pager cleanup

IPython/gui/wx/ipython_view.py

@@ -1,705 +1,702 b''
 #!/usr/bin/python
 # -*- coding: iso-8859-15 -*-
 '''
 Provides IPython WX console widgets.
 
 @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 StringIO import StringIO
 try:
         import IPython
 except Exception,e:
         raise "Error importing IPython (%s)" % str(e)
 
 
 from ipshell_nonblocking import NonBlockingIPShell
 
 class WxNonBlockingIPShell(NonBlockingIPShell):
     '''
     An NonBlockingIPShell Thread that is WX dependent.
     Thus it permits direct interaction with a WX GUI without OnIdle event state machine trick...
     '''
     def __init__(self,wx_instance,
                  argv=[],user_ns={},user_global_ns=None,
                  cin=None, cout=None, cerr=None,
                  ask_exit_handler=None):
         
         #user_ns['addGUIShortcut'] = self.addGUIShortcut
         NonBlockingIPShell.__init__(self,argv,user_ns,user_global_ns,
                                     cin, cout, cerr,
                                     ask_exit_handler)
 
         # This creates a new Event class and a EVT binder function
         (self.IPythonAskExitEvent, EVT_IP_ASK_EXIT) = wx.lib.newevent.NewEvent()
         #(self.IPythonAddButtonEvent, EVT_IP_ADD_BUTTON_EXIT) = \
         #                                     wx.lib.newevent.NewEvent()
         (self.IPythonExecuteDoneEvent, EVT_IP_EXECUTE_DONE) = \
                                             wx.lib.newevent.NewEvent()
 
         wx_instance.Bind(EVT_IP_ASK_EXIT, wx_instance.ask_exit_handler)
         #wx_instance.Bind(EVT_IP_ADD_BUTTON_EXIT, wx_instance.add_button_handler)
         wx_instance.Bind(EVT_IP_EXECUTE_DONE, wx_instance.evtStateExecuteDone)
 
         self.wx_instance = wx_instance
         self._IP.ask_exit = self._askExit
         self._IP.exit = self._askExit
         
     #def addGUIShortcut(self,text,func):
     #    evt = self.IPythonAddButtonEvent(
     #        button_info={   'text':text, 
     #                        'func':self.wx_instance.doExecuteLine(func)})
     #    wx.PostEvent(self.wx_instance, evt)
                     
     def _askExit(self):
         evt = self.IPythonAskExitEvent()
         wx.PostEvent(self.wx_instance, evt)
 
     def _afterExecute(self):
         evt = self.IPythonExecuteDoneEvent()
         wx.PostEvent(self.wx_instance, evt)
 
                 
 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, ask_exit_handler=None, intro=None,
                  background_color="BLACK", add_button_handler=None, 
                  wx_ip_shell=None,
                  ):
         '''
         Initialize.
         Instanciate an IPython thread.
         Instanciate a WxConsoleView.
         Redirect I/O to console.
         '''
         wx.Panel.__init__(self,parent,-1)
 
         ### IPython non blocking shell instanciation ###
         self.cout = StringIO()
 
         self.add_button_handler = add_button_handler
         self.ask_exit_handler = ask_exit_handler
 
         if wx_ip_shell is not None:
             self.IP = wx_ip_shell
         else:
             self.IP = WxNonBlockingIPShell(self,
                                     cout=self.cout,cerr=self.cout,
                                     ask_exit_handler = ask_exit_handler)
 
         ### 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()
 
         #widget state management (for key handling different cases)
         self.setCurrentState('IDLE')
         self.pager_state = 'DONE'
         
     def __del__(self):
         WxConsoleView.__del__()
         
     #---------------------------- IPython Thread Management ---------------------------------------
     def stateDoExecuteLine(self):
         #print >>sys.__stdout__,"command:",self.getCurrentLine()
         line=self.text_ctrl.getCurrentLine()
         self.IP.doExecute(line.replace('\t',' '*4))
         self.updateHistoryTracker(self.text_ctrl.getCurrentLine())
         self.setCurrentState('WAIT_END_OF_EXECUTION')
         
     def evtStateExecuteDone(self,evt):
         self.doc = self.IP.getDocText()
         self.help = self.IP.getHelpText()
         if self.doc:
             self.pager_lines = self.doc[7:].split('\n')
 	    self.pager_state = 'INIT'
             self.setCurrentState('SHOW_DOC')
             self.pager(self.doc)
         elif self.help:
             self.pager_lines = self.help.split('\n')
 	    self.pager_state = 'INIT'
             self.setCurrentState('SHOW_DOC')
             self.pager(self.help)                
         else:
             self.stateShowPrompt()
 
     def stateShowPrompt(self):
         self.setCurrentState('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.setCurrentState('IDLE')
 
     def setCurrentState(self, state):
         self.cur_state = state
         self.updateStatusTracker(self.cur_state)
         
     #---------------------------- IPython pager ---------------------------------------
     def pager(self,text):#,start=0,screen_lines=0,pager_cmd = None):
-        if self.pager_state == 'WAITING':
-		#print >>sys.__stdout__,"PAGER waiting"
-        	return
-	
-	if self.pager_state == 'INIT':
+
+        if self.pager_state == 'INIT':
 		#print >>sys.__stdout__,"PAGER state:",self.pager_state
                 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 >>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 >>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 >>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'
 			self.stateShowPrompt()
                 
     #---------------------------- 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.ce.raise_exc(KeyboardInterrupt)
                     return
                 
         if event.KeyCode == wx.WXK_RETURN:
             if self.cur_state == 'IDLE':
                 #we change the state ot the state machine
                 self.setCurrentState('DO_EXECUTE_LINE')
                 self.stateDoExecuteLine()
                 return
             if self.pager_state == 'WAITING':
                 self.pager_state = 'PROCESS_LINES'
                 self.pager(self.doc)
                 return
             
         if event.GetKeyCode() in [ord('q'),ord('Q')]:
             if self.pager_state == 'WAITING':
                 self.pager_state = 'DONE'
                 self.stateShowPrompt()
                 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