Make the wx frontend well-behaved under windows.

IPython/frontend/linefrontendbase.py

@@ -1,177 +1,176 b''
 """
 Base front end class for all line-oriented frontends.
 
 Currently this focuses on synchronous frontends.
 """
 __docformat__ = "restructuredtext en"
 
 #-------------------------------------------------------------------------------
 #  Copyright (C) 2008  The IPython Development Team
 #
 #  Distributed under the terms of the BSD License.  The full license is in
 #  the file COPYING, distributed as part of this software.
 #-------------------------------------------------------------------------------
 
 #-------------------------------------------------------------------------------
 # Imports
 #-------------------------------------------------------------------------------
 import re
 
 import IPython
 
-
 from frontendbase import FrontEndBase
 from IPython.kernel.core.interpreter import Interpreter
 
-
 def common_prefix(strings):
     ref = strings[0]
     prefix = ''
     for size in range(len(ref)):
         test_prefix = ref[:size+1]
         for string in strings[1:]:
             if not string.startswith(test_prefix):
                 return prefix
         prefix = test_prefix
 
     return prefix
 
 #-------------------------------------------------------------------------------
 # Base class for the line-oriented front ends
 #-------------------------------------------------------------------------------
 class LineFrontEndBase(FrontEndBase):
     
     # We need to keep the prompt number, to be able to increment
     # it when there is an exception.
     prompt_number = 1
 
     # To bootstrap
     last_result = dict(number=0)
 
     #--------------------------------------------------------------------------
     # Public API
     #--------------------------------------------------------------------------
 
     def __init__(self, shell=None, history=None):
         if shell is None:
             shell = Interpreter()
         FrontEndBase.__init__(self, shell=shell, history=history)
         
         #FIXME: print banner.
         banner = """IPython1 %s -- An enhanced Interactive Python.""" \
                             % IPython.__version__
 
 
     def complete(self, line):
         """Complete line in engine's user_ns
         
         Parameters
         ----------
         line : string
         
         Result
         ------
         The replacement for the line and the list of possible completions.
         """
         completions = self.shell.complete(line)
         complete_sep =  re.compile('[\s\{\}\[\]\(\)\=]')
         if completions:
             prefix = common_prefix(completions) 
             residual = complete_sep.split(line)[:-1]
             line = line[:-len(residual)] + prefix
         return line, completions 
  
 
     def render_result(self, result):
         if 'stdout' in result and result['stdout']:
             self.write('\n' + result['stdout'])
         if 'display' in result and result['display']:
             self.write("%s%s\n" % ( 
                             self.output_prompt % result['number'],
                             result['display']['pprint']
                             ) )
        
 
     def render_error(self, failure):
         self.insert_text('\n\n'+str(failure)+'\n\n')
         return failure
 
 
     def prefilter_input(self, string):
         string = string.replace('\r\n', '\n')
         string = string.replace('\t', 4*' ')
         # Clean the trailing whitespace
         string = '\n'.join(l.rstrip()  for l in string.split('\n'))
         return string
 
 
     def is_complete(self, string):
         if string in ('', '\n'):
             return True
         elif ( len(self.get_current_edit_buffer().split('\n'))>2 
                         and not re.findall(r"\n[\t ]*\n[\t ]*$", string)):
             return False
         else:
             # Add line returns here, to make sure that the statement is
             # complete.
             return FrontEndBase.is_complete(self, string.rstrip() + '\n\n')
     
 
     def execute(self, python_string, raw_string=None):
         """ Send the python_string to the interpreter, stores the
             raw_string in the history and starts a new prompt.
         """
         if raw_string is None:
             raw_string = python_string
         # Create a false result, in case there is an exception
         self.last_result = dict(number=self.prompt_number)
         try:
             self.history.input_cache[-1] = raw_string.rstrip()
             result = self.shell.execute(python_string)
             self.last_result = result
             self.render_result(result)
         except:
             self.show_traceback()
         finally:
             self.after_execute()
 
 
     def after_execute(self):
         """ All the operations required after an execution to put the
             terminal back in a shape where it is usable.
         """
         self.prompt_number += 1
         self.new_prompt(self.prompt % (self.last_result['number'] + 1))
         # Start a new empty history entry
         self._add_history(None, '')
         self.history_cursor = len(self.history.input_cache) - 1
 
