Geografic-Information-System/gui/wxpython/gui_modules/prompt.py

"""!
@package prompt.py

@brief wxGUI command prompt

Classes:
 - PromptListCtrl
 - TextCtrlAutoComplete
 - GPrompt
 - GPromptPopUp
 - GPromptSTC

(C) 2009 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 Martin Landa <landa.martin gmail.com>
@author Michael Barton <michael.barton@asu.edu>
"""

import os
import sys
import shlex
import copy

import wx
import wx.stc
import wx.lib.mixins.listctrl as listmix

from grass.script import core as grass

import globalvar
import menudata
import menuform
import gcmd
import utils

class PromptListCtrl(wx.ListCtrl, listmix.ListCtrlAutoWidthMixin):
    """!PopUp window used by GPromptPopUp"""
    def __init__(self, parent, id = wx.ID_ANY, pos = wx.DefaultPosition,
                 size = wx.DefaultSize, style = 0):
        wx.ListCtrl.__init__(self, parent, id, pos, size, style)
        listmix.ListCtrlAutoWidthMixin.__init__(self)
        
class TextCtrlAutoComplete(wx.ComboBox, listmix.ColumnSorterMixin):
    """!Auto complete text area used by GPromptPopUp"""
    def __init__ (self, parent, statusbar,
                  id = wx.ID_ANY, choices = [], **kwargs):
        """!Constructor works just like wx.TextCtrl except you can pass in a
        list of choices.  You can also change the choice list at any time
        by calling setChoices.
        
        Inspired by http://wiki.wxpython.org/TextCtrlAutoComplete
        """
        self.statusbar = statusbar
        
        if kwargs.has_key('style'):
            kwargs['style'] = wx.TE_PROCESS_ENTER | kwargs['style']
        else:
            kwargs['style'] = wx.TE_PROCESS_ENTER
        
        wx.ComboBox.__init__(self, parent, id, **kwargs)
        
        # some variables
        self._choices = choices
        self._hideOnNoMatch = True
        self._module = None      # currently selected module
        self._choiceType = None  # type of choice (module, params, flags, raster, vector ...)
        self._screenheight = wx.SystemSettings.GetMetric(wx.SYS_SCREEN_Y)
        self._historyItem = 0   # last item
        
        # sort variable needed by listmix
        self.itemDataMap = dict()
        
        # widgets
        try:
            self.dropdown = wx.PopupWindow(self)
        except NotImplementedError:
            self.Destroy()
            raise NotImplementedError
        
        # create the list and bind the events
        self.dropdownlistbox = PromptListCtrl(parent = self.dropdown,
                                              style = wx.LC_REPORT | wx.LC_SINGLE_SEL | \
                                                  wx.LC_SORT_ASCENDING | wx.LC_NO_HEADER,
                                              pos = wx.Point(0, 0))
        
        listmix.ColumnSorterMixin.__init__(self, 1)
        
        # set choices (list of GRASS modules)
        self._choicesCmd = globalvar.grassCmd['all']
        self._choicesMap = dict()
        for type in ('raster', 'vector'):
            self._choicesMap[type] = grass.list_strings(type = type[:4])
        # first search for GRASS module
        self.SetChoices(self._choicesCmd)
        
        self.SetMinSize(self.GetSize())
        # read history
        self.SetHistoryItems()
        
        # bindings...
        self.Bind(wx.EVT_KILL_FOCUS, self.OnControlChanged)
        self.Bind(wx.EVT_TEXT, self.OnEnteredText)
        self.Bind(wx.EVT_KEY_DOWN , self.OnKeyDown)
        ### self.Bind(wx.EVT_LEFT_DOWN, self.OnClick)

