add async#job#pid() (#28)

* add async#job#pid()

* fix type check

* added link to jobpid

.travis.yml

@@ -14,6 +14,5 @@ script:
     - pip install --user --upgrade vim-vint pathlib enum34 typing
     - python --version
     - vim --version
-    - vint --version
     - vint autoload
     - /tmp/vim-themis/bin/themis --reporter dot 

README.md

@@ -27,6 +27,9 @@ 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
 
@@ -43,6 +46,7 @@ APIs are based on neovim's job control APIs.
 * [jobstart()](https://neovim.io/doc/user/eval.html#jobstart%28%29)
 * [jobstop()](https://neovim.io/doc/user/eval.html#jobstop%28%29)
 * [jobwait()](https://neovim.io/doc/user/eval.html#jobwait%28%29)
+* [jobpid()](https://neovim.io/doc/user/eval.html#jobpid%28%29)
 
 ## Embedding
 

autoload/async/job.vim

@@ -246,6 +246,23 @@ function! s:job_wait(jobids, timeout) abort
     return l:ret
 endfunction
 
+function! s:job_pid(jobid) abort
+    if !has_key(s:jobs, a:jobid)
+        return 0
+    endif
+
+    let l:jobinfo = s:jobs[a:jobid]
+    if l:jobinfo.type == s:job_type_nvimjob
+        return jobpid(a:jobid)
+    elseif l:jobinfo.type == s:job_type_vimjob
+        let l:vimjobinfo = job_info(a:jobid)
+        if type(l:vimjobinfo) == type({}) && has_key(l:vimjobinfo, 'process')
+            return l:vimjobinfo['process']
+        endif
+    endif
+    return 0
+endfunction
+
 " public apis {{{
 function! async#job#start(cmd, opts) abort
     return s:job_start(a:cmd, a:opts)
@@ -263,4 +280,8 @@ function! async#job#wait(jobids, ...) abort
     let l:timeout = get(a:000, 0, -1)
     return s:job_wait(a:jobids, l:timeout)
 endfunction
+
+function! async#job#pid(jobid) abort
+    return s:job_pid(a:jobid)
+endfunction
 " }}}