 
     def _on_enter(self):
         """ Called when the return key is pressed in a line editing
             buffer.
         """
         current_buffer = self.get_current_edit_buffer()
         cleaned_buffer = self.prefilter_input(current_buffer)
         if self.is_complete(cleaned_buffer):
             self.execute(cleaned_buffer, raw_string=current_buffer)
         else:
-            self.write(self._get_indent_string(current_buffer[:-1]))
-            if current_buffer.rstrip().endswith(':'):
+            self.write(self._get_indent_string(
+                            current_buffer[:-1]))
+            if current_buffer[:-1].split('\n')[-1].rstrip().endswith(':'):
                 self.write('\t')
 
 
     #--------------------------------------------------------------------------
     # Private API
     #--------------------------------------------------------------------------
  
     def _get_indent_string(self, string):
         string = string.replace('\t', ' '*4)
         string = string.split('\n')[-1]
         indent_chars = len(string) - len(string.lstrip())
         indent_string = '\t'*(indent_chars // 4) + \
                             ' '*(indent_chars % 4)
 
         return indent_string
  
     

IPython/frontend/wx/console_widget.py

@@ -1,421 +1,430 b''
 # encoding: utf-8
 """
 A Wx widget to act as a console and input commands.
 
 This widget deals with prompts and provides an edit buffer
 restricted to after the last prompt.
 """
 
 __docformat__ = "restructuredtext en"
 
 #-------------------------------------------------------------------------------
 #  Copyright (C) 2008  The IPython Development Team
 #
 #  Distributed under the terms of the BSD License.  The full license is
 #  in the file COPYING, distributed as part of this software.
 #-------------------------------------------------------------------------------
 
 #-------------------------------------------------------------------------------
 # Imports
 #-------------------------------------------------------------------------------
 
 import wx
 import wx.stc  as  stc
 
 from wx.py import editwindow
+import sys
+LINESEP = '\n'
+if sys.platform == 'win32':
+    LINESEP = '\n\r'
 
 import re
 
 # FIXME: Need to provide an API for non user-generated display on the
 # screen: this should not be editable by the user.
 
-if wx.Platform == '__WXMSW__':
-    _DEFAULT_SIZE = 80
-else:
     _DEFAULT_SIZE = 10
 
 _DEFAULT_STYLE = {
     'stdout'      : 'fore:#0000FF',
     'stderr'      : 'fore:#007f00',
     'trace'       : 'fore:#FF0000',
 
     'default'     : 'size:%d' % _DEFAULT_SIZE,
     'bracegood'   : 'fore:#FFFFFF,back:#0000FF,bold',
     'bracebad'    : 'fore:#000000,back:#FF0000,bold',
 
     # properties for the various Python lexer styles
     'comment'       : 'fore:#007F00',
     'number'        : 'fore:#007F7F',
     'string'        : 'fore:#7F007F,italic',
     'char'          : 'fore:#7F007F,italic',
     'keyword'       : 'fore:#00007F,bold',
     'triple'        : 'fore:#7F0000',
     'tripledouble'  : 'fore:#7F0000',
     'class'         : 'fore:#0000FF,bold,underline',
     'def'           : 'fore:#007F7F,bold',
     'operator'      : 'bold'
     }
 
 # new style numbers
 _STDOUT_STYLE = 15
 _STDERR_STYLE = 16
 _TRACE_STYLE  = 17
 
 
 # system colors
 #SYS_COLOUR_BACKGROUND = wx.SystemSettings.GetColour(wx.SYS_COLOUR_BACKGROUND)
 
 #-------------------------------------------------------------------------------
 # The console widget class
 #-------------------------------------------------------------------------------
 class ConsoleWidget(editwindow.EditWindow):
     """ Specialized styled text control view for console-like workflow.
 
