System.AsyncProcess: Added stop interface in System.AsyncProcess.

Author: mikoto2000

autoload/vital/__vital__/System/AsyncProcess.vim

@@ -103,20 +103,31 @@ function! s:execute(command, options) abort
   endif
   let args = args + [command]
 
+  let job_id = -1
   if s:is_nvim
     let options = {}
     let options['on_stdout'] = function('s:inner_out_cb', [a:options.out_cb])
     let options['on_stderr'] = function('s:inner_err_cb', [a:options.err_cb])
     let options['on_exit'] = function('s:inner_exit_cb', [a:options.exit_cb])
 
-    call jobstart([&shell] + args, options)
+    let job_id = jobstart([&shell] + args, options)
+
+    return {
+          \ 'stop': function('jobstop', [job_id]),
+          \  }
   else
     let options = {}
     let options['out_cb'] = function('s:inner_out_cb', [a:options.out_cb])
     let options['err_cb'] = function('s:inner_err_cb', [a:options.err_cb])
     let options['exit_cb'] = function('s:inner_exit_cb', [a:options.exit_cb])
 
-    call job_start([&shell] + args, options)
+    let job = job_start([&shell] + args, options)
+
+    return {
+          \ 'stop': function('job_stop', [job]),
+          \  }
+    }
+
   endif
 endfunction