        # if need drop down on left click
        self.dropdown.Bind(wx.EVT_LISTBOX , self.OnListItemSelected, self.dropdownlistbox)
        self.dropdownlistbox.Bind(wx.EVT_LEFT_DOWN, self.OnListClick)
        self.dropdownlistbox.Bind(wx.EVT_LEFT_DCLICK, self.OnListDClick)
        self.dropdownlistbox.Bind(wx.EVT_LIST_COL_CLICK, self.OnListColClick)

        self.Bind(wx.EVT_COMBOBOX, self.OnCommandSelect)
        
    def _updateDataList(self, choices):
        """!Update data list"""
        # delete, if need, all the previous data
        if self.dropdownlistbox.GetColumnCount() != 0:
            self.dropdownlistbox.DeleteAllColumns()
            self.dropdownlistbox.DeleteAllItems()
        # and update the dict
        if choices:
            for numVal, data in enumerate(choices):
                self.itemDataMap[numVal] = data
        else:
            numVal = 0
        self.SetColumnCount(numVal)
    
    def _setListSize(self):
        """!Set list size"""
        choices = self._choices
        longest = 0
        for choice in choices:
            longest = max(len(choice), longest)
        longest += 3
        itemcount = min(len( choices ), 7) + 2
        charheight = self.dropdownlistbox.GetCharHeight()
        charwidth = self.dropdownlistbox.GetCharWidth()
        self.popupsize = wx.Size(charwidth*longest, charheight*itemcount)
        self.dropdownlistbox.SetSize(self.popupsize)
        self.dropdown.SetClientSize(self.popupsize)

    def _showDropDown(self, show = True):
        """!Either display the drop down list (show = True) or hide it
        (show = False).
        """
        if show:
            size = self.dropdown.GetSize()
            width, height = self.GetSizeTuple()
            x, y = self.ClientToScreenXY(0, height)
            if size.GetWidth() != width:
                size.SetWidth(width)
                self.dropdown.SetSize(size)
                self.dropdownlistbox.SetSize(self.dropdown.GetClientSize())
            if (y + size.GetHeight()) < self._screenheight:
                self.dropdown.SetPosition(wx.Point(x, y))
            else:
                self.dropdown.SetPosition(wx.Point(x, y - height - size.GetHeight()))
        
        self.dropdown.Show(show)
    
    def _listItemVisible(self):
        """!Moves the selected item to the top of the list ensuring it is
        always visible.
        """
        toSel = self.dropdownlistbox.GetFirstSelected()
        if toSel == -1:
            return
        self.dropdownlistbox.EnsureVisible(toSel)

    def _setModule(self, name):
        """!Set module's choices (flags, parameters)""" 
        # get module's description
        if name in self._choicesCmd and not self._module:
            try:
                self._module = menuform.GUI().ParseInterface(cmd = [name])
            except IOError:
                self._module = None
             
        # set choices (flags)
        self._choicesMap['flag'] = self._module.get_list_flags()
        for idx in range(len(self._choicesMap['flag'])):
            item = self._choicesMap['flag'][idx]
            desc = self._module.get_flag(item)['label']
            if not desc:
                desc = self._module.get_flag(item)['description']
            
            self._choicesMap['flag'][idx] = '%s (%s)' % (item, desc)
        
        # set choices (parameters)
        self._choicesMap['param'] = self._module.get_list_params()
        for idx in range(len(self._choicesMap['param'])):
            item = self._choicesMap['param'][idx]
            desc = self._module.get_param(item)['label']
            if not desc:
                desc = self._module.get_param(item)['description']
            
            self._choicesMap['param'][idx] = '%s (%s)' % (item, desc)
    
    def _setValueFromSelected(self):
         """!Sets the wx.TextCtrl value from the selected wx.ListCtrl item.
         Will do nothing if no item is selected in the wx.ListCtrl.
         """
         sel = self.dropdownlistbox.GetFirstSelected()
         if sel < 0:
             return
         
         if self._colFetch != -1:
             col = self._colFetch
         else:
             col = self._colSearch
         itemtext = self.dropdownlistbox.GetItem(sel, col).GetText()
         
