Geografic-Information-System/gui/wxpython/gui_core/goutput.py

"""!
@package gui_core.goutput

@brief Command output widgets

Classes:
 - goutput::GConsoleWindow
 - goutput::GStc
 - goutput::GConsoleFrame

(C) 2007-2012 by the GRASS Development Team

This program is free software under the GNU General Public License
(>=v2). Read the file COPYING that comes with GRASS for details.

@author Michael Barton (Arizona State University)
@author Martin Landa <landa.martin gmail.com>
@author Vaclav Petras <wenzeslaus gmail.com>  (refactoring)
@author Anna Kratochvilova <kratochanna gmail.com> (refactoring)
"""

import os
import sys
import textwrap

sys.path.append(os.path.join(os.environ['GISBASE'], "etc", "gui", "wxpython"))

import wx
from   wx import stc
from wx.lib.newevent import NewEvent

from core.gcmd       import GError, EncodeString
from core.events     import gShowNotification
from core.gconsole   import GConsole, \
    EVT_CMD_OUTPUT, EVT_CMD_PROGRESS, EVT_CMD_RUN, EVT_CMD_DONE, \
    EVT_WRITE_LOG, EVT_WRITE_CMD_LOG, EVT_WRITE_WARNING, EVT_WRITE_ERROR
from gui_core.prompt import GPromptSTC, EVT_GPROMPT_RUN_CMD
from core.settings   import UserSettings
from gui_core.widgets import SearchModuleWidget, EVT_MODULE_SELECTED
from core.modulesdata import ModulesData


GC_EMPTY = 0
GC_SEARCH = 1
GC_PROMPT = 2


# occurs when a content of console output window was changed
# some similar event exists in GConsole this will be not neccessary
gGcContentChanged, EVT_GC_CONTENT_CHANGED = NewEvent()


class GConsoleWindow(wx.SplitterWindow):
    """!Create and manage output console for commands run by GUI.
    """
    def __init__(self, parent, gconsole, margin = False,
                 style = wx.TAB_TRAVERSAL | wx.FULL_REPAINT_ON_RESIZE,
                 gcstyle = GC_EMPTY,
                 **kwargs):
        """!
        @param parent gui parent
        @param margin use margin in output pane (GStc)
        @param style wx.SplitterWindow style
        @param gcstyle GConsole style
        (GC_EMPTY, GC_PROMPT to show command prompt,
        GC_SEARCH to show search widget)
        @param ignoredCmdPattern regular expression specifying commads
        to be ignored (e.g. @c '^d\..*' for display commands)
        """
        wx.SplitterWindow.__init__(self, parent, id = wx.ID_ANY, style = style, **kwargs)
        self.SetName("GConsole")
        
        self.panelOutput = wx.Panel(parent = self, id = wx.ID_ANY)
        self.panelPrompt = wx.Panel(parent = self, id = wx.ID_ANY)

        # initialize variables
        self.parent = parent # GMFrame | CmdPanel | ?
        self._gconsole = gconsole

        self._gcstyle = gcstyle
        self.lineWidth       = 80

        # progress bar
        self.progressbar = wx.Gauge(parent = self.panelOutput, id = wx.ID_ANY,
                                    range = 100, pos = (110, 50), size = (-1, 25),
                                    style = wx.GA_HORIZONTAL)
        self._gconsole.Bind(EVT_CMD_PROGRESS, self.OnCmdProgress)
        self._gconsole.Bind(EVT_CMD_OUTPUT, self.OnCmdOutput)
        self._gconsole.Bind(EVT_CMD_RUN, self.OnCmdRun)
        self._gconsole.Bind(EVT_CMD_DONE, self.OnCmdDone)
        self._gconsole.Bind(EVT_WRITE_LOG,
                            lambda event:
                                self.WriteLog(text = event.text,
                                              wrap = event.wrap,
                                              switchPage = event.switchPage,
                                              priority = event.priority))
        self._gconsole.Bind(EVT_WRITE_CMD_LOG,
                            lambda event:
                                self.WriteCmdLog(line = event.line,
                                                 pid = event.pid,
                                                 switchPage = event.switchPage))
        self._gconsole.Bind(EVT_WRITE_WARNING,
                            lambda event:
                                self.WriteWarning(line = event.line))
        self._gconsole.Bind(EVT_WRITE_ERROR,
                            lambda event:
                                self.WriteError(line = event.line))

