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Edit File : IOBinding.py \| Size : 19.31 KB
import codecs from codecs import BOM_UTF8 import os import re import shlex import sys import tempfile import tkinter.filedialog as tkFileDialog import tkinter.messagebox as tkMessageBox from tkinter.simpledialog import askstring # Try setting the locale, so that we can find out # what encoding to use try: import locale locale.setlocale(locale.LC_CTYPE, "") except (ImportError, locale.Error): pass # Encoding for file names filesystemencoding = sys.getfilesystemencoding() ### currently unused locale_encoding = 'ascii' if sys.platform == 'win32': # On Windows, we could use "mbcs". However, to give the user # a portable encoding name, we need to find the code page try: locale_encoding = locale.getdefaultlocale()[1] codecs.lookup(locale_encoding) except LookupError: pass else: try: # Different things can fail here: the locale module may not be # loaded, it may not offer nl_langinfo, or CODESET, or the # resulting codeset may be unknown to Python. We ignore all # these problems, falling back to ASCII locale_encoding = locale.nl_langinfo(locale.CODESET) if locale_encoding is None or locale_encoding is '': # situation occurs on Mac OS X locale_encoding = 'ascii' codecs.lookup(locale_encoding) except (NameError, AttributeError, LookupError): # Try getdefaultlocale: it parses environment variables, # which may give a clue. Unfortunately, getdefaultlocale has # bugs that can cause ValueError. try: locale_encoding = locale.getdefaultlocale()[1] if locale_encoding is None or locale_encoding is '': # situation occurs on Mac OS X locale_encoding = 'ascii' codecs.lookup(locale_encoding) except (ValueError, LookupError): pass locale_encoding = locale_encoding.lower() encoding = locale_encoding ### KBK 07Sep07 This is used all over IDLE, check! ### 'encoding' is used below in encode(), check! coding_re = re.compile(r'^[ \t\f]#.coding[:=][ \t]([-\w.]+)', re.ASCII) blank_re = re.compile(r'^[ \t\f](?:[#\r\n]\|$)', re.ASCII) def coding_spec(data): """Return the encoding declaration according to PEP 263. When checking encoded data, only the first two lines should be passed in to avoid a UnicodeDecodeError if the rest of the data is not unicode. The first two lines would contain the encoding specification. Raise a LookupError if the encoding is declared but unknown. """ if isinstance(data, bytes): # This encoding might be wrong. However, the coding # spec must be ASCII-only, so any non-ASCII characters # around here will be ignored. Decoding to Latin-1 should # never fail (except for memory outage) lines = data.decode('iso-8859-1') else: lines = data # consider only the first two lines if '\n' in lines: lst = lines.split('\n', 2)[:2] elif '\r' in lines: lst = lines.split('\r', 2)[:2] else: lst = [lines] for line in lst: match = coding_re.match(line) if match is not None: break if not blank_re.match(line): return None else: return None name = match.group(1) try: codecs.lookup(name) except LookupError: # The standard encoding error does not indicate the encoding raise LookupError("Unknown encoding: "+name) return name class IOBinding: def __init__(self, editwin): self.editwin = editwin self.text = editwin.text self.__id_open = self.text.bind("<<open-window-from-file>>", self.open) self.__id_save = self.text.bind("<<save-window>>", self.save) self.__id_saveas = self.text.bind("<<save-window-as-file>>", self.save_as) self.__id_savecopy = self.text.bind("<<save-copy-of-window-as-file>>", self.save_a_copy) self.fileencoding = None self.__id_print = self.text.bind("<<print-window>>", self.print_window) def close(self): # Undo command bindings self.text.unbind("<<open-window-from-file>>", self.__id_open) self.text.unbind("<<save-window>>", self.__id_save) self.text.unbind("<<save-window-as-file>>",self.__id_saveas) self.text.unbind("<<save-copy-of-window-as-file>>", self.__id_savecopy) self.text.unbind("<<print-window>>", self.__id_print) # Break cycles self.editwin = None self.text = None self.filename_change_hook = None def get_saved(self): return self.editwin.get_saved() def set_saved(self, flag): self.editwin.set_saved(flag) def reset_undo(self): self.editwin.reset_undo() filename_change_hook = None def set_filename_change_hook(self, hook): self.filename_change_hook = hook filename = None dirname = None def set_filename(self, filename): if filename and os.path.isdir(filename): self.filename = None self.dirname = filename else: self.filename = filename self.dirname = None self.set_saved(1) if self.filename_change_hook: self.filename_change_hook() def open(self, event=None, editFile=None): flist = self.editwin.flist # Save in case parent window is closed (ie, during askopenfile()). if flist: if not editFile: filename = self.askopenfile() else: filename=editFile if filename: # If editFile is valid and already open, flist.open will # shift focus to its