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annotate hgdemandimport/__init__.py @ 45531:b0d6309ff50c
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Differential Revision: https://phab.mercurial-scm.org/D9005
author | Antoine Cezar <antoine.cezar@octobus.net> |
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date | Wed, 02 Sep 2020 15:23:25 +0200 |
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children | 07731064ac41 |
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1 # hgdemandimport - global demand-loading of modules for Mercurial |
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2 # |
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3 # Copyright 2017 Facebook Inc. |
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4 # |
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5 # This software may be used and distributed according to the terms of the |
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6 # GNU General Public License version 2 or any later version. |
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7 |
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8 '''demandimport - automatic demand-loading of modules''' |
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9 |
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10 # This is in a separate package from mercurial because in Python 3, |
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11 # demand loading is per-package. Keeping demandimport in the mercurial package |
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12 # would disable demand loading for any modules in mercurial. |
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13 |
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14 from __future__ import absolute_import |
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15 |
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16 import os |
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17 import sys |
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18 |
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19 if sys.version_info[0] >= 3: |
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20 from . import demandimportpy3 as demandimport |
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21 else: |
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22 from . import demandimportpy2 as demandimport |
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23 |
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24 # Full module names which can't be lazy imported. |
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25 # Extensions can add to this set. |
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26 IGNORES = { |
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27 '__future__', |
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28 '_hashlib', |
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29 # ImportError during pkg_resources/__init__.py:fixup_namespace_package |
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30 '_imp', |
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31 '_xmlplus', |
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32 'fcntl', |
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33 'nt', # pathlib2 tests the existence of built-in 'nt' module |
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34 'win32com.gen_py', |
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35 'win32com.shell', # 'appdirs' tries to import win32com.shell |
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36 '_winreg', # 2.7 mimetypes needs immediate ImportError |
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37 'pythoncom', |
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38 # imported by tarfile, not available under Windows |
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39 'pwd', |
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40 'grp', |
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41 # imported by profile, itself imported by hotshot.stats, |
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42 # not available under Windows |
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43 'resource', |
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44 # this trips up many extension authors |
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45 'gtk', |
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46 # setuptools' pkg_resources.py expects "from __main__ import x" to |
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47 # raise ImportError if x not defined |
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48 '__main__', |
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49 '_ast', # https://bugs.python.org/issue41631 |
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50 '_ssl', # conditional imports in the stdlib, issue1964 |
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51 '_sre', # issue4920 |
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52 'rfc822', |
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53 'mimetools', |
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54 'sqlalchemy.events', # has import-time side effects (issue5085) |
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55 # setuptools 8 expects this module to explode early when not on windows |
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56 'distutils.msvc9compiler', |
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57 '__builtin__', |
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58 'builtins', |
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59 'urwid.command_map', # for pudb |
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60 'lzma', |
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61 } |
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62 |
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63 _pypy = '__pypy__' in sys.builtin_module_names |
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64 |
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65 if _pypy: |
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66 # _ctypes.pointer is shadowed by "from ... import pointer" (PyPy 5) |
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67 IGNORES.add('_ctypes.pointer') |
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68 |
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69 demandimport.init(IGNORES) |
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70 |
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71 # Re-export. |
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72 isenabled = demandimport.isenabled |
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73 disable = demandimport.disable |
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74 deactivated = demandimport.deactivated |
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75 |
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76 |
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77 def enable(): |
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78 # chg pre-imports modules so do not enable demandimport for it |
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79 if ( |
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80 'CHGINTERNALMARK' not in os.environ |
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81 and os.environ.get('HGDEMANDIMPORT') != 'disable' |
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82 ): |
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83 demandimport.enable() |