* Refactored ConsoleWidget execution API for greater flexibility and clarity.

* Fixed bug where multi-line input was broken when the buffer size was exceeded
* Properly implemented execute_file

IPython/frontend/qt/console/console_widget.py

@@ -382,15 +382,58 b' class ConsoleWidget(QtGui.QPlainTextEdit):'
     # 'ConsoleWidget' public interface
     #---------------------------------------------------------------------------
 
-    def execute(self, interactive=False):
-        """ Execute the text in the input buffer. Returns whether the input
-            buffer was completely processed and a new prompt created.
+    def execute(self, source=None, hidden=False, interactive=False):
+        """ Executes source or the input buffer, possibly prompting for more
+        input.
+
+        Parameters:
+        -----------     
+        source : str, optional
+
+            The source to execute. If not specified, the input buffer will be
+            used. If specified and 'hidden' is False, the input buffer will be
+            replaced with the source before execution.
+
+        hidden : bool, optional (default False)
+
+            If set, no output will be shown and the prompt will not be modified.
+            In other words, it will be completely invisible to the user that
+            an execution has occurred.
+
+        interactive : bool, optional (default False)
+
+            Whether the console is to treat the source as having been manually
+            entered by the user. The effect of this parameter depends on the
+            subclass implementation.
+
+        Returns:
+        --------
+        A boolean indicating whether the source was executed.
         """
+        if not hidden:
+            if source is not None:
+                self.input_buffer = source
+
         self.appendPlainText('\n')
         self._executing_input_buffer = self.input_buffer
         self._executing = True
         self._prompt_finished()
-        return self._execute(interactive=interactive)
+
+        real_source = self.input_buffer if source is None else source
+        complete = self._is_complete(real_source, interactive)
+        if complete:
+            if not hidden:
+                # The maximum block count is only in effect during execution.
+                # This ensures that _prompt_pos does not become invalid due to
+                # text truncation.
+                self.setMaximumBlockCount(self.buffer_size)
+            self._execute(real_source, hidden)
+        elif hidden:
+            raise RuntimeError('Incomplete noninteractive input: "%s"' % source)
+        else:
+            self._show_continuation_prompt()
+
+        return complete
 
     def _get_input_buffer(self):
         """ The text that the user has entered entered at the current prompt.
@@ -475,11 +518,15 b' class ConsoleWidget(QtGui.QPlainTextEdit):'
     # 'ConsoleWidget' abstract interface
     #---------------------------------------------------------------------------
 
-    def _execute(self, interactive):
-        """ Called to execute the input buffer. When triggered by an the enter
-            key press, 'interactive' is True; otherwise, it is False. Returns
-            whether the input buffer was completely processed and a new prompt
-            created.
+    def _is_complete(self, source, interactive):
+        """ Returns whether 'source' can be executed. When triggered by an
+            Enter/Return key press, 'interactive' is True; otherwise, it is
+            False.
+        """
+        raise NotImplementedError
+
+    def _execute(self, source, hidden):
+        """ Execute 'source'. If 'hidden', do not show any output.
         """
         raise NotImplementedError
 
@@ -604,7 +651,8 b' class ConsoleWidget(QtGui.QPlainTextEdit):'
     def _prompt_started(self):
         """ Called immediately after a new prompt is displayed.
         """
-        # Temporarily disable the maximum block count to permit undo/redo.
+        # Temporarily disable the maximum block count to permit undo/redo and 
+        # to ensure that the prompt position does not change due to truncation.
         self.setMaximumBlockCount(0)
         self.setUndoRedoEnabled(True)
 
@@ -619,9 +667,7 b' class ConsoleWidget(QtGui.QPlainTextEdit):'
         """ Called immediately after a prompt is finished, i.e. when some input
             will be processed and a new prompt displayed.
         """
-        # This has the (desired) side effect of disabling the undo/redo history.
-        self.setMaximumBlockCount(self.buffer_size)
-
+        self.setUndoRedoEnabled(False)
         self.setReadOnly(True)
         self._prompt_finished_hook()
 
@@ -702,14 +748,19 b' class HistoryConsoleWidget(ConsoleWidget):'
     # 'ConsoleWidget' public interface
     #---------------------------------------------------------------------------
 
-    def execute(self, interactive=False):
+    def execute(self, source=None, hidden=False, interactive=False):
         """ Reimplemented to the store history.
         """
-        stripped = self.input_buffer.rstrip()
-        executed = super(HistoryConsoleWidget, self).execute(interactive)
-        if executed:
-            self._history.append(stripped)
+        if source is None and not hidden:
+            history = self.input_buffer.rstrip()
+
+        executed = super(HistoryConsoleWidget, self).execute(
+            source, hidden, interactive)
+
+        if executed and not hidden:
+            self._history.append(history)
             self._history_index = len(self._history)
+
         return executed
 
     #---------------------------------------------------------------------------

IPython/frontend/qt/console/frontend_widget.py

@@ -90,6 +90,7 b' class FrontendWidget(HistoryConsoleWidget):'
                 self._control_down(event.modifiers()):
             self._interrupt_kernel()
         else:
+            if self._call_tip_widget.isVisible():
             self._call_tip_widget.keyPressEvent(event)
             super(FrontendWidget, self).keyPressEvent(event)
 