         cmd = shlex.split(str(self.GetValue()))
         if len(cmd) > 0 and cmd[0] in self._choicesCmd:
             # -> append text (skip last item)
             if self._choiceType == 'param':
                 itemtext = itemtext.split(' ')[0]
                 self.SetValue(' '.join(cmd) + ' ' + itemtext + '=')
                 optType = self._module.get_param(itemtext)['prompt']
                 if optType in ('raster', 'vector'):
                     # -> raster/vector map
                     self.SetChoices(self._choicesMap[optType], optType)
             elif self._choiceType == 'flag':
                 itemtext = itemtext.split(' ')[0]
                 if len(itemtext) > 1:
                     prefix = '--'
                 else:
                     prefix = '-'
                 self.SetValue(' '.join(cmd[:-1]) + ' ' + prefix + itemtext)
             elif self._choiceType in ('raster', 'vector'):
                 self.SetValue(' '.join(cmd[:-1]) + ' ' + cmd[-1].split('=', 1)[0] + '=' + itemtext)
         else:
             # -> reset text
             self.SetValue(itemtext + ' ')
             
             # define module
             self._setModule(itemtext)
             
             # use parameters as default choices
             self._choiceType = 'param'
             self.SetChoices(self._choicesMap['param'], type = 'param')
         
         self.SetInsertionPointEnd()
         
         self._showDropDown(False)
         
    def GetListCtrl(self):
        """!Method required by listmix.ColumnSorterMixin"""
        return self.dropdownlistbox
    
    def SetHistoryItems(self):
        """!Read history file and update combobox items"""
        env = grass.gisenv()
        try:
            fileHistory = open(os.path.join(env['GISDBASE'],
                                            env['LOCATION_NAME'],
                                            env['MAPSET'],
                                            '.bash_history'), 'r')
        except IOError:
            self.SetItems([])
            return
        
        try:
            hist = []
            for line in fileHistory.readlines():
                hist.append(line.replace('\n', ''))
            
            self.SetItems(hist)
        finally:
            fileHistory.close()
            return
        
        self.SetItems([])
        
    def SetChoices(self, choices, type = 'module'):
        """!Sets the choices available in the popup wx.ListBox.
        The items will be sorted case insensitively.

        @param choices list of choices
        @param type type of choices (module, param, flag, raster, vector)
        """
        self._choices = choices
        self._choiceType = type
        
        self.dropdownlistbox.SetWindowStyleFlag(wx.LC_REPORT | wx.LC_SINGLE_SEL |
                                                wx.LC_SORT_ASCENDING | wx.LC_NO_HEADER)
        if not isinstance(choices, list):
            self._choices = [ x for x in choices ]
        if self._choiceType not in ('raster', 'vector'):
            # do not sort raster/vector maps
            utils.ListSortLower(self._choices)
        
        self._updateDataList(self._choices)
        
        self.dropdownlistbox.InsertColumn(0, "")
        for num, colVal in enumerate(self._choices):
            index = self.dropdownlistbox.InsertImageStringItem(sys.maxint, colVal, -1)
            self.dropdownlistbox.SetStringItem(index, 0, colVal)
            self.dropdownlistbox.SetItemData(index, num)
        self._setListSize()
        
        # there is only one choice for both search and fetch if setting a single column:
        self._colSearch = 0
        self._colFetch = -1

    def OnClick(self, event):
        """Left mouse button pressed"""
        sel = self.dropdownlistbox.GetFirstSelected()
        if not self.dropdown.IsShown():
            if sel > -1:
                self.dropdownlistbox.Select(sel)
            else:
                self.dropdownlistbox.Select(0)
            self._listItemVisible()
            self._showDropDown()
        else:
            self.dropdown.Hide()
        
    def OnCommandSelect(self, event):
        """!Command selected from history"""
        self._historyItem = event.GetSelection() - len(self.GetItems())
        self.SetFocus()
        
    def OnListClick(self, evt):
        """!Left mouse button pressed"""
        toSel, flag = self.dropdownlistbox.HitTest( evt.GetPosition() )
        #no values on poition, return
        if toSel == -1: return
        self.dropdownlistbox.Select(toSel)

