presenterm/features/layout.html
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<h1 id="layouts"><a class="header" href="#layouts">Layouts</a></h1>
<p><em>presenterm</em> currently supports a column layout that lets you split parts of your slides into column. This allows you to
put text on one side, and code/images on the other, or really organize markdown into columns in any way you want.</p>
<p>This is done by using commands, just like <code>pause</code> and <code>end_slide</code>, in the form of HTML comments. This section describes
how to use those.</p>
<h2 id="wait-why-not-html"><a class="header" href="#wait-why-not-html">Wait, why not HTML?</a></h2>
<p>While markdown <em>can</em> contain HTML tags (beyond comments!) and we <em>could</em> represent this using divs with alignment, I
don't really want to:</p>
<ol>
<li>Deal with HTML and all the implications this would have. e.g. nesting many divs together and all the chaos that would
bring to the rendering code.</li>
<li>Require people to write HTML when we have such a narrow use-case for it here: we only want column layouts.</li>
</ol>
<p>Because of this, <em>presenterm</em> doesn't let you use HTML and instead has a custom way of specifying column layouts.</p>
<h2 id="column-layout"><a class="header" href="#column-layout">Column layout</a></h2>
<p>The way to specify column layouts is by first creating a layout, and then telling <em>presenterm</em> you want to enter each of
the column in it as you write your presentation.</p>
<h3 id="defining-layouts"><a class="header" href="#defining-layouts">Defining layouts</a></h3>
<p>Defining a layout is done via the <code>column_layout</code> command, in the form of an HTML comment:</p>
<pre><code class="language-html">&lt;!-- column_layout: [3, 2] --&gt;
</code></pre>
<p>This defines a layout with 2 columns where:</p>
<ul>
<li>The total number of "size units" is <code>3 + 2 = 5</code>. You can think of this as the terminal screen being split into 5
pieces vertically.</li>
<li>The first column takes 3 out of those 5 pieces/units, or in other words 60% of the terminal screen.</li>
<li>The second column takes 2 out of those 5 pieces/units, or in other words 40% of the terminal screen.</li>
</ul>
<p>You can use any number of columns and with as many units you want on each of them. This lets you decide how to structure
the presentation in a fairly straightforward way.</p>
<h3 id="using-columns"><a class="header" href="#using-columns">Using columns</a></h3>
<p>Once a layout is defined, you just need to specify that you want to enter a column before writing any text to it by
using the <code>column</code> command:</p>
<pre><code class="language-html">&lt;!-- column: 0 --&gt;
</code></pre>
<p>Now all the markdown you write will be placed on the first column until you either:</p>
<ul>
<li>Reset the layout by using the <code>reset_layout</code> command.</li>
<li>The slide ends.</li>
<li>You jump into another column by using the <code>column</code> command again.</li>
</ul>
<h2 id="example"><a class="header" href="#example">Example</a></h2>
<p>The following example puts all of this together by defining 2 columns, one with some code and bullet points, another one
with an image, and some extra text at the bottom that's not tied to any columns.</p>
<pre><code class="language-markdown">Layout example
==============
&lt;!-- column_layout: [2, 1] --&gt;
&lt;!-- column: 0 --&gt;
This is some code I like:
```rust
fn potato() -&gt; u32 {
42
}
```
Things I like about it:
1. Potato
2. Rust
3. The image on the right
&lt;!-- column: 1 --&gt;
![](examples/doge.png)
_Picture by Alexis Bailey / CC BY-NC 4.0_
&lt;!-- reset_layout --&gt;
Because we just reset the layout, this text is now below both of the columns.
</code></pre>
<p>This would render the following way:</p>
<p><img src="../assets/layouts.png" alt="" /></p>
<h2 id="other-uses"><a class="header" href="#other-uses">Other uses</a></h2>
<p>Besides organizing your slides into columns, you can use column layouts to center a piece of your slide. For example, if
you want a certain portion of your slide to be centered, you could define a column layout like <code>[1, 3, 1]</code> and then only
write content into the middle column. This would make your content take up the center 60% of the screen.</p>
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