'magic' command handling

IPython/gui/wx/ipython_view.py

@@ -1,1057 +1,1058 b''
 #!/usr/bin/python
 # -*- coding: iso-8859-15 -*-
 '''
 Provides IPython WX console widget.
 
 @author: Laurent Dufrechou
 laurent.dufrechou _at_ gmail.com
 This WX widget is based on the original work of Eitan Isaacson
 that provided the console for the GTK toolkit.
 
 Original work from:
 @author: Eitan Isaacson
 @organization: IBM Corporation
 @copyright: Copyright (c) 2007 IBM Corporation
 @license: BSD
 
 All rights reserved. This program and the accompanying materials are made
 available under the terms of the BSD which accompanies this distribution, and
 is available at U{http://www.opensource.org/licenses/bsd-license.php}
 '''
 
 __version__ = 0.8
 __author__  = "Laurent Dufrechou"
 __email__   = "laurent.dufrechou _at_ gmail.com"
 __license__ = "BSD"
 
 import wx
 import wx.stc  as  stc
 import wx.lib.newevent
 
 import re
 import sys
 import os
 import locale
 import time
 from ThreadEx import Thread
 from StringIO import StringIO
 
 try:
         import IPython
 except Exception,e:
         raise "Error importing IPython (%s)" % str(e)
 
 class IterableIPShell(Thread):
     '''
     Create an IPython instance inside a dedicated thread.
     Does not start a blocking event loop, instead allow single iterations.
     This allows embedding in any GUI without blockage.
     The thread is a slave one, in that it doesn't interact directly with the GUI.
     Note Thread class comes from ThreadEx that supports asynchroneous function call
     via raise_exc()
     '''
 
     def __init__(self,argv=[],user_ns=None,user_global_ns=None,
                  cin=None, cout=None, cerr=None,
                  exit_handler=None,time_loop = 0.1):
         '''
         @param argv: Command line options for IPython
         @type argv: list
         @param user_ns: User namespace.
         @type user_ns: dictionary
         @param user_global_ns: User global namespace.
         @type user_global_ns: dictionary.
         @param cin: Console standard input.
         @type cin: IO stream
         @param cout: Console standard output.
         @type cout: IO stream
         @param cerr: Console standard error.
         @type cerr: IO stream
         @param exit_handler: Replacement for builtin exit() function
         @type exit_handler: function
         @param time_loop: Define the sleep time between two thread's loop
         @type int
         '''
         Thread.__init__(self)
 
         #first we redefine in/out/error functions of IPython 
         if cin:
             IPython.Shell.Term.cin = cin
         if cout:
             IPython.Shell.Term.cout = cout
         if cerr:
             IPython.Shell.Term.cerr = cerr
         
         # This is to get rid of the blockage that accurs during
         # IPython.Shell.InteractiveShell.user_setup()
         IPython.iplib.raw_input = lambda x: None
 
         self._term = IPython.genutils.IOTerm(cin=cin, cout=cout, cerr=cerr)
 
         excepthook = sys.excepthook
         self._IP = IPython.Shell.make_IPython(
                                             argv,user_ns=user_ns,
                                             user_global_ns=user_global_ns,
                                             embedded=True,
                                             shell_class=IPython.Shell.InteractiveShell)
 
         #we replace IPython default encoding by wx locale encoding
 	loc = locale.getpreferredencoding()
 	if loc:
         	self._IP.stdin_encoding = loc
         #we replace the ipython default pager by our pager
         #FIXME: add a pager callback to IPython
         IPython.OInspect.page = self._pager
         IPython.genutils.page = self._pager
         IPython.iplib.page = self._pager
+        IPython.Magic.page = self._pager
         
         #we replace the ipython default shell command caller by our shell handler
 	#FIXME: any better solution welcome
         IPython.genutils.shell_ori = self._shell	#needed by windows
         self._IP.system = self._shell			#needed for linux
         #we replace the ipython default input command caller by our method
         IPython.iplib.raw_input_original = self._raw_input
         #we replace the ipython default exit command by our method
         self._IP.exit = self._setAskExit
             
         sys.excepthook = excepthook
 
         self._iter_more = 0
         self._history_level = 0
         self._complete_sep =  re.compile('[\s\{\}\[\]\(\)]')
         self._prompt = str(self._IP.outputcache.prompt1).strip()
 