    def OnListDClick(self, evt):
        """!Mouse button double click"""
        self._setValueFromSelected()

    def OnListColClick(self, evt):
        """!Left mouse button pressed on column"""
        col = evt.GetColumn()
        # reverse the sort
        if col == self._colSearch:
            self._ascending = not self._ascending
        self.SortListItems( evt.GetColumn(), ascending=self._ascending )
        self._colSearch = evt.GetColumn()
        evt.Skip()

    def OnListItemSelected(self, event):
        """!Item selected"""
        self._setValueFromSelected()
        event.Skip()

    def OnEnteredText(self, event):
        """!Text entered"""
        text = event.GetString()
        
        if not text:
            # control is empty; hide dropdown if shown:
            if self.dropdown.IsShown():
                self._showDropDown(False)
            event.Skip()
            return
        
        try:
            cmd = shlex.split(str(text))
        except ValueError, e:
            self.statusbar.SetStatusText(str(e))
            cmd = text.split(' ')
        pattern = str(text)
        
        if len(cmd) > 0 and cmd[0] in self._choicesCmd and not self._module:
            self._setModule(cmd[0])
        elif len(cmd) > 1 and cmd[0] in self._choicesCmd:
            if self._module:
                if len(cmd[-1].split('=', 1)) == 1:
                    # new option
                    if cmd[-1][0] == '-':
                        # -> flags
                        self.SetChoices(self._choicesMap['flag'], type = 'flag')
                        pattern = cmd[-1].lstrip('-')
                    else:
                        # -> options
                        self.SetChoices(self._choicesMap['param'], type = 'param')
                        pattern = cmd[-1]
                else:
                    # value
                    pattern = cmd[-1].split('=', 1)[1]
        else:
            # search for GRASS modules
            if self._module:
                # -> switch back to GRASS modules list
                self.SetChoices(self._choicesCmd)
                self._module = None
                self._choiceType = None
        
        self._choiceType
        self._choicesMap
        found = False
        choices = self._choices
        for numCh, choice in enumerate(choices):
            if choice.lower().startswith(pattern):
                found = True
            if found:
                self._showDropDown(True)
                item = self.dropdownlistbox.GetItem(numCh)
                toSel = item.GetId()
                self.dropdownlistbox.Select(toSel)
                break
        
        if not found:
            self.dropdownlistbox.Select(self.dropdownlistbox.GetFirstSelected(), False)
            if self._hideOnNoMatch:
                self._showDropDown(False)
                if self._module and '=' not in cmd[-1]:
                    message = ''
                    if cmd[-1][0] == '-': # flag
                        message = _("Warning: flag <%s> not found in '%s'") % \
                            (cmd[-1][1:], self._module.name)
                    else: # option
                        message = _("Warning: option <%s> not found in '%s'") % \
                            (cmd[-1], self._module.name)
                    self.statusbar.SetStatusText(message)
        
        if self._module and len(cmd[-1]) == 2 and cmd[-1][-2] == '=':
            optType = self._module.get_param(cmd[-1][:-2])['prompt']
            if optType in ('raster', 'vector'):
                # -> raster/vector map
                self.SetChoices(self._choicesMap[optType], optType)
        
        self._listItemVisible()
        
        event.Skip()
        
    def OnKeyDown (self, event):
        """!Do some work when the user press on the keys: up and down:
        move the cursor left and right: move the search
        """
        skip = True
        sel = self.dropdownlistbox.GetFirstSelected()
        visible = self.dropdown.IsShown()
        KC = event.GetKeyCode()
        
