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119 lines
4.1 KiB
119 lines
4.1 KiB
8 years ago
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import os
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import sys
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import codecs
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from ._compat import PY2
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# If someone wants to vendor click, we want to ensure the
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# correct package is discovered. Ideally we could use a
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# relative import here but unfortunately Python does not
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# support that.
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click = sys.modules[__name__.rsplit('.', 1)[0]]
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def _find_unicode_literals_frame():
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import __future__
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frm = sys._getframe(1)
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idx = 1
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while frm is not None:
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if frm.f_globals.get('__name__', '').startswith('click.'):
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frm = frm.f_back
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idx += 1
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elif frm.f_code.co_flags & __future__.unicode_literals.compiler_flag:
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return idx
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else:
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break
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return 0
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def _check_for_unicode_literals():
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if not __debug__:
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return
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if not PY2 or click.disable_unicode_literals_warning:
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return
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bad_frame = _find_unicode_literals_frame()
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if bad_frame <= 0:
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return
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from warnings import warn
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warn(Warning('Click detected the use of the unicode_literals '
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'__future__ import. This is heavily discouraged '
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'because it can introduce subtle bugs in your '
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'code. You should instead use explicit u"" literals '
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'for your unicode strings. For more information see '
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'http://click.pocoo.org/python3/'),
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stacklevel=bad_frame)
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def _verify_python3_env():
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"""Ensures that the environment is good for unicode on Python 3."""
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if PY2:
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return
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try:
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import locale
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fs_enc = codecs.lookup(locale.getpreferredencoding()).name
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except Exception:
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fs_enc = 'ascii'
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if fs_enc != 'ascii':
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return
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extra = ''
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if os.name == 'posix':
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import subprocess
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rv = subprocess.Popen(['locale', '-a'], stdout=subprocess.PIPE,
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stderr=subprocess.PIPE).communicate()[0]
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good_locales = set()
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has_c_utf8 = False
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# Make sure we're operating on text here.
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if isinstance(rv, bytes):
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rv = rv.decode('ascii', 'replace')
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for line in rv.splitlines():
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locale = line.strip()
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if locale.lower().endswith(('.utf-8', '.utf8')):
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good_locales.add(locale)
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if locale.lower() in ('c.utf8', 'c.utf-8'):
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has_c_utf8 = True
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extra += '\n\n'
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if not good_locales:
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extra += (
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'Additional information: on this system no suitable UTF-8\n'
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'locales were discovered. This most likely requires resolving\n'
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'by reconfiguring the locale system.'
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)
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elif has_c_utf8:
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extra += (
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'This system supports the C.UTF-8 locale which is recommended.\n'
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'You might be able to resolve your issue by exporting the\n'
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'following environment variables:\n\n'
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' export LC_ALL=C.UTF-8\n'
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' export LANG=C.UTF-8'
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)
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else:
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extra += (
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'This system lists a couple of UTF-8 supporting locales that\n'
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'you can pick from. The following suitable locales where\n'
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'discovered: %s'
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) % ', '.join(sorted(good_locales))
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bad_locale = None
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for locale in os.environ.get('LC_ALL'), os.environ.get('LANG'):
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if locale and locale.lower().endswith(('.utf-8', '.utf8')):
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bad_locale = locale
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if locale is not None:
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break
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if bad_locale is not None:
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extra += (
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'\n\nClick discovered that you exported a UTF-8 locale\n'
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'but the locale system could not pick up from it because\n'
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'it does not exist. The exported locale is "%s" but it\n'
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'is not supported'
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) % bad_locale
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raise RuntimeError('Click will abort further execution because Python 3 '
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'was configured to use ASCII as encoding for the '
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'environment. Consult http://click.pocoo.org/python3/'
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'for mitigation steps.' + extra)
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