author | Augie Fackler <augie@google.com> |
Tue, 13 Feb 2018 17:25:43 -0500 | |
changeset 36168 | be73fa5b42d3 |
parent 33860 | 3cfc9070245f |
child 37843 | 670eb4fa1b86 |
permissions | -rw-r--r-- |
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# hgdemandimport - global demand-loading of modules for Mercurial |
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# |
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# Copyright 2017 Facebook Inc. |
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# |
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# This software may be used and distributed according to the terms of the |
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# GNU General Public License version 2 or any later version. |
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'''demandimport - automatic demand-loading of modules''' |
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# This is in a separate package from mercurial because in Python 3, |
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# demand loading is per-package. Keeping demandimport in the mercurial package |
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# would disable demand loading for any modules in mercurial. |
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from __future__ import absolute_import |
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import os |
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import sys |
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if sys.version_info[0] >= 3: |
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from . import demandimportpy3 as demandimport |
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else: |
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from . import demandimportpy2 as demandimport |
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# Extensions can add to this list if necessary. |
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ignore = [ |
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'__future__', |
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'_hashlib', |
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# ImportError during pkg_resources/__init__.py:fixup_namespace_package |
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'_imp', |
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'_xmlplus', |
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'fcntl', |
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'nt', # pathlib2 tests the existence of built-in 'nt' module |
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'win32com.gen_py', |
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'win32com.shell', # 'appdirs' tries to import win32com.shell |
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'_winreg', # 2.7 mimetypes needs immediate ImportError |
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'pythoncom', |
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# imported by tarfile, not available under Windows |
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'pwd', |
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'grp', |
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# imported by profile, itself imported by hotshot.stats, |
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# not available under Windows |
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'resource', |
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# this trips up many extension authors |
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'gtk', |
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# setuptools' pkg_resources.py expects "from __main__ import x" to |
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# raise ImportError if x not defined |
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'__main__', |
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'_ssl', # conditional imports in the stdlib, issue1964 |
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'_sre', # issue4920 |
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'rfc822', |
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'mimetools', |
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'sqlalchemy.events', # has import-time side effects (issue5085) |
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# setuptools 8 expects this module to explode early when not on windows |
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'distutils.msvc9compiler', |
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'__builtin__', |
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'builtins', |
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'urwid.command_map', # for pudb |
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] |
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_pypy = '__pypy__' in sys.builtin_module_names |
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if _pypy: |
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ignore.extend([ |
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# _ctypes.pointer is shadowed by "from ... import pointer" (PyPy 5) |
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'_ctypes.pointer', |
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]) |
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demandimport.init(ignore) |
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# Re-export. |
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isenabled = demandimport.isenabled |
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disable = demandimport.disable |
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deactivated = demandimport.deactivated |
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def enable(): |
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# chg pre-imports modules so do not enable demandimport for it |
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if ('CHGINTERNALMARK' not in os.environ |
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and os.environ.get('HGDEMANDIMPORT') != 'disable'): |
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demandimport.enable() |