|
|
# encoding: utf-8
|
|
|
"""
|
|
|
IO related utilities.
|
|
|
"""
|
|
|
|
|
|
#-----------------------------------------------------------------------------
|
|
|
# Copyright (C) 2008-2009 The IPython Development Team
|
|
|
#
|
|
|
# Distributed under the terms of the BSD License. The full license is in
|
|
|
# the file COPYING, distributed as part of this software.
|
|
|
#-----------------------------------------------------------------------------
|
|
|
from __future__ import print_function
|
|
|
|
|
|
#-----------------------------------------------------------------------------
|
|
|
# Imports
|
|
|
#-----------------------------------------------------------------------------
|
|
|
import sys
|
|
|
import tempfile
|
|
|
|
|
|
#-----------------------------------------------------------------------------
|
|
|
# Code
|
|
|
#-----------------------------------------------------------------------------
|
|
|
|
|
|
|
|
|
class IOStream:
|
|
|
|
|
|
def __init__(self,stream, fallback=None):
|
|
|
if not hasattr(stream,'write') or not hasattr(stream,'flush'):
|
|
|
if fallback is not None:
|
|
|
stream = fallback
|
|
|
else:
|
|
|
raise ValueError("fallback required, but not specified")
|
|
|
self.stream = stream
|
|
|
self._swrite = stream.write
|
|
|
|
|
|
# clone all methods not overridden:
|
|
|
def clone(meth):
|
|
|
return not hasattr(self, meth) and not meth.startswith('_')
|
|
|
for meth in filter(clone, dir(stream)):
|
|
|
setattr(self, meth, getattr(stream, meth))
|
|
|
|
|
|
def write(self,data):
|
|
|
try:
|
|
|
self._swrite(data)
|
|
|
except:
|
|
|
try:
|
|
|
# print handles some unicode issues which may trip a plain
|
|
|
# write() call. Emulate write() by using an empty end
|
|
|
# argument.
|
|
|
print(data, end='', file=self.stream)
|
|
|
except:
|
|
|
# if we get here, something is seriously broken.
|
|
|
print('ERROR - failed to write data to stream:', self.stream,
|
|
|
file=sys.stderr)
|
|
|
|
|
|
def writelines(self, lines):
|
|
|
if isinstance(lines, basestring):
|
|
|
lines = [lines]
|
|
|
for line in lines:
|
|
|
self.write(line)
|
|
|
|
|
|
# This class used to have a writeln method, but regular files and streams
|
|
|
# in Python don't have this method. We need to keep this completely
|
|
|
# compatible so we removed it.
|
|
|
|
|
|
@property
|
|
|
def closed(self):
|
|
|
return self.stream.closed
|
|
|
|
|
|
def close(self):
|
|
|
pass
|
|
|
|
|
|
|
|
|
class IOTerm:
|
|
|
""" Term holds the file or file-like objects for handling I/O operations.
|
|
|
|
|
|
These are normally just sys.stdin, sys.stdout and sys.stderr but for
|
|
|
Windows they can can replaced to allow editing the strings before they are
|
|
|
displayed."""
|
|
|
|
|
|
# In the future, having IPython channel all its I/O operations through
|
|
|
# this class will make it easier to embed it into other environments which
|
|
|
# are not a normal terminal (such as a GUI-based shell)
|
|
|
def __init__(self, stdin=None, stdout=None, stderr=None):
|
|
|
self.stdin = IOStream(stdin, sys.stdin)
|
|
|
self.stdout = IOStream(stdout, sys.stdout)
|
|
|
self.stderr = IOStream(stderr, sys.stderr)
|
|
|
|
|
|
# setup stdin/stdout/stderr to sys.stdin/sys.stdout/sys.stderr
|
|
|
stdin = IOStream(sys.stdin)
|
|
|
stdout = IOStream(sys.stdout)
|
|
|
stderr = IOStream(sys.stderr)
|
|
|
|
|
|
|
|
|
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=None, 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, 'write') and hasattr(file, 'seek'):
|
|
|
self.file = file_or_name
|
|
|
else:
|
|
|
self.file = open(file_or_name, mode)
|
|
|
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 file_read(filename):
|
|
|
"""Read a file and close it. Returns the file source."""
|
|
|
fobj = open(filename,'r');
|
|
|
source = fobj.read();
|
|
|
fobj.close()
|
|
|
return source
|
|
|
|
|
|
|
|
|
def file_readlines(filename):
|
|
|
"""Read a file and close it. Returns the file source using readlines()."""
|
|
|
fobj = open(filename,'r');
|
|
|
lines = fobj.readlines();
|
|
|
fobj.close()
|
|
|
return lines
|
|
|
|
|
|
|
|
|
def raw_input_multi(header='', ps1='==> ', ps2='..> ',terminate_str = '.'):
|
|
|
"""Take multiple lines of input.
