normalize async job control api for vim and neovim

function! s:handler(job_id, data, event_type)
    echo a:job_id . ' ' . a:event_type
    echo join(a:data, "\n")
endfunction
if has('win32') || has('win64')
    let argv = ['cmd', '/c', 'dir c:\ /b']
else
    let argv = ['bash', '-c', 'ls']
endif
let jobid = async#job#start(argv, {
    \ 'on_stdout': function('s:handler'),
    \ 'on_stderr': function('s:handler'),
    \ 'on_exit': function('s:handler'),
    \ 'normalize': 'array'
\ })
if jobid > 0
    echom 'job started'
else
    echom 'job failed to start'
endif
" If you want to get the process id of the job
let pid = async#job#pid(jobid)
" If you want to wait the job:
call async#job#wait([jobid], 5000)  " timeout: 5 sec
" If you want to stop the job:
call async#job#stop(jobid)

APIs are based on neovim's job control APIs.

• job-control
• jobsend()
• jobstart()
• jobstop()
• jobwait()
• jobpid()

By default stdout and stderr data is an array. This is a noop for neovim but requiring using split in vim. This can tend to be costly if you are want a string since you are joining the splited string. To avoid this unncessary conversion you can normalize it to string so it is a noop in vim but a join for neovim. If you prefer to disable normalization pass normalization as raw.

normalize: 'array' " Valid values are 'array', 'string' or 'raw'

Async.vim can be either embedded with other plugins or be used as an external plugin. If you want to embed run the following vim command.

:AsyncEmbed path=./autoload/myplugin/job.vim namespace=myplugin#job

• Fallback to sync system() calls in vim that doesn't support job
• job_stop and job_send is treated as noop when using system()
• on_stderr doesn't work when using system()
• Fallback to python/ruby threads and vimproc instead of using system() for better compatibility (PRs welcome!!!)