Metadata-Version: 1.1
Name: safer
Version: 2.0.3
Summary: Try to import all modules below a given root
Home-page: https://github.com/rec/safer
Author: Tom Ritchford
Author-email: tom@swirly.com
License: MIT
Description: ✏️safer: a safer file opener ✏️
        -------------------------------
        
        No more partial writes or corruption!
        
        Install ``safer`` from the command line with `pip
        <https://pypi.org/project/pip/>`_: ``pip install safer``.
        
        Tested on Python 2.7, and 3.4 through 3.8.
        
        ``safer.open()``
        =================
        
        ``safer.open()`` writes a whole file or nothing. It's a drop-in replacement for
        built-in ``open()`` except that ``safer.open()`` leaves the original file
        unchanged on failure.
        
        EXAMPLE
        
        .. code-block:: python
        
            # dangerous
            with open(filename, 'w') as fp:
                json.dump(data, fp)
                # If an exception is raised, the file is empty or partly written
        
            # safer
            with safer.open(filename, 'w') as fp:
                json.dump(data, fp)
                # If an exception is raised, the file is unchanged.
        
        
        ``safer.open(filename)`` returns a file stream ``fp`` like ``open(filename)``
        would, except that ``fp`` writes to a temporary file in the same directory.
        
        If ``fp`` is used as a context manager and an exception is raised, then
        ``fp.safer_failed`` is automatically set to ``True``. And when ``fp.close()``
        is called, the temporary file is moved over ``filename`` *unless*
        ``fp.safer_failed`` is true.
        
        ------------------------------------
        
        ``safer.printer()``
        ===================
        
        ``safer.printer()`` is similar to ``safer.open()`` except it yields a function
        that prints to the open file - it's very convenient for printing text.
        
        Like ``safer.open()``, if an exception is raised within the context manager,
        the original file is left unchanged.
        
        EXAMPLE
        
        .. code-block:: python
        
            # dangerous
            with open(file, 'w') as fp:
                for item in items:
                    print(item, file=fp)
                # Prints lines until the first exception
        
            # safer
            with safer.printer(file) as print:
                for item in items:
                    print(item)
                # Either the whole file is written, or nothing
        
        NOTES
        --------
        
        If a stream ``fp`` return from ``safer.open()`` is used as a context manager
        and an exception is raised, the property ``fp.safer_failed`` is set to
        ``True``.
        
        In the method ``fp.close()``, if ``fp.safer_failed`` is *not* set, then the
        temporary file is moved over the original file, successfully completing the
        write.
        
        If ``fp.safer_failed`` is true, then if ``delete_failures`` is true, the
        temporary file is deleted.
        
        If the ``mode`` argument contains either ``'a'`` (append), or ``'+'`` (update),
        then the original file will be copied to the temporary file before writing
        starts.
        
        Note that ``safer`` uses an extra temporary file which is renamed over the file
        only after the stream closes without failing.  This uses as much disk space as
        the old and new files put together.
        
        FUNCTIONS
        ---------
        
        ARGUMENTS
        
          make_parents:
            If true, create the parent directory of the file if it doesn't exist
        
          delete_failures:
            If true, the temporary file is deleted if there is an exception
        
        The remaining arguments are the same as for built-in ``open()``.
        
        ``safer.open(name, mode='r', buffering=-1, encoding=None, errors=None, newline=None, closefd=True, opener=None, make_parents=False, delete_failures=True)``
            
            A drop-in replacement for ``open()`` which returns a stream which only
            overwrites the original file when close() is called, and only if there was no
            failure
        
        ``safer.printer(name, mode='r', buffering=-1, encoding=None, errors=None, newline=None, closefd=True, opener=None, make_parents=False, delete_failures=True)``
            
            A context manager that yields a function that prints to the opened file,
            only overwriting the original file at the exit of the context,
            and only if there was no exception thrown
        
        ``safer.writer(name, mode='r', buffering=-1, encoding=None, errors=None, newline=None, closefd=True, opener=None, make_parents=False, delete_failures=True)``
            
            (DEPRECATED) A shorthand for ``open(file, 'w')``
        
Keywords: testing,modules
Platform: UNKNOWN
Classifier: Development Status :: 4 - Beta
Classifier: Programming Language :: Python :: 2.7
Classifier: Programming Language :: Python :: 3.4
Classifier: Programming Language :: Python :: 3.5
Classifier: Programming Language :: Python :: 3.6
Classifier: Programming Language :: Python :: 3.7
Classifier: Programming Language :: Python :: 3.8
Classifier: Intended Audience :: Developers
Classifier: License :: OSI Approved :: MIT License
Classifier: Topic :: Software Development :: Libraries
Classifier: Topic :: Utilities