existing window. # If the current window exists and is a fresh unnamed, # unmodified editor window (not an interpreter shell), # pass self.loadfile to flist.open so it will load the file # in the current window (if the file is not already open) # instead of a new window. if (self.editwin and not getattr(self.editwin, 'interp', None) and not self.filename and self.get_saved()): flist.open(filename, self.loadfile) else: flist.open(filename) else: if self.text: self.text.focus_set() return "break" # Code for use outside IDLE: if self.get_saved(): reply = self.maybesave() if reply == "cancel": self.text.focus_set() return "break" if not editFile: filename = self.askopenfile() else: filename=editFile if filename: self.loadfile(filename) else: self.text.focus_set() return "break" eol = r"(\r\n)\|\n\|\r" # \r\n (Windows), \n (UNIX), or \r (Mac) eol_re = re.compile(eol) eol_convention = os.linesep # default def loadfile(self, filename): try: # open the file in binary mode so that we can handle # end-of-line convention ourselves. with open(filename, 'rb') as f: two_lines = f.readline() + f.readline() f.seek(0) bytes = f.read() except OSError as msg: tkMessageBox.showerror("I/O Error", str(msg), parent=self.text) return False chars, converted = self._decode(two_lines, bytes) if chars is None: tkMessageBox.showerror("Decoding Error", "File %s\nFailed to Decode" % filename, parent=self.text) return False # We now convert all end-of-lines to '\n's firsteol = self.eol_re.search(chars) if firsteol: self.eol_convention = firsteol.group(0) chars = self.eol_re.sub(r"\n", chars) self.text.delete("1.0", "end") self.set_filename(None) self.text.insert("1.0", chars) self.reset_undo() self.set_filename(filename) if converted: # We need to save the conversion results first # before being able to execute the code self.set_saved(False) self.text.mark_set("insert", "1.0") self.text.yview("insert") self.updaterecentfileslist(filename) return True def _decode(self, two_lines, bytes): "Create a Unicode string." chars = None # Check presence of a UTF-8 signature first if bytes.startswith(BOM_UTF8): try: chars = bytes[3:].decode("utf-8") except UnicodeDecodeError: # has UTF-8 signature, but fails to decode... return None, False else: # Indicates that this file originally had a BOM self.fileencoding = 'BOM' return chars, False # Next look for coding specification try: enc = coding_spec(two_lines) except LookupError as name: tkMessageBox.showerror( title="Error loading the file", message="The encoding '%s' is not known to this Python "\ "installation. The file may not display correctly" % name, parent = self.text) enc = None except UnicodeDecodeError: return None, False if enc: try: chars = str(bytes, enc) self.fileencoding = enc return chars, False except UnicodeDecodeError: pass # Try ascii: try: chars = str(bytes, 'ascii') self.fileencoding = None return chars, False except UnicodeDecodeError: pass # Try utf-8: try: chars = str(bytes, 'utf-8') self.fileencoding = 'utf-8' return chars, False except UnicodeDecodeError: pass # Finally, try the locale's encoding. This is deprecated; # the user should declare a non-ASCII encoding try: # Wait for the editor window to appear self.editwin.text.update() enc = askstring( "Specify file encoding", "The file's encoding is invalid for Python 3.x.\n" "IDLE will convert it to UTF-8.\n" "What is the current encoding of the file?", initialvalue = locale_encoding, parent = self.editwin.text) if enc: chars = str(bytes, enc) self.fileencoding = None return chars, True except (UnicodeDecodeError, LookupError): pass return None, False # None on failure def maybesave(self): if self.get_saved(): return "yes" message = "Do you want to save %s before closing?" % ( self.filename or "this untitled document") confirm = tkMessageBox.askyesnocancel( title="Save On Close", message=message, default=tkMessageBox.YES, parent=self.text) if confirm: reply = "yes" self.save(None) if not self.get_saved(): reply = "cancel" elif confirm is None: reply = "cancel" else: reply = "no" self.text.focus_set() return reply def save(self, event): if not self.filename: self.save_as(event) else: if self.writefile(self.filename): self.set_saved(True) try: self.editwin.store_file_breaks() except AttributeError: # may be a PyShell pass self.text.focus_set() return "break" def save_as(self, event): filename = self.asksavefile() if filename: if self.writefile(filename): self.set_filename(filename) self.set_saved(1) try: self.editwin.store_file_breaks() except AttributeError: pass self.text.focus_set() self.updaterecentfileslist(filename) return "break" def save_a_copy(self, event): filename = self.asksavefile() if filename: self.writefile(filename) self.text.focus_set() self.updaterecentfileslist(filename) return "break" def writefile(self, filename): self.fixlastline() text = self.text.get("1.0", "end-1c") if self.eol_convention != "\n": text = text.replace("\n", self.eol_convention) chars = self.encode(text) try: with open(filename, "wb") as f: f.write(chars) return True except OSError as msg: tkMessageBox.showerror("I/O Error", str(msg), parent=self.text) return False def encode(self, chars): if isinstance(chars, bytes): # This is either plain ASCII, or Tk was returning mixed-encoding # text to us. Don't try to guess further. return chars # Preserve a BOM that might have been present on opening if self.fileencoding == 'BOM': return BOM_UTF8 + chars.encode("utf-8") # See whether there is anything non-ASCII in it. # If not, no need to figure out the encoding. try: return chars.encode('ascii') except UnicodeError: pass # Check if there is an encoding declared try: # a string, let coding_spec slice it to the first two lines enc = coding_spec(chars) failed = None except LookupError as msg: failed = msg enc = None else: if not enc: # PEP 3120: default source encoding is UTF-8 enc = 'utf-8' if enc: try: return chars.encode(enc) except UnicodeError: failed = "Invalid encoding '%s'" % enc tkMessageBox.showerror( "I/O Error", "%s.\nSaving as UTF-8" % failed, parent = self.text) # Fallback: save as UTF-8, with BOM - ignoring the incorrect # declared encoding return BOM_UTF8 + chars.encode("utf-8") def fixlastline(self): c = self.text.get("end-2c") if c != '\n': self.text.insert("end-1c", "\n") def print_window(self, event): confirm = tkMessageBox.askokcancel( title="Print", message="Print to Default Printer", default=tkMessageBox.OK, parent=self.text) if not confirm: self.text.focus_set() return "break" tempfilename = None saved = self.get_saved() if saved: filename = self.filename # shell undo is reset after every prompt, looks saved, probably isn't if not saved or filename is None: (tfd, tempfilename) = tempfile.mkstemp(prefix='IDLE_tmp_') filename = tempfilename os.close(tfd) if not self.writefile(tempfilename): os.unlink(tempfilename) return "break" platform = os.name printPlatform = True if platform == 'posix': #posix platform command = idleConf.GetOption('main','General', 'print-command-posix') command = command + " 2>&1" elif platform == 'nt': #win32 platform command = idleConf.GetOption('main','General','print-command-win') else: #no printing for this platform printPlatform = False if printPlatform: #we can try to print for this platform command = command % shlex.quote(filename) pipe = os.popen(command, "r") # things can get ugly on NT if there is no printer available. output = pipe.read().strip() status = pipe.close() if status: output = "Printing failed (exit status 0x%x)\n" % \ status + output if output: output = "Printing command: %s\n" % repr(command) + output tkMessageBox.showerror("Print status", output, parent=self.text) else: #no printing for this platform message = "Printing is not enabled for this platform: %s" % platform tkMessageBox.showinfo("Print status", message, parent=self.text) if tempfilename: os.unlink(tempfilename) return "break" opendialog = None savedialog = None filetypes = [ ("Python files", ".py .pyw", "TEXT"), ("Text files", ".txt", "TEXT"), ("All files", ""), ] defaultextension = '.py' if sys.platform == 'darwin' else '' def askopenfile(self): dir, base = self.defaultfilename("open") if not self.opendialog: self.opendialog = tkFileDialog.Open(parent=self.text, filetypes=self.filetypes) filename = self.opendialog.show(initialdir=dir, initialfile=base) return filename def defaultfilename(self, mode="open"): if self.filename: return os.path.split(self.filename) elif self.dirname: return self.dirname, "" else: try: pwd = os.getcwd() except OSError: pwd = "" return pwd, "" def asksavefile(self): dir, base = self.defaultfilename("save") if not self.savedialog: self.savedialog = tkFileDialog.SaveAs( parent=self.text, filetypes=self.filetypes, defaultextension=self.defaultextension) filename = self.savedialog.show(initialdir=dir, initialfile=base) return filename def updaterecentfileslist(self,filename): "Update recent file list on all editor windows" if self.editwin.flist: self.editwin.update_recent_files_list(filename) def _io_binding(parent): # htest # from tkinter import Toplevel, Text from idlelib.configHandler import idleConf root = Toplevel(parent) root.title("Test IOBinding") width, height, x, y = list(map(int, re.split('[x+]', parent.geometry()))) root.geometry("+%d+%d"%(x, y + 150)) class MyEditWin: def __init__(self, text): self.text = text self.flist = None self.text.bind("<Control-o>", self.open) self.text.bind("<Control-s>", self.save) def get_saved(self): return 0 def set_saved(self, flag): pass def reset_undo(self): pass def open(self, event): self.text.event_generate("<<open-window-from-file>>") def save(self, event): self.text.event_generate("<<save-window>>") text = Text(root) text.pack() text.focus_set() editwin = MyEditWin(text) IOBinding(editwin) if __name__ == "__main__": from idlelib.idle_test.htest import run run(_io_binding) Back

