one instance per editor window so methods know which to save close open returns focus to self editwin if aborted editorwindow openmodule others belong here undo command bindings break cycles save in case parent window is closed ie during askopenfile 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 code for use outside idle wait for the editor window to appear if the file does not contain line separators it is none if the file contains mixed line separators it is a tuple we need to save the conversion results first before being able to execute the code return text with os eols add prompts if shell else final n if missing this is either plain ascii or tk was returning mixedencoding text to us don t try to guess further preserve a bom that might have been present on opening see whether there is anything nonascii in it if not no need to figure out the encoding check if there is an encoding declared fallback save as utf8 with bom ignoring the incorrect declared encoding shell undo is reset after every prompt looks saved probably isn t things can get ugly on nt if there is no printer available one instance per editor window so methods know which to save close open returns focus to self editwin if aborted editorwindow open_module others belong here undo command bindings break cycles save in case parent window is closed ie during askopenfile 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 code for use outside idle default wait for the editor window to appear if the file does not contain line separators it is none if the file contains mixed line separators it is a tuple default we need to save the conversion results first before being able to execute the code may be a pyshell return text with os eols add prompts if shell else final n if missing saving shell changes end 1c value this is either plain ascii or tk was returning mixed encoding text to us don t try to guess further preserve a bom that might have been present on opening see whether there is anything non ascii in it if not no need to figure out the encoding check if there is an encoding declared fallback save as utf 8 with bom ignoring the incorrect declared encoding shell undo is reset after every prompt looks saved probably isn t posix platform win32 platform no printing for this platform we can try to print for this platform things can get ugly on nt if there is no printer available no printing for this platform htest
import io
import os
import shlex
import sys
import tempfile
import tokenize

from tkinter import filedialog
from tkinter import messagebox
from tkinter.simpledialog import askstring

from idlelib.config import idleConf
from idlelib.util import py_extensions

py_extensions = ' '.join("*"+ext for ext in py_extensions)
encoding = 'utf-8'
errors = 'surrogatepass' if sys.platform == 'win32' else 'surrogateescape'


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 = 'utf-8'
        self.__id_print = self.text.bind("<<print-window>>", self.print_window)

    def close(self):
        
        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)
        
        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
        
        if flist:
            if not editFile:
                filename = self.askopenfile()
            else:
                filename=editFile
            if filename:
                
                
                
                
                
                
                
                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"

        
        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_convention = os.linesep  

    def loadfile(self, filename):
        try:
            try:
                with tokenize.open(filename) as f:
                    chars = f.read()
                    fileencoding = f.encoding
                    eol_convention = f.newlines
                    converted = False
            except (UnicodeDecodeError, SyntaxError):
                
                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='utf-8',
                    parent=self.editwin.text)
                with open(filename, encoding=enc) as f:
                    chars = f.read()
                    fileencoding = f.encoding
                    eol_convention = f.newlines
                    converted = True
        except OSError as err:
            messagebox.showerror("I/O Error", str(err), parent=self.text)
            return False
        except UnicodeDecodeError:
            messagebox.showerror("Decoding Error",
                                   "File %s\nFailed to Decode" % filename,
                                   parent=self.text)
            return False

        if not isinstance(eol_convention, str):
            
            
            if eol_convention is not None:
                messagebox.showwarning("Mixed Newlines",
                                         "Mixed newlines detected.\n"
                                         "The file will be changed on save.",
                                         parent=self.text)
                converted = True
            eol_convention = os.linesep  

        self.text.delete("1.0", "end")
        self.set_filename(None)
        self.fileencoding = fileencoding
        self.eol_convention = eol_convention
        self.text.insert("1.0", chars)
        self.reset_undo()
        self.set_filename(filename)
        if converted:
            
            
            self.set_saved(False)
        self.text.mark_set("insert", "1.0")
        self.text.yview("insert")
        self.updaterecentfileslist(filename)
        return True

