# IDLEX EXTENSION## """## Copyright(C) 2011-2012 The Board of Trustees of the University of Illinois.## All rights reserved.#### Developed by: Roger D. Serwy## University of Illinois#### Permission is hereby granted, free of charge, to any person obtaining## a copy of this software and associated documentation files (the## "Software"), to deal with the Software without restriction, including## without limitation the rights to use, copy, modify, merge, publish,## distribute, sublicense, and/or sell copies of the Software, and to## permit persons to whom the Software is furnished to do so, subject to## the following conditions:#### + Redistributions of source code must retain the above copyright## notice, this list of conditions and the following disclaimers.## + Redistributions in binary form must reproduce the above copyright## notice, this list of conditions and the following disclaimers in the## documentation and/or other materials provided with the distribution.## + Neither the names of Roger D. Serwy, the University of Illinois, nor## the names of its contributors may be used to endorse or promote## products derived from this Software without specific prior written## permission.#### THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS## OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF## MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.## IN NO EVENT SHALL THE CONTRIBUTORS OR COPYRIGHT HOLDERS BE LIABLE FOR## ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF## CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH## THE SOFTWARE OR THE USE OR OTHER DEALINGS WITH THE SOFTWARE.########## Clear Window Extension#### About:#### It provides "Clear Shell Window" under "Options"## with ability to undo.#### Part of Issue 6143#### """config_extension_def = """
[ClearWindow]
enable=1
enable_editor=0
enable_shell=1
[ClearWindow_cfgBindings]
clear-window=<Control-Key-l>
"""jn = lambda x,y: '%i.%i' % (x,y) # join integers to text coordinates
sp = lambda x: tuple(map(int, x.split('.'))) # convert tkinter Text coordinate to a line and column tupleimport sys
import re
from idlelib.UndoDelegator import DeleteCommandansi_re = re.compile(r'\x01?\x1b\[(.*?)m\x02?')
defstrip_ansi(s):return ansi_re.sub("", s)classClearWindow:menudefs = [('options', [('Clear Shell Window', '<<clear-window>>'),]),]def__init__(self, editwin):self.editwin = editwinself.text = self.editwin.textself.text.bind("<<clear-window>>", self.clear_window)defclear_window_event(self, ev=None):self.clear_window(ev)return"break"defclear_window(self, event):per = self.editwin.pertext = per.bottomiomark_orig = text.index('iomark')line_io, col_io = sp(iomark_orig)# if cursor is at the prompt, preserve the prompt (multiline)prompt = strip_ansi(sys.ps1)backlines = prompt.count('\n')prompt_start = jn(line_io-backlines, 0)maybe_prompt = text.get(prompt_start, prompt_start + '+%ic' % len(prompt))at_prompt = maybe_prompt == promptif at_prompt:endpos = text.index(prompt_start)else:endpos = text.index('iomark linestart')dump = text.dump('1.0', endpos, all=True)# Add a command to the undo delegatorundo = self.editwin.undoif undo:dc = ClearWindowDeleteCommand('1.0', endpos, dump)undo.addcmd(dc)text.edit_reset() # clear out Tkinter's undo historyclassClearWindowDeleteCommand(DeleteCommand):def__init__(self, index1, index2, dump):DeleteCommand.__init__(self, index1, index2)self.dump = dumpdefdo(self, text):text.delete(self.index1, self.index2)text.see('insert')defredo(self, text):text.delete(self.index1, self.index2)text.see('insert')defundo(self, text):# inspired by "Serializing a text widget" at http://wiki.tcl.tk/9167dump = self.dumptag = {} # remember the index where a tag was activatedfor key, value, index in dump:if key == 'text':text.insert(index, value, '')elif key == 'tagon':tag[value] = indexelif key == 'tagoff':text.tag_add(value, tag[value], index)del tag[value]# extend existing tags to the end positionfor value in tag:text.tag_add(value, tag[value], self.index2)text.see('insert')