         #thread working vars
         self._terminate = False
         self._time_loop = time_loop
         self._has_doc = False
         self._do_execute = False
         self._line_to_execute = ''
         self._doc_text = None
         self._ask_exit = False
 
     #----------------------- Thread management section ----------------------    
     def run (self):
         """
         Thread main loop
         The thread will run until self._terminate will be set to True via shutdown() function
         Command processing can be interrupted with Instance.raise_exc(KeyboardInterrupt) call in the
         GUI thread.
         """
         while(not self._terminate):
             try:
                 if self._do_execute:
                     self._doc_text = None
                     self._execute()
                     self._do_execute = False
                 
             except KeyboardInterrupt:
                 pass
 
             time.sleep(self._time_loop)
             
     def shutdown(self): 
         """
         Shutdown the tread
         """
         self._terminate = True
 
     def doExecute(self,line):
         """
         Tell the thread to process the 'line' command
         """
         self._do_execute = True
         self._line_to_execute = line
         
     def isExecuteDone(self):
         """
         Returns the processing state
         """
         return not self._do_execute
 
     #----------------------- IPython management section ----------------------    
     def getAskExit(self):
         '''
         returns the _ask_exit variable that can be checked by GUI to see if
         IPython request an exit handling
         '''
         return self._ask_exit
 
     def clearAskExit(self):
         '''
         clear the _ask_exit var when GUI as handled the request.
         '''
         self._ask_exit = False
         
     def getDocText(self):
         """
         Returns the output of the processing that need to be paged (if any)
 
         @return: The std output string.
         @rtype: string
         """
         return self._doc_text
         
     def getBanner(self):
         """
         Returns the IPython banner for useful info on IPython instance
 
         @return: The banner string.
         @rtype: string
         """
         return self._IP.BANNER
     
     def getPromptCount(self):
         """
         Returns the prompt number.
         Each time a user execute a line in the IPython shell the prompt count is increased
 
         @return: The prompt number
         @rtype: int
         """
         return self._IP.outputcache.prompt_count
 
     def getPrompt(self):
         """
         Returns current prompt inside IPython instance
         (Can be In [...]: ot ...:)
 
         @return: The current prompt.
         @rtype: string
         """
         return self._prompt
 
     def getIndentation(self):
         """
         Returns the current indentation level
         Usefull to put the caret at the good start position if we want to do autoindentation.
 
         @return: The indentation level.
         @rtype: int
         """
         return self._IP.indent_current_nsp
         
     def updateNamespace(self, ns_dict):
         '''
         Add the current dictionary to the shell namespace.
 
         @param ns_dict: A dictionary of symbol-values.
         @type ns_dict: dictionary
         '''
         self._IP.user_ns.update(ns_dict)
 
     def complete(self, line):
         '''
         Returns an auto completed line and/or posibilities for completion.
 
         @param line: Given line so far.
         @type line: string
 
         @return: Line completed as for as possible,
         and possible further completions.
         @rtype: tuple
         '''
         split_line = self._complete_sep.split(line)
         possibilities = self._IP.complete(split_line[-1])
         if possibilities:
 
             def _commonPrefix(str1, str2):
                 '''
                 Reduction function. returns common prefix of two given strings.
 
                 @param str1: First string.
                 @type str1: string
                 @param str2: Second string
                 @type str2: string
 
                 @return: Common prefix to both strings.
                 @rtype: string
                 '''
                 for i in range(len(str1)):
                     if not str2.startswith(str1[:i+1]):
                         return str1[:i]
                 return str1
             common_prefix = reduce(_commonPrefix, possibilities)
             completed = line[:-len(split_line[-1])]+common_prefix
         else:
             completed = line
         return completed, possibilities
 
     def historyBack(self):
         '''
         Provides one history command back.
 
         @return: The command string.
         @rtype: string
         '''
         history = ''
         #the below while loop is used to suppress empty history lines
 	while((history == '' or history == '\n') and self._history_level >0):
 		if self._history_level>=1:
 			self._history_level -= 1
 		history = self._getHistory()		
         return history
 
     def historyForward(self):
         '''
         Provides one history command forward.
 
