ref: d68f4adeba6ef0db7590cf7c4e1518f4d4bdedff
dir: /sys/lib/python/idlelib/IOBinding.py/
# changes by dscherer@cmu.edu
# - IOBinding.open() replaces the current window with the opened file,
# if the current window is both unmodified and unnamed
# - IOBinding.loadfile() interprets Windows, UNIX, and Macintosh
# end-of-line conventions, instead of relying on the standard library,
# which will only understand the local convention.
import os
import types
import sys
import codecs
import tempfile
import tkFileDialog
import tkMessageBox
import re
from Tkinter import *
from SimpleDialog import SimpleDialog
from configHandler import idleConf
try:
from codecs import BOM_UTF8
except ImportError:
# only available since Python 2.3
BOM_UTF8 = '\xef\xbb\xbf'
# 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()
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:
encoding = locale.getdefaultlocale()[1]
codecs.lookup(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
encoding = locale.nl_langinfo(locale.CODESET)
if encoding is None or encoding is '':
# situation occurs on Mac OS X
encoding = 'ascii'
codecs.lookup(encoding)
except (NameError, AttributeError, LookupError):
# Try getdefaultlocale well: it parses environment variables,
# which may give a clue. Unfortunately, getdefaultlocale has
# bugs that can cause ValueError.
try:
encoding = locale.getdefaultlocale()[1]
if encoding is None or encoding is '':
# situation occurs on Mac OS X
encoding = 'ascii'
codecs.lookup(encoding)
except (ValueError, LookupError):
pass
encoding = encoding.lower()
coding_re = re.compile("coding[:=]\s*([-\w_.]+)")
class EncodingMessage(SimpleDialog):
"Inform user that an encoding declaration is needed."
def __init__(self, master, enc):
self.should_edit = False
self.root = top = Toplevel(master)
top.bind("<Return>", self.return_event)
top.bind("<Escape>", self.do_ok)
top.protocol("WM_DELETE_WINDOW", self.wm_delete_window)
top.wm_title("I/O Warning")
top.wm_iconname("I/O Warning")
self.top = top
l1 = Label(top,
text="Non-ASCII found, yet no encoding declared. Add a line like")
l1.pack(side=TOP, anchor=W)
l2 = Entry(top, font="courier")
l2.insert(0, "# -*- coding: %s -*-" % enc)
# For some reason, the text is not selectable anymore if the
# widget is disabled.
# l2['state'] = DISABLED
l2.pack(side=TOP, anchor = W, fill=X)
l3 = Label(top, text="to your file\n"
"Choose OK to save this file as %s\n"
"Edit your general options to silence this warning" % enc)
l3.pack(side=TOP, anchor = W)
buttons = Frame(top)
buttons.pack(side=TOP, fill=X)
# Both return and cancel mean the same thing: do nothing
self.default = self.cancel = 0
b1 = Button(buttons, text="Ok", default="active",
command=self.do_ok)
b1.pack(side=LEFT, fill=BOTH, expand=1)
b2 = Button(buttons, text="Edit my file",
command=self.do_edit)
b2.pack(side=LEFT, fill=BOTH, expand=1)
self._set_transient(master)
def do_ok(self):
self.done(0)
def do_edit(self):
self.done(1)
def coding_spec(str):
"""Return the encoding declaration according to PEP 263.
Raise LookupError if the encoding is declared but unknown.
"""
# Only consider the first two lines
str = str.split("\n")[:2]
str = "\n".join(str)
match = coding_re.search(str)
if not match:
return None
name = match.group(1)
# Check whether the encoding is known
import codecs
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):
if self.editwin.flist:
if not editFile:
filename = self.askopenfile()
else:
filename=editFile
if filename:
# If the current window has no filename and hasn't been
# modified, we replace its contents (no loss). Otherwise
# we open a new window. But we won't replace the
# shell window (which has an interp(reter) attribute), which
# gets set to "not modified" at every new prompt.
try:
interp = self.editwin.interp
except:
interp = None
if not self.filename and self.get_saved() and not interp:
self.editwin.flist.open(filename, self.loadfile)
else:
self.editwin.flist.open(filename)
else:
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.
f = open(filename,'rb')
chars = f.read()
f.close()
except IOError, msg:
tkMessageBox.showerror("I/O Error", str(msg), master=self.text)
return False
chars = self.decode(chars)
# We now convert all end-of-lines to '\n's
firsteol = self.eol_re.search(chars)
if firsteol:
self.eol_convention = firsteol.group(0)
if isinstance(self.eol_convention, unicode):
# Make sure it is an ASCII string
self.eol_convention = self.eol_convention.encode("ascii")
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)
self.text.mark_set("insert", "1.0")
self.text.see("insert")
self.updaterecentfileslist(filename)
return True
def decode(self, chars):
"""Create a Unicode string
If that fails, let Tcl try its best
"""
# Check presence of a UTF-8 signature first
if chars.startswith(BOM_UTF8):
try:
chars = chars[3:].decode("utf-8")
except UnicodeError:
