Version 0.1.0 pre-release

.editorconfig

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+# Check http://editorconfig.org for more information
+# This is the main config file for this project:
+root = true
+
+[*]
+charset = utf-8
+trim_trailing_whitespace = true
+end_of_line = lf
+indent_style = space
+insert_final_newline = true
+indent_size = 2
+
+[*.py]
+indent_size = 4
+
+[tests/fixtures/incorrect.py]
+# We need it for better testing final spaces:
+trim_trailing_whitespace = false

.gitignore

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+#### joe made this: http://goel.io/joe
+#### python ####
+# Byte-compiled / optimized / DLL files
+.pytest_cache
+__pycache__/
+*.py[cod]
+*$py.class
+
+# C extensions
+*.so
+
+# Distribution / packaging
+.Python
+build/
+develop-eggs/
+dist/
+downloads/
+eggs/
+.eggs/
+lib/
+lib64/
+parts/
+sdist/
+var/
+wheels/
+*.egg-info/
+.installed.cfg
+*.egg
+
+# PyInstaller
+#  Usually these files are written by a python script from a template
+#  before PyInstaller builds the exe, so as to inject date/other infos into it.
+*.manifest
+*.spec
+
+# Installer logs
+pip-log.txt
+pip-delete-this-directory.txt
+
+# Unit test / coverage reports
+htmlcov/
+.tox/
+.coverage
+.coverage.*
+.cache
+nosetests.xml
+coverage.xml
+*.cover
+.hypothesis/
+
+# Translations
+*.mo
+*.pot
+
+# Django stuff:
+*.log
+local_settings.py
+
+# Flask stuff:
+instance/
+.webassets-cache
+
+# Scrapy stuff:
+.scrapy
+
+# Sphinx documentation
+docs/_build/
+
+# PyBuilder
+target/
+
+# Jupyter Notebook
+.ipynb_checkpoints
+
+# pyenv
+.python-version
+
+# celery beat schedule file
+celerybeat-schedule
+
+# SageMath parsed files
+*.sage.py
+
+# Environments
+.env
+.venv
+env/
+venv/
+ENV/
+
+# Spyder project settings
+.spyderproject
+.spyproject
+
+# Rope project settings
+.ropeproject
+
+# mkdocs documentation
+/site
+
+# mypy
+.mypy_cache/
+#### macos ####
+# General
+*.DS_Store
+.AppleDouble
+.LSOverride
+
+# Icon must end with two \r
+Icon
+
+
+# Thumbnails
+._*
+
+# Files that might appear in the root of a volume
+.DocumentRevisions-V100
+.fseventsd
+.Spotlight-V100
+.TemporaryItems
+.Trashes
+.VolumeIcon.icns
+.com.apple.timemachine.donotpresent
+
+# Directories potentially created on remote AFP share
+.AppleDB
+.AppleDesktop
+Network Trash Folder
+Temporary Items
+.apdisk
+#### windows ####
+# Windows thumbnail cache files
+Thumbs.db
+ehthumbs.db
+ehthumbs_vista.db
+
+# Dump file
+*.stackdump
+
+# Folder config file
+Desktop.ini
+
+# Recycle Bin used on file shares
+$RECYCLE.BIN/
+
+# Windows Installer files
+*.cab
+*.msi
+*.msm
+*.msp
+
+# Windows shortcuts
+*.lnk
+#### linux ####
+*~
+
+# temporary files which can be created if a process still has a handle open of a deleted file
+.fuse_hidden*
+
+# KDE directory preferences
+.directory
+
+# Linux trash folder which might appear on any partition or disk
+.Trash-*
+
+# .nfs files are created when an open file is removed but is still being accessed
+.nfs*
+#### jetbrains ####
+# Covers JetBrains IDEs: IntelliJ, RubyMine, PhpStorm, AppCode, PyCharm, CLion, Android Studio and Webstorm
+# Reference: https://intellij-support.jetbrains.com/hc/en-us/articles/206544839
+
+# User-specific stuff:
+.idea/
+
+## File-based project format:
+*.iws
+
+## Plugin-specific files:
+
+# IntelliJ
+/out/
+
+# mpeltonen/sbt-idea plugin
+.idea_modules/
+
+# JIRA plugin
+atlassian-ide-plugin.xml
+
+# Cursive Clojure plugin
+.idea/replstate.xml
+
+# Crashlytics plugin (for Android Studio and IntelliJ)
+com_crashlytics_export_strings.xml
+crashlytics.properties
+crashlytics-build.properties
+fabric.properties

