pomodocs/commonmark-alert

CommonMark extension to support alerts in Github blockquote style

Maintainers

Package info

github.com/pomodocs/commonmark-alert

Type:commonmark-extension

pkg:composer/pomodocs/commonmark-alert

Statistics

Installs: 1 676

Dependents: 1

Suggesters: 0

Stars: 3

Open Issues: 0

Security

Advisories: 0

Aikido package health analysis

v0.7 2026-03-06 06:42 UTC

Requires

Requires (Dev)

MIT 952ccf0bff913d73d365199880d1230e653fabba

This package is auto-updated.

Last update: 2026-03-06 07:09:51 UTC

README

Tests Maintainability Code Coverage GitHub

CommonMark Alert Extension is an extension for League CommonmMark to support alerts in Github blockquote style.

Installation

Install the extension via Composer:

composer require pomodocs/commonmark-alert

Basic Usage

After installing it, register the extension in your Commonmark Environment:

<?php

require __DIR__ . '/vendor/autoload.php';

use League\CommonMark\Environment\Environment;
use League\CommonMark\MarkdownConverter;
use PomoDocs\CommonMark\Alert\AlertExtension;

$environment = new Environment();

$environment->addExtension(new AlertExtension());

$converter = new MarkdownConverter($environment);

Now you can write a blockquote alert everywhere in your documentation:

Lorem ipsum dolor sit amet, consectetur adipiscing elit.
Nullam eros tortor, scelerisque sit amet metus a, aliquet varius nisl. Cras elementum egestas tortor, vel finibus urna suscipit ac.

> [!TIP]
> Nulla lobortis ultricies massa id laoreet.
> Quisque ut varius est. Aliquam fringilla finibus eleifend.

Sed nec odio nec magna bibendum vulputate. Suspendisse at ipsum nisi.

It's converted into the following html:

<p>Lorem ipsum dolor sit amet, consectetur adipiscing elit.
Nullam eros tortor, scelerisque sit amet metus a, aliquet varius nisl. Cras elementum egestas tortor, vel finibus urna suscipit ac.</p>

<div class="alert alert-tip">
    <p class="alert-title">Tip</p>
    <p>Nulla lobortis ultricies massa id laoreet. Quisque ut varius est. Aliquam fringilla finibus eleifend.</p>
</div>

<p>Sed nec odio nec magna bibendum vulputate. Suspendisse at ipsum nisi.</p>

Of course, the look&feel of your html snippet depends on your CSS.

Configuration

You can configure this extension by passing an array of parameters to your environment:

<?php

require __DIR__ . '/vendor/autoload.php';

use League\CommonMark\Environment\Environment;
use League\CommonMark\MarkdownConverter;
use PomoDocs\CommonMark\Alert\AlertExtension;

$config = [
    'alert' => [
        'icons' => [
            'active' => true,
        ],
    ]
];

$environment = new Environment($config);

$environment->addExtension(new AlertExtension());

$converter = new MarkdownConverter($environment);

Here is the complete options array, with default values:

