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<a class="text-sm external-link" href="https://youwen.dev"
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><em>by </em>Youwen Wu</a
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<h1 class="text-4xl">
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<a href="./why-i-made-my-blog-in-haskell.html">why I made my blog in haskell</a>
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</h1>
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class="mb-1 mt-2 italic font-light text-lg text-accent-light dark:text-accent-dark"
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>
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a purely functional...blog?
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</p>
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<div class="mt-2">2024-05-25</div>
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<div class="mt-1 text-sm">
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(last updated: 2024-05-25T12:00:00Z)
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</div>
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</header>
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<main class="post mt-4"><p>Welcome! This is the first post on <em>gradient ascent</em> and also one that tests all
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of the features.</p>
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<p><img
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alt="gradient ascent"
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src="./images/gradient-ascent.jpg"
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style="height: 200px; width: 100%; object-fit: cover"
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/></p>
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<p>I’ll be writing about computers, code, math, video games, and whatever else
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here.</p>
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<blockquote>
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<p>A monad is just a monoid in the category of endofunctors, what’s the problem?</p>
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</blockquote>
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<h2 id="haskell">haskell?</h2>
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<p>This entire blog is generated with <a href="https://jaspervdj.be/hakyll/">hakyll</a>. It’s
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a library for generating static sites for Haskell, a purely functional
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programming language. It’s a <em>library</em> because it doesn’t come with as many
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batteries included as tools like Hugo or Astro. You set up most of the site
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yourself by calling the library from Haskell.</p>
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<p>Here’s a brief excerpt:</p>
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<div class="sourceCode" id="cb1"><pre class="sourceCode haskell"><code class="sourceCode haskell"><span id="cb1-1"><a href="#cb1-1" aria-hidden="true" tabindex="-1"></a><span class="ot">main ::</span> <span class="dt">IO</span> ()</span>
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<span id="cb1-2"><a href="#cb1-2" aria-hidden="true" tabindex="-1"></a>main <span class="ot">=</span> hakyllWith config <span class="op">$</span> <span class="kw">do</span></span>
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<span id="cb1-3"><a href="#cb1-3" aria-hidden="true" tabindex="-1"></a> forM_</span>
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<span id="cb1-4"><a href="#cb1-4" aria-hidden="true" tabindex="-1"></a> [ <span class="st">"CNAME"</span></span>
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<span id="cb1-5"><a href="#cb1-5" aria-hidden="true" tabindex="-1"></a> , <span class="st">"favicon.ico"</span></span>
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<span id="cb1-6"><a href="#cb1-6" aria-hidden="true" tabindex="-1"></a> , <span class="st">"robots.txt"</span></span>
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<span id="cb1-7"><a href="#cb1-7" aria-hidden="true" tabindex="-1"></a> , <span class="st">"_config.yml"</span></span>
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<span id="cb1-8"><a href="#cb1-8" aria-hidden="true" tabindex="-1"></a> , <span class="st">"images/*"</span></span>
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<span id="cb1-9"><a href="#cb1-9" aria-hidden="true" tabindex="-1"></a> , <span class="st">"out/*"</span></span>
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<span id="cb1-10"><a href="#cb1-10" aria-hidden="true" tabindex="-1"></a> , <span class="st">"fonts/*"</span></span>
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<span id="cb1-11"><a href="#cb1-11" aria-hidden="true" tabindex="-1"></a> ]</span>
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<span id="cb1-12"><a href="#cb1-12" aria-hidden="true" tabindex="-1"></a> <span class="op">$</span> \f <span class="ot">-></span> match f <span class="op">$</span> <span class="kw">do</span></span>
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<span id="cb1-13"><a href="#cb1-13" aria-hidden="true" tabindex="-1"></a> route idRoute</span>
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<span id="cb1-14"><a href="#cb1-14" aria-hidden="true" tabindex="-1"></a> compile copyFileCompiler</span></code></pre></div>
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<p>The code highlighting is also generated by hakyll.</p>
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<hr />
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<h2 id="why">why?</h2>
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<p>Haskell is a purely functional language with no mutable state. Its syntax
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actually makes it pretty elegant for declaring routes and “rendering” pipelines.</p>
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<p>I originally wanted to build this entire blog myself. I had a working version
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with the Svelte framework, complete with GFM rendering, table of contents, KaTeX
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math, code highlighting, static generation, and other goodies. However, it
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seemed like a little too much work to maintain. I switched to hakyll because</p>
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<ol>
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<li>Haskell is cool.</li>
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<li>It comes with enough features that I don’t feel like I have to build
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everything from scratch.</li>
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<li>It comes with Pandoc, a Haskell library for converting between markdown
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formats. It’s probably more powerful than anything you could do in <code>nodejs</code>.