        if KC == wx.WXK_RIGHT:
            # right -> show choices
            if sel < (self.dropdownlistbox.GetItemCount() - 1):
                self.dropdownlistbox.Select(sel + 1)
                self._listItemVisible()
            self._showDropDown()
            skip = False
        elif KC == wx.WXK_UP:
            if visible:
                if sel > 0:
                    self.dropdownlistbox.Select(sel - 1)
                    self._listItemVisible()
                self._showDropDown()
                skip = False
            else:
                self._historyItem -= 1
                try:
                    self.SetValue(self.GetItems()[self._historyItem])
                except IndexError:
                    self._historyItem += 1
        elif KC == wx.WXK_DOWN:
            if visible:
                if sel < (self.dropdownlistbox.GetItemCount() - 1):
                    self.dropdownlistbox.Select(sel + 1)
                    self._listItemVisible()
                self._showDropDown()
                skip = False
            else:
                if self._historyItem < -1:
                    self._historyItem += 1
                    self.SetValue(self.GetItems()[self._historyItem])
        
        if visible:
            if event.GetKeyCode() == wx.WXK_RETURN:
                self._setValueFromSelected()
                skip = False
            if event.GetKeyCode() == wx.WXK_ESCAPE:
                self._showDropDown(False)
                skip = False
        if skip:
            event.Skip()
        
    def OnControlChanged(self, event):
        """!Control changed"""
        if self.IsShown():
            self._showDropDown(False)
        
        event.Skip()

class GPrompt(object):
    """!Abstract class for interactive wxGUI prompt

    See subclass GPromptPopUp and GPromptSTC.
    """
    def __init__(self, parent):
        self.parent = parent                 # GMConsole
        self.panel  = self.parent.GetPanel()
        
        if self.parent.parent.GetName() != "LayerManager":
            self.standAlone = True
        else:
            self.standAlone = False
        
        # dictionary of modules (description, keywords, ...)
        if not self.standAlone:
            self.moduleDesc = parent.parent.menudata.GetModules()
            self.moduleList = self._getListOfModules()
            self.mapList = self._getListOfMaps()
        else:
            self.moduleDesc = self.moduleList = self.mapList = None
        
        # auto complete items
        self.autoCompList   = list()
        self.autoCompFilter = None
        
        # command description (menuform.grassTask)
        self.cmdDesc = None
        self.cmdbuffer = self._readHistory()
        self.cmdindex = len(self.cmdbuffer)
        
    def _readHistory(self):
        """!Get list of commands from history file"""
        hist = list()
        env = grass.gisenv()
        try:
            fileHistory = open(os.path.join(env['GISDBASE'],
                                            env['LOCATION_NAME'],
                                            env['MAPSET'],
                                            '.bash_history'), 'r')
        except IOError:
            return hist
        
        try:
            for line in fileHistory.readlines():
                hist.append(line.replace('\n', ''))
        finally:
            fileHistory.close()
        
        return hist
        
    def _getListOfModules(self):
        """!Get list of modules"""
        result = dict()
        for module in globalvar.grassCmd['all']:
            try:
                group, name = module.split('.', 1)
            except ValueError:
                continue # TODO
            
            if not result.has_key(group):
                result[group] = list()
            result[group].append(name)
        
        # sort list of names
        for group in result.keys():
            result[group].sort()
        
        return result
    
    def _getListOfMaps(self):
        """!Get list of maps"""
        result = dict()
        result['raster'] = grass.list_strings('rast')
        result['vector'] = grass.list_strings('vect')
        
        return result

    def OnRunCmd(self, event):
        """!Run command"""
        cmdString = event.GetString()
        
        if self.standAlone:
            return
        
        if cmdString[:2] == 'd.' and not self.parent.curr_page:
            self.parent.NewDisplay(show=True)
        
        cmd = shlex.split(str(cmdString))
        if len(cmd) > 1:
            self.parent.goutput.RunCmd(cmd, switchPage = True)
        else:
            self.parent.goutput.RunCmd(cmd, switchPage = False)
        
        self.OnUpdateStatusBar(None)
        
    def OnUpdateStatusBar(self, event):
        """!Update Layer Manager status bar"""
        if self.standAlone:
            return
        
        if event is None:
            self.parent.statusbar.SetStatusText("")
        else:
            self.parent.statusbar.SetStatusText(_("Type GRASS command and run by pressing ENTER"))
            event.Skip()
        
    def GetPanel(self):
        """!Get main widget panel"""
        return self.panel

    def GetInput(self):
        """!Get main prompt widget"""
        return self.input

class GPromptPopUp(GPrompt, TextCtrlAutoComplete):
    """!Interactive wxGUI prompt - popup version"""
    def __init__(self, parent):
        GPrompt.__init__(self, parent)
        