@@ -97,19 +98,32 b' class FrontendWidget(HistoryConsoleWidget):'
     # 'ConsoleWidget' abstract interface
     #---------------------------------------------------------------------------
 
-    def _execute(self, interactive):
-        """ Called to execute the input buffer. When triggered by an the enter
-            key press, 'interactive' is True; otherwise, it is False. Returns
-            whether the input buffer was completely processed and a new prompt
-            created.
+    def _is_complete(self, source, interactive):
+        """ Returns whether 'source' can be completely processed and a new
+            prompt created. When triggered by an Enter/Return key press,
+            'interactive' is True; otherwise, it is False.
         """
-        return self.execute_source(self.input_buffer, interactive=interactive)
+        complete = self._input_splitter.push(source)
+        if interactive:
+            complete = not self._input_splitter.push_accepts_more()
+        return complete
+
+    def _execute(self, source, hidden):
+        """ Execute 'source'. If 'hidden', do not show any output.
+        """
+        self.kernel_manager.xreq_channel.execute(source)
+        self._hidden = hidden
         
     def _prompt_started_hook(self):
         """ Called immediately after a new prompt is displayed.
         """
         self._highlighter.highlighting_on = True
 
+        # Auto-indent if this is a continuation prompt.
+        if self._get_prompt_cursor().blockNumber() != \
+                self._get_end_cursor().blockNumber():
+            self.appendPlainText(' ' * self._input_splitter.indent_spaces)
+
     def _prompt_finished_hook(self):
         """ Called immediately after a prompt is finished, i.e. when some input
             will be processed and a new prompt displayed.
@@ -130,26 +144,11 b' class FrontendWidget(HistoryConsoleWidget):'
     # 'FrontendWidget' interface
     #---------------------------------------------------------------------------
 
-    def execute_source(self, source, hidden=False, interactive=False):
-        """ Execute a string containing Python code. If 'hidden', no output is
-            shown. Returns whether the source executed (i.e., returns True only
-            if no more input is necessary).
-        """
-        self._input_splitter.push(source)
-        executed = not self._input_splitter.push_accepts_more()
-        if executed:
-            self.kernel_manager.xreq_channel.execute(source)
-            self._hidden = hidden
-        else:
-            self._show_continuation_prompt()
-            self.appendPlainText(' ' * self._input_splitter.indent_spaces)
-        return executed
-
     def execute_file(self, path, hidden=False):
         """ Attempts to execute file with 'path'. If 'hidden', no output is
             shown.
         """
-        self.execute_source('run %s' % path, hidden=hidden)
+        self.execute('execfile("%s")' % path, hidden=hidden)
 
     def _get_kernel_manager(self):
         """ Returns the current kernel manager.
@@ -274,7 +273,8 b' class FrontendWidget(HistoryConsoleWidget):'
             self._call_tip()
 
     def _handle_sub(self, omsg):
-        if not self._hidden:
+        if self._hidden:
+            return
             handler = getattr(self, '_handle_%s' % omsg['msg_type'], None)
             if handler is not None:
                 handler(omsg)
@@ -286,8 +286,12 b' class FrontendWidget(HistoryConsoleWidget):'
 
     def _handle_stream(self, omsg):
         self.appendPlainText(omsg['content']['data'])
+        self.moveCursor(QtGui.QTextCursor.End)
         
     def _handle_execute_reply(self, rep):
+        if self._hidden:
+            return
+
         # Make sure that all output from the SUB channel has been processed
         # before writing a new prompt.
         self.kernel_manager.sub_channel.flush()

IPython/frontend/qt/console/ipython_widget.py

@@ -19,10 +19,10 b' class IPythonWidget(FrontendWidget):'
         self._magic_overrides = {}
 
     #---------------------------------------------------------------------------
-    # 'FrontendWidget' interface
+    # 'ConsoleWidget' abstract interface
     #---------------------------------------------------------------------------
 
-    def execute_source(self, source, hidden=False, interactive=False):
+    def _execute(self, source, hidden):
         """ Reimplemented to override magic commands.
         """
         magic_source = source.strip()
@@ -37,11 +37,18 b' class IPythonWidget(FrontendWidget):'
             output = callback(arguments)
             if output:
                 self.appendPlainText(output)
-            self._show_prompt('>>> ')
-            return True
+            self._show_prompt()
         else:
-            return super(IPythonWidget, self).execute_source(source, hidden,
-                                                             interactive)
+            super(IPythonWidget, self)._execute(source, hidden)
+
+    #---------------------------------------------------------------------------
+    # 'FrontendWidget' interface
+    #---------------------------------------------------------------------------
+
+    def execute_file(self, path, hidden=False):
+        """ Reimplemented to use the 'run' magic.
+        """
+        self.execute('run %s' % path, hidden=hidden)
 
     #---------------------------------------------------------------------------
     # 'IPythonWidget' interface