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<ol class="chapter"><li class="chapter-item expanded affix "><a href="../../index.html">Introduction</a></li><li class="chapter-item expanded affix "><li class="part-title">User Guide</li><li class="chapter-item expanded "><a href="../../guide/installation.html"><strong aria-hidden="true">1.</strong> Installation</a></li><li class="chapter-item expanded "><a href="../../guide/reading.html"><strong aria-hidden="true">2.</strong> Reading Books</a></li><li class="chapter-item expanded "><a href="../../guide/creating.html"><strong aria-hidden="true">3.</strong> Creating a Book</a></li><li class="chapter-item expanded affix "><li class="part-title">Reference Guide</li><li class="chapter-item expanded "><a href="../../cli/index.html"><strong aria-hidden="true">4.</strong> Command Line Tool</a></li><li><ol class="section"><li class="chapter-item expanded "><a href="../../cli/init.html"><strong aria-hidden="true">4.1.</strong> init</a></li><li class="chapter-item expanded "><a href="../../cli/build.html"><strong aria-hidden="true">4.2.</strong> build</a></li><li class="chapter-item expanded "><a href="../../cli/watch.html"><strong aria-hidden="true">4.3.</strong> watch</a></li><li class="chapter-item expanded "><a href="../../cli/serve.html"><strong aria-hidden="true">4.4.</strong> serve</a></li><li class="chapter-item expanded "><a href="../../cli/test.html"><strong aria-hidden="true">4.5.</strong> test</a></li><li class="chapter-item expanded "><a href="../../cli/clean.html"><strong aria-hidden="true">4.6.</strong> clean</a></li><li class="chapter-item expanded "><a href="../../cli/completions.html"><strong aria-hidden="true">4.7.</strong> completions</a></li></ol></li><li class="chapter-item expanded "><a href="../../format/index.html"><strong aria-hidden="true">5.</strong> Format</a></li><li><ol class="section"><li class="chapter-item expanded "><a href="../../format/summary.html"><strong aria-hidden="true">5.1.</strong> SUMMARY.md</a></li><li><ol class="section"><li class="chapter-item expanded "><div><strong aria-hidden="true">5.1.1.</strong> Draft chapter</div></li></ol></li><li class="chapter-item expanded "><a href="../../format/configuration/index.html"><strong aria-hidden="true">5.2.</strong> Configuration</a></li><li><ol class="section"><li class="chapter-item expanded "><a href="../../format/configuration/general.html"><strong aria-hidden="true">5.2.1.</strong> General</a></li><li class="chapter-item expanded "><a href="../../format/configuration/preprocessors.html" class="active"><strong aria-hidden="true">5.2.2.</strong> Preprocessors</a></li><li class="chapter-item expanded "><a href="../../format/configuration/renderers.html"><strong aria-hidden="true">5.2.3.</strong> Renderers</a></li><li class="chapter-item expanded "><a href="../../format/configuration/environment-variables.html"><strong aria-hidden="true">5.2.4.</strong> Environment Variables</a></li></ol></li><li class="chapter-item expanded "><a href="../../format/theme/index.html"><strong aria-hidden="true">5.3.</strong> Theme</a></li><li><ol class="section"><li class="chapter-item expanded "><a href="../../format/theme/index-hbs.html"><strong aria-hidden="true">5.3.1.</strong> index.hbs</a></li><li class="chapter-item expanded "><a href="../../format/theme/syntax-highlighting.html"><strong aria-hidden="true">5.3.2.</strong> Syntax highlighting</a></li><li class="chapter-item expanded "><a href="../../format/theme/editor.html"><strong aria-hidden="true">5.3.3.</strong> Editor</a></li></ol></li><li class="chapter-item expanded "><a href="../../format/mathjax.html"><strong aria-hidden="true">5.4.</strong> MathJax Support</a></li><li class="chapter-item expanded "><a href="../../format/mdbook.html"><strong aria-hidden="true">5.5.</strong> mdBook-specific features</a></li><li class="chapter-item expanded "><a href="../../format/markdown.html"><strong aria-hidden="true">5.6.</strong> Markdown</a></li></ol></li><li class="chapter-item expanded "><a href="../../continuous-integration.html"><strong aria-hidden="true">6.</strong> Continuous Integr
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<main>
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<h1 id="configuring-preprocessors"><a class="header" href="#configuring-preprocessors">Configuring Preprocessors</a></h1>
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<p>Preprocessors are extensions that can modify the raw Markdown source before it gets sent to the renderer.</p>
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<p>The following preprocessors are built-in and included by default:</p>
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<ul>
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<li><code>links</code>: Expands the <code>{{ #playground }}</code>, <code>{{ #include }}</code>, and <code>{{ #rustdoc_include }}</code> handlebars
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helpers in a chapter to include the contents of a file.