Edit File : IOBinding.py | Size : 19.31 KB

import codecs
from codecs import BOM_UTF8
import os
import re
import shlex
import sys
import tempfile

import tkinter.filedialog as tkFileDialog
import tkinter.messagebox as tkMessageBox
from tkinter.simpledialog import askstring

# Try setting the locale, so that we can find out
# what encoding to use
try:
    import locale
    locale.setlocale(locale.LC_CTYPE, "")
except (ImportError, locale.Error):
    pass

# Encoding for file names
filesystemencoding = sys.getfilesystemencoding()  ### currently unused

locale_encoding = 'ascii'
if sys.platform == 'win32':
    # On Windows, we could use "mbcs". However, to give the user
    # a portable encoding name, we need to find the code page
    try:
        locale_encoding = locale.getdefaultlocale()[1]
        codecs.lookup(locale_encoding)
    except LookupError:
        pass
else:
    try:
        # Different things can fail here: the locale module may not be
        # loaded, it may not offer nl_langinfo, or CODESET, or the
        # resulting codeset may be unknown to Python. We ignore all
        # these problems, falling back to ASCII
        locale_encoding = locale.nl_langinfo(locale.CODESET)
        if locale_encoding is None or locale_encoding is '':
            # situation occurs on Mac OS X
            locale_encoding = 'ascii'
        codecs.lookup(locale_encoding)
    except (NameError, AttributeError, LookupError):
        # Try getdefaultlocale: it parses environment variables,
        # which may give a clue. Unfortunately, getdefaultlocale has
        # bugs that can cause ValueError.
        try:
            locale_encoding = locale.getdefaultlocale()[1]
            if locale_encoding is None or locale_encoding is '':
                # situation occurs on Mac OS X
                locale_encoding = 'ascii'
            codecs.lookup(locale_encoding)
        except (ValueError, LookupError):
            pass