         @return: The command string.
         @rtype: string
         '''
 	history = ''
 	#the below while loop is used to suppress empty history lines
 	while((history == '' or history == '\n') and self._history_level <= self._getHistoryMaxIndex()):
 		if self._history_level < self._getHistoryMaxIndex():
 			self._history_level += 1
 			history = self._getHistory()
 		else:
 			if self._history_level == self._getHistoryMaxIndex():
 				history = self._getHistory()
 				self._history_level += 1
 			else:
 				history = ''
         return history
 
     def initHistoryIndex(self):
         '''
         set history to last command entered
         '''
         self._history_level = self._getHistoryMaxIndex()+1
 
     #----------------------- IPython PRIVATE management section ----------------------    
     def _setAskExit(self):
         '''
         set the _ask_exit variable that can be cjhecked by GUI to see if
         IPython request an exit handling
         '''
         self._ask_exit = True
         
     def _getHistoryMaxIndex(self):
         '''
         returns the max length of the history buffer
 
         @return: history length
         @rtype: int
         '''
         return len(self._IP.input_hist_raw)-1
         
     def _getHistory(self):
         '''
         Get's the command string of the current history level.
 
         @return: Historic command string.
         @rtype: string
         '''
         rv = self._IP.input_hist_raw[self._history_level].strip('\n')
         return rv
 
     def _pager(self,text,start=0,screen_lines=0,pager_cmd = None):
         '''
         This function is used as a callback replacment to IPython pager function
 
         It puts the 'text' value inside the self._doc_text string that can be retrived via getDocText
         function.
         '''
         self._doc_text = text
     
     def _raw_input(self, prompt=''):
         '''
         Custom raw_input() replacement. Get's current line from console buffer.
 
         @param prompt: Prompt to print. Here for compatability as replacement.
         @type prompt: string
 
         @return: The current command line text.
         @rtype: string
         '''
         return self._line_to_execute
 
     def _execute(self):
         '''
         Executes the current line provided by the shell object.
         '''
         orig_stdout = sys.stdout
         sys.stdout = IPython.Shell.Term.cout
                 
         try:
             line = self._IP.raw_input(None, self._iter_more)
             if self._IP.autoindent:
                 self._IP.readline_startup_hook(None)
 
         except KeyboardInterrupt:
             self._IP.write('\nKeyboardInterrupt\n')
             self._IP.resetbuffer()
             # keep cache in sync with the prompt counter:
             self._IP.outputcache.prompt_count -= 1
 
             if self._IP.autoindent:
                 self._IP.indent_current_nsp = 0
             self._iter_more = 0
         except:
             self._IP.showtraceback()
         else:
             self._iter_more = self._IP.push(line)
             if (self._IP.SyntaxTB.last_syntax_error and
                     self._IP.rc.autoedit_syntax):
                 self._IP.edit_syntax_error()
         if self._iter_more:
             self._prompt = str(self._IP.outputcache.prompt2).strip()
             if self._IP.autoindent:
                 self._IP.readline_startup_hook(self._IP.pre_readline)
         else:
             self._prompt = str(self._IP.outputcache.prompt1).strip()
             self._IP.indent_current_nsp = 0 #we set indentation to 0
         sys.stdout = orig_stdout
     
     def _shell(self, cmd,verbose=0,debug=0,header=''):
         '''
         Replacement method to allow shell commands without them blocking.
 
         @param cmd: Shell command to execute.
         @type cmd: string
         @param verbose: Verbosity
         @type verbose: integer
         @param debug: Debug level
         @type debug: integer
         @param header: Header to be printed before output
         @type header: string
         '''
         if verbose or debug: print header+cmd
         # flush stdout so we don't mangle python's buffering
         if not debug:
             stdin, stdout = os.popen4(cmd)
             result = stdout.read().decode('cp437').encode(locale.getpreferredencoding())
             #we use print command because the shell command is called inside IPython instance and thus is
             #redirected to thread cout
             #"\x01\x1b[1;36m\x02" <-- add colour to the text...
             print "\x01\x1b[1;36m\x02"+result
             stdout.close()
             stdin.close()
 
 class WxConsoleView(stc.StyledTextCtrl):
     '''
     Specialized styled text control view for console-like workflow.
     We use here a scintilla frontend thus it can be reused in any GUI taht supports
     scintilla with less work.
 
