Print message on stderr if annotated html cannot be read.

IPython/extensions/cythonmagic.py

@@ -1,208 +1,220
 # -*- coding: utf-8 -*-
 """
 Cython related magics.
 
 Author:
 * Brian Granger
 
 Parts of this code were taken from Cython.inline.
 """
 #-----------------------------------------------------------------------------
 # Copyright (C) 2010-2011, IPython Development Team.
 #
 # Distributed under the terms of the Modified BSD License.
 #
 # The full license is in the file COPYING.txt, distributed with this software.
 #-----------------------------------------------------------------------------
 
+from __future__ import print_function
+
 import io
 import os, sys
 import imp
 
 try:
     import hashlib
 except ImportError:
     import md5 as hashlib
 
 from distutils.core import Distribution, Extension
 from distutils.command.build_ext import build_ext
 
 from IPython.core import display
 from IPython.core import magic_arguments
 from IPython.core.magic import Magics, magics_class, cell_magic
 from IPython.testing.skipdoctest import skip_doctest
 from IPython.utils import py3compat
 
 import Cython
 from Cython.Compiler.Errors import CompileError
 from Cython.Build.Dependencies import cythonize
 
 
 @magics_class
 class CythonMagics(Magics):
 
     def __init__(self, shell):
         super(CythonMagics,self).__init__(shell)
         self._reloads = {}
         self._code_cache = {}
 
     def _import_all(self, module):
         for k,v in module.__dict__.items():
             if not k.startswith('__'):
                 self.shell.push({k:v})
 
     @cell_magic
     def cython_inline(self, line, cell):
         """Compile and run a Cython code cell using Cython.inline.
 
         This magic simply passes the body of the cell to Cython.inline
         and returns the result. If the variables `a` and `b` are defined
         in the user's namespace, here is a simple example that returns
         their sum::
         
             %%cython_inline
             return a+b
 
         For most purposes, we recommend the usage of the `%%cython` magic.
         """
         locs = self.shell.user_global_ns
         globs = self.shell.user_ns
         return Cython.inline(cell, locals=locs, globals=globs)
 
     @cell_magic
     def cython_pyximport(self, line, cell):
         """Compile and import a Cython code cell using pyximport.
 
         The contents of the cell are written to a `.pyx` file in the current
         working directory, which is then imported using `pyximport`. This
         magic requires a module name to be passed::
         
             %%cython_pyximport modulename
             def f(x):
                 return 2.0*x
 
         The compiled module is then imported and all of its symbols are injected into
         the user's namespace. For most purposes, we recommend the usage of the
         `%%cython` magic.
         """
         module_name = line.strip()
         if not module_name:
             raise ValueError('module name must be given')
         fname = module_name + '.pyx'
         with io.open(fname, 'w', encoding='utf-8') as f:
             f.write(cell)
         if 'pyximport' not in sys.modules:
             import pyximport
             pyximport.install(reload_support=True)
         if module_name in self._reloads:
             module = self._reloads[module_name]
             reload(module)
         else:
             __import__(module_name)
             module = sys.modules[module_name]
             self._reloads[module_name] = module
         self._import_all(module)
 
     @magic_arguments.magic_arguments()
     @magic_arguments.argument(
         '-c', '--compile-args', action='append', default=[],
         help="Extra flags to pass to compiler via the `extra_compile_args` Extension flag (can be specified  multiple times)."
     )
     @magic_arguments.argument(
         '-l', '--lib', action='append', default=[],
         help="Add a library to link the extension against (can be specified  multiple times)."
     )
     @magic_arguments.argument(
         '-I', '--include', action='append', default=[],
         help="Add a path to the list of include directories (can be specified  multiple times)."
     )
     @magic_arguments.argument(
         '-f', '--force', action='store_true', default=False,
         help="Force the compilation of the pyx module even if it hasn't changed"
     )
     @magic_arguments.argument(
         '-a', '--annotate', action='store_true', default=False,
         help="Produce a colorized HTML version of the source. (Implies --force)."
     )
     @cell_magic
     def cython(self, line, cell):
         """Compile and import everything from a Cython code cell.
 
         The contents of the cell are written to a `.pyx` file in the
         directory `IPYTHONDIR/cython` using a filename with the hash of the code.
         This file is then cythonized and compiled. The resulting module
         is imported and all of its symbols are injected into the user's
         namespace. The usage is similar to that of `%%cython_pyximport` but
         you don't have to pass a module name::
 
         %%cython
         def f(x):
             return 2.0*x
         """
         args = magic_arguments.parse_argstring(self.cython, line)
         code = cell if cell.endswith('\n') else cell+'\n'
         lib_dir = os.path.join(self.shell.ipython_dir, 'cython')
         quiet = True
         key = code, sys.version_info, sys.executable, Cython.__version__
         module_name = "_cython_magic_" + hashlib.md5(str(key).encode('utf-8')).hexdigest()
         so_ext = [ ext for ext,_,mod_type in imp.get_suffixes() if mod_type == imp.C_EXTENSION ][0]
         module_path = os.path.join(lib_dir, module_name+so_ext)
 
         if args.annotate:
             args.force = True
 
         if not os.path.exists(lib_dir):
             os.makedirs(lib_dir)
 
         if args.force or not os.path.isfile(module_path):
             c_include_dirs = args.include
             if 'numpy' in code:
                 import numpy
                 c_include_dirs.append(numpy.get_include())
             pyx_file = os.path.join(lib_dir, module_name + '.pyx')
             pyx_file = py3compat.cast_bytes_py2(pyx_file, encoding=sys.getfilesystemencoding())
             with io.open(pyx_file, 'w', encoding='utf-8') as f:
                 f.write(code)
             extension = Extension(
                 name = module_name,
                 sources = [pyx_file],
                 include_dirs = c_include_dirs,
                 extra_compile_args = args.compile_args,
                 libraries = args.lib,
             )
             dist = Distribution()
             config_files = dist.find_config_files()
             try: 
                 config_files.remove('setup.cfg')
             except ValueError:
                 pass
             dist.parse_config_files(config_files)
             build_extension = build_ext(dist)
             build_extension.finalize_options()
             try:
                 build_extension.extensions = cythonize([extension], quiet=quiet,
                                                        annotate=args.annotate, force=args.force)
             except CompileError:
                 return
             build_extension.build_temp = os.path.dirname(pyx_file)
             build_extension.build_lib  = lib_dir
             build_extension.run()
             self._code_cache[key] = module_name
 
         module = imp.load_dynamic(module_name, module_path)
         self._import_all(module)
 
         if args.annotate:
             html_file = os.path.join(lib_dir, module_name + '.html')
-            with io.open(html_file, encoding='utf-8') as f:
-                annotated_html = f.read()
-            return display.HTML(annotated_html)
+            try:
+                with io.open(html_file, encoding='utf-8') as f:
+                    annotated_html = f.read()
+            except IOError as e:
+                # File could not be opened. Most likely the user has a version
+                # of Cython before 0.15.1 (when `cythonize` learned the
+                # `force` keyword argument) and has already compiled this
+                # exact source without annotation.
+                print('Cython completed successfully but the annotated '
+                      'source could not be read.', file=sys.stderr)
+                print(e, file=sys.stderr)
+            else:
+                return display.HTML(annotated_html)
 
 _loaded = False
 
 def load_ipython_extension(ip):
     """Load the extension in IPython."""
     global _loaded
     if not _loaded:
         ip.register_magics(CythonMagics)
         _loaded = True