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    <h1>Contributing to Fandango</h1>
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  <section class="tex2jax_ignore mathjax_ignore" id="contributing-to-fandango">
<span id="sec-contributing"></span><h1>Contributing to Fandango<a class="headerlink" href="#contributing-to-fandango" title="Link to this heading">#</a></h1>
<p>Welcome!
Fandango is a community project that aims to work for a wide
range of developers.
If you’re trying out Fandango, your experience and what you can contribute are
important to the project’s success.</p>
<section id="code-of-conduct">
<span id="sec-code-of-conduct"></span><h2>Code of Conduct<a class="headerlink" href="#code-of-conduct" title="Link to this heading">#</a></h2>
<p>Everyone participating in Fandango, and in particular in our
issue tracker, pull requests, and chat, is expected to treat
other people with respect and more generally to follow the guidelines
articulated in the <a class="reference external" href="https://www.python.org/psf/codeofconduct/">Python Community Code of Conduct</a>.</p>
</section>
<section id="getting-started-with-development">
<span id="sec-getting-started-with-development"></span><h2>Getting Started with Development<a class="headerlink" href="#getting-started-with-development" title="Link to this heading">#</a></h2>
<section id="step-1-fork-the-fandango-repository">
<h3>Step 1: Fork the Fandango repository<a class="headerlink" href="#step-1-fork-the-fandango-repository" title="Link to this heading">#</a></h3>
<p>Within GitHub, navigate to the <a class="reference external" href="https://github.com/fandango-fuzzer/fandango">Fandango GitHub repository</a> and fork the repository.</p>
</section>
<section id="step-2-clone-the-fandango-repository-and-enter-into-it">
<h3>Step 2: Clone the Fandango repository and enter into it<a class="headerlink" href="#step-2-clone-the-fandango-repository-and-enter-into-it" title="Link to this heading">#</a></h3>
<div class="highlight-shell notranslate"><div class="highlight"><pre><span></span>$<span class="w"> </span>git<span class="w"> </span>clone<span class="w"> </span>https://github.com/fandango-fuzzer/fandango.git
</pre></div>
</div>
<div class="highlight-shell notranslate"><div class="highlight"><pre><span></span>$<span class="w"> </span><span class="nb">cd</span><span class="w"> </span>fandango
</pre></div>
</div>
</section>
<section id="step-3-create-then-activate-a-virtual-environment">
<h3>Step 3: Create, then activate a virtual environment<a class="headerlink" href="#step-3-create-then-activate-a-virtual-environment" title="Link to this heading">#</a></h3>
<div class="highlight-shell notranslate"><div class="highlight"><pre><span></span>$<span class="w"> </span>python3<span class="w"> </span>-m<span class="w"> </span>venv<span class="w"> </span>venv
</pre></div>
</div>
<div class="highlight-shell notranslate"><div class="highlight"><pre><span></span>$<span class="w"> </span><span class="nb">source</span><span class="w"> </span>venv/bin/activate
</pre></div>
</div>
<p>For Windows, use</p>
<div class="highlight-shell notranslate"><div class="highlight"><pre><span></span>$<span class="w"> </span>python<span class="w"> </span>-m<span class="w"> </span>venv<span class="w"> </span>venv
</pre></div>
</div>
<div class="highlight-shell notranslate"><div class="highlight"><pre><span></span>$<span class="w"> </span>.<span class="w"> </span>venv/Scripts/activate
</pre></div>
</div>
<p>For more details, see <a class="reference external" href="https://docs.python.org/3/library/venv.html#creating-virtual-environments">https://docs.python.org/3/library/venv.html#creating-virtual-environments</a></p>
</section>
<section id="step-4-install-development-tools">
<h3>Step 4: Install development tools<a class="headerlink" href="#step-4-install-development-tools" title="Link to this heading">#</a></h3>
<p>Install <code class="docutils literal notranslate"><span class="pre">antlr</span></code> and other system-level tools:</p>
<div class="highlight-shell notranslate"><div class="highlight"><pre><span></span>$<span class="w"> </span>make<span class="w"> </span>system-dev-tools
</pre></div>
</div>
</section>
<section id="step-5-install-fandango">
<span id="sec-pip-install"></span><h3>Step 5: Install Fandango<a class="headerlink" href="#step-5-install-fandango" title="Link to this heading">#</a></h3>
<p>Install your local copy of Fandango:</p>
<div class="highlight-shell notranslate"><div class="highlight"><pre><span></span>$<span class="w"> </span>python<span class="w"> </span>-m<span class="w"> </span>pip<span class="w"> </span>install<span class="w"> </span>-e<span class="w"> </span>.