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It renders all of the markdown to HTML as well as the math.
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<ol>
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<li>It supports KaTeX as well as MathML. I’m a little disappointed with the
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KaTeX though. It doesn’t directly render it, but simply injects the KaTeX
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files and renders it client-side.</li>
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</ol></li>
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</ol>
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<h3 id="speaking-of-math">speaking of math</h3>
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<p>We can have math inline, like so:
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<math display="inline" xmlns="http://www.w3.org/1998/Math/MathML"><semantics><mrow><msubsup><mo>∫</mo><mi>∞</mi><mi>∞</mi></msubsup><mspace width="0.167em"></mspace><msup><mi>e</mi><mrow><mo>−</mo><msup><mi>x</mi><mn>2</mn></msup></mrow></msup><mspace width="0.167em"></mspace><mi>d</mi><mi>x</mi><mo>=</mo><msqrt><mi>π</mi></msqrt></mrow><annotation encoding="application/x-tex">\int_\infty^\infty \, e^{-x^2}\,dx = \sqrt{\pi}</annotation></semantics></math>. This site ships semantic
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MathML math with its HTML, and the MathJax script to the client.</p>
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<p>It’d be nice if MathML could just be used and supported across all browsers, but
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unfortunately we still aren’t quite there yet. Firefox is the only one where
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everything looks 80% of the way to LaTeX. On Safari and Chrome, even simple
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equations like <math display="inline" xmlns="http://www.w3.org/1998/Math/MathML"><semantics><msqrt><mi>π</mi></msqrt><annotation encoding="application/x-tex">\sqrt{\pi}</annotation></semantics></math> render improperly.</p>
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<p>Pros of MathML:</p>
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<ul>
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<li>A little more accessible</li>
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<li>Can be rendered without additional stylesheets. I just installed the Latin
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Modern font, but this isn’t even really necessary</li>
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<li>Built-in to most browsers (#UseThePlatform)</li>
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</ul>
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<p>Cons:</p>
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<ul>
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<li>Isn’t fully standardized. Might look different on different browsers</li>
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<li>Rendering quality isn’t as good as KaTeX</li>
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</ul>
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<p>This site has MathJax render all of the math so it looks nice and standardized
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across browsers, but the math still displays regardless (like say if MathJax
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couldn’t load due to slow network) because of MathML. Best of both worlds.</p>
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<p>Let’s try it now. Here’s a simple theorem:</p>
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<p><math display="block" xmlns="http://www.w3.org/1998/Math/MathML"><semantics><mrow><msup><mi>a</mi><mi>n</mi></msup><mo>+</mo><msup><mi>b</mi><mi>n</mi></msup><mo>≠</mo><msup><mi>c</mi><mi>n</mi></msup><mspace width="0.167em"></mspace><mo>∀</mo><mspace width="0.167em"></mspace><mrow><mo stretchy="true" form="prefix">{</mo><mi>a</mi><mo>,</mo><mspace width="0.167em"></mspace><mi>b</mi><mo>,</mo><mspace width="0.167em"></mspace><mi>c</mi><mo stretchy="true" form="postfix">}</mo></mrow><mo>∈</mo><mstyle mathvariant="double-struck"><mi>ℤ</mi></mstyle><mo>∧</mo><mi>n</mi><mo>≥</mo><mn>3</mn></mrow><annotation encoding="application/x-tex">
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a^n + b^n \ne c^n \, \forall\,\left\{ a,\,b,\,c \right\} \in \mathbb{Z} \land n \ge 3
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</annotation></semantics></math></p>
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<p>The proof is trivial and will be left as an exercise to the reader.</p>
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<h2 id="seems-a-little-overengineered">seems a little overengineered</h2>
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<p>Probably is. Not as much as the old one, though.</p></main>
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© 2024 Youwen Wu. Generated by
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>Hakyll.</a
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View the source
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class="external-link"
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target="__blank"
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>on GitHub.</a
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<p class="text-sm leading-relaxed mt-2">
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Content freely available under
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