pathogen.vim

function! s:BundleUpdate()
  silent new __BUNDLE_UPDATE__
  setlocal buftype=nofile
  redraw
  for rtp in pathogen#split(&rtp)
    let path = expand(rtp, ':p')
    if isdirectory(printf("%s/.git", path))
      if &shellslash
        let command = printf('cd ''%s'' && git pull', path)
      else
        let command = printf('cmd /c "cd %s & git pull"', path)
      endif
      call setline(line('$'), [printf("updating %s", strpart(path, strridx(path, pathogen#separator())+1)), ""])
      redraw
      call setline(line('$'), map(split(system(command), "\n"), '"  ".v:val'))
      redraw
      normal! G
    endif
  endfor
endfunction

command! BundleUpdate :call <SID>BundleUpdate()