Mini Shell
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
import idlelib
from idlelib.config import idleConf
if idlelib.testing: # Set True by test.test_idle to avoid setlocale.
encoding = 'utf-8'
errors = 'surrogateescape'
else:
# 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
if sys.platform == 'win32':
encoding = 'utf-8'
errors = 'surrogateescape'
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:
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:
codecs.lookup(locale_encoding)
except (ValueError, LookupError):
pass
if locale_encoding:
encoding = locale_encoding.lower()
errors = 'strict'
else:
# POSIX locale or macOS
encoding = 'ascii'
errors = 'surrogateescape'
# Encoding is used in multiple files; locale_encoding nowhere.
# The only use of 'encoding' below is in _decode as initial value
# of deprecated block asking user for encoding.
# Perhaps use elsewhere should be reviewed.
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:
# 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.
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 = 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):
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:
tkMessageBox.showerror("I/O Error", str(msg),
parent=self.text)
return False
def fixnewlines(self):
"Return text with final \n if needed and os eols."
if (self.text.get("end-2c") != '\n'
and not hasattr(self.editwin, "interp")): # Not shell.
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):
# 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 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
root = Toplevel(parent)
root.title("Test IOBinding")
x, y = map(int, parent.geometry().split('+')[1:])
root.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(root)
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)
Zerion Mini Shell 1.0