Progress on raw_input.

IPython/frontend/qt/console/console_widget.py

@@ -256,11 +256,12 b' class ConsoleWidget(QtGui.QPlainTextEdit):'
         
         else:
             if key in (QtCore.Qt.Key_Return, QtCore.Qt.Key_Enter):
+                intercepted = True
                 if self._reading:
+                    intercepted = False
                     self._reading = False
                 elif not self._executing:
                     self.execute(interactive=True)
-                intercepted = True
 
             elif key == QtCore.Qt.Key_Up:
                 if self._reading or not self._up_pressed():
@@ -677,6 +678,19 b' class ConsoleWidget(QtGui.QPlainTextEdit):'
         self.setReadOnly(True)
         self._prompt_finished_hook()
 
+    def _readline(self, prompt=''):
+        """ Read and return one line of input from the user. The trailing 
+            newline is stripped.
+        """
+        if not self.isVisible():
+            raise RuntimeError('Cannot read a line if widget is not visible!')
+
+        self._reading = True
+        self._show_prompt(prompt)
+        while self._reading:
+            QtCore.QCoreApplication.processEvents()
+        return self.input_buffer.rstrip('\n\r')
+
     def _set_position(self, position):
         """ Convenience method to set the position of the cursor.
         """
@@ -691,11 +705,20 b' class ConsoleWidget(QtGui.QPlainTextEdit):'
 
     def _show_prompt(self, prompt=None):
         """ Writes a new prompt at the end of the buffer. If 'prompt' is not
-            specified, uses the previous prompt.
+            specified, the previous prompt is used.
         """
+        # Use QTextDocumentFragment intermediate object because it strips
+        # out the Unicode line break characters that Qt insists on inserting.
+        cursor = self._get_end_cursor()
+        cursor.movePosition(QtGui.QTextCursor.Left, 
+                            QtGui.QTextCursor.KeepAnchor)
+        if str(cursor.selection().toPlainText()) not in '\r\n':
+            self.appendPlainText('\n')
+
         if prompt is not None:
             self._prompt = prompt
-        self.appendPlainText('\n' + self._prompt)
+        self.appendPlainText(self._prompt)
+
         self._prompt_pos = self._get_end_cursor().position()
         self._prompt_started()
 

IPython/frontend/qt/console/frontend_widget.py

@@ -60,7 +60,6 b' class FrontendWidget(HistoryConsoleWidget):'
 
         # ConsoleWidget protected variables.
         self._continuation_prompt = '... '
-        self._prompt = '>>> '
 
         # FrontendWidget protected variables.
         self._call_tip_widget = CallTipWidget(self)
@@ -141,6 +140,17 b' class FrontendWidget(HistoryConsoleWidget):'
         return False
 
     #---------------------------------------------------------------------------
+    # 'ConsoleWidget' protected interface
+    #---------------------------------------------------------------------------
+
+    def _show_prompt(self, prompt=None):
+        """ Reimplemented to set a default prompt.
+        """
+        if prompt is None:
+            prompt = '>>> '
+        super(FrontendWidget, self)._show_prompt(prompt)
+
+    #---------------------------------------------------------------------------
     # 'FrontendWidget' interface
     #---------------------------------------------------------------------------
 
@@ -261,6 +271,16 b' class FrontendWidget(HistoryConsoleWidget):'
 
     #------ Signal handlers ----------------------------------------------------
 
+    def _started_channels(self):
+        """ Called when the kernel manager has started listening.
+        """
+        self.clear()
+
+    def _stopped_channels(self):
+        """ Called when the kernel manager has stopped listening.
+        """
+        pass
+
     def _document_contents_change(self, position, removed, added):
         """ Called whenever the document's content changes. Display a calltip
             if appropriate.
@@ -272,6 +292,9 b' class FrontendWidget(HistoryConsoleWidget):'
         if position == self.textCursor().position():
             self._call_tip()
 