        # text control for command output
        self.cmdOutput = GStc(parent = self.panelOutput, id = wx.ID_ANY, margin = margin,
                               wrap = None)
        self.cmdOutput.Bind(stc.EVT_STC_CHANGE, self.OnStcChanged)

        # information about available modules
        modulesData = ModulesData()

        # search & command prompt
        # move to the if below
        # search depends on cmd prompt
        self.cmdPrompt = GPromptSTC(parent = self, modulesData = modulesData)
        self.cmdPrompt.Bind(EVT_GPROMPT_RUN_CMD, 
                            lambda event:
                                self._gconsole.RunCmd(command = event.cmd))

        if not self._gcstyle & GC_PROMPT:
            self.cmdPrompt.Hide()


        if self._gcstyle & GC_SEARCH:
            self.infoCollapseLabelExp = _("Click here to show search module engine")
            self.infoCollapseLabelCol = _("Click here to hide search module engine")
            self.searchPane = wx.CollapsiblePane(parent = self.panelOutput,
                                                 label = self.infoCollapseLabelExp,
                                                 style = wx.CP_DEFAULT_STYLE |
                                                 wx.CP_NO_TLW_RESIZE | wx.EXPAND)
            self.MakeSearchPaneContent(self.searchPane.GetPane(), modulesData)
            self.searchPane.Collapse(True)
            self.Bind(wx.EVT_COLLAPSIBLEPANE_CHANGED, self.OnSearchPaneChanged, self.searchPane) 
            self.search.Bind(EVT_MODULE_SELECTED,
                             lambda event:
                                 self.cmdPrompt.SetTextAndFocus(event.name + ' '))
        else:
            self.search = None

        self.outputBox = wx.StaticBox(parent = self.panelOutput, id = wx.ID_ANY,
                                      label = " %s " % _("Output window"))

        if self._gcstyle & GC_PROMPT:
            cmdLabel = _("Command prompt")
        else:
            cmdLabel = _("Command")
        self.cmdBox = wx.StaticBox(parent = self.panelOutput, id = wx.ID_ANY,
                                   label = " %s " % cmdLabel)

        # buttons
        self.btnOutputClear = wx.Button(parent = self.panelOutput, id = wx.ID_CLEAR)
        self.btnOutputClear.SetToolTipString(_("Clear output window content"))
        self.btnCmdClear = wx.Button(parent = self.panelOutput, id = wx.ID_CLEAR)
        self.btnCmdClear.SetToolTipString(_("Clear command prompt content"))
        self.btnOutputSave  = wx.Button(parent = self.panelOutput, id = wx.ID_SAVE)
        self.btnOutputSave.SetToolTipString(_("Save output window content to the file"))
        self.btnCmdAbort = wx.Button(parent = self.panelOutput, id = wx.ID_STOP)
        self.btnCmdAbort.SetToolTipString(_("Abort running command"))
        self.btnCmdAbort.Enable(False)
        self.btnCmdProtocol = wx.ToggleButton(parent = self.panelOutput, id = wx.ID_ANY,
                                              label = _("&Protocol"),
                                              size = self.btnCmdClear.GetSize())
        self.btnCmdProtocol.SetToolTipString(_("Toggle to save list of executed commands into file; "
                                               "content saved when switching off."))
        
