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441 lines
15 KiB
441 lines
15 KiB
import os
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import sys
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from .globals import resolve_color_default
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from ._compat import text_type, open_stream, get_filesystem_encoding, \
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get_streerror, string_types, PY2, binary_streams, text_streams, \
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filename_to_ui, auto_wrap_for_ansi, strip_ansi, should_strip_ansi, \
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_default_text_stdout, _default_text_stderr, is_bytes, WIN
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if not PY2:
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from ._compat import _find_binary_writer
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elif WIN:
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from ._winconsole import _get_windows_argv, \
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_hash_py_argv, _initial_argv_hash
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echo_native_types = string_types + (bytes, bytearray)
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def _posixify(name):
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return '-'.join(name.split()).lower()
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def safecall(func):
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"""Wraps a function so that it swallows exceptions."""
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def wrapper(*args, **kwargs):
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try:
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return func(*args, **kwargs)
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except Exception:
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pass
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return wrapper
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def make_str(value):
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"""Converts a value into a valid string."""
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if isinstance(value, bytes):
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try:
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return value.decode(get_filesystem_encoding())
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except UnicodeError:
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return value.decode('utf-8', 'replace')
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return text_type(value)
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def make_default_short_help(help, max_length=45):
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"""Return a condensed version of help string."""
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words = help.split()
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total_length = 0
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result = []
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done = False
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for word in words:
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if word[-1:] == '.':
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done = True
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new_length = result and 1 + len(word) or len(word)
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if total_length + new_length > max_length:
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result.append('...')
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done = True
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else:
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if result:
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result.append(' ')
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result.append(word)
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if done:
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break
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total_length += new_length
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return ''.join(result)
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class LazyFile(object):
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"""A lazy file works like a regular file but it does not fully open
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the file but it does perform some basic checks early to see if the
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filename parameter does make sense. This is useful for safely opening
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files for writing.
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"""
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def __init__(self, filename, mode='r', encoding=None, errors='strict',
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atomic=False):
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self.name = filename
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self.mode = mode
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self.encoding = encoding
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self.errors = errors
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self.atomic = atomic
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if filename == '-':
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self._f, self.should_close = open_stream(filename, mode,
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encoding, errors)
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else:
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if 'r' in mode:
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# Open and close the file in case we're opening it for
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# reading so that we can catch at least some errors in
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# some cases early.
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open(filename, mode).close()
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self._f = None
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self.should_close = True
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def __getattr__(self, name):
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return getattr(self.open(), name)
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def __repr__(self):
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if self._f is not None:
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return repr(self._f)
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return '<unopened file %r %s>' % (self.name, self.mode)
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def open(self):
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"""Opens the file if it's not yet open. This call might fail with
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a :exc:`FileError`. Not handling this error will produce an error
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that Click shows.
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"""
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if self._f is not None:
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return self._f
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try:
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rv, self.should_close = open_stream(self.name, self.mode,
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self.encoding,
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self.errors,
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atomic=self.atomic)
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except (IOError, OSError) as e:
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from .exceptions import FileError
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raise FileError(self.name, hint=get_streerror(e))
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self._f = rv
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return rv
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def close(self):
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"""Closes the underlying file, no matter what."""
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if self._f is not None:
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self._f.close()
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def close_intelligently(self):
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"""This function only closes the file if it was opened by the lazy
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file wrapper. For instance this will never close stdin.
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"""
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if self.should_close:
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self.close()
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def __enter__(self):
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return self
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def __exit__(self, exc_type, exc_value, tb):
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self.close_intelligently()
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def __iter__(self):
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self.open()
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return iter(self._f)
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class KeepOpenFile(object):
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def __init__(self, file):
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self._file = file
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def __getattr__(self, name):
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return getattr(self._file, name)
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def __enter__(self):
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return self
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def __exit__(self, exc_type, exc_value, tb):
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pass
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def __repr__(self):
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return repr(self._file)
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def __iter__(self):
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return iter(self._file)
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def echo(message=None, file=None, nl=True, err=False, color=None):
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"""Prints a message plus a newline to the given file or stdout. On
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first sight, this looks like the print function, but it has improved
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support for handling Unicode and binary data that does not fail no
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matter how badly configured the system is.
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Primarily it means that you can print binary data as well as Unicode
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data on both 2.x and 3.x to the given file in the most appropriate way
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possible. This is a very carefree function in that it will try its
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best to not fail. As of Click 6.0 this includes support for unicode
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output on the Windows console.