    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 = messagebox.askyesnocancel(
                  title="Save On Close",
                  message=message,
                  default=messagebox.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:  
                    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):
        text = self.fixnewlines()
        chars = self.encode(text)
        try:
            with open(filename, "wb") as f:
                f.write(chars)
                f.flush()
                os.fsync(f.fileno())
            return True
        except OSError as msg:
            messagebox.showerror("I/O Error", str(msg),
                                   parent=self.text)
            return False

    def fixnewlines(self):
        

        if hasattr(self.editwin, "interp"):  
            text = self.editwin.get_prompt_text('1.0', self.text.index('end-1c'))
        else:
            if self.text.get("end-2c") != '\n':
                self.text.insert("end-1c", "\n")  
            text = self.text.get('1.0', "end-1c")
        if self.eol_convention != "\n":
            text = text.replace("\n", self.eol_convention)
        return text

    def encode(self, chars):
        if isinstance(chars, bytes):
            
            
            return chars
        
        if self.fileencoding == 'utf-8-sig':
            return chars.encode('utf-8-sig')
        
        
        try:
            return chars.encode('ascii')
        except UnicodeEncodeError:
            pass
        
        try:
            encoded = chars.encode('ascii', 'replace')
            enc, _ = tokenize.detect_encoding(io.BytesIO(encoded).readline)
            return chars.encode(enc)
        except SyntaxError as err:
            failed = str(err)
        except UnicodeEncodeError:
            failed = "Invalid encoding '%s'" % enc
        messagebox.showerror(
            "I/O Error",
            "%s.\nSaving as UTF-8" % failed,
            parent=self.text)
        
        
        return chars.encode('utf-8-sig')

    def print_window(self, event):
        confirm = messagebox.askokcancel(
                  title="Print",
                  message="Print to Default Printer",
                  default=messagebox.OK,
                  parent=self.text)
        if not confirm:
            self.text.focus_set()
            return "break"
        tempfilename = None
        saved = self.get_saved()
        if saved:
            filename = self.filename
        
        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': 
            command = idleConf.GetOption('main','General',
                                         'print-command-posix')
            command = command + " 2>&1"
        elif platform == 'nt': 
            command = idleConf.GetOption('main','General','print-command-win')
        else: 
            printPlatform = False
        if printPlatform:  
            command = command % shlex.quote(filename)
            pipe = os.popen(command, "r")
            
            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
                messagebox.showerror("Print status", output, parent=self.text)
        else:  
            message = "Printing is not enabled for this platform: %s" % platform
            messagebox.showinfo("Print status", message, parent=self.text)
        if tempfilename:
            os.unlink(tempfilename)
        return "break"

    opendialog = None
    savedialog = None

    filetypes = (
        ("Python files", py_extensions, "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 = filedialog.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 = filedialog.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):  
    from tkinter import Toplevel, Text

    top = Toplevel(parent)
    top.title("Test IOBinding")
    x, y = map(int, parent.geometry().split('+')[1:])
    top.geometry("+%d+%d" % (x, y + 175))

    class MyEditWin:
        def __init__(self, text):
            self.text = text
            self.flist = None
            self.text.bind("<Control-o>", self.open)
            self.text.bind('<Control-p>', self.print)
            self.text.bind("<Control-s>", self.save)
            self.text.bind("<Alt-s>", self.saveas)
            self.text.bind('<Control-c>', self.savecopy)
        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 print(self, event):
            self.text.event_generate("<<print-window>>")
        def save(self, event):
            self.text.event_generate("<<save-window>>")
        def saveas(self, event):
            self.text.event_generate("<<save-window-as-file>>")
        def savecopy(self, event):
            self.text.event_generate("<<save-copy-of-window-as-file>>")

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

if __name__ == "__main__":
    from unittest import main
    main('idlelib.idle_test.test_iomenu', verbosity=2, exit=False)

    from idlelib.idle_test.htest import run
    run(_io_binding)