support async viml calls

Author: bfredl

neovim/api/nvim.py

@@ -126,9 +126,13 @@ def eval(self, string, async=False):
         """Evaluate a vimscript expression."""
         return self._session.request('vim_eval', string, async=async)
 
-    def call(self, name, *args):
+    def call(self, name, *args, **kwargs):
         """Call a vimscript function."""
-        return self._session.request('vim_call_function', name, args)
+        for k in kwargs:
+            if k != "async":
+                raise TypeError(
+                    "call() got an unexpected keyword argument '{}'".format(k))
+        return self._session.request('vim_call_function', name, args, **kwargs)
 
     def strwidth(self, string):
         """Return the number of display cells `string` occupies.

test/test_client_rpc.py

@@ -39,11 +39,12 @@ def request_cb(name, args):
 def test_async_call():
 
     def request_cb(name, args):
-        vim.vars['result'] = 17
+        if name == "test-event":
+            vim.vars['result'] = 17
         vim.session.stop()
 
     # this would have dead-locked if not async
-    vim.eval('rpcrequest(%d, "test-event")' % vim.channel_id, async=True)
+    vim.funcs.rpcrequest(vim.channel_id, "test-event", async=True)
     vim.session.run(request_cb, None, None)
     eq(vim.vars['result'], 17)