Related neovim#907
Also junegunn/fzf#1750
function! RipgrepFzf(query, fullscreen)
  let command_fmt = 'rg --column --line-number --no-heading --color=always --smart-case %s || true'
  let initial_command = printf(command_fmt, shellescape(a:query))
  let reload_command = printf(command_fmt, '{q}')
  let options = {'options': ['--phony', '--query', a:query, '--bind', 'change:reload:'.reload_command]}
  call fzf#vim#grep(initial_command, 1, options, a:fullscreen)
endfunction
command! -nargs=* -bang RF call RipgrepFzf(<q-args>, <bang>0)