upstream/ipython Files · IPython/utils/rlineimpl.py

Fully refactored subprocess handling on all platforms....

Fully refactored subprocess handling on all platforms. Now we have all process-related code in utils.process, which itself imports from platform-specific files as needed. On posix, we have reliable asynchronous delivery of stdout and stderr, and on win32 at least we have the basics that subprocess.py provides, since pexpect is not available. We also now support robust killing of subprocesses that may capture SIGINT: one SIGINT on our end is sent to the subprocess, but then we kill it, to prevent a rogue subprocess from hijacking the ipython console. Note that on posix, we now depend on pexpect, but we ship our own copy to users which we'll use if there's no system pexpect installed. UNC path handling for windows was implemented as a context manager called AvoidUNCPath.

Fernando Perez - - Load All Authors

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             rlineimpl.py
        
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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 sys

      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 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 this patch.

      uses_libedit = False

      if sys.platform == 'darwin' and have_readline:

          import commands

          # Boyd's patch had a 'while True' here, I'm always a little worried about

          # infinite loops with such code, so for now I'm taking a more conservative

          # approach. See https://bugs.launchpad.net/ipython/+bug/411599.

          for i in range(10):

              try:

                  (status, result) = commands.getstatusoutput( "otool -L %s | grep libedit" % _rl.__file__ )

                  break

              except IOError, (errno, strerror):

                  if errno == 4:

                      continue

                  else:

                      break

          if status == 0 and len(result) > 0:

              # we are bound to libedit - new in Leopard

              _rl.parse_and_bind("bind ^I rl_complete")

              print "Leopard libedit detected."

              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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				# -- 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 sys

				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 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 this patch.
				uses_libedit = False
				if sys.platform == 'darwin' and have_readline:
				import commands
				# Boyd's patch had a 'while True' here, I'm always a little worried about
				# infinite loops with such code, so for now I'm taking a more conservative
				# approach. See https://bugs.launchpad.net/ipython/+bug/411599.
				for i in range(10):
				try:
				(status, result) = commands.getstatusoutput( "otool -L %s \| grep libedit" % _rl.__file__ )
				break
				except IOError, (errno, strerror):
				if errno == 4:
				continue
				else:
				break

				if status == 0 and len(result) > 0:
				# we are bound to libedit - new in Leopard
				_rl.parse_and_bind("bind ^I rl_complete")
				print "Leopard libedit detected."
				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