        ### todo: fix TextCtrlAutoComplete to work also on Macs
        ### reason: missing wx.PopupWindow()
        try:
            TextCtrlAutoComplete.__init__(self, parent = self.panel, id = wx.ID_ANY,
                                          value = "",
                                          style = wx.TE_LINEWRAP | wx.TE_PROCESS_ENTER,
                                          statusbar = self.parent.parent.statusbar)
        except NotImplementedError:
            # wx.PopupWindow may be not available in wxMac
            # see http://trac.wxwidgets.org/ticket/9377
            wx.TextCtrl.__init__(parent = self.panel, id = wx.ID_ANY,
                                 value = "",
                                 style=wx.TE_LINEWRAP | wx.TE_PROCESS_ENTER,
                                 size = (-1, 25))
            self.searchBy.Enable(False)
            self.search.Enable(False)
        
        self.SetFont(wx.Font(10, wx.FONTFAMILY_MODERN, wx.NORMAL, wx.NORMAL, 0, ''))
        
        wx.CallAfter(self.SetInsertionPoint, 0)
        
        # bidnings
        self.Bind(wx.EVT_TEXT_ENTER, self.OnRunCmd)
        self.Bind(wx.EVT_TEXT,       self.OnUpdateStatusBar)
        
    def __checkKey(self, text, keywords):
        """!Check if text is in keywords (unused)"""
        found = 0
        keys = text.split(',')
        if len(keys) > 1: # -> multiple keys
            for k in keys[:-1]:
                k = k.strip()
                for key in keywords: 
                    if k == key: # full match
                        found += 1
                        break
            k = keys[-1].strip()
            for key in keywords:
                if k in key: # partial match
                    found +=1
                    break
        else:
            for key in keywords:
                if text in key: # partial match
                    found +=1
                    break
        
        if found == len(keys):
            return True
        
        return False
    
    def OnCmdErase(self, event):
        """!Erase command prompt"""
        self.input.SetValue('')

class GPromptSTC(GPrompt, wx.stc.StyledTextCtrl):
    """!Styled wxGUI prompt with autocomplete and calltips"""    
    def __init__(self, parent, id = wx.ID_ANY, margin = False):
        GPrompt.__init__(self, parent)
        wx.stc.StyledTextCtrl.__init__(self, self.panel, id)
        
        #
        # styles
        #                
        self.SetWrapMode(True)
        self.SetUndoCollection(True)        
        
        #
        # create command and map lists for autocompletion
        #
        self.AutoCompSetIgnoreCase(False) 
        
        #
        # line margins
        #
        # TODO print number only from cmdlog
        self.SetMarginWidth(1, 0)
        self.SetMarginWidth(2, 0)
        if margin:
            self.SetMarginType(0, wx.stc.STC_MARGIN_NUMBER)
            self.SetMarginWidth(0, 30)
        else:
            self.SetMarginWidth(0, 0)
        
        #
        # miscellaneous
        #
        self.SetViewWhiteSpace(False)
        self.SetUseTabs(False)
        self.UsePopUp(True)
        self.SetSelBackground(True, "#FFFF00")
        self.SetUseHorizontalScrollBar(True)
        