         This widget is mainly interested in dealing with the prompt and
         keeping the cursor inside the editing line.
     """
 
     title = 'Console'
 
     style = _DEFAULT_STYLE.copy()
 
     # Translation table from ANSI escape sequences to color. Override
     # this to specify your colors.
     ANSI_STYLES = {'0;30': [0, 'BLACK'],            '0;31': [1, 'RED'],
                    '0;32': [2, 'GREEN'],            '0;33': [3, 'BROWN'],
                    '0;34': [4, 'BLUE'],             '0;35': [5, 'PURPLE'],
                    '0;36': [6, 'CYAN'],             '0;37': [7, 'LIGHT GREY'],
                    '1;30': [8, 'DARK GREY'],        '1;31': [9, 'RED'],
                    '1;32': [10, 'SEA GREEN'],       '1;33': [11, 'YELLOW'],
                    '1;34': [12, 'LIGHT BLUE'],      '1;35':
                                                      [13, 'MEDIUM VIOLET RED'],
                    '1;36': [14, 'LIGHT STEEL BLUE'], '1;37': [15, 'YELLOW']}
 
     # The color of the carret (call _apply_style() after setting)
     carret_color = 'BLACK'
     
-    
     #--------------------------------------------------------------------------
     # Public API
     #--------------------------------------------------------------------------
     
     def __init__(self, parent, id=wx.ID_ANY, pos=wx.DefaultPosition, 
                         size=wx.DefaultSize, style=0, ):
         editwindow.EditWindow.__init__(self, parent, id, pos, size, style)
         self.configure_scintilla()
 
         # FIXME: we need to retrieve this from the interpreter.
         self.prompt = \
             '\n\x01\x1b[0;34m\x02In [\x01\x1b[1;34m\x02%i\x01\x1b[0;34m\x02]: \x01\x1b[0m\x02'
         self.new_prompt(self.prompt % 1)
 
         self.Bind(wx.EVT_KEY_DOWN, self._on_key_down)
         self.Bind(wx.EVT_KEY_UP, self._on_key_up)
     
 
     def configure_scintilla(self):
+        self.SetEOLMode(stc.STC_EOL_LF)
+
         # Ctrl"+" or Ctrl "-" can be used to zoomin/zoomout the text inside 
         # the widget
         self.CmdKeyAssign(ord('+'), stc.STC_SCMOD_CTRL, stc.STC_CMD_ZOOMIN)
         self.CmdKeyAssign(ord('-'), stc.STC_SCMOD_CTRL, stc.STC_CMD_ZOOMOUT)
         # Also allow Ctrl Shift "=" for poor non US keyboard users. 
         self.CmdKeyAssign(ord('='), stc.STC_SCMOD_CTRL|stc.STC_SCMOD_SHIFT, 
                                             stc.STC_CMD_ZOOMIN)
         
         #self.CmdKeyAssign(stc.STC_KEY_PRIOR, stc.STC_SCMOD_SHIFT,
         #                                    stc.STC_CMD_PAGEUP)
 
         #self.CmdKeyAssign(stc.STC_KEY_NEXT, stc.STC_SCMOD_SHIFT,
         #                                    stc.STC_CMD_PAGEDOWN)
 
         # Keys: we need to clear some of the keys the that don't play
         # well with a console.
         self.CmdKeyClear(ord('D'), stc.STC_SCMOD_CTRL)
         self.CmdKeyClear(ord('L'), stc.STC_SCMOD_CTRL)
         self.CmdKeyClear(ord('T'), stc.STC_SCMOD_CTRL)
 
 
         self.SetEOLMode(stc.STC_EOL_CRLF)
         self.SetWrapMode(stc.STC_WRAP_CHAR)
         self.SetWrapMode(stc.STC_WRAP_WORD)
         self.SetBufferedDraw(True)
         self.SetUseAntiAliasing(True)
         self.SetLayoutCache(stc.STC_CACHE_PAGE)
         self.SetUndoCollection(False)
         self.SetUseTabs(True)
         self.SetIndent(4)
         self.SetTabWidth(4)
 
         self.EnsureCaretVisible()
         # we don't want scintilla's autocompletion to choose 
         # automaticaly out of a single choice list, as we pop it up
         # automaticaly
         self.AutoCompSetChooseSingle(False)
         self.AutoCompSetMaxHeight(10)
 
         self.SetMargins(3, 3) #text is moved away from border with 3px
         # Suppressing Scintilla margins
         self.SetMarginWidth(0, 0)
         self.SetMarginWidth(1, 0)
         self.SetMarginWidth(2, 0)
 
         self._apply_style()
 