</pre></div>
</div>
<p>To install additional dependencies for unit tests, code checks, running the evaluation, and building the Fandango book, install Fandango like this (or with the subsection of dependencies you need):</p>
<div class="highlight-shell notranslate"><div class="highlight"><pre><span></span>$<span class="w"> </span>python<span class="w"> </span>-m<span class="w"> </span>pip<span class="w"> </span>install<span class="w"> </span>-e<span class="w"> </span><span class="s2">&quot;.[test,development,evaluation,book]&quot;</span>
</pre></div>
</div>
<p>If you don’t need the (much faster) C++ parser, build Fandango without:</p>
<div class="highlight-shell notranslate"><div class="highlight"><pre><span></span>$<span class="w"> </span><span class="nv">FANDANGO_SKIP_CPP_PARSER</span><span class="o">=</span><span class="m">1</span><span class="w"> </span>python<span class="w"> </span>-m<span class="w"> </span>pip<span class="w"> </span>install<span class="w"> </span>-e<span class="w"> </span>.
</pre></div>
</div>
<p>Reset the shell PATH cache (not necessary on Windows):</p>
<div class="highlight-shell notranslate"><div class="highlight"><pre><span></span>$<span class="w"> </span><span class="nb">hash</span><span class="w"> </span>-r
</pre></div>
</div>
<p>That’s it! You just have installed your personal copy of Fandango.
You can invoke it as <code class="docutils literal notranslate"><span class="pre">fandango</span></code> and can alter its code as you like.</p>
</section>
</section>
<section id="running-tests">
<span id="sec-running-tests"></span><h2>Running Tests<a class="headerlink" href="#running-tests" title="Link to this heading">#</a></h2>
<p>Running the full test suite can take a while, and usually is not necessary when
preparing a pull request.
Once you file a pull request, the full test suite will run on GitHub.
You’ll then be able to see any test failures, and make any necessary changes to
your pull request.</p>
<p>However, if you wish to do so, you can run the full test suite
like this:</p>
<div class="highlight-shell notranslate"><div class="highlight"><pre><span></span>$<span class="w"> </span>make<span class="w"> </span>tests
</pre></div>
</div>
<p>or simply</p>
<div class="highlight-shell notranslate"><div class="highlight"><pre><span></span>$<span class="w"> </span>pytest
</pre></div>
</div>
<p>To run tests in parallel, you can use <a class="reference external" href="https://pytest-xdist.readthedocs.io/en/stable/">pytest-xdist</a> (installed with the <code class="docutils literal notranslate"><span class="pre">test</span></code> depenendencies):</p>
<div class="highlight-shell notranslate"><div class="highlight"><pre><span></span>$<span class="w"> </span>pytest<span class="w"> </span>-n<span class="w"> </span>auto
</pre></div>
</div>
<section id="pre-commit">
<h3>Pre-commit<a class="headerlink" href="#pre-commit" title="Link to this heading">#</a></h3>
<p>Fandango provides a config file for <code class="docutils literal notranslate"><span class="pre">pre-commit</span></code>. To install it, run the following:</p>
<div class="highlight-shell notranslate"><div class="highlight"><pre><span></span>$<span class="w"> </span>pip<span class="w"> </span>install<span class="w"> </span>pre-commit
$<span class="w"> </span>pre-commit<span class="w"> </span>install
</pre></div>
</div>
<p>This will run code formatting and type checking before every commit.</p>
<div class="admonition warning">
<p class="admonition-title">Warning</p>
<p>The <a class="reference internal" href="#sec-running-tests"><span class="std std-ref">tests</span></a>= aren’t run as part of pre-commit, because they take significant time to complete. Run them manually.</p>
</div>
</section>
</section>
<section id="first-time-contributors">
<span id="sec-first-time-contributors"></span><h2>First Time Contributors<a class="headerlink" href="#first-time-contributors" title="Link to this heading">#</a></h2>
<p>If you’re looking for things to help with, browse our <a class="reference external" href="https://github.com/fandango-fuzzer/fandango/issues">issue tracker</a>!</p>
<p>You do not need to ask for permission to work on any of these issues.
Just fix the issue yourself, <a class="reference internal" href="#sec-running-tests"><span class="std std-ref">try to add a unit test</span></a> and open a pull request.</p>
<p>To get help fixing a specific issue, it’s often best to comment on the issue itself.
You’re much more likely to get help if you provide details about what you’ve tried and where you’ve looked (maintainers tend to help those who help themselves).</p>
</section>
<section id="contributing-code">
<span id="sec-contributing-code"></span><h2>Contributing Code<a class="headerlink" href="#contributing-code" title="Link to this heading">#</a></h2>
<p>Even more excellent than a good bug report is a fix for a bug, or the implementation of a much-needed new feature.
