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gistfile1.vim

function! Memo() range
  let tmp = @@
  silent normal gvy
  let selected = @@
  let @@ = tmp

  let line = line('.')
  let memo = input('memo: ')
  let fpath = expand('%:p')
  let buf  = ''
  let buf  = buf . "\n"
  let buf  = buf . memo . "\n"
  let buf  = buf . "```" . fpath . ":" . line . "\n"
  let buf  = buf .  selected . "\n"
  let buf  = buf . "```\n"

  let @0   = buf
  let @+   = buf
endfunction
vnoremap <leader>m :call Memo()<Return>