     @cvar ANSI_COLORS_BLACK: Mapping of terminal colors to X11 names.(with Black background)
     @type ANSI_COLORS_BLACK: dictionary
 
     @cvar ANSI_COLORS_WHITE: Mapping of terminal colors to X11 names.(with White background)
     @type ANSI_COLORS_WHITE: dictionary
 
     @ivar color_pat: Regex of terminal color pattern
     @type color_pat: _sre.SRE_Pattern
     '''
     ANSI_STYLES_BLACK ={'0;30': [0,'WHITE'],             '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']}
 
     ANSI_STYLES_WHITE ={'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']}
 
     def __init__(self,parent,prompt,intro="",background_color="BLACK",pos=wx.DefaultPosition, ID = -1, size=wx.DefaultSize,
                  style=0):
         '''
         Initialize console view.
 
         @param parent: Parent widget
         @param prompt: User specified prompt
         @type intro: string
         @param intro: User specified startup introduction string
         @type intro: string
         @param background_color: Can be BLACK or WHITE
         @type background_color: string
         @param other: init param of styledTextControl (can be used as-is)
         '''
         stc.StyledTextCtrl.__init__(self, parent, ID, pos, size, style)
 
         ####### Scintilla configuration ##################################################
         
         # Ctrl + B or Ctrl + N can be used to zoomin/zoomout the text inside the widget
         self.CmdKeyAssign(ord('B'), stc.STC_SCMOD_CTRL, stc.STC_CMD_ZOOMIN)
         self.CmdKeyAssign(ord('N'), stc.STC_SCMOD_CTRL, stc.STC_CMD_ZOOMOUT)
 
         #we define platform specific fonts
         if wx.Platform == '__WXMSW__':
                 faces = { 'times': 'Times New Roman',
                           'mono' : 'Courier New',
                           'helv' : 'Arial',
                           'other': 'Comic Sans MS',
                           'size' : 10,
                           'size2': 8,
                          }
         elif wx.Platform == '__WXMAC__':
             faces = { 'times': 'Times New Roman',
                       'mono' : 'Monaco',
                       'helv' : 'Arial',
                       'other': 'Comic Sans MS',
                       'size' : 10,
                       'size2': 8,
                      }
         else:
             faces = { 'times': 'Times',
                       'mono' : 'Courier',
                       'helv' : 'Helvetica',
                       'other': 'new century schoolbook',
                       'size' : 10,
                       'size2': 8,
                      }
 
         #We draw a line at position 80
         self.SetEdgeMode(stc.STC_EDGE_LINE)
         self.SetEdgeColumn(80)
         self.SetEdgeColour(wx.LIGHT_GREY)
 
         #self.SetViewWhiteSpace(True)
         #self.SetViewEOL(True)
         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.EnsureCaretVisible()
         
         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)
 
         # make some styles
         if background_color != "BLACK":
             self.background_color = "WHITE"
             self.SetCaretForeground("BLACK")
             self.ANSI_STYLES = self.ANSI_STYLES_WHITE
         else:
             self.background_color = background_color
             self.SetCaretForeground("WHITE")
             self.ANSI_STYLES = self.ANSI_STYLES_BLACK
 
         self.StyleSetSpec(stc.STC_STYLE_DEFAULT, "fore:%s,back:%s,size:%d,face:%s" % (self.ANSI_STYLES['0;30'][1],
                                                                                       self.background_color,
                                                                                       faces['size'], faces['mono']))
         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])
         
         #######################################################################
         
         self.indent = 0
         self.prompt_count = 0
         self.color_pat = re.compile('\x01?\x1b\[(.*?)m\x02?')
         
         self.write(intro)
         self.setPrompt(prompt)
         self.showPrompt()
         
         self.Bind(wx.EVT_KEY_DOWN, self._onKeypress, self)
         #self.Bind(stc.EVT_STC_UPDATEUI, self.OnUpdateUI)
 
     def write(self, text):
         '''
         Write given text to buffer.
 
