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# encoding: utf-8
"""
IO related utilities.
"""
# Copyright (c) IPython Development Team.
# Distributed under the terms of the Modified BSD License.
import atexit
import os
import sys
import tempfile
from pathlib import Path
from warnings import warn
from IPython.utils.decorators import undoc
from .capture import CapturedIO, capture_output
class Tee(object):
"""A class to duplicate an output stream to stdout/err.
This works in a manner very similar to the Unix 'tee' command.
When the object is closed or deleted, it closes the original file given to
it for duplication.
"""
# Inspired by:
# http://mail.python.org/pipermail/python-list/2007-May/442737.html
def __init__(self, file_or_name, mode="w", channel='stdout'):
"""Construct a new Tee object.
Parameters
----------
file_or_name : filename or open filehandle (writable)
File that will be duplicated
mode : optional, valid mode for open().
If a filename was give, open with this mode.
channel : str, one of ['stdout', 'stderr']
"""
if channel not in ['stdout', 'stderr']:
raise ValueError('Invalid channel spec %s' % channel)
if hasattr(file_or_name, 'write') and hasattr(file_or_name, 'seek'):
self.file = file_or_name
else:
encoding = None if "b" in mode else "utf-8"
self.file = open(file_or_name, mode, encoding=encoding)
self.channel = channel
self.ostream = getattr(sys, channel)
setattr(sys, channel, self)
self._closed = False
def close(self):
"""Close the file and restore the channel."""
self.flush()
setattr(sys, self.channel, self.ostream)
self.file.close()
self._closed = True
def write(self, data):
"""Write data to both channels."""
self.file.write(data)
self.ostream.write(data)
self.ostream.flush()
def flush(self):
"""Flush both channels."""
self.file.flush()
self.ostream.flush()
def __del__(self):
if not self._closed:
self.close()
def ask_yes_no(prompt, default=None, interrupt=None):
"""Asks a question and returns a boolean (y/n) answer.
If default is given (one of 'y','n'), it is used if the user input is
empty. If interrupt is given (one of 'y','n'), it is used if the user
presses Ctrl-C. Otherwise the question is repeated until an answer is
given.
An EOF is treated as the default answer. If there is no default, an
exception is raised to prevent infinite loops.
Valid answers are: y/yes/n/no (match is not case sensitive)."""
answers = {'y':True,'n':False,'yes':True,'no':False}
ans = None
while ans not in answers.keys():
try:
ans = input(prompt+' ').lower()
if not ans: # response was an empty string
ans = default
except KeyboardInterrupt:
if interrupt:
ans = interrupt
print("\r")
except EOFError:
if default in answers.keys():
ans = default
print()
else:
raise
return answers[ans]
def temp_pyfile(src, ext='.py'):
"""Make a temporary python file, return filename and filehandle.
Parameters
----------
src : string or list of strings (no need for ending newlines if list)
Source code to be written to the file.
ext : optional, string
Extension for the generated file.
Returns
-------
(filename, open filehandle)
It is the caller's responsibility to close the open file and unlink it.
"""
fname = tempfile.mkstemp(ext)[1]
with open(Path(fname), "w", encoding="utf-8") as f:
f.write(src)
f.flush()
return fname
@undoc
def raw_print(*args, **kw):
"""DEPRECATED: Raw print to sys.__stdout__, otherwise identical interface to print()."""
warn("IPython.utils.io.raw_print has been deprecated since IPython 7.0", DeprecationWarning, stacklevel=2)
print(*args, sep=kw.get('sep', ' '), end=kw.get('end', '\n'),
file=sys.__stdout__)
sys.__stdout__.flush()
@undoc
def raw_print_err(*args, **kw):
"""DEPRECATED: Raw print to sys.__stderr__, otherwise identical interface to print()."""
warn("IPython.utils.io.raw_print_err has been deprecated since IPython 7.0", DeprecationWarning, stacklevel=2)
print(*args, sep=kw.get('sep', ' '), end=kw.get('end', '\n'),
file=sys.__stderr__)
sys.__stderr__.flush()
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