We’d love to have your contributions.</p>
<p>We use the usual GitHub pull-request flow, which may be familiar to you if you’ve contributed to other projects on GitHub.
For the mechanics, see <a class="reference external" href="https://help.github.com/articles/using-pull-requests/">GitHub’s own documentation</a>.</p>
<p>Anyone interested in Fandango may review your code.
One of the Fandango core developers will merge your pull request when they think it’s ready.</p>
<p>If your change will be a significant amount of work to write, we highly recommend starting by opening an issue laying out
what you want to do.
That lets a conversation happen early in case other contributors disagree with what you’d like to do or have ideas that will help you do it.</p>
<p>The best pull requests are focused, clearly describe what they’re for and why they’re correct, and contain tests for whatever changes they make to the code’s behavior.
As a bonus these are easiest for someone to review, which helps your pull request get merged quickly!
Standard advice about good pull requests for open-source projects applies.</p>
<section id="changing-parser-files">
<h3>Changing Parser Files<a class="headerlink" href="#changing-parser-files" title="Link to this heading">#</a></h3>
<p>If your contribution involves changing the ANTLR <code class="docutils literal notranslate"><span class="pre">.g4</span></code> parser files,
you need to <em>regenerate</em> and <em>recompile</em> the parser code.
For this, you need a C++ compiler such as <code class="docutils literal notranslate"><span class="pre">clang</span></code>.</p>
<section id="step-1-generate-the-parser-code">
<h4>Step 1: Generate the parser code<a class="headerlink" href="#step-1-generate-the-parser-code" title="Link to this heading">#</a></h4>
<p>To (re)generate the parser code, use</p>
<div class="highlight-shell notranslate"><div class="highlight"><pre><span></span>$<span class="w"> </span>make<span class="w"> </span>parser
</pre></div>
</div>
</section>
<section id="step-2-compile-the-parser-code">
<h4>Step 2: Compile the parser code<a class="headerlink" href="#step-2-compile-the-parser-code" title="Link to this heading">#</a></h4>
<p>The <code class="docutils literal notranslate"><span class="pre">pip</span></code> command takes care of (re)compiling the parser code.
Simply <a class="reference internal" href="#sec-pip-install"><span class="std std-ref">reinstall Fandango</span></a>.</p>
<div class="admonition note">
<p class="admonition-title">Note</p>
<p>If compiling the C++ code for parsing fails,
Fandango uses (slower) Python code instead.</p>
</div>
</section>
</section>
<section id="contributing-to-documentation">
<h3>Contributing to Documentation<a class="headerlink" href="#contributing-to-documentation" title="Link to this heading">#</a></h3>
<p>If you want to contribute to this very tutorial and reference, be sure to preview your changes.
Use</p>
<div class="highlight-shell notranslate"><div class="highlight"><pre><span></span>$<span class="w"> </span>make<span class="w"> </span>html
</pre></div>
</div>
<p>to create a HTML version of the documentation in <code class="docutils literal notranslate"><span class="pre">docs/_build/html</span></code>.</p>
</section>
</section>
<section id="attributions">
<h2>Attributions<a class="headerlink" href="#attributions" title="Link to this heading">#</a></h2>
<p>This guide was forked from the <a class="reference external" href="https://github.com/python/mypy/blob/master/CONTRIBUTING.md">mypy contribution guide</a>, which is licensed under the terms of the MIT license.</p>
</section>
</section>

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<li class="toc-h2 nav-item toc-entry"><a class="reference internal nav-link" href="#code-of-conduct">Code of Conduct</a></li>
<li class="toc-h2 nav-item toc-entry"><a class="reference internal nav-link" href="#getting-started-with-development">Getting Started with Development</a><ul class="nav section-nav flex-column">
<li class="toc-h3 nav-item toc-entry"><a class="reference internal nav-link" href="#step-1-fork-the-fandango-repository">Step 1: Fork the Fandango repository</a></li>
<li class="toc-h3 nav-item toc-entry"><a class="reference internal nav-link" href="#step-2-clone-the-fandango-repository-and-enter-into-it">Step 2: Clone the Fandango repository and enter into it</a></li>
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<li class="toc-h3 nav-item toc-entry"><a class="reference internal nav-link" href="#step-5-install-fandango">Step 5: Install Fandango</a></li>
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<li class="toc-h4 nav-item toc-entry"><a class="reference internal nav-link" href="#step-1-generate-the-parser-code">Step 1: Generate the parser code</a></li>
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