         @param text: Text to append.
         @type text: string
         '''
         segments = self.color_pat.split(text)
         segment = segments.pop(0)
         self.StartStyling(self.getCurrentLineEnd(),0xFF)
         self.AppendText(segment)
         
         if segments:
             ansi_tags = self.color_pat.findall(text)
 
             for tag in ansi_tags:
                 i = segments.index(tag)
                 self.StartStyling(self.getCurrentLineEnd(),0xFF)
                 self.AppendText(segments[i+1])
 
                 if tag != '0':
                     self.SetStyling(len(segments[i+1]),self.ANSI_STYLES[tag][0])
 
                 segments.pop(i)
                 
         self.moveCursor(self.getCurrentLineEnd())
          
     def getPromptLen(self):
         '''
         Return the length of current prompt
         '''
         return len(str(self.prompt_count)) + 7
 
     def setPrompt(self,prompt):
         self.prompt = prompt
 
     def setIndentation(self,indentation):
         self.indent = indentation
         
     def setPromptCount(self,count):
         self.prompt_count = count
         
     def showPrompt(self):
         '''
         Prints prompt at start of line.
 
         @param prompt: Prompt to print.
         @type prompt: string
         '''
         self.write(self.prompt)
         #now we update the position of end of prompt
         self.current_start = self.getCurrentLineEnd()
         
         autoindent = self.indent*' '
         autoindent = autoindent.replace('    ','\t')
         self.write(autoindent)
         
     def changeLine(self, text):
         '''
         Replace currently entered command line with given text.
 
         @param text: Text to use as replacement.
         @type text: string
         '''
         self.SetSelection(self.getCurrentPromptStart(),self.getCurrentLineEnd())
         self.ReplaceSelection(text)
         self.moveCursor(self.getCurrentLineEnd())
 
     def getCurrentPromptStart(self):
         return self.current_start
 
     def getCurrentLineStart(self):
         return self.GotoLine(self.LineFromPosition(self.GetCurrentPos()))
 
     def getCurrentLineEnd(self):
         return self.GetLength()
 
     def getCurrentLine(self):
         '''
         Get text in current command line.
 
         @return: Text of current command line.
         @rtype: string
         '''
         return self.GetTextRange(self.getCurrentPromptStart(),
                                  self.getCurrentLineEnd())
 
     def showReturned(self, text):
         '''
         Show returned text from last command and print new prompt.
 
         @param text: Text to show.
         @type text: string
         '''
         self.write('\n'+text)
         if text:
             self.write('\n')
         self.showPrompt()
 
     def moveCursorOnNewValidKey(self):
         #If cursor is at wrong position put it at last line...
         if self.GetCurrentPos() < self.getCurrentPromptStart():
             self.GotoPos(self.getCurrentPromptStart())
         
     def removeFromTo(self,from_pos,to_pos):
         if from_pos < to_pos:
             self.SetSelection(from_pos,to_pos)
             self.DeleteBack()
                                                           
     def removeCurrentLine(self):
         self.LineDelete()
         
     def moveCursor(self,position):
         self.GotoPos(position)
 
     def getCursorPos(self):
         return self.GetCurrentPos()
 
     def selectFromTo(self,from_pos,to_pos):
         self.SetSelectionStart(from_pos)
         self.SetSelectionEnd(to_pos)
         
     def writeHistory(self,history):
         self.removeFromTo(self.getCurrentPromptStart(),self.getCurrentLineEnd())
         self.changeLine(history)
         
     def writeCompletion(self, possibilities):
         max_len = len(max(possibilities,key=len))
         max_symbol =' '*max_len
         
         #now we check how much symbol we can put on a line...
         cursor_pos = self.getCursorPos()
         test_buffer = max_symbol + ' '*4
         current_lines = self.GetLineCount()
         
         allowed_symbols = 80/len(test_buffer)
         if allowed_symbols == 0:
                 allowed_symbols = 1
         
         pos = 1
         buf = ''
         for symbol in possibilities:
             #buf += symbol+'\n'#*spaces)
             if pos<allowed_symbols:
                 spaces = max_len - len(symbol) + 4
                 buf += symbol+' '*spaces
                 pos += 1
             else:
                 buf+=symbol+'\n'
                 pos = 1
         self.write(buf)
                              
     def _onKeypress(self, event, skip=True):
         '''
         Key press callback used for correcting behavior for console-like
         interfaces. For example 'home' should go to prompt, not to begining of
         line.
 