|
|
|
|
|
|
A list with each line of input as a separate element is returned when a
|
|
|
termination string is entered (defaults to a single '.'). Input can also
|
|
|
terminate via EOF (^D in Unix, ^Z-RET in Windows).
|
|
|
|
|
|
Lines of input which end in \\ are joined into single entries (and a
|
|
|
secondary continuation prompt is issued as long as the user terminates
|
|
|
lines with \\). This allows entering very long strings which are still
|
|
|
meant to be treated as single entities.
|
|
|
"""
|
|
|
|
|
|
try:
|
|
|
if header:
|
|
|
header += '\n'
|
|
|
lines = [raw_input(header + ps1)]
|
|
|
except EOFError:
|
|
|
return []
|
|
|
terminate = [terminate_str]
|
|
|
try:
|
|
|
while lines[-1:] != terminate:
|
|
|
new_line = raw_input(ps1)
|
|
|
while new_line.endswith('\\'):
|
|
|
new_line = new_line[:-1] + raw_input(ps2)
|
|
|
lines.append(new_line)
|
|
|
|
|
|
return lines[:-1] # don't return the termination command
|
|
|
except EOFError:
|
|
|
print
|
|
|
return lines
|
|
|
|
|
|
|
|
|
def raw_input_ext(prompt='', ps2='... '):
|
|
|
"""Similar to raw_input(), but accepts extended lines if input ends with \\."""
|
|
|
|
|
|
line = raw_input(prompt)
|
|
|
while line.endswith('\\'):
|
|
|
line = line[:-1] + raw_input(ps2)
|
|
|
return line
|
|
|
|
|
|
|
|
|
def ask_yes_no(prompt,default=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. 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 = raw_input(prompt+' ').lower()
|
|
|
if not ans: # response was an empty string
|
|
|
ans = default
|
|
|
except KeyboardInterrupt:
|
|
|
pass
|
|
|
except EOFError:
|
|
|
if default in answers.keys():
|
|
|
ans = default
|
|
|
print
|
|
|
else:
|
|
|
raise
|
|
|
|
|
|
return answers[ans]
|
|
|
|
|
|
|
|
|
class NLprinter:
|
|
|
"""Print an arbitrarily nested list, indicating index numbers.
|
|
|
|
|
|
An instance of this class called nlprint is available and callable as a
|
|
|
function.
|
|
|
|
|
|
nlprint(list,indent=' ',sep=': ') -> prints indenting each level by 'indent'
|
|
|
and using 'sep' to separate the index from the value. """
|
|
|
|
|
|
def __init__(self):
|
|
|
self.depth = 0
|
|
|
|
|
|
def __call__(self,lst,pos='',**kw):
|
|
|
"""Prints the nested list numbering levels."""
|
|
|
kw.setdefault('indent',' ')
|
|
|
kw.setdefault('sep',': ')
|
|
|
kw.setdefault('start',0)
|
|
|
kw.setdefault('stop',len(lst))
|
|
|
# we need to remove start and stop from kw so they don't propagate
|
|
|
# into a recursive call for a nested list.
|
|
|
start = kw['start']; del kw['start']
|
|
|
stop = kw['stop']; del kw['stop']
|
|
|
if self.depth == 0 and 'header' in kw.keys():
|
|
|
print(kw['header'])
|
|
|
|
|
|
for idx in range(start,stop):
|
|
|
elem = lst[idx]
|
|
|
newpos = pos + str(idx)
|
|
|
if type(elem)==type([]):
|
|
|
self.depth += 1
|
|
|
self.__call__(elem, newpos+",", **kw)
|
|
|
self.depth -= 1
|
|
|
else:
|
|
|
print(kw['indent']*self.depth + newpos + kw["sep"] + repr(elem))
|
|
|
|
|
|
nlprint = NLprinter()
|
|
|
|
|
|
|
|
|
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]
|
|
|
f = open(fname,'w')
|
|
|
f.write(src)
|
|
|
f.flush()
|
|
|
return fname, f
|
|
|
|
|
|
|
|
|
def raw_print(*args, **kw):
|
|
|
"""Raw print to sys.__stdout__, otherwise identical interface to print()."""
|
|
|
|
|
|
print(*args, sep=kw.get('sep', ' '), end=kw.get('end', '\n'),
|
|
|
file=sys.__stdout__)
|
|
|
sys.__stdout__.flush()
|
|
|
|
|
|
|
|
|
def raw_print_err(*args, **kw):
|
|
|
"""Raw print to sys.__stderr__, otherwise identical interface to print()."""
|
|
|
|
|
|
print(*args, sep=kw.get('sep', ' '), end=kw.get('end', '\n'),
|
|
|
file=sys.__stderr__)
|
|
|
sys.__stderr__.flush()
|
|
|
|
|
|
|
|
|
# Short aliases for quick debugging, do NOT use these in production code.
|
|
|
rprint = raw_print
|
|
|
rprinte = raw_print_err
|
|
|
|
