Add first version of autonl.

CHANGELOG.rst

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+================
+autonl CHANGELOG
+================
+
+
+0.1.0 (2020-10-02)
+------------------
+- Format single file

README.rst

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+======
+autonl
+======
+
+autonl automatically formats newline at end of file.
+
+
+Installation
+============
+
+Installing from PyPI::
+
+    pip install --upgrade autonl
+
+
+Usage
+=====
+
+Formatting newline at end of file::
+
+    autonl <filename>

autonl/__init__.py

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+__version__ = '0.1.0'

autonl/cli.py

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+import argparse
+
+
+def main():
+    parser = argparse.ArgumentParser()
+    parser.add_argument('filename')
+
+    args = parser.parse_args()
+
+    _format(args.filename)
+
+
+def _format(filename):
+    with open(filename, mode='rb') as fp:
+        fp.seek(-1, 2)
+        last_byte = fp.read(1)
+
+    if last_byte == b'\n':
+        return
+
+    with open(filename, mode='ab') as fp:
+        fp.write(b'\n')

entry_points.cfg

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+[console_scripts]
+autonl = autonl.cli:main

setup.cfg

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+[metadata]
+name = autonl
+version = attr: autonl.__version__
+description = Manage newline at end of file
+long_description = file: README.rst
+long_description_content_type = text/x-rst
+url = https://github.com/yukihira1992/autonl
+author = Takayuki Hirayama
+author_email = [email protected]
+license = MIT
+classifiers =
+    Development Status :: 1 - Planning
+    Environment :: Console
+    Intended Audience :: Developers
+    License :: OSI Approved :: MIT License
+    Operating System :: OS Independent
+    Programming Language :: Python
+    Programming Language :: Python :: 3
+    Programming Language :: Python :: 3 :: Only
+    Programming Language :: Python :: 3.5
+    Programming Language :: Python :: 3.6
+    Programming Language :: Python :: 3.7
+    Programming Language :: Python :: 3.8
+    Topic :: Software Development :: Libraries :: Python Modules
+    Topic :: Software Development :: Quality Assurance
+    Topic :: Text Processing
+    Topic :: Text Processing :: Filters
+keywords = newline, text, EOF, automation, format
+
+[options]
+zip_safe = False
+python_requires = >=3.5
+packages =
+    autonl
+entry_points = file: entry_points.cfg

setup.py

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+from setuptools import setup
+
+setup()