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<h1>Markdown Examples in barf</h1>
<p>2023-01-05</p>
<p>This following was lifted from <a href="https://github.com/karlb/smu">https://github.com/karlb/smu</a></p>
<h1><code>smu</code> Syntax</h1>
<p>smu was started as a rewrite of
<a href="http://daringfireball.net/projects/markdown/">markdown</a> but became something
more lightweight and consistent. It differs from <a href="https://commonmark.org/">CommonMark</a> in the following ways:</p>
<ul>
<li>No support for <em>reference style links</em></li>
<li>Stricter indentation rules for lists</li>
<li>Lists don't end paragraphs by themselves (blank line needed)</li>
<li>Horizontal rules (<code><hr></code>) must use <code>- - -</code> as syntax</li>
<li>Code fences have stricter syntax</li>
</ul>
<p>Patches that increase the CommonMark compatibility are welcome as long as they don't increase the code complexity significantly.</p>
<p>This project is a fork of the <a href="https://github.com/gottox/smu">original smu</a> by
<a href="https://eboland.de">Enno Boland (gottox)</a>. The main differences to the
original smu are:</p>
<ul>
<li>Support for code fences</li>
<li>Improved <a href="https://commonmark.org/">CommonMark</a> compatibility. E.g.
<ul>
<li>Code blocks need four spaces indentation instead of three</li>
<li>Skip empty lines at end of code blocks</li>
<li>Ignore single spaces around code spans</li>
<li>Keep HTML comments in output</li>
<li>Improved spec compliance for lists</li>
<li>Nesting code block in blockquotes works</li>
<li>"Empty" lines in lists behave identically, no matter how much whitespace they contain</li>
<li>No backslash escapes in code blocks</li>
<li>Use first number as start number for ordered lists</li>
</ul>
</li>
<li>Added a simple test suite to check for compliance and avoid regressions</li>
</ul>
<h2>Inline patterns</h2>
<p>There are several patterns you can use to highlight your text:</p>
<ul>
<li><p>Emphasis</p>
<ul>
<li>Surround your text with <code>*</code> or <code>_</code> to get <em>emphasised</em> text:
<pre><code>This *is* cool.
This _is_ cool, too.
</code></pre>
</li>
<li>Surround your text with <code>**</code> or <code>__</code> to get <strong>strong</strong> text:
<pre><code>This **is** cool.
This __is__ cool, too.
</code></pre>
</li>
<li>Surround your text with <code>***</code> or <code>___</code> to get <strong><em>strong and emphasised</em></strong> text:
<pre><code>This ***is*** cool.
This ___is___ cool, too.
</code></pre>
</li>
<li>But this example won't work as expected:
<pre><code>***Hello** you*
</code></pre>
<p>This is a wontfix bug because it would make the source too complex.
Use this instead:
</p>
<pre><code>***Hello*** *you*
</code></pre>
</li>
</ul>
</li>
<li><p>inline Code</p>
<p>You can produce inline code by surrounding it with backticks.</p>
<pre><code>Use `rm -rf /` if you're a N00b.
Use ``rm -rf /`` if you're a N00b.
Use ```rm -rf /``` if you're a N00b.