+    def _handle_req(self):
+        print self._readline()
+
     def _handle_sub(self, omsg):
         if self._hidden:
             return
@@ -323,8 +346,4 b' class FrontendWidget(HistoryConsoleWidget):'
             if doc:
                 self._call_tip_widget.show_docstring(doc)
 
-    def _started_channels(self):
-        self.clear()
 
-    def _stopped_channels(self):
-        pass

IPython/zmq/kernel.py

@@ -28,6 +28,64 b' from session import Session, Message, extract_header'
 from completer import KernelCompleter
 
 
+class InStream(object):
+    """ A file like object that reads from a 0MQ XREQ socket."""
+
+    def __init__(self, session, socket):
+        self.session = session
+        self.socket = socket
+
+    def close(self):
+        self.socket = None
+
+    def flush(self):
+        if self.socket is None:
+            raise ValueError(u'I/O operation on closed file')
+        
+    def isatty(self):
+        return False
+
+    def next(self):
+        raise IOError('Seek not supported.')
+
+    def read(self, size=-1):
+        raise NotImplementedError
+
+    def readline(self, size=-1):
+        if self.socket is None:
+            raise ValueError(u'I/O operation on closed file')
+        else:
+            content = { u'size' : unicode(size) }
+            msg = self.session.msg(u'readline', content=content) 
+            return self._request(msg)
+
+    def readlines(self, size=-1):
+        raise NotImplementedError
+
+    def seek(self, offset, whence=None):
+        raise IOError('Seek not supported.')
+
+    def write(self, string):
+        raise IOError('Write not supported on a read only stream.')
+
+    def writelines(self, sequence):
+        raise IOError('Write not supported on a read only stream.')
+    
+    def _request(self, msg):
+        self.socket.send_json(msg)
+        while True:
+            try:
+                reply = self.socket.recv_json(zmq.NOBLOCK)
+            except zmq.ZMQError, e:
+                if e.errno == zmq.EAGAIN:
+                    pass
+                else:
+                    raise
+            else:
+                break
+        return reply[u'content'][u'data']
+
+
 class OutStream(object):
     """A file like object that publishes the stream to a 0MQ PUB socket."""
 
@@ -60,7 +118,7 b' class OutStream(object):'
                 self._buffer_len = 0
                 self._buffer = []
 
-    def isattr(self):
+    def isatty(self):
         return False
 
     def next(self):
@@ -113,28 +171,6 b' class DisplayHook(object):'
         self.parent_header = extract_header(parent)
 
 
-class RawInput(object):
-
-    def __init__(self, session, socket):
-        self.session = session
-        self.socket = socket
-
-    def __call__(self, prompt=None):
-        msg = self.session.msg(u'raw_input')
-        self.socket.send_json(msg)
-        while True:
-            try:
-                reply = self.socket.recv_json(zmq.NOBLOCK)
-            except zmq.ZMQError, e:
-                if e.errno == zmq.EAGAIN:
-                    pass
-                else:
-                    raise
-            else:
-                break
-        return reply[u'content'][u'data']
-
-
 class Kernel(object):
 
     def __init__(self, session, reply_socket, pub_socket):
@@ -319,7 +355,12 b' def main():'
     pub_port = bind_port(pub_socket, namespace.ip, namespace.pub)
     print >>sys.__stdout__, "PUB Channel on port", pub_port
 
+    req_socket = context.socket(zmq.XREQ)
+    req_port = bind_port(req_socket, namespace.ip, namespace.req)
+    print >>sys.__stdout__, "REQ Channel on port", req_port
+
     # Redirect input streams and set a display hook.
+    sys.stdin = InStream(session, req_socket)
     sys.stdout = OutStream(session, pub_socket, u'stdout')
     sys.stderr = OutStream(session, pub_socket, u'stderr')
     sys.displayhook = DisplayHook(session, pub_socket)

IPython/zmq/kernelmanager.py

@@ -218,7 +218,6 b' class XReqSocketChannel(ZmqSocketChannel):'
         -------
         The msg_id of the message sent.
         """
-        print oname
         content = dict(oname=oname)
         msg = self.session.msg('object_info_request', content)
         self._queue_request(msg)