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In addition to that, if `colorama`_ is installed, the echo function will
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also support clever handling of ANSI codes. Essentially it will then
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do the following:
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- add transparent handling of ANSI color codes on Windows.
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- hide ANSI codes automatically if the destination file is not a
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terminal.
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.. _colorama: https://pypi.org/project/colorama/
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.. versionchanged:: 6.0
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As of Click 6.0 the echo function will properly support unicode
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output on the windows console. Not that click does not modify
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the interpreter in any way which means that `sys.stdout` or the
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print statement or function will still not provide unicode support.
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.. versionchanged:: 2.0
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Starting with version 2.0 of Click, the echo function will work
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with colorama if it's installed.
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.. versionadded:: 3.0
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The `err` parameter was added.
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.. versionchanged:: 4.0
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Added the `color` flag.
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:param message: the message to print
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:param file: the file to write to (defaults to ``stdout``)
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:param err: if set to true the file defaults to ``stderr`` instead of
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``stdout``. This is faster and easier than calling
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:func:`get_text_stderr` yourself.
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:param nl: if set to `True` (the default) a newline is printed afterwards.
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:param color: controls if the terminal supports ANSI colors or not. The
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default is autodetection.
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"""
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if file is None:
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if err:
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file = _default_text_stderr()
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else:
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file = _default_text_stdout()
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# Convert non bytes/text into the native string type.
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if message is not None and not isinstance(message, echo_native_types):
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message = text_type(message)
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if nl:
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message = message or u''
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if isinstance(message, text_type):
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message += u'\n'
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else:
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message += b'\n'
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# If there is a message, and we're in Python 3, and the value looks
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# like bytes, we manually need to find the binary stream and write the
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# message in there. This is done separately so that most stream
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# types will work as you would expect. Eg: you can write to StringIO
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# for other cases.
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if message and not PY2 and is_bytes(message):
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binary_file = _find_binary_writer(file)
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if binary_file is not None:
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file.flush()
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binary_file.write(message)
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binary_file.flush()
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return
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# ANSI-style support. If there is no message or we are dealing with
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# bytes nothing is happening. If we are connected to a file we want
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# to strip colors. If we are on windows we either wrap the stream
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# to strip the color or we use the colorama support to translate the
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# ansi codes to API calls.
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if message and not is_bytes(message):
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color = resolve_color_default(color)
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if should_strip_ansi(file, color):
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message = strip_ansi(message)
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elif WIN:
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if auto_wrap_for_ansi is not None:
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file = auto_wrap_for_ansi(file)
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elif not color:
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message = strip_ansi(message)
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if message:
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file.write(message)
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file.flush()
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def get_binary_stream(name):
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"""Returns a system stream for byte processing. This essentially
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returns the stream from the sys module with the given name but it
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solves some compatibility issues between different Python versions.
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Primarily this function is necessary for getting binary streams on
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Python 3.
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:param name: the name of the stream to open. Valid names are ``'stdin'``,
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``'stdout'`` and ``'stderr'``
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"""
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opener = binary_streams.get(name)
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if opener is None:
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raise TypeError('Unknown standard stream %r' % name)
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return opener()
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def get_text_stream(name, encoding=None, errors='strict'):
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"""Returns a system stream for text processing. This usually returns
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a wrapped stream around a binary stream returned from
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:func:`get_binary_stream` but it also can take shortcuts on Python 3
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for already correctly configured streams.
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:param name: the name of the stream to open. Valid names are ``'stdin'``,
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``'stdout'`` and ``'stderr'``
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:param encoding: overrides the detected default encoding.
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:param errors: overrides the default error mode.
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"""
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opener = text_streams.get(name)
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if opener is None:
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raise TypeError('Unknown standard stream %r' % name)
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return opener(encoding, errors)
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def open_file(filename, mode='r', encoding=None, errors='strict',
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lazy=False, atomic=False):
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"""This is similar to how the :class:`File` works but for manual
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usage. Files are opened non lazy by default. This can open regular
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files as well as stdin/stdout if ``'-'`` is passed.
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If stdin/stdout is returned the stream is wrapped so that the context
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manager will not close the stream accidentally. This makes it possible
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to always use the function like this without having to worry to
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accidentally close a standard stream::
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with open_file(filename) as f:
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...
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.. versionadded:: 3.0
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:param filename: the name of the file to open (or ``'-'`` for stdin/stdout).
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:param mode: the mode in which to open the file.
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:param encoding: the encoding to use.