locale_encoding = locale_encoding.lower()

encoding = locale_encoding  ### KBK 07Sep07  This is used all over IDLE, check!
                            ### 'encoding' is used below in encode(), check!

coding_re = re.compile(r'^[ \t\f]*#.*coding[:=][ \t]*([-\w.]+)', re.ASCII)
blank_re = re.compile(r'^[ \t\f]*(?:[#\r\n]|$)', re.ASCII)

def coding_spec(data):
    """Return the encoding declaration according to PEP 263.

When checking encoded data, only the first two lines should be passed
    in to avoid a UnicodeDecodeError if the rest of the data is not unicode.
    The first two lines would contain the encoding specification.

Raise a LookupError if the encoding is declared but unknown.
    """
    if isinstance(data, bytes):
        # This encoding might be wrong. However, the coding
        # spec must be ASCII-only, so any non-ASCII characters
        # around here will be ignored. Decoding to Latin-1 should
        # never fail (except for memory outage)
        lines = data.decode('iso-8859-1')
    else:
        lines = data
    # consider only the first two lines
    if '\n' in lines:
        lst = lines.split('\n', 2)[:2]
    elif '\r' in lines:
        lst = lines.split('\r', 2)[:2]
    else:
        lst = [lines]
    for line in lst:
        match = coding_re.match(line)
        if match is not None:
            break
        if not blank_re.match(line):
            return None
    else:
        return None
    name = match.group(1)
    try:
        codecs.lookup(name)
    except LookupError:
        # The standard encoding error does not indicate the encoding
        raise LookupError("Unknown encoding: "+name)
    return name

class IOBinding:

def __init__(self, editwin):
        self.editwin = editwin
        self.text = editwin.text
        self.__id_open = self.text.bind("<<open-window-from-file>>", self.open)
        self.__id_save = self.text.bind("<<save-window>>", self.save)
        self.__id_saveas = self.text.bind("<<save-window-as-file>>",
                                          self.save_as)
        self.__id_savecopy = self.text.bind("<<save-copy-of-window-as-file>>",
                                            self.save_a_copy)
        self.fileencoding = None
        self.__id_print = self.text.bind("<<print-window>>", self.print_window)

def close(self):
        # Undo command bindings
        self.text.unbind("<<open-window-from-file>>", self.__id_open)
        self.text.unbind("<<save-window>>", self.__id_save)
        self.text.unbind("<<save-window-as-file>>",self.__id_saveas)
        self.text.unbind("<<save-copy-of-window-as-file>>", self.__id_savecopy)
        self.text.unbind("<<print-window>>", self.__id_print)
        # Break cycles
        self.editwin = None
        self.text = None
        self.filename_change_hook = None

def get_saved(self):
        return self.editwin.get_saved()

def set_saved(self, flag):
        self.editwin.set_saved(flag)

def reset_undo(self):
        self.editwin.reset_undo()

filename_change_hook = None

def set_filename_change_hook(self, hook):
        self.filename_change_hook = hook

filename = None
    dirname = None

def set_filename(self, filename):
        if filename and os.path.isdir(filename):
            self.filename = None
            self.dirname = filename
        else:
            self.filename = filename
            self.dirname = None
            self.set_saved(1)
            if self.filename_change_hook:
                self.filename_change_hook()

