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# -*- coding: utf-8 -*-
""" Imports and provides the 'correct' version of readline for the platform.
Readline is used throughout IPython as::
import IPython.utils.rlineimpl as readline
In addition to normal readline stuff, this module provides have_readline
boolean and _outputfile variable used in IPython.utils.
"""
import re
import sys
import time
import warnings
from subprocess import Popen, PIPE
try:
from readline import *
import readline as _rl
have_readline = True
except ImportError:
try:
from pyreadline import *
import pyreadline as _rl
have_readline = True
except ImportError:
have_readline = False
if have_readline and hasattr(_rl, 'rlmain'):
# patch add_history to allow for strings in pyreadline <= 1.5:
# fix copied from pyreadline 1.6
import pyreadline
if pyreadline.release.version <= '1.5':
def add_history(line):
"""add a line to the history buffer."""
from pyreadline import lineobj
if not isinstance(line, lineobj.TextLine):
line = lineobj.TextLine(line)
return _rl.add_history(line)
if sys.platform == 'win32' and have_readline:
try:
_outputfile=_rl.GetOutputFile()
except AttributeError:
print "Failed GetOutputFile"
have_readline = False
# Test to see if libedit is being used instead of GNU readline.
# Thanks to Boyd Waters for the original patch.
uses_libedit = False
if sys.platform == 'darwin' and have_readline:
# Previously this used commands.getstatusoutput, which uses os.popen.
# Switching to subprocess.Popen, and exponential falloff for EINTR
# seems to make this better behaved in environments such as PyQt and gdb
dt = 1e-3
while dt < 1:
p = Popen(['otool', '-L', _rl.__file__], stdout=PIPE, stderr=PIPE)
otool,err = p.communicate()
if p.returncode == 4:
# EINTR
time.sleep(dt)
dt *= 2
continue
elif p.returncode:
warnings.warn("libedit detection failed: %s"%err)
break
else:
break
if p.returncode == 0 and re.search(r'/libedit[\.\d+]*\.dylib\s', otool):
# we are bound to libedit - new in Leopard
_rl.parse_and_bind("bind ^I rl_complete")
warnings.warn("Leopard libedit detected - readline will not be well behaved "
"including some crashes on tab completion, and incorrect history navigation. "
"It is highly recommended that you install readline, "
"which is easy_installable with: 'easy_install readline'",
RuntimeWarning)
uses_libedit = True
# the clear_history() function was only introduced in Python 2.4 and is
# actually optional in the readline API, so we must explicitly check for its
# existence. Some known platforms actually don't have it. This thread:
# http://mail.python.org/pipermail/python-dev/2003-August/037845.html
# has the original discussion.
if have_readline:
try:
_rl.clear_history
except AttributeError:
def clear_history(): pass
_rl.clear_history = clear_history
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