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- <h1 id="code-style"><a class="header" href="#code-style">Code Style</a></h1>
-<h2 id="formatting-tools"><a class="header" href="#formatting-tools">Formatting tools</a></h2>
-<p>The Synapse codebase uses a number of code formatting tools in order to
-quickly and automatically check for formatting (and sometimes logical)
-errors in code.</p>
-<p>The necessary tools are detailed below.</p>
-<p>First install them with:</p>
-<pre><code>pip install -e ".[lint,mypy]"
-</code></pre>
-<ul>
-<li>
-<p><strong>black</strong></p>
-<p>The Synapse codebase uses <a href="https://pypi.org/project/black/">black</a>
-as an opinionated code formatter, ensuring all comitted code is
-properly formatted.</p>
-<p>Have <code>black</code> auto-format your code (it shouldn't change any
-functionality) with:</p>
-<pre><code>black . --exclude="\.tox|build|env"
-</code></pre>
-</li>
-<li>
-<p><strong>flake8</strong></p>
-<p><code>flake8</code> is a code checking tool. We require code to pass <code>flake8</code>
-before being merged into the codebase.</p>
-<p>Check all application and test code with:</p>
-<pre><code>flake8 synapse tests
-</code></pre>
-</li>
-<li>
-<p><strong>isort</strong></p>
-<p><code>isort</code> ensures imports are nicely formatted, and can suggest and
-auto-fix issues such as double-importing.</p>
-<p>Auto-fix imports with:</p>
-<pre><code>isort -rc synapse tests
-</code></pre>
-<p><code>-rc</code> means to recursively search the given directories.</p>
-</li>
-</ul>
-<p>It's worth noting that modern IDEs and text editors can run these tools
-automatically on save. It may be worth looking into whether this
-functionality is supported in your editor for a more convenient
-development workflow. It is not, however, recommended to run <code>flake8</code> on
-save as it takes a while and is very resource intensive.</p>
-<h2 id="general-rules"><a class="header" href="#general-rules">General rules</a></h2>
-<ul>
-<li><strong>Naming</strong>:
-<ul>
-<li>Use camel case for class and type names</li>
-<li>Use underscores for functions and variables.</li>
-</ul>
-</li>
-<li><strong>Docstrings</strong>: should follow the <a href="https://google.github.io/styleguide/pyguide.html#38-comments-and-docstrings">google code
-style</a>.
-See the
-<a href="http://sphinxcontrib-napoleon.readthedocs.io/en/latest/example_google.html">examples</a>
-in the sphinx documentation.</li>
-<li><strong>Imports</strong>:
-<ul>
-<li>
-<p>Imports should be sorted by <code>isort</code> as described above.</p>
-</li>
-<li>
-<p>Prefer to import classes and functions rather than packages or
-modules.</p>
-<p>Example:</p>
-<pre><code>from synapse.types import UserID
-...
-user_id = UserID(local, server)
-</code></pre>
-<p>is preferred over:</p>
-<pre><code>from synapse import types
-...
-user_id = types.UserID(local, server)
-</code></pre>
-<p>(or any other variant).</p>
-<p>This goes against the advice in the Google style guide, but it
-means that errors in the name are caught early (at import time).</p>
-</li>
-<li>
-<p>Avoid wildcard imports (<code>from synapse.types import *</code>) and
-relative imports (<code>from .types import UserID</code>).</p>
-</li>
-</ul>
-</li>
-</ul>
-<h2 id="configuration-file-format"><a class="header" href="#configuration-file-format">Configuration file format</a></h2>
-<p>The <a href="./sample_config.yaml">sample configuration file</a> acts as a
-reference to Synapse's configuration options for server administrators.
-Remember that many readers will be unfamiliar with YAML and server
-administration in general, so that it is important that the file be as
-easy to understand as possible, which includes following a consistent
-format.</p>
-<p>Some guidelines follow:</p>
-<ul>
-<li>
-<p>Sections should be separated with a heading consisting of a single
-line prefixed and suffixed with <code>##</code>. There should be <strong>two</strong> blank
-lines before the section header, and <strong>one</strong> after.</p>
-</li>
-<li>
-<p>Each option should be listed in the file with the following format:</p>
-<ul>
-<li>
-<p>A comment describing the setting. Each line of this comment
-should be prefixed with a hash (<code>#</code>) and a space.</p>
-<p>The comment should describe the default behaviour (ie, what
-happens if the setting is omitted), as well as what the effect
-will be if the setting is changed.</p>
-<p>Often, the comment end with something like "uncomment the
-following to <do action>".</p>
-</li>
-<li>
-<p>A line consisting of only <code>#</code>.</p>
-</li>
-<li>
-<p>A commented-out example setting, prefixed with only <code>#</code>.</p>
-<p>For boolean (on/off) options, convention is that this example
-should be the <em>opposite</em> to the default (so the comment will end
-with "Uncomment the following to enable [or disable]
-<feature>." For other options, the example should give some
-non-default value which is likely to be useful to the reader.</p>
-</li>
-</ul>
-</li>
-<li>
-<p>There should be a blank line between each option.</p>
-</li>
-<li>
-<p>Where several settings are grouped into a single dict, <em>avoid</em> the
-convention where the whole block is commented out, resulting in
-comment lines starting <code># #</code>, as this is hard to read and confusing
-to edit. Instead, leave the top-level config option uncommented, and
-follow the conventions above for sub-options. Ensure that your code
-correctly handles the top-level option being set to <code>None</code> (as it
-will be if no sub-options are enabled).</p>
-</li>
-<li>
-<p>Lines should be wrapped at 80 characters.</p>
-</li>
-<li>
-<p>Use two-space indents.</p>
-</li>
-<li>
-<p><code>true</code> and <code>false</code> are spelt thus (as opposed to <code>True</code>, etc.)</p>
-</li>
-<li>
-<p>Use single quotes (<code>'</code>) rather than double-quotes (<code>"</code>) or backticks
-(<code>`</code>) to refer to configuration options.</p>
-</li>
-</ul>
-<p>Example:</p>
-<pre><code>## Frobnication ##
-
-# The frobnicator will ensure that all requests are fully frobnicated.
-# To enable it, uncomment the following.
-#
-#frobnicator_enabled: true
-
-# By default, the frobnicator will frobnicate with the default frobber.
-# The following will make it use an alternative frobber.
-#
-#frobincator_frobber: special_frobber
-
-# Settings for the frobber
-#
-frobber:
- # frobbing speed. Defaults to 1.
- #
- #speed: 10
-
- # frobbing distance. Defaults to 1000.
- #
- #distance: 100
-</code></pre>
-<p>Note that the sample configuration is generated from the synapse code
-and is maintained by a script, <code>scripts-dev/generate_sample_config</code>.
-Making sure that the output from this script matches the desired format
-is left as an exercise for the reader!</p>
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