         @param widget: Widget that key press accored in.
         @type widget: gtk.Widget
         @param event: Event object
         @type event: gtk.gdk.Event
 
         @return: Return True if event as been catched.
         @rtype: boolean
         '''
 	
         if event.GetKeyCode() == wx.WXK_HOME:
             if event.Modifiers == wx.MOD_NONE:
                 self.moveCursorOnNewValidKey()
                 self.moveCursor(self.getCurrentPromptStart())
                 return True
             elif event.Modifiers == wx.MOD_SHIFT:
                 self.moveCursorOnNewValidKey()
                 self.selectFromTo(self.getCurrentPromptStart(),self.getCursorPos())
                 return True
             else:
                 return False
 
         elif event.GetKeyCode() == wx.WXK_LEFT:
             if event.Modifiers == wx.MOD_NONE:
                 self.moveCursorOnNewValidKey()
                 
                 self.moveCursor(self.getCursorPos()-1)
                 if self.getCursorPos() < self.getCurrentPromptStart():
                     self.moveCursor(self.getCurrentPromptStart())
                 return True
 
         elif event.GetKeyCode() == wx.WXK_BACK:
             self.moveCursorOnNewValidKey()
 	    if self.getCursorPos() > self.getCurrentPromptStart():
                 self.removeFromTo(self.getCursorPos()-1,self.getCursorPos())
 	    return True
         
         if skip:
             if event.GetKeyCode() not in [wx.WXK_PAGEUP,wx.WXK_PAGEDOWN] and event.Modifiers == wx.MOD_NONE:
                 self.moveCursorOnNewValidKey()
                 
             event.Skip()
             return True
         return False
 
     def OnUpdateUI(self, evt):
         # check for matching braces
         braceAtCaret = -1
         braceOpposite = -1
         charBefore = None
         caretPos = self.GetCurrentPos()
 
         if caretPos > 0:
             charBefore = self.GetCharAt(caretPos - 1)
             styleBefore = self.GetStyleAt(caretPos - 1)
 
         # check before
         if charBefore and chr(charBefore) in "[]{}()" and styleBefore == stc.STC_P_OPERATOR:
             braceAtCaret = caretPos - 1
 
         # check after
         if braceAtCaret < 0:
             charAfter = self.GetCharAt(caretPos)
             styleAfter = self.GetStyleAt(caretPos)
 
             if charAfter and chr(charAfter) in "[]{}()" and styleAfter == stc.STC_P_OPERATOR:
                 braceAtCaret = caretPos
 
         if braceAtCaret >= 0:
             braceOpposite = self.BraceMatch(braceAtCaret)
 
         if braceAtCaret != -1  and braceOpposite == -1:
             self.BraceBadLight(braceAtCaret)
         else:
             self.BraceHighlight(braceAtCaret, braceOpposite)
             #pt = self.PointFromPosition(braceOpposite)
             #self.Refresh(True, wxRect(pt.x, pt.y, 5,5))
             #print pt
             #self.Refresh(False)
         
 class WxIPythonViewPanel(wx.Panel):
     '''
     This is wx.Panel that embbed the IPython Thread and the wx.StyledTextControl
     If you want to port this to any other GUI toolkit, just replace the WxConsoleView
     by YOURGUIConsoleView and make YOURGUIIPythonView derivate from whatever container you want.
     I've choosed to derivate from a wx.Panel because it seems to be ore usefull
     Any idea to make it more 'genric' welcomed.
     '''
     def __init__(self,parent,exit_handler=None,intro=None,background_color="BLACK"):
         '''
         Initialize.
         Instanciate an IPython thread.
         Instanciate a WxConsoleView.
         Redirect I/O to console.
         '''
         wx.Panel.__init__(self,parent,-1)
 
         ### IPython thread instanciation ###
         self.cout = StringIO()
         self.IP = IterableIPShell(cout=self.cout,cerr=self.cout,
                              exit_handler = exit_handler,
                              time_loop = 0.1)
         self.IP.start()
         
         ### IPython wx console view instanciation ###
         #If user didn't defined an intro text, we create one for him
         #If you really wnat an empty intrp just call wxIPythonViewPanel with intro=''
         if intro == None:
             welcome_text = "Welcome to WxIPython Shell.\n\n"
             welcome_text+= self.IP.getBanner()
             welcome_text+= "!command  -> Execute command in shell\n"
             welcome_text+= "TAB       -> Autocompletion\n"
 
         self.text_ctrl = WxConsoleView(self,
                                        self.IP.getPrompt(),
                                        intro=welcome_text,
                                        background_color=background_color)
         
         self.text_ctrl.Bind(wx.EVT_KEY_DOWN, self.keyPress, self.text_ctrl)
 
         ### making the layout of the panel ###
         sizer = wx.BoxSizer(wx.VERTICAL)
         sizer.Add(self.text_ctrl, 1, wx.EXPAND)
         self.SetAutoLayout(True)
         sizer.Fit(self)
         sizer.SetSizeHints(self)
         self.SetSizer(sizer)
         #and we focus on the widget :)
         self.SetFocus()
 
         ### below are the thread communication variable ###
         # the IPython thread is managed via unidirectional communication.
         # It's a thread slave that can't interact by itself with the GUI.
         # When the GUI event loop is done runStateMachine() is called and the thread sate is then
         # managed.
         