</code></pre>
<p>Double and triple backticks can be used if the code itself contains backticks.</p>
</li>
</ul>
<h2>Titles</h2>
<p>Creating titles in smu is very easy. There are two different syntax styles. The
first is underlining with at least three characters:</p>
<pre><code>Heading
=======
Topic
-----
</code></pre>
<p>This is very intuitive and self explaining. The resulting sourcecode looks like
this:</p>
<pre><code><h1>Heading</h1>
<h2>Topic</h2>
</code></pre>
<p>Use the following prefixes if you don't like underlining:</p>
<pre><code># h1
## h2
### h3
#### h4
##### h5
###### h6
</code></pre>
<h2>Links</h2>
<p>The simplest way to define a link is with simple <code><></code>.</p>
<pre><code><http://s01.de>
</code></pre>
<p>You can do the same for E-Mail addresses:</p>
<pre><code><yourname@s01.de>
</code></pre>
<p>If you want to define a label for the url, you have to use a different syntax</p>
<pre><code>[smu - simple mark up](http://s01.de/~gottox/index.cgi/proj_smu)
</code></pre>
<p>The resulting HTML-Code</p>
<pre><code><a href="http://s01.de/~gottox/index.cgi/proj_smu">smu - simple mark up</a></p>
</code></pre>
<h2>Lists</h2>
<p>Defining lists is very straightforward:</p>
<pre><code>* Item 1
* Item 2
* Item 3
</code></pre>
<p>Result:</p>
<pre><code><ul>
<li>Item 1</li>
<li>Item 2</li>
<li>Item 3</li>
</ul>
</code></pre>
<p>Defining ordered lists is also very easy:</p>
<pre><code>1. Item 1
2. Item 2
3. Item 3
</code></pre>
<p>Only the first number in a list is meaningful. All following list items are
continously counted. If you want a list starting at 2, you could write:</p>
<pre><code>2. Item 1
2. Item 2
2. Item 3
</code></pre>
<p>and get the following HTML which will render with the numbers 2, 3, 4:</p>
<pre><code><ol start="2">
<li>Item 1</li>
<li>Item 2</li>
<li>Item 3</li>
</ol>
</code></pre>
<h2>Code & Blockquote</h2>
<p>Use the <code>> </code> as a line prefix for defining blockquotes. Blockquotes are
interpreted as well. This makes it possible to embed links, headings and even
other quotes into a quote:</p>
<pre><code>> Hello
> This is a quote with a [link](http://s01.de/~gottox)
</code></pre>
<p>Result:
</p>
<pre><code><blockquote><p>
Hello
This is a quote with a <a href="http://s01.de/~gottox">link</a></p>
</blockquote>
</code></pre>
<p>You can define a code block with a leading Tab or with <strong>4</strong> leading spaces</p>
<pre><code> this.is(code)
this.is(code, too)
</code></pre>
<p>Result:
</p>
<pre><code><pre><code>this.is(code)</code></pre>
<pre><code>this.is(code, too)
</code></pre>
</code></pre>
<p>Please note that you can't use HTML or smu syntax in a code block.</p>
<p>Another way to write code blocks is to use code fences:</p>
<pre><code>```json
{"some": "code"}
```
</code></pre>
<p>This has two advantages:</p>
<ul>
<li>The optional language identifier will be turned into a <code>language-</code> class name</li>
<li>You can keep the original indentation which helps when doing copy & paste</li>
</ul>
<h2>Tables</h2>
<p>Tables can be generated with the following syntax:</p>
<pre><code>| Heading1 | Heading2 |
| -------- | -------- |
| Cell 1 | Cell2 |
</code></pre>
<p>Aligning the columns make the input nicer to read, but is not necessary to get
correct table output. You could just write</p>
<pre><code>| Heading1 | Heading2 |
| --- | --- |
| Cell 1 | Cell2 |
</code></pre>
<p>To align the content of table cells, use <code>|:--|</code> for left, <code>|--:|</code> for right
and <code>|:--:|</code> for centered alignment in the row which separates the header from
the table body.</p>
<pre><code>| Heading1 | Heading2 | Heading3 |
| :------- | :------: | -------: |
| Left | Center | Right |
</code></pre>
<h2>Other interesting stuff</h2>
<ul>
<li><p>to insert a horizontal rule simple add <code>- - -</code> into an empty line:</p>
<pre><code>Hello
- - -
Hello2
</code></pre>
<p>Result:
</p>
<pre><code><p>
Hello
<hr />
</code></pre>
<pre><code>Hello2</p>
</code></pre>
</li>
<li><p>Any ASCII punctuation character may escaped by precedeing them with a
backslash to avoid them being interpreted:</p>
<pre><code>!"#$%&'()*+,-./:;<=>?@[]^_`{|}~\
</code></pre>
</li>
<li><p>To force a linebreak simple add two spaces to the end of the line:</p>
<pre><code>No linebreak
here.
But here is
one.
</code></pre>
</li>
</ul>
<h2>embed HTML</h2>
<p>You can include arbitrary HTML code in your documents. The HTML will be
passed through to the resulting document without modification. This is a good
way to work around features that are missing in smu. If you don't want this
behaviour, use the <code>-n</code> flag when executing smu to stricly escape the HTML
tags.</p>
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