        #
        # bindings
        #
        self.Bind(wx.EVT_WINDOW_DESTROY, self.OnDestroy)
        self.Bind(wx.EVT_KEY_DOWN, self.OnKeyPressed)
        self.Bind(wx.stc.EVT_STC_AUTOCOMP_SELECTION, self.OnItemSelected)

    def SetFilter(self, items):
        """!Sets filter
        
        @param choices list of items to be filtered
        """
        self.autoCompFilter = items
        
    def OnItemSelected(self, event):
        """!Item selected from the list"""
        text = self.GetTextLeft()[:self.AutoCompPosStart()] + event.GetText() + ' '
        self.SetText(text)
        pos = len(text)
        self.SetSelectionStart(pos)
        self.SetCurrentPos(pos)
        
        cmd = text.split()[0]
        if not self.cmdDesc or cmd != self.cmdDesc.get_name():
            try:
                self.cmdDesc = menuform.GUI().ParseInterface(cmd = [cmd])
            except IOError:
                self.cmdDesc = None
        
    def OnKeyPressed(self, event):
        """!Key press capture for autocompletion, calltips, and command history

        @todo event.ControlDown() for manual autocomplete
        """
        # keycodes used: "." = 46, "=" = 61, "," = 44 
        
        if event.GetKeyCode() == 46 and not event.ShiftDown():
            # GRASS command autocomplete when '.' is pressed after 'r', 'v', 'i', 'g', 'db', or 'd'
            self.autoCompList = list()
            pos = self.GetCurrentPos()
            self.InsertText(pos, '.')
            self.CharRight()
            
            entry = self.GetTextLeft()
            if entry not in ['r.', 'v.', 'i.', 'g.', 'db.', 'd.']:
                return
            
            if self.autoCompFilter:
                self.autoCompList = self.autoCompFilter[entry[:-1]]
            else:
                self.autoCompList = self.moduleList[entry[:-1]]
            if len(self.autoCompList) > 0:
                self.AutoCompShow(lenEntered = 0, itemList = ' '.join(self.autoCompList))
            
        elif event.GetKeyCode() == wx.WXK_TAB:
            # show GRASS command calltips (to hide press 'ESC')
            
            pos = self.GetCurrentPos()
            entry = self.GetTextLeft()
            try:
                cmd = entry.split()[0].strip()
            except IndexError:
                cmd = ''
            
            if cmd not in globalvar.grassCmd['all']:
                return
            
            usage, description = self.GetCommandUsage(cmd)
                                        
            self.CallTipSetBackground("GREY")
            self.CallTipSetForeground("BLACK")
            self.CallTipShow(pos, usage + '\n\n' + description)
            
        elif (event.GetKeyCode() == wx.WXK_SPACE and event.ControlDown()) or \
                event.GetKeyCode() == 61 or event.GetKeyCode() == 44:
            # Autocompletion for map/data file name entry after '=', ',', or manually
            pos = self.GetCurrentPos()
            entry = self.GetTextLeft()
            if event.GetKeyCode() != 44:
                self.promptType = None
            
            if not self.cmdDesc:
                # No partial or complete GRASS command found
                return
            
            try:
                # find last typed option
                arg = entry.rstrip('=').rsplit(' ', 1)[1]
            except:
                arg = ''
            
            self.promptType = self.cmdDesc.get_param(arg)['prompt']
            
            if event.GetKeyCode() == 61:
                # autocompletion after '='
                # insert the '=' and move to after the '=', ready for a map name
                self.InsertText(pos, '=')
                self.CharRight()
                
            elif event.GetKeyCode() == 44:
                # autocompletion after ','
                # if comma is pressed, use the same maptype as previous for multiple map entries
                
                # insert the comma and move to after the comma ready for a map name
                self.InsertText(pos,',')
                self.CharRight()
                
