vim build project async

function! DoRebuildBatchFile(...)

    echo "build " g:projectName

    "save the current working directory so we can come back

    let l:starting_directory = getcwd()

    execute("cd " . g:pr3)

    set makeprg=build.bat

    cclose

    " set build parameter    

    if a:1 >= 1

        if("debug" == a:1)

            set makeprg+=\ debug

        endif

    endif

    "" Make sure the output doesnt interfere with anything

    "'!' verhindert das automatische oeffnen der Datei mit der ersten Compilerwarnung

    "silent make! 

    make!

    "" Open the output buffer

    copen

    echo 'Build Complete'

    "reset directory

    execute "cd " . l:starting_directory

endfunction

function! s:onEvent(id, data, event) dict

    "if((event == "stdout") || (event == "stderr"))

  "endif

  "

    "if (event == "exit")

  "endif

  echo "callback onEvent"

  "echo id

  "echo data

  "echo event

endfunction

function! Test2(...)

    "save the current working directory so we can come back

    let l:starting_directory = getcwd()

    execute("cd " . g:pr3)

    let l:winnr = win_getid()

    let l:bufnr = nvim_win_get_buf(winnr)

  echo getcwd()

  set makeprg=rebuild.bat

  if a:0 >= 1

        if("debug" == a:1)

            set makeprg+=\ debugg

        endif

    endif

  let l:makeprg = nvim_buf_get_option(bufnr, "makeprg")

    "let l:cmd = expandcmd(makeprg)

  let l:cmd = "build.bat"

  let s:opts = {

    \ 'on_stderr':function('s:onEvent'),

    \ 'on_stdout':function('s:onEvent'),

    \ 'on_exit':function('s:onEvent'),

    \ 'stdout_buffered':v:true,

    \ 'stderr_buffered':v:true,

    \ }

    let l:job_id = jobstart(cmd, s:opts)

    "reset directory

    execute "cd " . l:starting_directory

endfunction