Add vim_input wrapper and use it to pass keys on tests

This is done to get out of any "press enter to continue" screens, because Nvim
no longer handles deferred events(such as calls to vim_command or vim_eval) when
in that state.

Author: tarruda

neovim/api/nvim.py

@@ -149,6 +149,16 @@ def feedkeys(self, keys, options=''):
         """
         return self._session.request('vim_feedkeys', keys, options)
 
+    def input(self, bytes):
+        """Push `bytes` to Nvim low level input buffer.
+
+        Unlike `feedkeys()`, this uses the lowest level input buffer and the
+        call is not deferred. It returns the number of bytes actually
+        written(which can be less than what was requested if the buffer is
+        full).
+        """
+        return self._session.request('vim_input', bytes)
+
     def replace_termcodes(self, string, from_part=False, do_lt=True,
                           special=True):
         r"""Replace any terminal code strings by byte sequences.

test/common.py

@@ -61,7 +61,7 @@
 endfunction
 '''
 
-vim.feedkeys(cleanup_func)
+vim.input(cleanup_func)
 
 def cleanup():
     # cleanup nvim

test/test_vim.py

@@ -9,6 +9,8 @@ def test_command():
     fname = tempfile.mkstemp()[1]
     vim.command('new')
     vim.command('edit %s' % fname)
+    # skip the "press return" state, which does not handle deferred calls
+    vim.input('\r')
     vim.command('normal itesting\npython\napi')
     vim.command('w')
     ok(os.path.isfile(fname))