.travis.yml

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+language: python
+
+matrix:
+  fast_finish: true
+  include:
+    - python: 3.6
+    - python: 3.7
+      dist: xenial
+      sudo: true
+
+install:
+  - pip install poetry
+  - poetry install
+  - poetry develop
+
+script:
+  - poetry run pytest
+  - poetry run mypy flake8_broken_line.py
+
+after_success:
+  - pip install coveralls
+  - coveralls
+
+notifications:
+  email:
+    on_success: never
+    on_failure: change

README.md

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+# flake8-broken-line
+
+[![wemake.services](https://img.shields.io/badge/-wemake.services-green.svg?label=%20&logo=data%3Aimage%2Fpng%3Bbase64%2CiVBORw0KGgoAAAANSUhEUgAAABAAAAAQCAMAAAAoLQ9TAAAABGdBTUEAALGPC%2FxhBQAAAAFzUkdCAK7OHOkAAAAbUExURQAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAP%2F%2F%2F5TvxDIAAAAIdFJOUwAjRA8xXANAL%2Bv0SAAAADNJREFUGNNjYCAIOJjRBdBFWMkVQeGzcHAwksJnAPPZGOGAASzPzAEHEGVsLExQwE7YswCb7AFZSF3bbAAAAABJRU5ErkJggg%3D%3D)](https://wemake.services) [![Build Status](https://travis-ci.org/sobolevn/flake8-broken-line.svg?branch=master)](https://travis-ci.org/sobolevn/flake8-broken-line) [![Coverage](https://coveralls.io/repos/github/sobolevn/flake8-broken-line/badge.svg?branch=master)](https://coveralls.io/github/sobolevn/flake8-broken-line?branch=master) [![Python Version](https://img.shields.io/pypi/pyversions/flake8-broken-line.svg)](https://pypi.org/project/flake8-broken-line/) [![PyPI version](https://badge.fury.io/py/flake8-broken-line.svg)](https://pypi.org/project/flake8-broken-line/)
+
+Do not break the line! 🚨
+
+## Installation
+
+```bash
+pip install flake8-broken-line
+```
+
+## Code example
+
+Things we check with this plugin:
+
+```python
+# String line breaks, use `()` or `"""` instead:
+
+some_string = 'first line\
+second line'
+
+# Use a single line, `()`, or new variables instead:
+
+if 1 == 1 and \
+    2 == 2:
+    print('Do not do that!')
+
+```
+
+## Error codes
+
+| Error code |                   Description                 |
+|:----------:|:---------------------------------------------:|
+|    N400    | Found backslash that is used for line braking |
+
+## License
+
+MIT.

flake8_broken_line.py

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+# -*- coding: utf-8 -*-
+
+import re
+from typing import Optional, Tuple
+
+import pkg_resources
+
+pkg_name = 'flake8-broken-line'
+
+#: We store the version number inside the `pyproject.toml`:
+pkg_version: str = pkg_resources.get_distribution(pkg_name).version
+
+INVALID_LINE_BREAK = re.compile(r'(?<!\\)\\$', re.M)
+
+N400 = 'N400: Found backslash that is used for line braking'
+
+
+def check_line_breaks(physical_line: str) -> Optional[Tuple[int, str]]:
+    """Functional ``flake8`` plugin to check for backslashes."""
+    if INVALID_LINE_BREAK.search(physical_line.rstrip()):
+        return 0, N400
+    return None
+
+
+# Flake8 API definition:
+check_line_breaks.name = pkg_name  # type: ignore
+check_line_breaks.version = pkg_version  # type: ignore