         #Initialize the state machine #kept for information
         #self.states = ['IDLE',
         #               'DO_EXECUTE_LINE',
         #               'WAIT_END_OF_EXECUTION',
         #               'SHOW_DOC',
         #               'SHOW_PROMPT']
         
         self.cur_state = 'IDLE'
 	self.pager_state = 'DONE'
         #wx.CallAfter(self.runStateMachine)
 
         # This creates a new Event class and a EVT binder function
         (self.AskExitEvent, EVT_ASK_EXIT) = wx.lib.newevent.NewEvent()
 
         self.Bind(wx.EVT_IDLE, self.runStateMachine)
         self.Bind(EVT_ASK_EXIT, exit_handler)
         
     def __del__(self):
         self.IP.shutdown()
         self.IP.join()
         WxConsoleView.__del__()
         
     #---------------------------- IPython Thread Management ---------------------------------------
     def runStateMachine(self,event):
         #print >>self.sys_stdout,"state:",self.cur_state
         self.updateStatusTracker(self.cur_state)
         
         if self.cur_state == 'DO_EXECUTE_LINE':
             #print >>self.sys_stdout,"command:",self.getCurrentLine()
             self.IP.doExecute(self.text_ctrl.getCurrentLine().replace('\t',' '*4))
             self.updateHistoryTracker(self.text_ctrl.getCurrentLine())
             self.cur_state = 'WAIT_END_OF_EXECUTION'
         
         if self.cur_state == 'WAIT_END_OF_EXECUTION':
             if self.IP.isExecuteDone():
                 self.doc = self.IP.getDocText()
                 if self.IP.getAskExit():
                     evt = self.AskExitEvent()
                     wx.PostEvent(self, evt)
                     self.IP.clearAskExit()
                 if self.doc:
                     self.pager_state = 'INIT'
 		    self.cur_state = 'SHOW_DOC'
                 else:
                     self.cur_state = 'SHOW_PROMPT'
                 
         if self.cur_state == 'SHOW_PROMPT':
             self.text_ctrl.setPrompt(self.IP.getPrompt())
             self.text_ctrl.setIndentation(self.IP.getIndentation())
             self.text_ctrl.setPromptCount(self.IP.getPromptCount())
             rv = self.cout.getvalue()
             if rv: rv = rv.strip('\n')
             self.text_ctrl.showReturned(rv)
             self.cout.truncate(0)
 	    self.IP.initHistoryIndex()
             self.cur_state = 'IDLE'
             
         if self.cur_state == 'SHOW_DOC':
             self.pager(self.doc)
             if self.pager_state == 'DONE':
                 self.cur_state = 'SHOW_PROMPT'
                 
         event.Skip()
 
     #---------------------------- IPython pager ---------------------------------------
     def pager(self,text):#,start=0,screen_lines=0,pager_cmd = None):
         if self.pager_state == 'WAITING':
 		#print >>self.sys_stdout,"PAGER waiting"
         	return
 	
 	if self.pager_state == 'INIT':
 		#print >>self.sys_stdout,"PAGER state:",self.pager_state
         	self.pager_lines = text[7:].split('\n')
 		self.pager_nb_lines = len(self.pager_lines)
 		self.pager_index = 0
 		self.pager_do_remove = False
 		self.text_ctrl.write('\n')
 		self.pager_state = 'PROCESS_LINES'
 		
 	if self.pager_state == 'PROCESS_LINES':
         	#print >>self.sys_stdout,"PAGER state:",self.pager_state
         	if self.pager_do_remove == True:
 			self.text_ctrl.removeCurrentLine()
 			self.pager_do_remove = False
 	