        if not self._gcstyle & GC_PROMPT:
            self.btnCmdClear.Hide()
            self.btnCmdProtocol.Hide()
        
        self.btnCmdClear.Bind(wx.EVT_BUTTON,     self.cmdPrompt.OnCmdErase)
        self.btnOutputClear.Bind(wx.EVT_BUTTON,  self.OnOutputClear)
        self.btnOutputSave.Bind(wx.EVT_BUTTON,   self.OnOutputSave)
        self.btnCmdAbort.Bind(wx.EVT_BUTTON,     self._gconsole.OnCmdAbort)
        self.btnCmdProtocol.Bind(wx.EVT_TOGGLEBUTTON, self.OnCmdProtocol)
        
        self._layout()
        
    def _layout(self):
        """!Do layout"""
        outputSizer = wx.BoxSizer(wx.VERTICAL)
        btnSizer = wx.BoxSizer(wx.HORIZONTAL)
        outBtnSizer = wx.StaticBoxSizer(self.outputBox, wx.HORIZONTAL)
        cmdBtnSizer = wx.StaticBoxSizer(self.cmdBox, wx.HORIZONTAL)
        
        if self._gcstyle & GC_PROMPT:
            promptSizer = wx.BoxSizer(wx.VERTICAL)
            promptSizer.Add(item = self.cmdPrompt, proportion = 1,
                        flag = wx.EXPAND | wx.LEFT | wx.RIGHT | wx.TOP, border = 3)
        
        if self._gcstyle & GC_SEARCH:
            outputSizer.Add(item = self.searchPane, proportion = 0,
                            flag = wx.EXPAND | wx.ALL, border = 3)
        outputSizer.Add(item = self.cmdOutput, proportion = 1,
                        flag = wx.EXPAND | wx.ALL, border = 3)
        outputSizer.Add(item = self.progressbar, proportion = 0,
                        flag = wx.EXPAND | wx.LEFT | wx.RIGHT, border = 3)
        outBtnSizer.Add(item = self.btnOutputClear, proportion = 1,
                        flag = wx.ALIGN_LEFT | wx.LEFT | wx.RIGHT, border = 5)
        outBtnSizer.Add(item = self.btnOutputSave, proportion = 1,
                        flag = wx.ALIGN_RIGHT | wx.RIGHT, border = 5)
        
        cmdBtnSizer.Add(item = self.btnCmdProtocol, proportion = 1,
                        flag = wx.ALIGN_CENTER | wx.ALIGN_CENTER_VERTICAL | wx.LEFT | wx.RIGHT, border = 5)
        cmdBtnSizer.Add(item = self.btnCmdClear, proportion = 1,
                        flag = wx.ALIGN_CENTER | wx.RIGHT, border = 5)
        cmdBtnSizer.Add(item = self.btnCmdAbort, proportion = 1,
                        flag = wx.ALIGN_CENTER | wx.RIGHT, border = 5)
        
        if self._gcstyle & GC_PROMPT:
            proportion = (2, 3)
        else:
            proportion = (1, 1)
        
        btnSizer.Add(item = outBtnSizer, proportion = proportion[0],
                     flag = wx.ALL | wx.ALIGN_CENTER, border = 5)
        btnSizer.Add(item = cmdBtnSizer, proportion = proportion[1],
                     flag = wx.ALIGN_CENTER | wx.TOP | wx.BOTTOM | wx.RIGHT, border = 5)
        outputSizer.Add(item = btnSizer, proportion = 0,
                        flag = wx.EXPAND)
        
        outputSizer.Fit(self)
        outputSizer.SetSizeHints(self)
        self.panelOutput.SetSizer(outputSizer)
        # eliminate gtk_widget_size_allocate() warnings
        outputSizer.SetVirtualSizeHints(self.panelOutput)
        
        if self._gcstyle & GC_PROMPT:
            promptSizer.Fit(self)
            promptSizer.SetSizeHints(self)
            self.panelPrompt.SetSizer(promptSizer)
        
        # split window
        if self._gcstyle & GC_PROMPT:
            self.SplitHorizontally(self.panelOutput, self.panelPrompt, -50)
        else:
            self.SplitHorizontally(self.panelOutput, self.panelPrompt, -45)
            self.Unsplit()
        self.SetMinimumPaneSize(self.btnCmdClear.GetSize()[1] + 25)
        
        self.SetSashGravity(1.0)
        