# has UTF-8 signature, but fails to decode...
return chars
else:
# Indicates that this file originally had a BOM
self.fileencoding = BOM_UTF8
return chars
# Next look for coding specification
try:
enc = coding_spec(chars)
except LookupError, 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,
master = self.text)
enc = None
if enc:
try:
return unicode(chars, enc)
except UnicodeError:
pass
# If it is ASCII, we need not to record anything
try:
return unicode(chars, 'ascii')
except UnicodeError:
pass
# Finally, try the locale's encoding. This is deprecated;
# the user should declare a non-ASCII encoding
try:
chars = unicode(chars, encoding)
self.fileencoding = encoding
except UnicodeError:
pass
return chars
def maybesave(self):
if self.get_saved():
return "yes"
message = "Do you want to save %s before closing?" % (
self.filename or "this untitled document")
m = tkMessageBox.Message(
title="Save On Close",
message=message,
icon=tkMessageBox.QUESTION,
type=tkMessageBox.YESNOCANCEL,
master=self.text)
reply = m.show()
if reply == "yes":
self.save(None)
if not self.get_saved():
reply = "cancel"
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(1)
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()
chars = self.encode(self.text.get("1.0", "end-1c"))
if self.eol_convention != "\n":
chars = chars.replace("\n", self.eol_convention)
try:
f = open(filename, "wb")
f.write(chars)
f.flush()
f.close()
return True
except IOError, msg:
tkMessageBox.showerror("I/O Error", str(msg),
master=self.text)
return False
def encode(self, chars):
if isinstance(chars, types.StringType):
# This is either plain ASCII, or Tk was returning mixed-encoding
# text to us. Don't try to guess further.
return chars
# 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
# If there is an encoding declared, try this first.
try:
enc = coding_spec(chars)
failed = None
except LookupError, msg:
failed = msg
enc = None
if enc:
try:
return chars.encode(enc)
except UnicodeError:
failed = "Invalid encoding '%s'" % enc
if failed:
tkMessageBox.showerror(
"I/O Error",
"%s. Saving as UTF-8" % failed,
master = self.text)
# If there was a UTF-8 signature, use that. This should not fail
if self.fileencoding == BOM_UTF8 or failed:
return BOM_UTF8 + chars.encode("utf-8")
# Try the original file encoding next, if any
if self.fileencoding:
try:
return chars.encode(self.fileencoding)
except UnicodeError:
tkMessageBox.showerror(
"I/O Error",
"Cannot save this as '%s' anymore. Saving as UTF-8" \
% self.fileencoding,
master = self.text)
return BOM_UTF8 + chars.encode("utf-8")
# Nothing was declared, and we had not determined an encoding
# on loading. Recommend an encoding line.
config_encoding = idleConf.GetOption("main","EditorWindow",
"encoding")
if config_encoding == 'utf-8':
# User has requested that we save files as UTF-8
return BOM_UTF8 + chars.encode("utf-8")
ask_user = True
try:
chars = chars.encode(encoding)
enc = encoding
if config_encoding == 'locale':
ask_user = False
except UnicodeError:
chars = BOM_UTF8 + chars.encode("utf-8")
enc = "utf-8"
if not ask_user:
return chars
dialog = EncodingMessage(self.editwin.top, enc)
dialog.go()
if dialog.num == 1:
# User asked us to edit the file
encline = "# -*- coding: %s -*-\n" % enc
firstline = self.text.get("1.0", "2.0")
if firstline.startswith("#!"):
# Insert encoding after #! line
self.text.insert("2.0", encline)
else:
self.text.insert("1.0", encline)
return self.encode(self.text.get("1.0", "end-1c"))
return chars
def fixlastline(self):
c = self.text.get("end-2c")
if c != '\n':
self.text.insert("end-1c", "\n")
def print_window(self, event):
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:
# XXX KBK 08Jun03 Wouldn't it be better to ask the user to save?
(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=1
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=0
if printPlatform: #we can try to print for this platform
command = command % 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, master=self.text)
else: #no printing for this platform
message="Printing is not enabled for this platform: %s" % platform
tkMessageBox.showinfo("Print status", message, master=self.text)
if tempfilename:
os.unlink(tempfilename)
return "break"
opendialog = None
savedialog = None
filetypes = [
("Python and text files", "*.py *.pyw *.txt", "TEXT"),
("All text files", "*", "TEXT"),
("All files", "*"),
]
def askopenfile(self):
dir, base = self.defaultfilename("open")
if not self.opendialog:
self.opendialog = tkFileDialog.Open(master=self.text,
filetypes=self.filetypes)
filename = self.opendialog.show(initialdir=dir, initialfile=base)
if isinstance(filename, unicode):
filename = filename.encode(filesystemencoding)
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 os.error:
pwd = ""
return pwd, ""
def asksavefile(self):
dir, base = self.defaultfilename("save")
if not self.savedialog:
self.savedialog = tkFileDialog.SaveAs(master=self.text,
filetypes=self.filetypes)
filename = self.savedialog.show(initialdir=dir, initialfile=base)
if isinstance(filename, unicode):
filename = filename.encode(filesystemencoding)
return filename
def updaterecentfileslist(self,filename):
"Update recent file list on all editor windows"
self.editwin.update_recent_files_list(filename)
def test():
root = Tk()
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)
self.text.bind("<Alt-s>", self.save_as)
self.text.bind("<Alt-z>", self.save_a_copy)
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>>")
def save_as(self, event):
self.text.event_generate("<<save-window-as-file>>")
def save_a_copy(self, event):
self.text.event_generate("<<save-copy-of-window-as-file>>")
text = Text(root)
text.pack()
text.focus_set()
editwin = MyEditWin(text)
io = IOBinding(editwin)
root.mainloop()
if __name__ == "__main__":
test()