         # Xterm escape sequences
         self.color_pat = re.compile('\x01?\x1b\[(.*?)m\x02?')
         self.title_pat = re.compile('\x1b]0;(.*?)\x07')
 
         #self.SetEdgeMode(stc.STC_EDGE_LINE)
         #self.SetEdgeColumn(80)
 
         # styles
         p = self.style
         self.StyleSetSpec(stc.STC_STYLE_DEFAULT, p['default'])
         self.StyleClearAll()
         self.StyleSetSpec(_STDOUT_STYLE, p['stdout'])
         self.StyleSetSpec(_STDERR_STYLE, p['stderr'])
         self.StyleSetSpec(_TRACE_STYLE, p['trace'])
 
         self.StyleSetSpec(stc.STC_STYLE_BRACELIGHT, p['bracegood'])
         self.StyleSetSpec(stc.STC_STYLE_BRACEBAD, p['bracebad'])
         self.StyleSetSpec(stc.STC_P_COMMENTLINE, p['comment'])
         self.StyleSetSpec(stc.STC_P_NUMBER, p['number'])
         self.StyleSetSpec(stc.STC_P_STRING, p['string'])
         self.StyleSetSpec(stc.STC_P_CHARACTER, p['char'])
         self.StyleSetSpec(stc.STC_P_WORD, p['keyword'])
         self.StyleSetSpec(stc.STC_P_WORD2, p['keyword'])
         self.StyleSetSpec(stc.STC_P_TRIPLE, p['triple'])
         self.StyleSetSpec(stc.STC_P_TRIPLEDOUBLE, p['tripledouble'])
         self.StyleSetSpec(stc.STC_P_CLASSNAME, p['class'])
         self.StyleSetSpec(stc.STC_P_DEFNAME, p['def'])
         self.StyleSetSpec(stc.STC_P_OPERATOR, p['operator'])
         self.StyleSetSpec(stc.STC_P_COMMENTBLOCK, p['comment'])
 
 
     def write(self, text):
         """ Write given text to buffer, while translating the ansi escape
             sequences.
         """
         # XXX: do not put print statements in this method, the print
         # statements will call this method, and you will end up with
         # an infinit loop
         title = self.title_pat.split(text)
         if len(title)>1:
             self.title = title[-2]
 
         text = self.title_pat.sub('', text)
         segments = self.color_pat.split(text)
         segment = segments.pop(0)
+        self.GotoPos(self.GetLength())
         self.StartStyling(self.GetLength(), 0xFF)
         self.AppendText(segment)
         
         if segments:
             for ansi_tag, text in zip(segments[::2], segments[1::2]):
                 self.StartStyling(self.GetLength(), 0xFF)
                 self.AppendText(text)
 
                 if ansi_tag not in self.ANSI_STYLES:
                     style = 0
                 else:
                     style = self.ANSI_STYLES[ansi_tag][0]
 
                 self.SetStyling(len(text), style) 
                 
         self.GotoPos(self.GetLength())
         wx.Yield()
     
    
     def new_prompt(self, prompt):
         """ Prints a prompt at start of line, and move the start of the
             current block there.
 
             The prompt can be give with ascii escape sequences.
         """
         self.write(prompt)
         # now we update our cursor giving end of prompt
         self.current_prompt_pos = self.GetLength()
         self.current_prompt_line = self.GetCurrentLine()
         wx.Yield()
         self.EnsureCaretVisible()
 
         
     def replace_current_edit_buffer(self, text):
         """ Replace currently entered command line with given text.
         """
         self.SetSelection(self.current_prompt_pos, self.GetLength())
         self.ReplaceSelection(text)
         self.GotoPos(self.GetLength())
     
     
     def get_current_edit_buffer(self):
         """ Returns the text in current edit buffer.
         """
-        return self.GetTextRange(self.current_prompt_pos,
+        current_edit_buffer = self.GetTextRange(self.current_prompt_pos,
                                  self.GetLength())
+        current_edit_buffer = current_edit_buffer.replace(LINESEP, '\n')
+        return current_edit_buffer
 
