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376 lines
29 KiB
HTML
376 lines
29 KiB
HTML
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<main>
|
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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
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||
quickly and automatically check for formatting (and sometimes logical)
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||
errors in code.</p>
|
||
<p>The necessary tools are:</p>
|
||
<ul>
|
||
<li><a href="https://github.com/charliermarsh/ruff">ruff</a>, which can spot common errors and enforce a consistent style; and</li>
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||
<li><a href="https://mypy.readthedocs.io/en/stable/">mypy</a>, a type checker.</li>
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||
</ul>
|
||
<p>See <a href="development/contributing_guide.html#run-the-linters">the contributing guide</a> for instructions
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on how to install the above tools and run the linters.</p>
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||
<p>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
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development workflow. It is not, however, recommended to run <code>mypy</code>
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on save as it takes a while and can be very resource intensive.</p>
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<h2 id="general-rules"><a class="header" href="#general-rules">General rules</a></h2>
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<ul>
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<li><strong>Naming</strong>:
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<ul>
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<li>Use <code>CamelCase</code> for class and type names</li>
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<li>Use underscores for <code>function_names</code> and <code>variable_names</code>.</li>
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</ul>
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||
</li>
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||
<li><strong>Docstrings</strong>: should follow the <a href="https://google.github.io/styleguide/pyguide.html#38-comments-and-docstrings">google code
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style</a>.
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See the
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<a href="http://sphinxcontrib-napoleon.readthedocs.io/en/latest/example_google.html">examples</a>
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in the sphinx documentation.</li>
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<li><strong>Imports</strong>:
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<ul>
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<li>
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<p>Imports should be sorted by <code>isort</code> as described above.</p>
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</li>
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<li>
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<p>Prefer to import classes and functions rather than packages or
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modules.</p>
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<p>Example:</p>
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<pre><code class="language-python">from synapse.types import UserID
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...
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user_id = UserID(local, server)
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</code></pre>
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<p>is preferred over:</p>
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||
<pre><code class="language-python">from synapse import types
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...
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user_id = types.UserID(local, server)
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</code></pre>
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<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-code-and-documentation-format"><a class="header" href="#configuration-code-and-documentation-format">Configuration code and documentation format</a></h2>
|
||
<p>When adding a configuration option to the code, if several settings are grouped into a single dict, 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>
|
||
<p>The <a href="usage/configuration/config_documentation.html">configuration manual</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 it is important that when you add
|
||
a configuration option the documentation be as easy to understand as possible, which
|
||
includes following a consistent format.</p>
|
||
<p>Some guidelines follow:</p>
|
||
<ul>
|
||
<li>
|
||
<p>Each option should be listed in the config manual with the following format:</p>
|
||
<ul>
|
||
<li>
|
||
<p>The name of the option, prefixed by <code>###</code>.</p>
|
||
</li>
|
||
<li>
|
||
<p>A comment which describes the default behaviour (i.e. what
|
||
happens if the setting is omitted), as well as what the effect
|
||
will be if the setting is changed.</p>
|
||
</li>
|
||
<li>
|
||
<p>An example setting, using backticks to define the code block</p>
|
||
<p>For boolean (on/off) options, convention is that this example
|
||
should be the <em>opposite</em> to the default. 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 horizontal rule between each option, which can be achieved by adding <code>---</code> before and
|
||
after the option.</p>
|
||
</li>
|
||
<li>
|
||
<p><code>true</code> and <code>false</code> are spelt thus (as opposed to <code>True</code>, etc.)</p>
|
||
</li>
|
||
</ul>
|
||
<p>Example:</p>
|
||
<hr>
|
||
<h3 id="modules"><a class="header" href="#modules"><code>modules</code></a></h3>
|
||
<p>Use the <code>module</code> sub-option to add a module under <code>modules</code> to extend functionality.
|
||
The <code>module</code> setting then has a sub-option, <code>config</code>, which can be used to define some configuration
|
||
for the <code>module</code>.</p>
|
||
<p>Defaults to none.</p>
|
||
<p>Example configuration:</p>
|
||
<pre><code class="language-yaml">modules:
|
||
- module: my_super_module.MySuperClass
|
||
config:
|
||
do_thing: true
|
||
- module: my_other_super_module.SomeClass
|
||
config: {}
|
||
</code></pre>
|
||
<hr>
|
||
<p>Note that the sample configuration is generated from the synapse code
|
||
and is maintained by a script, <code>scripts-dev/generate_sample_config.sh</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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|
||
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