README

Reusable league/commonmark extensions in a monorepo, installable as either the umbrella package alto/commonmark or as standalone per-extension packages.

Installation

composer require alto/commonmark

alto/commonmark declares replace on all standalone packages, so dependency resolution stays compatible whether you install one or all.

Extension	Description	GitHub	Packagist
CodeBlockTitle	Titled fenced code blocks rendered as `<figure>`	GitHub	Packagist
ContentSlicer	Wraps heading sections in semantic `<section>` elements	GitHub	Packagist
HeadingLevel	Shift or remap heading levels across the document	GitHub	Packagist
Import	Import file contents into code blocks with line ranges	GitHub	Packagist
Include	Inline-include Markdown fragments for doc composition	GitHub	Packagist
LinkRewriter	Rewrite links & images via base URI, map, or regex	GitHub	Packagist
Source	Embed source files with line numbers and highlighting	GitHub	Packagist
TableOfContents	Auto-generated TOC from headings via `@toc`	GitHub	Packagist
Tabs	Accessible ARIA tabbed UI from a simple `@tabs` directive	GitHub	Packagist

Extensions

CodeBlockTitle

The detail that signals craft — adds a title="..." to any fenced code block and wraps it in a semantic <figure>/<figcaption>. One small thing that makes a doc site feel finished.

```php title="hello.php"
echo "Hello";
```

<figure class="code-block has-title" data-title="hello.php">
  <figcaption class="code-title">hello.php</figcaption>
  <pre><code class="language-php">echo "Hello";
</code></pre>
</figure>

Doc · GitHub · Packagist

ContentSlicer

The rarest one in the set. Most processors stop at rendering headings as tags — this one restructures the entire document into a properly nested <section> tree, giving CSS selectors, JavaScript, and accessibility tooling something real to work with. No custom syntax needed.

## Subtopic 1
More content.
## Subtopic 2
Final content.

<section><h2>Subtopic 1</h2><p>More content.</p></section>
<section><h2>Subtopic 2</h2><p>Final content.</p></section>

Doc · GitHub · Packagist

HeadingLevel

The one you don't need until you really do — then it's irreplaceable. Shifts, remaps, or transforms heading levels when embedding content from one context into another without heading hierarchy collisions.

# Title
## Section

<!-- with down: 1 -->
<h2>Title</h2>
<h3>Section</h3>

Doc · GitHub · Packagist

Import

Solves copy-paste drift between your docs and your source code. Pulls external file content directly into a code block — with line-range selection, language hinting, and depth-limited circular-import protection.

@import "src/Auth.php" {lines: 1-30, lang: php}

<pre><code class="language-php">// src/Auth.php lines 1–30
</code></pre>

Doc · GitHub · Packagist

Include

The backbone of large documentation sets. Pulls in and fully parses markdown fragments inline — making one-file-per-section composition possible without a build system.

@include "parts/intro.md"

<h2>Introduction</h2>
<p>This is the introduction section.</p>

Doc · GitHub · Packagist

LinkRewriter

Indispensable plumbing for any hosted documentation setup. Decouples your markdown from your deployment URL with a composable chain of rewrite rules — base URI, exact maps, regex, and custom callbacks — applied in sequence.

[Guide](/getting-started)
![Logo](/assets/logo.svg)

<!-- with base_uri: https://docs.example.com -->
<a href="https://docs.example.com/getting-started">Guide</a>
<img src="https://docs.example.com/assets/logo.svg" alt="Logo">

Doc · GitHub · Packagist

Source

The flagship of the set. Embeds a real file — not a copy — directly into your documentation, with syntax detection, line-range selection, line numbers, and per-line highlighting. Your docs stay in sync with your code by definition.

@source "src/Service.php" {lines: 9-11, numbers: true, highlight: "9,11"}

<div class="source-block">
  <div class="source-path">src/Service.php</div>
  <pre><code class="language-php"><span class="line highlighted"><span class="line-number">9</span>    public function add(int $a, int $b): int</span>
<span class="line"><span class="line-number">10</span>    {</span>
<span class="line highlighted"><span class="line-number">11</span>        return $a + $b;</span></code></pre>
</div>

Doc · GitHub · Packagist

Tabs

One directive, fully accessible tabbed UI, zero JavaScript to write. Wraps content in proper ARIA tablist/tab/tabpanel roles with a self-contained switching script.

@tabs
@tab "PHP"
```php
echo 'Hello';
```
@tab "JS"
```js
console.log('Hello');
```
@endtabs

<div class="tab-group" data-tabs-id="tabs-1">
  <div class="tab-list" role="tablist">
    <button class="tab active" role="tab" aria-selected="true"  aria-controls="tabs-1-panel-0">PHP</button>
    <button class="tab"        role="tab" aria-selected="false" aria-controls="tabs-1-panel-1">JS</button>
  </div>
  <div class="tab-panels">
    <div class="tab-panel" id="tabs-1-panel-0" role="tabpanel">…</div>
    <div class="tab-panel" id="tabs-1-panel-1" role="tabpanel">…</div>
  </div>
</div>

Doc · GitHub · Packagist

Support

If Alto CommonMark is useful to your project, sponsoring on GitHub is a great way to support continued development — and it's always appreciated.

License

MIT. See LICENSE.

alto / commonmark

Maintainers

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README

Installation

Extensions

CodeBlockTitle

ContentSlicer

HeadingLevel

Import

Include

LinkRewriter

Source

TableOfContents

Tabs

Support

License