 
     #--------------------------------------------------------------------------
     # Private API
     #--------------------------------------------------------------------------
     
     def _apply_style(self):
         """ Applies the colors for the different text elements and the
             carret.
         """
         self.SetCaretForeground(self.carret_color)
 
         #self.StyleClearAll()
         self.StyleSetSpec(stc.STC_STYLE_BRACELIGHT,  
                           "fore:#FF0000,back:#0000FF,bold")
         self.StyleSetSpec(stc.STC_STYLE_BRACEBAD,
                           "fore:#000000,back:#FF0000,bold")
 
         for style in self.ANSI_STYLES.values():
             self.StyleSetSpec(style[0], "bold,fore:%s" % style[1])
 
 
     def write_completion(self, possibilities):
         # FIXME: This is non Wx specific and needs to be moved into
         # the base class.
         current_buffer = self.get_current_edit_buffer()
         
         self.write('\n')
         max_len = len(max(possibilities, key=len)) + 1
         
         #now we check how much symbol we can put on a line...
         chars_per_line = self.GetSize()[0]/self.GetCharWidth()
         symbols_per_line = max(1, chars_per_line/max_len)
 
         pos = 1
         buf = []
         for symbol in possibilities:
             if pos < symbols_per_line:
                 buf.append(symbol.ljust(max_len))
                 pos += 1
             else:
                 buf.append(symbol.rstrip() +'\n')
                 pos = 1
         self.write(''.join(buf))
         self.new_prompt(self.prompt % (self.last_result['number'] + 1))
         self.replace_current_edit_buffer(current_buffer)
 
 
     def pop_completion(self, possibilities, offset=0):
         """ Pops up an autocompletion menu. Offset is the offset
             in characters of the position at which the menu should
             appear, relativ to the cursor.
         """
         self.AutoCompSetIgnoreCase(False)
         self.AutoCompSetAutoHide(False)
         self.AutoCompSetMaxHeight(len(possibilities))
         self.AutoCompShow(offset, " ".join(possibilities))
 
     
     def scroll_to_bottom(self):
         maxrange = self.GetScrollRange(wx.VERTICAL)
         self.ScrollLines(maxrange)
 
 
-    def _on_enter(self):
-        """ Called when the return key is hit.
-        """
-        pass
-
-
     def _on_key_down(self, event, skip=True):
         """ Key press callback used for correcting behavior for 
             console-like interfaces: the cursor is constraint to be after
             the last prompt.
 
             Return True if event as been catched.
         """
         catched = True
         # Intercept some specific keys.
         if event.KeyCode == ord('L') and event.ControlDown() :
             self.scroll_to_bottom()
         elif event.KeyCode == ord('K') and event.ControlDown() :
             self.replace_current_edit_buffer('')
         elif event.KeyCode == wx.WXK_PAGEUP and event.ShiftDown():
             self.ScrollPages(-1)
         elif event.KeyCode == wx.WXK_PAGEDOWN and event.ShiftDown():
             self.ScrollPages(1)
         elif event.KeyCode == wx.WXK_UP and event.ShiftDown():
             self.ScrollLines(-1)
         elif event.KeyCode == wx.WXK_DOWN and event.ShiftDown():
             self.ScrollLines(1)
         else:
             catched = False
 
         if self.AutoCompActive():
             event.Skip()
         else:
             if event.KeyCode in (13, wx.WXK_NUMPAD_ENTER) and \
                         event.Modifiers in (wx.MOD_NONE, wx.MOD_WIN):
                 catched = True
                 self.CallTipCancel()
                 self.write('\n')
+                # Under windows scintilla seems to be doing funny stuff to the 
+                # line returns here, but get_current_edit_buffer filters this 
+                # out.
+                if sys.platform == 'win32':
+                    self.replace_current_edit_buffer(
+                                self.get_current_edit_buffer())
                 self._on_enter()
 