 		if self.pager_nb_lines > 10:
 	                #print >>self.sys_stdout,"PAGER processing 10 lines"
 			if self.pager_index > 0:
 				self.text_ctrl.write(">\x01\x1b[1;36m\x02"+self.pager_lines[self.pager_index]+'\n')
 			else:
 				self.text_ctrl.write("\x01\x1b[1;36m\x02 "+self.pager_lines[self.pager_index]+'\n')
 			
 			for line in self.pager_lines[self.pager_index+1:self.pager_index+9]:
 				self.text_ctrl.write("\x01\x1b[1;36m\x02 "+line+'\n')
 			self.pager_index += 10
 			self.pager_nb_lines -= 10
 			self.text_ctrl.write("--- Push Enter to continue or 'Q' to quit---")
 			self.pager_do_remove = True
 			self.pager_state = 'WAITING'
 			return
         	else:
 	                #print >>self.sys_stdout,"PAGER processing last lines"
 			if self.pager_nb_lines > 0:
 				if self.pager_index > 0:
 					self.text_ctrl.write(">\x01\x1b[1;36m\x02"+self.pager_lines[self.pager_index]+'\n')
 				else:
 					self.text_ctrl.write("\x01\x1b[1;36m\x02 "+self.pager_lines[self.pager_index]+'\n')
 				
 				self.pager_index += 1
                                 self.pager_nb_lines -= 1
 	              	if self.pager_nb_lines > 0:
         	        	for line in self.pager_lines[self.pager_index:]:
 					self.text_ctrl.write("\x01\x1b[1;36m\x02 "+line+'\n')
                 			self.pager_nb_lines = 0
 			self.pager_state = 'DONE'          
                 
     #---------------------------- Key Handler --------------------------------------------
     def keyPress(self, event):
         '''
         Key press callback with plenty of shell goodness, like history,
         autocompletions, etc.
         '''
 	
         if event.GetKeyCode() == ord('C'):
             if event.Modifiers == wx.MOD_CONTROL:
                 if self.cur_state == 'WAIT_END_OF_EXECUTION':
                     #we raise an exception inside the IPython thread container
                     self.IP.raise_exc(KeyboardInterrupt)
                     return
                 
         if event.KeyCode == wx.WXK_RETURN:
             if self.cur_state == 'IDLE':
                 #we change the state ot the state machine
                 self.cur_state = 'DO_EXECUTE_LINE'
                 return
             if self.pager_state == 'WAITING':
                 self.pager_state = 'PROCESS_LINES'
                 return
             
         if event.GetKeyCode() in [ord('q'),ord('Q')]:
             if self.pager_state == 'WAITING':
                 self.pager_state = 'DONE'
                 return
             
         #scroll_position = self.text_ctrl.GetScrollPos(wx.VERTICAL)
 	if self.cur_state == 'IDLE':
             if event.KeyCode == wx.WXK_UP:
                 history = self.IP.historyBack()
                 self.text_ctrl.writeHistory(history)
                 return
             if event.KeyCode == wx.WXK_DOWN:
                 history = self.IP.historyForward()
                 self.text_ctrl.writeHistory(history)
                 return
             if event.KeyCode == wx.WXK_TAB:
                 #if line empty we disable tab completion
                 if not self.text_ctrl.getCurrentLine().strip():
                     self.text_ctrl.write('\t')
                     return
                 completed, possibilities = self.IP.complete(self.text_ctrl.getCurrentLine())
                 if len(possibilities) > 1:
                     cur_slice = self.text_ctrl.getCurrentLine()
                     self.text_ctrl.write('\n')
                     self.text_ctrl.writeCompletion(possibilities)
                     self.text_ctrl.write('\n')
 
                     self.text_ctrl.showPrompt()
                     self.text_ctrl.write(cur_slice)
                 self.text_ctrl.changeLine(completed or cur_slice)
                 
                 return
             event.Skip()
 	
     #---------------------------- Hook Section --------------------------------------------
     def updateHistoryTracker(self,command_line):
         '''
         Default history tracker (does nothing)
         '''
         pass
     
     def setHistoryTrackerHook(self,func):
         '''
         Define a new history tracker
         '''
         self.updateHistoryTracker = func
     def updateStatusTracker(self,status):
         '''
         Default status tracker (does nothing)
         '''
         pass
     
     def setStatusTrackerHook(self,func):
         '''
         Define a new status tracker
         '''
         self.updateStatusTracker = func