def open(self, event=None, editFile=None):
        flist = self.editwin.flist
        # Save in case parent window is closed (ie, during askopenfile()).
        if flist:
            if not editFile:
                filename = self.askopenfile()
            else:
                filename=editFile
            if filename:
                # If editFile is valid and already open, flist.open will
                # shift focus to its existing window.
                # If the current window exists and is a fresh unnamed,
                # unmodified editor window (not an interpreter shell),
                # pass self.loadfile to flist.open so it will load the file
                # in the current window (if the file is not already open)
                # instead of a new window.
                if (self.editwin and
                        not getattr(self.editwin, 'interp', None) and
                        not self.filename and
                        self.get_saved()):
                    flist.open(filename, self.loadfile)
                else:
                    flist.open(filename)
            else:
                if self.text:
                    self.text.focus_set()
            return "break"

# Code for use outside IDLE:
        if self.get_saved():
            reply = self.maybesave()
            if reply == "cancel":
                self.text.focus_set()
                return "break"
        if not editFile:
            filename = self.askopenfile()
        else:
            filename=editFile
        if filename:
            self.loadfile(filename)
        else:
            self.text.focus_set()
        return "break"

eol = r"(\r\n)|\n|\r"  # \r\n (Windows), \n (UNIX), or \r (Mac)
    eol_re = re.compile(eol)
    eol_convention = os.linesep  # default

def loadfile(self, filename):
        try:
            # open the file in binary mode so that we can handle
            # end-of-line convention ourselves.
            with open(filename, 'rb') as f:
                two_lines = f.readline() + f.readline()
                f.seek(0)
                bytes = f.read()
        except OSError as msg:
            tkMessageBox.showerror("I/O Error", str(msg), parent=self.text)
            return False
        chars, converted = self._decode(two_lines, bytes)
        if chars is None:
            tkMessageBox.showerror("Decoding Error",
                                   "File %s\nFailed to Decode" % filename,
                                   parent=self.text)
            return False
        # We now convert all end-of-lines to '\n's
        firsteol = self.eol_re.search(chars)
        if firsteol:
            self.eol_convention = firsteol.group(0)
            chars = self.eol_re.sub(r"\n", chars)
        self.text.delete("1.0", "end")
        self.set_filename(None)
        self.text.insert("1.0", chars)
        self.reset_undo()
        self.set_filename(filename)
        if converted:
            # We need to save the conversion results first
            # before being able to execute the code
            self.set_saved(False)
        self.text.mark_set("insert", "1.0")
        self.text.yview("insert")
        self.updaterecentfileslist(filename)
        return True

def _decode(self, two_lines, bytes):
        "Create a Unicode string."
        chars = None
        # Check presence of a UTF-8 signature first
        if bytes.startswith(BOM_UTF8):
            try:
                chars = bytes[3:].decode("utf-8")
            except UnicodeDecodeError:
                # has UTF-8 signature, but fails to decode...
                return None, False
            else:
                # Indicates that this file originally had a BOM
                self.fileencoding = 'BOM'
                return chars, False
        # Next look for coding specification
        try:
            enc = coding_spec(two_lines)
        except LookupError as name:
            tkMessageBox.showerror(
                title="Error loading the file",
                message="The encoding '%s' is not known to this Python "\
                "installation. The file may not display correctly" % name,
                parent = self.text)
            enc = None
        except UnicodeDecodeError:
            return None, False
        if enc:
            try:
                chars = str(bytes, enc)
                self.fileencoding = enc
                return chars, False
            except UnicodeDecodeError:
                pass
        # Try ascii:
        try:
            chars = str(bytes, 'ascii')
            self.fileencoding = None
            return chars, False
        except UnicodeDecodeError:
            pass
        # Try utf-8:
        try:
            chars = str(bytes, 'utf-8')
            self.fileencoding = 'utf-8'
            return chars, False
        except UnicodeDecodeError:
            pass
        # Finally, try the locale's encoding. This is deprecated;
        # the user should declare a non-ASCII encoding
        try:
            # Wait for the editor window to appear
            self.editwin.text.update()
            enc = askstring(
                "Specify file encoding",
                "The file's encoding is invalid for Python 3.x.\n"
                "IDLE will convert it to UTF-8.\n"
                "What is the current encoding of the file?",
                initialvalue = locale_encoding,
                parent = self.editwin.text)