             elif event.KeyCode == wx.WXK_HOME:
                 if event.Modifiers in (wx.MOD_NONE, wx.MOD_WIN):
                     self.GotoPos(self.current_prompt_pos)
                     catched = True
 
                 elif event.Modifiers in  (wx.MOD_SHIFT, wx.MOD_WIN) :
                     # FIXME: This behavior is not ideal: if the selection
                     # is already started, it will jump.
                     self.SetSelectionStart(self.current_prompt_pos) 
                     self.SetSelectionEnd(self.GetCurrentPos())
                     catched = True
 
             elif event.KeyCode == wx.WXK_UP:
                 if self.GetCurrentLine() > self.current_prompt_line:
                     if self.GetCurrentLine() == self.current_prompt_line + 1 \
                             and self.GetColumn(self.GetCurrentPos()) < \
                                 self.GetColumn(self.current_prompt_pos):
                         self.GotoPos(self.current_prompt_pos)
                     else:
                         event.Skip()
                 catched = True
 
             elif event.KeyCode in (wx.WXK_LEFT, wx.WXK_BACK):
                 if self.GetCurrentPos() > self.current_prompt_pos:
                     event.Skip()
                 catched = True
 
             if skip and not catched:
+                # Put the cursor back in the edit region
+                if self.GetCurrentPos() < self.current_prompt_pos:
+                    self.GotoPos(self.current_prompt_pos)
+                else:
                 event.Skip()
 
         return catched
 
 
     def _on_key_up(self, event, skip=True):
         """ If cursor is outside the editing region, put it back.
         """
         event.Skip()
         if self.GetCurrentPos() < self.current_prompt_pos:
             self.GotoPos(self.current_prompt_pos)
 
 
 
 
 if __name__ == '__main__':
     # Some simple code to test the console widget.
     class MainWindow(wx.Frame):
         def __init__(self, parent, id, title):
             wx.Frame.__init__(self, parent, id, title, size=(300,250))
             self._sizer = wx.BoxSizer(wx.VERTICAL)
             self.console_widget = ConsoleWidget(self)
             self._sizer.Add(self.console_widget, 1, wx.EXPAND)
             self.SetSizer(self._sizer)
             self.SetAutoLayout(1)
             self.Show(True)
 
     app = wx.PySimpleApp()
     w = MainWindow(None, wx.ID_ANY, 'ConsoleWidget')
     w.SetSize((780, 460))
     w.Show()
 
     app.MainLoop()
 
 

IPython/frontend/wx/wx_frontend.py

@@ -1,271 +1,277 b''
 # encoding: utf-8 -*- test-case-name:
 # FIXME: Need to add tests.
 # ipython1.frontend.cocoa.tests.test_cocoa_frontend -*-
 
 """Classes to provide a Wx frontend to the
 IPython.kernel.core.interpreter.
 
 """
 
 __docformat__ = "restructuredtext en"
 
 #-------------------------------------------------------------------------------
 #       Copyright (C) 2008  The IPython Development Team
 #
 #  Distributed under the terms of the BSD License.  The full license is in
 #  the file COPYING, distributed as part of this software.
 #-------------------------------------------------------------------------------
 
 #-------------------------------------------------------------------------------
 # Imports
 #-------------------------------------------------------------------------------
 
 
 import wx
 import re
 from wx import stc
 from console_widget import ConsoleWidget
 import __builtin__
 from time import sleep
 
 from IPython.frontend.prefilterfrontend import PrefilterFrontEnd
 
 #_COMMAND_BG = '#FAFAF1' # Nice green
 _RUNNING_BUFFER_BG = '#FDFFD3' # Nice yellow
 _ERROR_BG = '#FFF1F1' # Nice red
 
 _RUNNING_BUFFER_MARKER = 31
 _ERROR_MARKER = 30
 
 #-------------------------------------------------------------------------------
 # Classes to implement the Wx frontend
 #-------------------------------------------------------------------------------
 class WxController(PrefilterFrontEnd, ConsoleWidget):
 
     output_prompt = \
     '\x01\x1b[0;31m\x02Out[\x01\x1b[1;31m\x02%i\x01\x1b[0;31m\x02]: \x01\x1b[0m\x02'
   
