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116 lines
3.3 KiB
ReStructuredText
116 lines
3.3 KiB
ReStructuredText
# Code Style
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The Synapse codebase uses a number of code formatting tools in order to
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quickly and automatically check for formatting (and sometimes logical) errors
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in code.
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The necessary tools are detailed below.
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## Formatting tools
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The Synapse codebase uses [black](https://pypi.org/project/black/) as an
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opinionated code formatter, ensuring all comitted code is properly
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formatted.
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First install ``black`` with::
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pip install --upgrade black
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Have ``black`` auto-format your code (it shouldn't change any
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functionality) with::
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black . --exclude="\.tox|build|env"
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- **flake8**
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``flake8`` is a code checking tool. We require code to pass ``flake8`` before being merged into the codebase.
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Install ``flake8`` with::
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pip install --upgrade flake8
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Check all application and test code with::
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flake8 synapse tests
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- **isort**
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``isort`` ensures imports are nicely formatted, and can suggest and
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auto-fix issues such as double-importing.
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Install ``isort`` with::
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pip install --upgrade isort
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Auto-fix imports with::
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isort -rc synapse tests
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``-rc`` means to recursively search the given directories.
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It's worth noting that modern IDEs and text editors can run these tools
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automatically on save. It may be worth looking into whether this
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functionality is supported in your editor for a more convenient development
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workflow. It is not, however, recommended to run ``flake8`` on save as it
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takes a while and is very resource intensive.
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## General rules
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- **Naming**:
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- Use camel case for class and type names
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- Use underscores for functions and variables.
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- Use double quotes ``"foo"`` rather than single quotes ``'foo'``.
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- **Comments**: should follow the `google code style
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<http://google.github.io/styleguide/pyguide.html?showone=Comments#Comments>`_.
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This is so that we can generate documentation with `sphinx
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<http://sphinxcontrib-napoleon.readthedocs.org/en/latest/>`_. See the
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`examples
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<http://sphinxcontrib-napoleon.readthedocs.io/en/latest/example_google.html>`_
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in the sphinx documentation.
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- **Imports**:
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- Prefer to import classes and functions rather than packages or modules.
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Example::
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from synapse.types import UserID
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...
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user_id = UserID(local, server)
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is preferred over::
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from synapse import types
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...
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user_id = types.UserID(local, server)
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(or any other variant).
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This goes against the advice in the Google style guide, but it means that
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errors in the name are caught early (at import time).
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- Multiple imports from the same package can be combined onto one line::
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from synapse.types import GroupID, RoomID, UserID
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An effort should be made to keep the individual imports in alphabetical
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order.
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If the list becomes long, wrap it with parentheses and split it over
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multiple lines.
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- As per `PEP-8 <https://www.python.org/dev/peps/pep-0008/#imports>`_,
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imports should be grouped in the following order, with a blank line between
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each group:
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1. standard library imports
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2. related third party imports
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3. local application/library specific imports
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- Imports within each group should be sorted alphabetically by module name.
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- Avoid wildcard imports (``from synapse.types import *``) and relative
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imports (``from .types import UserID``).
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