if enc:
                chars = str(bytes, enc)
                self.fileencoding = None
            return chars, True
        except (UnicodeDecodeError, LookupError):
            pass
        return None, False  # None on failure

def maybesave(self):
        if self.get_saved():
            return "yes"
        message = "Do you want to save %s before closing?" % (
            self.filename or "this untitled document")
        confirm = tkMessageBox.askyesnocancel(
                  title="Save On Close",
                  message=message,
                  default=tkMessageBox.YES,
                  parent=self.text)
        if confirm:
            reply = "yes"
            self.save(None)
            if not self.get_saved():
                reply = "cancel"
        elif confirm is None:
            reply = "cancel"
        else:
            reply = "no"
        self.text.focus_set()
        return reply

def save(self, event):
        if not self.filename:
            self.save_as(event)
        else:
            if self.writefile(self.filename):
                self.set_saved(True)
                try:
                    self.editwin.store_file_breaks()
                except AttributeError:  # may be a PyShell
                    pass
        self.text.focus_set()
        return "break"

def save_as(self, event):
        filename = self.asksavefile()
        if filename:
            if self.writefile(filename):
                self.set_filename(filename)
                self.set_saved(1)
                try:
                    self.editwin.store_file_breaks()
                except AttributeError:
                    pass
        self.text.focus_set()
        self.updaterecentfileslist(filename)
        return "break"

def save_a_copy(self, event):
        filename = self.asksavefile()
        if filename:
            self.writefile(filename)
        self.text.focus_set()
        self.updaterecentfileslist(filename)
        return "break"

def writefile(self, filename):
        self.fixlastline()
        text = self.text.get("1.0", "end-1c")
        if self.eol_convention != "\n":
            text = text.replace("\n", self.eol_convention)
        chars = self.encode(text)
        try:
            with open(filename, "wb") as f:
                f.write(chars)
            return True
        except OSError as msg:
            tkMessageBox.showerror("I/O Error", str(msg),
                                   parent=self.text)
            return False

def encode(self, chars):
        if isinstance(chars, bytes):
            # This is either plain ASCII, or Tk was returning mixed-encoding
            # text to us. Don't try to guess further.
            return chars
        # Preserve a BOM that might have been present on opening
        if self.fileencoding == 'BOM':
            return BOM_UTF8 + chars.encode("utf-8")
        # See whether there is anything non-ASCII in it.
        # If not, no need to figure out the encoding.
        try:
            return chars.encode('ascii')
        except UnicodeError:
            pass
        # Check if there is an encoding declared
        try:
            # a string, let coding_spec slice it to the first two lines
            enc = coding_spec(chars)
            failed = None
        except LookupError as msg:
            failed = msg
            enc = None
        else:
            if not enc:
                # PEP 3120: default source encoding is UTF-8
                enc = 'utf-8'
        if enc:
            try:
                return chars.encode(enc)
            except UnicodeError:
                failed = "Invalid encoding '%s'" % enc
        tkMessageBox.showerror(
            "I/O Error",
            "%s.\nSaving as UTF-8" % failed,
            parent = self.text)
        # Fallback: save as UTF-8, with BOM - ignoring the incorrect
        # declared encoding
        return BOM_UTF8 + chars.encode("utf-8")

def fixlastline(self):
        c = self.text.get("end-2c")
        if c != '\n':
            self.text.insert("end-1c", "\n")

