)
  silent exe "vimgrep /" . a:pattern . "/ %"
  silent exe "copen"
  silent exe "setlocal cul"
endfunction

function! VGAdd(pattern)
  silent exe "vimgrepadd /" . a:pattern . "/ %"
  silent exe "copen"
  silent exe "setlocal cul"
endfunction

command! -nargs=+ VG :call VG(<q-args>)
map <leader>g :VG 

command! -nargs=+ VGAdd :call VGAdd(<q-args>)
map <leader>a :VGAdd