Support stdout

rplugin/python3/deoplete/child.py

@@ -84,8 +84,8 @@ def main(self):
                 self.debug('main_loop: end')
 
     def _write(self, expr):
-        sys.stdout.buffer.write(self._packer.pack(expr))
-        sys.stdout.flush()
+        sys.stderr.buffer.write(self._packer.pack(expr))
+        sys.stderr.flush()
 
     def _enable_logging(self):
         logging = self._vim.vars['deoplete#_logging']

rplugin/python3/deoplete/dp_main.py

@@ -5,6 +5,7 @@
 # ============================================================================
 
 import sys
+import io
 
 from neovim import attach
 
@@ -28,10 +29,22 @@ def attach_vim(serveraddr):
     return vim
 
 
+class RedirectStream(io.IOBase):
+    def __init__(self, handler):
+        self.handler = handler
+
+    def write(self, line):
+        self.handler(line)
+
+    def writelines(self, lines):
+        self.handler('\n'.join(lines))
+
+
 def main(serveraddr):
     vim = attach_vim(serveraddr)
     from deoplete.child import Child
     from deoplete.util import error_tb
+    sys.stdout = RedirectStream(lambda data: vim.out_write(data))
     try:
         child = Child(vim)
         child.main()

rplugin/python3/deoplete/process.py

@@ -48,7 +48,7 @@ def kill(self):
 
     def enqueue_output(self):
         while self._proc:
-            b = self._proc.stdout.raw.read(102400)
+            b = self._proc.stderr.raw.read(102400)
             if b == b'':
                 # EOF
                 break