        # layout
        self.SetAutoLayout(True)
        self.Layout()

    def MakeSearchPaneContent(self, pane, modulesData):
        """!Create search pane"""
        border = wx.BoxSizer(wx.VERTICAL)
        
        self.search = SearchModuleWidget(parent = pane,
                                         modulesData = modulesData)
        
        border.Add(item = self.search, proportion = 0,
                   flag = wx.EXPAND | wx.ALL, border = 1)
        
        pane.SetSizer(border)
        border.Fit(pane)
        
    def OnSearchPaneChanged(self, event):
        """!Collapse search module box"""
        if self.searchPane.IsExpanded():
            self.searchPane.SetLabel(self.infoCollapseLabelCol)
        else:
            self.searchPane.SetLabel(self.infoCollapseLabelExp)
        
        self.panelOutput.Layout()
        self.panelOutput.SendSizeEvent()
        
    def GetPanel(self, prompt = True):
        """!Get panel

        @param prompt get prompt / output panel

        @return wx.Panel reference
        """
        if prompt:
            return self.panelPrompt

        return self.panelOutput

    def WriteLog(self, text, style = None, wrap = None,
                 switchPage = False, priority = 1):
        """!Generic method for writing log message in 
        given style

        @param line text line
        @param style text style (see GStc)
        @param stdout write to stdout or stderr
        @param switchPage for backward compatibility
        (replace by priority: False=1, True=2)
        @param priority priority of this message
        (0=no priority, 1=normal, 2=medium, 3=high)
        """

        self.cmdOutput.SetStyle()

        # documenting old behavior/implementation:
        # switch notebook if required
        # now, let user to bind to the old event

        if not style:
            style = self.cmdOutput.StyleDefault
        
        # p1 = self.cmdOutput.GetCurrentPos()
        p1 = self.cmdOutput.GetEndStyled()
        # self.cmdOutput.GotoPos(p1)
        self.cmdOutput.DocumentEnd()
        
        for line in text.splitlines():
            # fill space
            if len(line) < self.lineWidth:
                diff = self.lineWidth - len(line) 
                line += diff * ' '
            
            self.cmdOutput.AddTextWrapped(line, wrap = wrap) # adds '\n'
            
            p2 = self.cmdOutput.GetCurrentPos()
            
            self.cmdOutput.StartStyling(p1, 0xff)
            self.cmdOutput.SetStyling(p2 - p1, style)
        
        self.cmdOutput.EnsureCaretVisible()
        
    def WriteCmdLog(self, line, pid = None, switchPage = True):
        """!Write message in selected style
        
        @param line message to be printed
        @param pid process pid or None
        @param switchPage True to switch page
        """
        if pid:
            line = '(' + str(pid) + ') ' + line
        self.WriteLog(line, style = self.cmdOutput.StyleCommand, switchPage = switchPage)

    def WriteWarning(self, line):
        """!Write message in warning style"""
        self.WriteLog(line, style = self.cmdOutput.StyleWarning, switchPage = True)

    def WriteError(self, line):
        """!Write message in error style"""
        self.WriteLog(line, style = self.cmdOutput.StyleError, switchPage = True)

    def OnOutputClear(self, event):
        """!Clear content of output window"""
        self.cmdOutput.SetReadOnly(False)
        self.cmdOutput.ClearAll()
        self.cmdOutput.SetReadOnly(True)
        self.progressbar.SetValue(0)

    def GetProgressBar(self):
        """!Return progress bar widget"""
        return self.progressbar

    def OnOutputSave(self, event):
        """!Save (selected) text from output window to the file"""
        text = self.cmdOutput.GetSelectedText()
        if not text:
            text = self.cmdOutput.GetText()
        
        # add newline if needed
        if len(text) > 0 and text[-1] != '\n':
            text += '\n'
        
        dlg = wx.FileDialog(self, message = _("Save file as..."),
                            defaultFile = "grass_cmd_output.txt",
                            wildcard = _("%(txt)s (*.txt)|*.txt|%(files)s (*)|*") % 
                            {'txt': _("Text files"), 'files': _("Files")},
                            style = wx.SAVE | wx.FD_OVERWRITE_PROMPT)
        
        # Show the dialog and retrieve the user response. If it is the OK response,
        # process the data.
        if dlg.ShowModal() == wx.ID_OK:
            path = dlg.GetPath()
            
            try:
                output = open(path, "w")
                output.write(text)
            except IOError, e:
                GError(_("Unable to write file '%(path)s'.\n\nDetails: %(error)s") % {'path': path, 'error': e})
            finally:
                output.close()
            message = _("Commands output saved into '%s'") % path
            wx.PostEvent(self, gShowNotification(self.GetId(), message = message))
        
        dlg.Destroy()

    def SetCopyingOfSelectedText(self, copy):
        """!Enable or disable copying of selected text in to clipboard.
        Effects prompt and output.
        