                #must apply to an entry where '=[string]' has already been entered
                if '=' not in arg:
                    return

            elif event.GetKeyCode() == wx.WXK_SPACE and event.ControlDown():
                # manual autocompletion
                # map entries without arguments (as in r.info [mapname]) use ctrl-shift
                if not self.cmdDesc:
                    return
                
                try:
                    param = self.cmdDesc.get_list_params()[0]
                    self.promptType = self.cmdDesc.get_param(param)['prompt']
                except IndexError:
                    return
            
            if self.promptType and self.promptType in ('raster', 'raster3d', 'vector'):
                self.autoCompList = self.mapList[self.promptType]
                self.AutoCompShow(lenEntered = 0, itemList = ' '.join(self.autoCompList))
            
        elif event.GetKeyCode() in [wx.WXK_UP, wx.WXK_DOWN] and event.ControlDown():
            # Command history using ctrl-up and ctrl-down   
            if len(self.cmdbuffer) < 1:
                return
            
            self.DocumentEnd()
            
            # move through command history list index values
            if event.GetKeyCode() == wx.WXK_UP:
                self.cmdindex = self.cmdindex - 1
            if event.GetKeyCode() == wx.WXK_DOWN:
                self.cmdindex = self.cmdindex + 1
            if self.cmdindex < 0:
                self.cmdindex = 0
            if self.cmdindex > len(self.cmdbuffer) - 1:
                self.cmdindex = len(self.cmdbuffer) - 1
            
            try:
                txt = self.cmdbuffer[self.cmdindex]
            except:
                txt = ''
            
            # clear current line and insert command history    
            self.DelLineLeft()
            self.DelLineRight()
            pos = self.GetCurrentPos()            
            self.InsertText(pos,txt)
            self.LineEnd()
            
        elif event.GetKeyCode() == wx.WXK_RETURN and self.AutoCompActive() == False:
            # Run command on line when <return> is pressed    
            
            # find the command to run
            line = str(self.GetCurLine()[0]).strip()
            if len(line) == 0:
                return
            
            # parse command into list
            # TODO: shell commands should probably be passed as string           
            cmd = shlex.split(str(line))
            
            #send the command list to the processor 
            self.parent.RunCmd(cmd)
            
            # add command to history    
            self.cmdbuffer.append(line)
            
            # keep command history to a managable size
            if len(self.cmdbuffer) > 200:
                del self.cmdbuffer[0]
            self.cmdindex = len(self.cmdbuffer)

        elif event.GetKeyCode() == wx.WXK_SPACE:
            items = self.GetTextLeft().split()
            if len(items) == 1:
                cmd = items[0].strip()
                if not self.cmdDesc or cmd != self.cmdDesc.get_name():
                    try:
                        self.cmdDesc = menuform.GUI().ParseInterface(cmd = [cmd])
                    except IOError:
                        self.cmdDesc = None
            event.Skip()
        
        else:
            event.Skip()
        
    def GetTextLeft(self):
        """!Returns all text left of the caret"""
        pos = self.GetCurrentPos()
        self.HomeExtend()
        entry = self.GetSelectedText()
        self.SetCurrentPos(pos)
        
        return entry

    def GetCommandUsage(self, command):
        """!Returns command syntax by running command help"""
        usage = ''
        description = ''

        ret, out  = gcmd.RunCommand(command, 'help', getErrorMsg = True)
               
        if ret == 0:
            cmdhelp = out.splitlines()
            addline = False
            helplist = []
            description = ''
            for line in cmdhelp:
                if "Usage:" in line:
                    addline = True
                    continue
                elif "Flags:" in line:
                    addline = False
                    break
                elif addline == True:
                    line = line.strip()
                    helplist.append(line)

            for line in cmdhelp:
                if "Description:" in line:
                    addline = True
                    continue
                elif "Keywords:" in line:
                    addline = False
                    break
                elif addline == True:
                    description += (line + ' ')
                
            description = description.strip()

            for line in helplist:
                usage += line + '\n'

            return usage.strip(), description
        else:
            return ''   
        
    def OnDestroy(self, event):
        """!The clipboard contents can be preserved after
        the app has exited"""
        wx.TheClipboard.Flush()
        event.Skip()

    def OnCmdErase(self, event):
        """!Erase command prompt"""
        self.Home()
        self.DelLineRight()