Removed another of the tweaks, and added a note in that it is largely untested.

IPython/core/compilerop.py

@@ -1,147 +1,144 b''
 """Compiler tools with improved interactive support.
 
 Provides compilation machinery similar to codeop, but with caching support so
 we can provide interactive tracebacks.
 
 Authors
 -------
 * Robert Kern
 * Fernando Perez
 * Thomas Kluyver
 """
 
 # Note: though it might be more natural to name this module 'compiler', that
 # name is in the stdlib and name collisions with the stdlib tend to produce
 # weird problems (often with third-party tools).
 
 #-----------------------------------------------------------------------------
 #  Copyright (C) 2010-2011 The IPython Development Team.
 #
 #  Distributed under the terms of the BSD License.
 #
 #  The full license is in the file COPYING.txt, distributed with this software.
 #-----------------------------------------------------------------------------
 
 #-----------------------------------------------------------------------------
 # Imports
 #-----------------------------------------------------------------------------
 from __future__ import print_function
 
 # Stdlib imports
 import __future__
 from ast import PyCF_ONLY_AST
 import codeop
 import functools
 import hashlib
 import linecache
 import operator
 import time
 
 #-----------------------------------------------------------------------------
 # Constants
 #-----------------------------------------------------------------------------
 
 # Roughtly equal to PyCF_MASK | PyCF_MASK_OBSOLETE as defined in pythonrun.h,
 # this is used as a bitmask to extract future-related code flags.
-try:
     PyCF_MASK = functools.reduce(operator.or_,
                                  (getattr(__future__, fname).compiler_flag
                                   for fname in __future__.all_feature_names))
-except AttributeError: # IronPython __future__'s are non-standard, 2/8/2014
-    PyCF_MASK = 0
 
 #-----------------------------------------------------------------------------
 # Local utilities
 #-----------------------------------------------------------------------------
 
 def code_name(code, number=0):
     """ Compute a (probably) unique name for code for caching.
     
     This now expects code to be unicode.
     """
     hash_digest = hashlib.md5(code.encode("utf-8")).hexdigest()
     # Include the number and 12 characters of the hash in the name.  It's
     # pretty much impossible that in a single session we'll have collisions
     # even with truncated hashes, and the full one makes tracebacks too long
     return '<ipython-input-{0}-{1}>'.format(number, hash_digest[:12])
 
 #-----------------------------------------------------------------------------
 # Classes and functions
 #-----------------------------------------------------------------------------
 
 class CachingCompiler(codeop.Compile):
     """A compiler that caches code compiled from interactive statements.
     """
 
     def __init__(self):
         codeop.Compile.__init__(self)
         
         # This is ugly, but it must be done this way to allow multiple
         # simultaneous ipython instances to coexist.  Since Python itself
         # directly accesses the data structures in the linecache module, and
         # the cache therein is global, we must work with that data structure.
         # We must hold a reference to the original checkcache routine and call
         # that in our own check_cache() below, but the special IPython cache
         # must also be shared by all IPython instances.  If we were to hold
         # separate caches (one in each CachingCompiler instance), any call made
         # by Python itself to linecache.checkcache() would obliterate the
         # cached data from the other IPython instances.
         if not hasattr(linecache, '_ipython_cache'):
             linecache._ipython_cache = {}
         if not hasattr(linecache, '_checkcache_ori'):
             linecache._checkcache_ori = linecache.checkcache
         # Now, we must monkeypatch the linecache directly so that parts of the
         # stdlib that call it outside our control go through our codepath
         # (otherwise we'd lose our tracebacks).
         linecache.checkcache = check_linecache_ipython
         
     def ast_parse(self, source, filename='<unknown>', symbol='exec'):
         """Parse code to an AST with the current compiler flags active.
         
         Arguments are exactly the same as ast.parse (in the standard library),
         and are passed to the built-in compile function."""
         return compile(source, filename, symbol, self.flags | PyCF_ONLY_AST, 1)
     
     def reset_compiler_flags(self):
         """Reset compiler flags to default state."""
         # This value is copied from codeop.Compile.__init__, so if that ever
         # changes, it will need to be updated.
         self.flags = codeop.PyCF_DONT_IMPLY_DEDENT
 
     @property
     def compiler_flags(self):
         """Flags currently active in the compilation process.
         """
         return self.flags
         
     def cache(self, code, number=0):
         """Make a name for a block of code, and cache the code.
         
         Parameters
         ----------
         code : str
           The Python source code to cache.
         number : int
           A number which forms part of the code's name. Used for the execution
           counter.
           
         Returns
         -------
         The name of the cached code (as a string). Pass this as the filename
         argument to compilation, so that tracebacks are correctly hooked up.
         """
         name = code_name(code, number)
         entry = (len(code), time.time(),
                  [line+'\n' for line in code.splitlines()], name)
         linecache.cache[name] = entry
         linecache._ipython_cache[name] = entry
         return name
 
 def check_linecache_ipython(*args):
     """Call linecache.checkcache() safely protecting our cached values.
     """
     # First call the orignal checkcache as intended
     linecache._checkcache_ori(*args)
     # Then, update back the cache with our data, so that tracebacks related
     # to our compiled codes can be produced.
     linecache.cache.update(linecache._ipython_cache)

IPython/utils/_process_cli.py

@@ -1,60 +1,63 b''
-"""
-cli-specific implementation of process utilities.
+"""cli-specific implementation of process utilities.
 
 cli - Common Language Infrastructure for IronPython. Code
       can run on any operating system. Check os.name for os-
       specific settings.
 
 This file is only meant to be imported by process.py, not by end-users.
+
+This file is largely untested. To become a full drop-in process
+interface for IronPython will probably require you to help fill
+in the details. 
 """
 
 # Import cli libraries:
 import clr
 import System
 
 # Import Python libraries:
 import os
 
 # Import IPython libraries:
 from IPython.utils import py3compat
 from ._process_common import arg_split
 
 def _find_cmd(cmd):
     """Find the full path to a command using which."""
     paths = System.Environment.GetEnvironmentVariable("PATH").Split(os.pathsep)
     for path in paths:
         filename = os.path.join(path, cmd)
         if System.IO.File.Exists(filename):
             return py3compat.bytes_to_str(filename)
     raise OSError("command %r not found" % cmd)
 
 def system(cmd):
     """
     system(cmd) should work in a cli environment on Mac OSX, Linux,
     and Windows
     """
     psi = System.Diagnostics.ProcessStartInfo(cmd)
     psi.RedirectStandardOutput = True
     psi.RedirectStandardError = True
     psi.WindowStyle = System.Diagnostics.ProcessWindowStyle.Normal
     psi.UseShellExecute = False
     # Start up process:
     reg = System.Diagnostics.Process.Start(psi)
 
 def getoutput(cmd):
     """
     getoutput(cmd) should work in a cli environment on Mac OSX, Linux,
     and Windows
     """
     psi = System.Diagnostics.ProcessStartInfo(cmd)
     psi.RedirectStandardOutput = True
     psi.RedirectStandardError = True
     psi.WindowStyle = System.Diagnostics.ProcessWindowStyle.Normal
     psi.UseShellExecute = False
     # Start up process:
     reg = System.Diagnostics.Process.Start(psi)
     myOutput = reg.StandardOutput
     output = myOutput.ReadToEnd()
     myError = reg.StandardError
     error = myError.ReadToEnd()
     return output