job_start()の動作確認

jobtest.vim

function! s:get_sid_prefix() abort
  return matchstr(expand('<sfile>'), '^function \zs<SNR>\d\+_\zeget_sid_prefix$')
endfunction
let s:sid_prefix = s:get_sid_prefix()
delfunction s:get_sid_prefix

function! s:callback(channel, msg) abort
  echo "from the handler: " a:channel . ' : ' . a:msg
endfunction

let s:jobopt = {
      \ 'callback': s:sid_prefix . 'callback'
      \}
call job_start('bash -c "for i in {1..10}; do echo hello $i!; sleep 1; done"', s:jobopt)