        @param copy True for enable, False for disable
        """
        if copy:
            self.cmdPrompt.Bind(stc.EVT_STC_PAINTED, self.cmdPrompt.OnTextSelectionChanged)
            self.cmdOutput.Bind(stc.EVT_STC_PAINTED, self.cmdOutput.OnTextSelectionChanged)
        else:
            self.cmdPrompt.Unbind(stc.EVT_STC_PAINTED)
            self.cmdOutput.Unbind(stc.EVT_STC_PAINTED)

    def OnCmdOutput(self, event):
        """!Print command output

        Posts event EVT_OUTPUT_TEXT with priority attribute set to 1.
        """
        message = event.text
        type  = event.type

        self.cmdOutput.AddStyledMessage(message, type)

        # documenting old behavior/implementation:
        # add elipses if not active

    def OnCmdProgress(self, event):
        """!Update progress message info"""
        self.progressbar.SetValue(event.value)
        event.Skip()

    def CmdProtocolSave(self):
        """Save commands protocol into the file"""
        if not hasattr(self, 'cmdFileProtocol'):
            return # it should not happen
        
        try:
            output = open(self.cmdFileProtocol, "w")
            cmds = self.cmdPrompt.GetCommands()
            output.write('\n'.join(cmds))
            if len(cmds) > 0:
                output.write('\n')
        except IOError, e:
            GError(_("Unable to write file '%(filePath)s'.\n\nDetails: %(error)s") % 
                    {'filePath': self.cmdFileProtocol, 'error': e})
        finally:
            output.close()
        
        message = _("Commands protocol saved into '%s'") % self.cmdFileProtocol
        wx.PostEvent(self, gShowNotification(self.GetId(), message = message))
        del self.cmdFileProtocol
        
    def OnCmdProtocol(self, event = None):
        """!Save commands into file"""
        if not event.IsChecked():
            # stop capturing commands, save list of commands to the
            # protocol file
            self.CmdProtocolSave()
        else:
            # start capturing commands
            self.cmdPrompt.ClearCommands()
            # ask for the file
            dlg = wx.FileDialog(self, message = _("Save file as..."),
                                defaultFile = "grass_cmd_protocol.txt",
                                wildcard = _("%(txt)s (*.txt)|*.txt|%(files)s (*)|*") % 
                                            {'txt': _("Text files"), 'files': _("Files")},
                                style = wx.SAVE | wx.FD_OVERWRITE_PROMPT)
            if dlg.ShowModal() == wx.ID_OK:
                self.cmdFileProtocol = dlg.GetPath()
            else:
                wx.CallAfter(self.btnCmdProtocol.SetValue, False)
            
            dlg.Destroy()
            
        event.Skip()

    def OnCmdRun(self, event):
        """!Run command"""
        self.btnCmdAbort.Enable()

        event.Skip()

    def OnCmdDone(self, event):
        """!Command done (or aborted)
        """
        self.btnCmdAbort.Enable(False)

        self.progressbar.SetValue(0) # reset progress bar on '0%'
        event.Skip()

    def OnStcChanged(self, event):
        newEvent = gGcContentChanged()
        wx.PostEvent(self, newEvent)

    def ResetFocus(self):
        """!Reset focus"""
        self.cmdPrompt.SetFocus()
        
    def GetPrompt(self):
        """!Get prompt"""
        return self.cmdPrompt


class GStc(stc.StyledTextCtrl):
    """!Styled text control for GRASS stdout and stderr.

