vim background job demo

demo.vim

" http://andrewvos.com/writing-async-jobs-in-vim-8

function! BackgroundCommandClose(channel)
  execute "cfile! " . g:backgroundCommandOutput
  copen
  unlet g:backgroundCommandOutput
endfunction

function! RunBackgroundCommand(command)
  if !exists('g:backgroundCommandOutput')
    let g:backgroundCommandOutput = tempname()
    call job_start(a:command, {'close_cb': 'BackgroundCommandClose', 'out_io': 'file', 'out_name': g:backgroundCommandOutput})
  endif
endfunction

command! -nargs=+ -complete=shellcmd RunBackgroundCommand call RunBackgroundCommand(<q-args>)