+    debug = True
+  
     #--------------------------------------------------------------------------
     # Public API
     #--------------------------------------------------------------------------
  
     def __init__(self, parent, id=wx.ID_ANY, pos=wx.DefaultPosition,
                  size=wx.DefaultSize, style=wx.CLIP_CHILDREN,
                  *args, **kwds):
         """ Create Shell instance.
         """
         ConsoleWidget.__init__(self, parent, id, pos, size, style)
         PrefilterFrontEnd.__init__(self)
 
         # Capture Character keys
         self.Bind(wx.EVT_KEY_DOWN, self._on_key_down)
 
         # Marker for running buffer.
         self.MarkerDefine(_RUNNING_BUFFER_MARKER, stc.STC_MARK_BACKGROUND,
                                 background=_RUNNING_BUFFER_BG)
         # Marker for tracebacks.
         self.MarkerDefine(_ERROR_MARKER, stc.STC_MARK_BACKGROUND,
                                 background=_ERROR_BG)
 
 
-
     def do_completion(self):
         """ Do code completion. 
         """
         line = self.get_current_edit_buffer()
         new_line, completions = self.complete(line)
         if len(completions)>1:
             self.write_completion(completions)
         self.replace_current_edit_buffer(new_line)
 
 
     def do_calltip(self):
         separators =  re.compile('[\s\{\}\[\]\(\)\= ,:]')
         symbol = self.get_current_edit_buffer()
         symbol_string = separators.split(symbol)[-1]
         base_symbol_string = symbol_string.split('.')[0]
         if base_symbol_string in self.shell.user_ns:
             symbol = self.shell.user_ns[base_symbol_string]
         elif base_symbol_string in self.shell.user_global_ns:
             symbol = self.shell.user_global_ns[base_symbol_string]
         elif base_symbol_string in __builtin__.__dict__:
             symbol = __builtin__.__dict__[base_symbol_string]
         else:
             return False
         for name in symbol_string.split('.')[1:] + ['__doc__']:
             symbol = getattr(symbol, name)
         try:
             self.AutoCompCancel()
             wx.Yield()
             self.CallTipShow(self.GetCurrentPos(), symbol)
         except:
             # The retrieve symbol couldn't be converted to a string
             pass
 
 
     def popup_completion(self, create=False):
         """ Updates the popup completion menu if it exists. If create is 
             true, open the menu.
         """
         line = self.get_current_edit_buffer()
         if (self.AutoCompActive() and not line[-1] == '.') \
                     or create==True:
             suggestion, completions = self.complete(line)
             offset=0
             if completions:
                 complete_sep =  re.compile('[\s\{\}\[\]\(\)\= ,:]')
                 residual = complete_sep.split(line)[-1]
                 offset = len(residual)
                 self.pop_completion(completions, offset=offset)
 
 
     def raw_input(self, prompt):
         """ A replacement from python's raw_input.
         """
         self.new_prompt(prompt)
         self.waiting = True
         self.__old_on_enter = self._on_enter
         def my_on_enter():
             self.waiting = False
         self._on_enter = my_on_enter
         # XXX: Busy waiting, ugly.
         while self.waiting:
             wx.Yield()
             sleep(0.1)
         self._on_enter = self.__old_on_enter
         return self.get_current_edit_buffer().rstrip('\n')
         
  
     def execute(self, python_string, raw_string=None):
         self.CallTipCancel()
         self._cursor = wx.BusyCursor()
         if raw_string is None:
             raw_string = python_string
         end_line = self.current_prompt_line \
                         + max(1,  len(raw_string.split('\n'))-1)
         for i in range(self.current_prompt_line, end_line):
             self.MarkerAdd(i, _RUNNING_BUFFER_MARKER)
         # Update the display:
         wx.Yield()
         ## Remove the trailing "\n" for cleaner display
         #self.SetSelection(self.GetLength()-1, self.GetLength())
         #self.ReplaceSelection('')
         self.GotoPos(self.GetLength())
         PrefilterFrontEnd.execute(self, python_string, raw_string=raw_string)
 
 
     def capture_output(self):
         self.__old_raw_input = __builtin__.raw_input
         __builtin__.raw_input = self.raw_input
         PrefilterFrontEnd.capture_output(self)
         