    Based on FrameOutErr.py

    Name:      FrameOutErr.py
    Purpose:   Redirecting stdout / stderr
    Author:    Jean-Michel Fauth, Switzerland
    Copyright: (c) 2005-2007 Jean-Michel Fauth
    Licence:   GPL
    """    
    def __init__(self, parent, id, margin = False, wrap = None):
        stc.StyledTextCtrl.__init__(self, parent, id)
        self.parent = parent
        self.SetUndoCollection(True)
        self.SetReadOnly(True)

        # remember position of line begining (used for '\r')
        self.linePos         = -1

        #
        # styles
        #                
        self.SetStyle()
        
        #
        # line margins
        #
        # TODO print number only from cmdlog
        self.SetMarginWidth(1, 0)
        self.SetMarginWidth(2, 0)
        if margin:
            self.SetMarginType(0, stc.STC_MARGIN_NUMBER)
            self.SetMarginWidth(0, 30)
        else:
            self.SetMarginWidth(0, 0)

        #
        # miscellaneous
        #
        self.SetViewWhiteSpace(False)
        self.SetTabWidth(4)
        self.SetUseTabs(False)
        self.UsePopUp(True)
        self.SetSelBackground(True, "#FFFF00")
        self.SetUseHorizontalScrollBar(True)

        #
        # bindings
        #
        self.Bind(wx.EVT_WINDOW_DESTROY, self.OnDestroy)
        
    def OnTextSelectionChanged(self, event):
        """!Copy selected text to clipboard and skip event.
        The same function is in TextCtrlAutoComplete class (prompt.py).
        """
        wx.CallAfter(self.Copy)
        event.Skip()
        
    def SetStyle(self):
        """!Set styles for styled text output windows with type face 
        and point size selected by user (Courier New 10 is default)"""
        
        typeface = UserSettings.Get(group = 'appearance', key = 'outputfont', subkey = 'type')   
        if typeface == "":
            typeface = "Courier New"
        
        typesize = UserSettings.Get(group = 'appearance', key = 'outputfont', subkey = 'size')
        if typesize == None or typesize <= 0:
            typesize = 10
        typesize = float(typesize)
        
        self.StyleDefault     = 0
        self.StyleDefaultSpec = "face:%s,size:%d,fore:#000000,back:#FFFFFF" % (typeface, typesize)
        self.StyleCommand     = 1
        self.StyleCommandSpec = "face:%s,size:%d,,fore:#000000,back:#bcbcbc" % (typeface, typesize)
        self.StyleOutput      = 2
        self.StyleOutputSpec  = "face:%s,size:%d,,fore:#000000,back:#FFFFFF" % (typeface, typesize)
        # fatal error
        self.StyleError       = 3
        self.StyleErrorSpec   = "face:%s,size:%d,,fore:#7F0000,back:#FFFFFF" % (typeface, typesize)
        # warning
        self.StyleWarning     = 4
        self.StyleWarningSpec = "face:%s,size:%d,,fore:#0000FF,back:#FFFFFF" % (typeface, typesize)
        # message
        self.StyleMessage     = 5
        self.StyleMessageSpec = "face:%s,size:%d,,fore:#000000,back:#FFFFFF" % (typeface, typesize)
        # unknown
        self.StyleUnknown     = 6
        self.StyleUnknownSpec = "face:%s,size:%d,,fore:#000000,back:#FFFFFF" % (typeface, typesize)
        
        # default and clear => init
        self.StyleSetSpec(stc.STC_STYLE_DEFAULT, self.StyleDefaultSpec)
        self.StyleClearAll()
        self.StyleSetSpec(self.StyleCommand, self.StyleCommandSpec)
        self.StyleSetSpec(self.StyleOutput,  self.StyleOutputSpec)
        self.StyleSetSpec(self.StyleError,   self.StyleErrorSpec)
        self.StyleSetSpec(self.StyleWarning, self.StyleWarningSpec)
        self.StyleSetSpec(self.StyleMessage, self.StyleMessageSpec)
        self.StyleSetSpec(self.StyleUnknown, self.StyleUnknownSpec)        

    def OnDestroy(self, evt):
        """!The clipboard contents can be preserved after
        the app has exited"""
        
        wx.TheClipboard.Flush()
        evt.Skip()

    def AddTextWrapped(self, txt, wrap = None):
        """!Add string to text area.

