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# -*- coding: utf-8 -*-
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""" Imports and provides the 'correct' version of readline for the platform.
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Readline is used throughout IPython as::
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import IPython.utils.rlineimpl as readline
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In addition to normal readline stuff, this module provides have_readline
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boolean and _outputfile variable used in IPython.utils.
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"""
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import sys
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import warnings
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_rlmod_names = ['gnureadline', 'readline']
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have_readline = False
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for _rlmod_name in _rlmod_names:
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try:
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# import readline as _rl
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_rl = __import__(_rlmod_name)
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# from readline import *
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globals().update({k:v for k,v in _rl.__dict__.items() if not k.startswith('_')})
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except ImportError:
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pass
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else:
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have_readline = True
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break
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if have_readline and (sys.platform == 'win32' or sys.platform == 'cli'):
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try:
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_outputfile=_rl.GetOutputFile()
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except AttributeError:
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warnings.warn("Failed GetOutputFile")
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have_readline = False
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# Test to see if libedit is being used instead of GNU readline.
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# Thanks to Boyd Waters for the original patch.
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uses_libedit = False
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if have_readline:
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# Official Python docs state that 'libedit' is in the docstring for libedit readline:
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uses_libedit = _rl.__doc__ and 'libedit' in _rl.__doc__
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# Note that many non-System Pythons also do not use proper readline,
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# but do not report libedit at all, nor are they linked dynamically against libedit.
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# known culprits of this include: EPD, Fink
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# There is not much we can do to detect this, until we find a specific failure
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# case, rather than relying on the readline module to self-identify as broken.
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if uses_libedit and sys.platform == 'darwin':
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_rl.parse_and_bind("bind ^I rl_complete")
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warnings.warn('\n'.join(['', "*"*78,
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"libedit detected - readline will not be well behaved, including but not limited to:",
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" * crashes on tab completion",
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" * incorrect history navigation",
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" * corrupting long-lines",
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" * failure to wrap or indent lines properly",
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"It is highly recommended that you install gnureadline, which is installable with:",
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" pip install gnureadline",
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"*"*78]),
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RuntimeWarning)
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# the clear_history() function was only introduced in Python 2.4 and is
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# actually optional in the readline API, so we must explicitly check for its
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# existence. Some known platforms actually don't have it. This thread:
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# http://mail.python.org/pipermail/python-dev/2003-August/037845.html
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# has the original discussion.
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if have_readline:
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try:
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_rl.clear_history
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except AttributeError:
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def clear_history(): pass
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_rl.clear_history = clear_history
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