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attempt fix for loading inputrc on mac, via code from ipython

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This commit is contained in:
adam j hartz 2016-05-31 23:12:43 -04:00
parent 196d3046a3
commit 687c188702
1 changed files with 45 additions and 11 deletions
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56
xonsh/readline_shell.py
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@ -1,5 +1,13 @@
# -*- coding: utf-8 -*-
"""The readline based xonsh shell."""
"""The readline based xonsh shell.
Portions of this code related to initializing the readline library
are included from the IPython project. The IPython project is:
* Copyright (c) 2008-2014, IPython Development Team
* Copyright (c) 2001-2007, Fernando Perez <fernando.perez@colorado.edu>
* Copyright (c) 2001, Janko Hauser <jhauser@zscout.de>
* Copyright (c) 2001, Nathaniel Gray <n8gray@caltech.edu>
"""
import os
import sys
import time
@ -14,7 +22,7 @@ from xonsh.base_shell import BaseShell
from xonsh.ansi_colors import partial_color_format, color_style_names, color_style
from xonsh.environ import partial_format_prompt, multiline_prompt
from xonsh.tools import print_exception
from xonsh.platform import HAS_PYGMENTS, ON_WINDOWS, ON_CYGWIN
from xonsh.platform import HAS_PYGMENTS, ON_WINDOWS, ON_CYGWIN, ON_DARWIN
if HAS_PYGMENTS:
from xonsh import pyghooks
@ -34,12 +42,20 @@ def setup_readline():
global RL_COMPLETION_SUPPRESS_APPEND, RL_LIB, RL_CAN_RESIZE, RL_STATE, readline
if RL_COMPLETION_SUPPRESS_APPEND is not None:
return
try:
import readline
except ImportError:
for _rlmod_name in ('gnureadline', 'readline'):
try:
readline = __import__(_rlmod_name)
sys.modules['readline'] = readline
except ImportError:
pass
else:
break
if readline is None:
print("No readline implementation available. Skipping setup.")
return
import ctypes
import ctypes.util
uses_libedit = readline.__doc__ and 'libedit' in readline.__doc__
readline.set_completer_delims(' \t\n')
# Cygwin seems to hang indefinitely when querying the readline lib
if (not ON_CYGWIN) and (not readline.__file__.endswith('.py')):
@ -67,16 +83,34 @@ def setup_readline():
# handle tab completion differences found in libedit readline compatibility
# as discussed at http://stackoverflow.com/a/7116997
if readline.__doc__ and 'libedit' in readline.__doc__:
if uses_libedit and ON_DARWIN:
readline.parse_and_bind("bind ^I rl_complete")
print('\n'.join(['', "*"*78,
"libedit detected - readline will not be well behaved, including but not limited to:",
" * crashes on tab completion",
" * incorrect history navigation",
" * corrupting long-lines",
" * failure to wrap or indent lines properly",
"",
"It is highly recommended that you install gnureadline, which is installable with:",
" pip install gnureadline",
"*"*78]))
else:
readline.parse_and_bind("tab: complete")
# try to load custom user settings
try:
readline.read_init_file()
except Exception:
# this seems to fail with libedit
print_exception('xonsh: could not load readline default init file.')
inputrc_name = os.environ.get('INPUTRC')
if inputrc_name is None:
if uses_libedit:
inputrc_name = '.editrc'
else:
inputrc_name = '.inputrc'
inputrc_name = os.path.join(os.path.expanduser('~'), inputrc_name)
if os.path.isfile(inputrc_name):
try:
readline.read_init_file(inputrc_name)
except Exception:
# this seems to fail with libedit
print_exception('xonsh: could not load readline default init file.')
def teardown_readline():