        String is wrapped and linesep is also added to the end
        of the string"""
        # allow writing to output window
        self.SetReadOnly(False)

        if wrap:
            txt = textwrap.fill(txt, wrap) + '\n'
        else:
            if txt[-1] != '\n':
                txt += '\n'

        if '\r' in txt:
            self.linePos = -1
            for seg in txt.split('\r'):
                if self.linePos > -1:
                    self.SetCurrentPos(self.linePos)
                    self.ReplaceSelection(seg)
                else:
                    self.linePos = self.GetCurrentPos()
                    self.AddText(seg)
        else:
            self.linePos = self.GetCurrentPos()
            
            try:
                self.AddText(txt)
            except UnicodeDecodeError:
                enc = UserSettings.Get(group = 'atm', key = 'encoding', subkey = 'value')
                if enc:
                    txt = unicode(txt, enc)
                elif 'GRASS_DB_ENCODING' in os.environ:
                    txt = unicode(txt, os.environ['GRASS_DB_ENCODING'])
                else:
                    txt = EncodeString(txt)
                
                self.AddText(txt)

        # reset output window to read only
        self.SetReadOnly(True)

    def AddStyledMessage(self, message, style = None):
        """!Add message to text area.

        Handles messages with progress percentages.

        @param message message to be added
        @param style style of message, allowed values: 'message', 'warning', 'error' or None
        """
        # message prefix
        if style == 'warning':
            message = 'WARNING: ' + message
        elif style == 'error':
            message = 'ERROR: ' + message
        
        p1 = self.GetEndStyled()
        self.GotoPos(p1)
        
        # is this still needed?
        if '\b' in message:
            if self.linePos < 0:
                self.linePos = p1
            last_c = ''
            for c in message:
                if c == '\b':
                    self.linePos -= 1
                else:
                    if c == '\r':
                        pos = self.GetCurLine()[1]
                        # self.SetCurrentPos(pos)
                    else:
                        self.SetCurrentPos(self.linePos)
                    self.ReplaceSelection(c)
                    self.linePos = self.GetCurrentPos()
                    if c != ' ':
                        last_c = c
            if last_c not in ('0123456789'):
                self.AddTextWrapped('\n', wrap = None)
                self.linePos = -1
        else:
            self.linePos = -1 # don't force position
            if '\n' not in message:
                self.AddTextWrapped(message, wrap = 60)
            else:
                self.AddTextWrapped(message, wrap = None)
        p2 = self.GetCurrentPos()
        
        if p2 >= p1:
            self.StartStyling(p1, 0xff)
        
            if style == 'error':
                self.SetStyling(p2 - p1, self.StyleError)
            elif style == 'warning':
                self.SetStyling(p2 - p1, self.StyleWarning)
            elif style == 'message':
                self.SetStyling(p2 - p1, self.StyleMessage)
            else: # unknown
                self.SetStyling(p2 - p1, self.StyleUnknown)
        
        self.EnsureCaretVisible()


class GConsoleFrame(wx.Frame):
    """!Standalone GConsole for testing only"""
    def __init__(self, parent, id = wx.ID_ANY, title = "GConsole Test Frame",
                 style = wx.DEFAULT_FRAME_STYLE | wx.TAB_TRAVERSAL, **kwargs):
        wx.Frame.__init__(self, parent = parent, id = id, title = title)

        panel = wx.Panel(self, id = wx.ID_ANY)
        
        self.gconsole = GConsole(guiparent=self)
        self.goutput = GConsoleWindow(parent = panel, gconsole = self.gconsole,
                                      gcstyle = GC_SEARCH | GC_PROMPT)

        mainSizer = wx.BoxSizer(wx.VERTICAL)
        mainSizer.Add(item = self.goutput, proportion = 1, flag = wx.EXPAND, border = 0)

        panel.SetSizer(mainSizer)
        mainSizer.Fit(panel)
        self.SetMinSize((550, 500))


def testGConsole():
    app = wx.PySimpleApp()
    frame = GConsoleFrame(parent = None)
    frame.Show()
    app.MainLoop()

if __name__ == '__main__':
    testGConsole()