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:param errors: the error handling for this file.
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:param lazy: can be flipped to true to open the file lazily.
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:param atomic: in atomic mode writes go into a temporary file and it's
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moved on close.
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"""
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if lazy:
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return LazyFile(filename, mode, encoding, errors, atomic=atomic)
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f, should_close = open_stream(filename, mode, encoding, errors,
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atomic=atomic)
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if not should_close:
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f = KeepOpenFile(f)
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return f
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def get_os_args():
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"""This returns the argument part of sys.argv in the most appropriate
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form for processing. What this means is that this return value is in
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a format that works for Click to process but does not necessarily
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correspond well to what's actually standard for the interpreter.
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On most environments the return value is ``sys.argv[:1]`` unchanged.
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However if you are on Windows and running Python 2 the return value
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will actually be a list of unicode strings instead because the
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default behavior on that platform otherwise will not be able to
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carry all possible values that sys.argv can have.
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.. versionadded:: 6.0
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"""
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# We can only extract the unicode argv if sys.argv has not been
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# changed since the startup of the application.
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if PY2 and WIN and _initial_argv_hash == _hash_py_argv():
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return _get_windows_argv()
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return sys.argv[1:]
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def format_filename(filename, shorten=False):
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"""Formats a filename for user display. The main purpose of this
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function is to ensure that the filename can be displayed at all. This
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will decode the filename to unicode if necessary in a way that it will
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not fail. Optionally, it can shorten the filename to not include the
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full path to the filename.
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:param filename: formats a filename for UI display. This will also convert
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the filename into unicode without failing.
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:param shorten: this optionally shortens the filename to strip of the
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path that leads up to it.
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"""
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if shorten:
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filename = os.path.basename(filename)
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return filename_to_ui(filename)
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def get_app_dir(app_name, roaming=True, force_posix=False):
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r"""Returns the config folder for the application. The default behavior
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is to return whatever is most appropriate for the operating system.
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To give you an idea, for an app called ``"Foo Bar"``, something like
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the following folders could be returned:
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Mac OS X:
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``~/Library/Application Support/Foo Bar``
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Mac OS X (POSIX):
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``~/.foo-bar``
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Unix:
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``~/.config/foo-bar``
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Unix (POSIX):
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``~/.foo-bar``
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Win XP (roaming):
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``C:\Documents and Settings\<user>\Local Settings\Application Data\Foo Bar``
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Win XP (not roaming):
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``C:\Documents and Settings\<user>\Application Data\Foo Bar``
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Win 7 (roaming):
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``C:\Users\<user>\AppData\Roaming\Foo Bar``
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Win 7 (not roaming):
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``C:\Users\<user>\AppData\Local\Foo Bar``
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.. versionadded:: 2.0
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:param app_name: the application name. This should be properly capitalized
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and can contain whitespace.
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:param roaming: controls if the folder should be roaming or not on Windows.
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Has no affect otherwise.
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:param force_posix: if this is set to `True` then on any POSIX system the
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folder will be stored in the home folder with a leading
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dot instead of the XDG config home or darwin's
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application support folder.
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"""
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if WIN:
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key = roaming and 'APPDATA' or 'LOCALAPPDATA'
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folder = os.environ.get(key)
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if folder is None:
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folder = os.path.expanduser('~')
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return os.path.join(folder, app_name)
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if force_posix:
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return os.path.join(os.path.expanduser('~/.' + _posixify(app_name)))
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if sys.platform == 'darwin':
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return os.path.join(os.path.expanduser(
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'~/Library/Application Support'), app_name)
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return os.path.join(
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os.environ.get('XDG_CONFIG_HOME', os.path.expanduser('~/.config')),
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_posixify(app_name))
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class PacifyFlushWrapper(object):
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"""This wrapper is used to catch and suppress BrokenPipeErrors resulting
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from ``.flush()`` being called on broken pipe during the shutdown/final-GC
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of the Python interpreter. Notably ``.flush()`` is always called on
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``sys.stdout`` and ``sys.stderr``. So as to have minimal impact on any
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other cleanup code, and the case where the underlying file is not a broken
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pipe, all calls and attributes are proxied.
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"""
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def __init__(self, wrapped):
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self.wrapped = wrapped
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def flush(self):
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try:
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self.wrapped.flush()
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except IOError as e:
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import errno
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if e.errno != errno.EPIPE:
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raise
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def __getattr__(self, attr):
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return getattr(self.wrapped, attr)
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