     
     def release_output(self):
         __builtin__.raw_input = self.__old_raw_input
         PrefilterFrontEnd.capture_output(self)
 
 
     def after_execute(self):
         PrefilterFrontEnd.after_execute(self)
         if hasattr(self, '_cursor'):
             del self._cursor
 
 
     def show_traceback(self):
         start_line = self.GetCurrentLine()
         PrefilterFrontEnd.show_traceback(self)
         wx.Yield()
         for i in range(start_line, self.GetCurrentLine()):
             self.MarkerAdd(i, _ERROR_MARKER)
             
 
     #--------------------------------------------------------------------------
     # Private API
     #--------------------------------------------------------------------------
  
 
     def _on_key_down(self, event, skip=True):
         """ Capture the character events, let the parent
             widget handle them, and put our logic afterward.
         """
         current_line_number = self.GetCurrentLine()
         # Calltips
         if event.KeyCode == ord('('):
             event.Skip()
             self.do_calltip()
         elif self.AutoCompActive():
             event.Skip()
             if event.KeyCode in (wx.WXK_BACK, wx.WXK_DELETE): 
                 wx.CallAfter(self.popup_completion, create=True)
             elif not event.KeyCode in (wx.WXK_UP, wx.WXK_DOWN, wx.WXK_LEFT,
                             wx.WXK_RIGHT):
                 wx.CallAfter(self.popup_completion)
         else:
             # Up history
             if event.KeyCode == wx.WXK_UP and (
                     ( current_line_number == self.current_prompt_line and
                         event.Modifiers in (wx.MOD_NONE, wx.MOD_WIN) ) 
                     or event.ControlDown() ):
                 new_buffer = self.get_history_previous(
                                             self.get_current_edit_buffer())
                 if new_buffer is not None:
                     self.replace_current_edit_buffer(new_buffer)
                     if self.GetCurrentLine() > self.current_prompt_line:
                         # Go to first line, for seemless history up.
                         self.GotoPos(self.current_prompt_pos)
             # Down history
             elif event.KeyCode == wx.WXK_DOWN and (
                     ( current_line_number == self.LineCount -1 and
                         event.Modifiers in (wx.MOD_NONE, wx.MOD_WIN) ) 
                     or event.ControlDown() ):
                 new_buffer = self.get_history_next()
                 if new_buffer is not None:
                     self.replace_current_edit_buffer(new_buffer)
             # Tab-completion
             elif event.KeyCode == ord('\t'):
                 last_line = self.get_current_edit_buffer().split('\n')[-1]
                 if not re.match(r'^\s*$', last_line):
                     self.do_completion()
                 else:
                     event.Skip()
             else:
                 ConsoleWidget._on_key_down(self, event, skip=skip)
 
 
     def _on_key_up(self, event, skip=True):
         if event.KeyCode == 59:
             # Intercepting '.'
             event.Skip()
             self.popup_completion(create=True)
         else:
             ConsoleWidget._on_key_up(self, event, skip=skip)
 
+    def _on_enter(self):
+        if self.debug:
+            import sys
+            print >>sys.__stdout__, repr(self.get_current_edit_buffer())
+        PrefilterFrontEnd._on_enter(self)
 
     def _set_title(self, title):
             return self.Parent.SetTitle(title)
 
     def _get_title(self):
             return self.Parent.GetTitle()
 
     title = property(_get_title, _set_title)
 
 
 if __name__ == '__main__':
     class MainWindow(wx.Frame):
         def __init__(self, parent, id, title):
             wx.Frame.__init__(self, parent, id, title, size=(300,250))
             self._sizer = wx.BoxSizer(wx.VERTICAL)
             self.shell = WxController(self)
             self._sizer.Add(self.shell, 1, wx.EXPAND)
             self.SetSizer(self._sizer)
             self.SetAutoLayout(1)
             self.Show(True)
 
     app = wx.PySimpleApp()
     frame = MainWindow(None, wx.ID_ANY, 'Ipython')
     frame.shell.SetFocus()
     frame.SetSize((680, 460))
     self = frame.shell
 
     app.MainLoop()