def print_window(self, event):
        confirm = tkMessageBox.askokcancel(
                  title="Print",
                  message="Print to Default Printer",
                  default=tkMessageBox.OK,
                  parent=self.text)
        if not confirm:
            self.text.focus_set()
            return "break"
        tempfilename = None
        saved = self.get_saved()
        if saved:
            filename = self.filename
        # shell undo is reset after every prompt, looks saved, probably isn't
        if not saved or filename is None:
            (tfd, tempfilename) = tempfile.mkstemp(prefix='IDLE_tmp_')
            filename = tempfilename
            os.close(tfd)
            if not self.writefile(tempfilename):
                os.unlink(tempfilename)
                return "break"
        platform = os.name
        printPlatform = True
        if platform == 'posix': #posix platform
            command = idleConf.GetOption('main','General',
                                         'print-command-posix')
            command = command + " 2>&1"
        elif platform == 'nt': #win32 platform
            command = idleConf.GetOption('main','General','print-command-win')
        else: #no printing for this platform
            printPlatform = False
        if printPlatform:  #we can try to print for this platform
            command = command % shlex.quote(filename)
            pipe = os.popen(command, "r")
            # things can get ugly on NT if there is no printer available.
            output = pipe.read().strip()
            status = pipe.close()
            if status:
                output = "Printing failed (exit status 0x%x)\n" % \
                         status + output
            if output:
                output = "Printing command: %s\n" % repr(command) + output
                tkMessageBox.showerror("Print status", output, parent=self.text)
        else:  #no printing for this platform
            message = "Printing is not enabled for this platform: %s" % platform
            tkMessageBox.showinfo("Print status", message, parent=self.text)
        if tempfilename:
            os.unlink(tempfilename)
        return "break"

opendialog = None
    savedialog = None

filetypes = [
        ("Python files", "*.py *.pyw", "TEXT"),
        ("Text files", "*.txt", "TEXT"),
        ("All files", "*"),
        ]

defaultextension = '.py' if sys.platform == 'darwin' else ''

def askopenfile(self):
        dir, base = self.defaultfilename("open")
        if not self.opendialog:
            self.opendialog = tkFileDialog.Open(parent=self.text,
                                                filetypes=self.filetypes)
        filename = self.opendialog.show(initialdir=dir, initialfile=base)
        return filename

def defaultfilename(self, mode="open"):
        if self.filename:
            return os.path.split(self.filename)
        elif self.dirname:
            return self.dirname, ""
        else:
            try:
                pwd = os.getcwd()
            except OSError:
                pwd = ""
            return pwd, ""

def asksavefile(self):
        dir, base = self.defaultfilename("save")
        if not self.savedialog:
            self.savedialog = tkFileDialog.SaveAs(
                    parent=self.text,
                    filetypes=self.filetypes,
                    defaultextension=self.defaultextension)
        filename = self.savedialog.show(initialdir=dir, initialfile=base)
        return filename

def updaterecentfileslist(self,filename):
        "Update recent file list on all editor windows"
        if self.editwin.flist:
            self.editwin.update_recent_files_list(filename)

def _io_binding(parent):  # htest #
    from tkinter import Toplevel, Text
    from idlelib.configHandler import idleConf

root = Toplevel(parent)
    root.title("Test IOBinding")
    width, height, x, y = list(map(int, re.split('[x+]', parent.geometry())))
    root.geometry("+%d+%d"%(x, y + 150))
    class MyEditWin:
        def __init__(self, text):
            self.text = text
            self.flist = None
            self.text.bind("<Control-o>", self.open)
            self.text.bind("<Control-s>", self.save)
        def get_saved(self): return 0
        def set_saved(self, flag): pass
        def reset_undo(self): pass
        def open(self, event):
            self.text.event_generate("<<open-window-from-file>>")
        def save(self, event):
            self.text.event_generate("<<save-window>>")

text = Text(root)
    text.pack()
    text.focus_set()
    editwin = MyEditWin(text)
    IOBinding(editwin)

if __name__ == "__main__":
    from idlelib.idle_test.htest import run
    run(_io_binding)

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