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See <a href="../mdbook.html#including-files">Including files</a> for more.</li>
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<li><code>index</code>: Convert all chapter files named <code>README.md</code> into <code>index.md</code>. That is
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to say, all <code>README.md</code> would be rendered to an index file <code>index.html</code> in the
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rendered book.</li>
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</ul>
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<p>The built-in preprocessors can be disabled with the <a href="general.html#build-options"><code>build.use-default-preprocessors</code></a> config option.</p>
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<p>The community has developed several preprocessors.
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See the <a href="https://github.com/rust-lang/mdBook/wiki/Third-party-plugins">Third Party Plugins</a> wiki page for a list of available preprocessors.</p>
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<p>For information on how to create a new preprocessor, see the <a href="../../for_developers/preprocessors.html">Preprocessors for Developers</a> chapter.</p>
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<h2 id="custom-preprocessor-configuration"><a class="header" href="#custom-preprocessor-configuration">Custom Preprocessor Configuration</a></h2>
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<p>Preprocessors can be added by including a <code>preprocessor</code> table in <code>book.toml</code> with the name of the preprocessor.
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For example, if you have a preprocessor called <code>mdbook-example</code>, then you can include it with:</p>
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<pre><code class="language-toml">[preprocessor.example]
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</code></pre>
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<p>With this table, mdBook will execute the <code>mdbook-example</code> preprocessor.</p>
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<p>This table can include additional key-value pairs that are specific to the preprocessor.
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For example, if our example preprocessor needed some extra configuration options:</p>
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<pre><code class="language-toml">[preprocessor.example]
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some-extra-feature = true
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</code></pre>
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<h2 id="locking-a-preprocessor-dependency-to-a-renderer"><a class="header" href="#locking-a-preprocessor-dependency-to-a-renderer">Locking a Preprocessor dependency to a renderer</a></h2>
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<p>You can explicitly specify that a preprocessor should run for a renderer by
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binding the two together.</p>
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<pre><code class="language-toml">[preprocessor.example]
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renderers = ["html"] # example preprocessor only runs with the HTML renderer
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</code></pre>
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<h2 id="provide-your-own-command"><a class="header" href="#provide-your-own-command">Provide Your Own Command</a></h2>
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<p>By default when you add a <code>[preprocessor.foo]</code> table to your <code>book.toml</code> file,
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<code>mdbook</code> will try to invoke the <code>mdbook-foo</code> executable. If you want to use a
|
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different program name or pass in command-line arguments, this behaviour can
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be overridden by adding a <code>command</code> field.</p>
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<pre><code class="language-toml">[preprocessor.random]
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command = "python random.py"
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</code></pre>
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<h2 id="require-a-certain-order"><a class="header" href="#require-a-certain-order">Require A Certain Order</a></h2>
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<p>The order in which preprocessors are run can be controlled with the <code>before</code> and <code>after</code> fields.
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For example, suppose you want your <code>linenos</code> preprocessor to process lines that may have been <code>{{#include}}</code>d; then you want it to run after the built-in <code>links</code> preprocessor, which you can require using either the <code>before</code> or <code>after</code> field:</p>
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<pre><code class="language-toml">[preprocessor.linenos]
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after = [ "links" ]
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</code></pre>
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<p>or</p>
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<pre><code class="language-toml">[preprocessor.links]
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before = [ "linenos" ]
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</code></pre>
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<p>It would also be possible, though redundant, to specify both of the above in the same config file.</p>
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<p>Preprocessors having the same priority specified through <code>before</code> and <code>after</code> are sorted by name.
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Any infinite loops will be detected and produce an error.</p>
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