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Merge pull request #937 from minrk/readline...
Merge pull request #937 from minrk/readline Add dirty trick for readline import on OSX to more aggressively detect the presence of libedit masquerading as true GNU readline. Also made the libedit warning extremely loud, so people don't miss it. See the original PR page for the gory details; short version: 1. remove lib-dynload from sys.path before trying to import readline the first time 2. after import, restore lib-dynload to its place in sys.path 3. if import failed without lib-dynload, try it one more time, to get the default module

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asyncfrontendbase.py
82 lines | 2.7 KiB | text/x-python | PythonLexer
"""
Base front end class for all async frontends.
"""
__docformat__ = "restructuredtext en"
# Tell nose to skip this module
__test__ = {}
#-------------------------------------------------------------------------------
# Copyright (C) 2008 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.
#-------------------------------------------------------------------------------
#-------------------------------------------------------------------------------
# Imports
#-------------------------------------------------------------------------------
# Third-party
from twisted.python.failure import Failure
from zope.interface import implements, classProvides
# From IPython
from IPython.external import guid
from IPython.frontend.frontendbase import (FrontEndBase, IFrontEnd,
IFrontEndFactory)
from IPython.kernel.core.history import FrontEndHistory
from IPython.kernel.engineservice import IEngineCore
#-----------------------------------------------------------------------------
# Classes and functions
#-----------------------------------------------------------------------------
class AsyncFrontEndBase(FrontEndBase):
"""
Overrides FrontEndBase to wrap execute in a deferred result.
All callbacks are made as callbacks on the deferred result.
"""
implements(IFrontEnd)
classProvides(IFrontEndFactory)
def __init__(self, engine=None, history=None):
assert(engine==None or IEngineCore.providedBy(engine))
self.engine = IEngineCore(engine)
if history is None:
self.history = FrontEndHistory(input_cache=[''])
else:
self.history = history
def execute(self, block, blockID=None):
"""Execute the block and return the deferred result.
Parameters:
block : {str, AST}
blockID : any
Caller may provide an ID to identify this block.
result['blockID'] := blockID
Result:
Deferred result of self.interpreter.execute
"""
if(not self.is_complete(block)):
return Failure(Exception("Block is not compilable"))
if(blockID == None):
blockID = guid.generate()
d = self.engine.execute(block)
d.addCallback(self._add_history, block=block)
d.addCallbacks(self._add_block_id_for_result,
errback=self._add_block_id_for_failure,
callbackArgs=(blockID,),
errbackArgs=(blockID,))
d.addBoth(self.update_cell_prompt, blockID=blockID)
d.addCallbacks(self.render_result,
errback=self.render_error)
return d