<?php

$options = [
    'alert' => [
        'class_name' => 'alert',
        'colors' => [
            'note' => 'note',
            'tip' => 'tip',
            'important' => 'important',
            'warning' => 'warning',
            'caution' => 'caution',
        ],
        'labels' => [
            'note' => 'Note',
            'tip' => 'Tip',
            'important' => 'Important',
            'warning' => 'Warning',
            'caution' => 'Caution',
        ],
        'icons' => [
            'active' => false,
            'use_svg' => true,
            'names' => [
                'note' => 'octicons octicons-info',
                'tip' => 'octicons octicons-light-bulb',
                'important' => 'octicons octicons-report',
                'warning' => 'octicons octicons-alert',
                'caution' => 'octicons octicons-stop'
            ],
            'svg' => [
                'note' => '<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 16 16" width="16" height="16" fill="currentColor"><path d="M0 8a8 8 0 1 1 16 0A8 8 0 0 1 0 8Zm8-6.5a6.5 6.5 0 1 0 0 13 6.5 6.5 0 0 0 0-13ZM6.5 7.75A.75.75 0 0 1 7.25 7h1a.75.75 0 0 1 .75.75v2.75h.25a.75.75 0 0 1 0 1.5h-2a.75.75 0 0 1 0-1.5h.25v-2h-.25a.75.75 0 0 1-.75-.75ZM8 6a1 1 0 1 1 0-2 1 1 0 0 1 0 2Z"></path></svg>',
                'tip' => '<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 16 16" width="16" height="16" fill="currentColor"><path d="M8 1.5c-2.363 0-4 1.69-4 3.75 0 .984.424 1.625.984 2.304l.214.253c.223.264.47.556.673.848.284.411.537.896.621 1.49a.75.75 0 0 1-1.484.211c-.04-.282-.163-.547-.37-.847a8.456 8.456 0 0 0-.542-.68c-.084-.1-.173-.205-.268-.32C3.201 7.75 2.5 6.766 2.5 5.25 2.5 2.31 4.863 0 8 0s5.5 2.31 5.5 5.25c0 1.516-.701 2.5-1.328 3.259-.095.115-.184.22-.268.319-.207.245-.383.453-.541.681-.208.3-.33.565-.37.847a.751.751 0 0 1-1.485-.212c.084-.593.337-1.078.621-1.489.203-.292.45-.584.673-.848.075-.088.147-.173.213-.253.561-.679.985-1.32.985-2.304 0-2.06-1.637-3.75-4-3.75ZM5.75 12h4.5a.75.75 0 0 1 0 1.5h-4.5a.75.75 0 0 1 0-1.5ZM6 15.25a.75.75 0 0 1 .75-.75h2.5a.75.75 0 0 1 0 1.5h-2.5a.75.75 0 0 1-.75-.75Z"></path></svg>',
                'important' => '<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 16 16" width="16" height="16" fill="currentColor"><path d="M0 1.75C0 .784.784 0 1.75 0h12.5C15.216 0 16 .784 16 1.75v9.5A1.75 1.75 0 0 1 14.25 13H8.06l-2.573 2.573A1.458 1.458 0 0 1 3 14.543V13H1.75A1.75 1.75 0 0 1 0 11.25Zm1.75-.25a.25.25 0 0 0-.25.25v9.5c0 .138.112.25.25.25h2a.75.75 0 0 1 .75.75v2.19l2.72-2.72a.749.749 0 0 1 .53-.22h6.5a.25.25 0 0 0 .25-.25v-9.5a.25.25 0 0 0-.25-.25Zm7 2.25v2.5a.75.75 0 0 1-1.5 0v-2.5a.75.75 0 0 1 1.5 0ZM9 9a1 1 0 1 1-2 0 1 1 0 0 1 2 0Z"></path></svg>',
                'warning' => '<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 16 16" width="16" height="16" fill="currentColor"><path d="M6.457 1.047c.659-1.234 2.427-1.234 3.086 0l6.082 11.378A1.75 1.75 0 0 1 14.082 15H1.918a1.75 1.75 0 0 1-1.543-2.575Zm1.763.707a.25.25 0 0 0-.44 0L1.698 13.132a.25.25 0 0 0 .22.368h12.164a.25.25 0 0 0 .22-.368Zm.53 3.996v2.5a.75.75 0 0 1-1.5 0v-2.5a.75.75 0 0 1 1.5 0ZM9 11a1 1 0 1 1-2 0 1 1 0 0 1 2 0Z"></path></svg>',
                'caution' => '<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 16 16" width="16" height="16" fill="currentColor"><path d="M4.47.22A.749.749 0 0 1 5 0h6c.199 0 .389.079.53.22l4.25 4.25c.141.14.22.331.22.53v6a.749.749 0 0 1-.22.53l-4.25 4.25A.749.749 0 0 1 11 16H5a.749.749 0 0 1-.53-.22L.22 11.53A.749.749 0 0 1 0 11V5c0-.199.079-.389.22-.53Zm.84 1.28L1.5 5.31v5.38l3.81 3.81h5.38l3.81-3.81V5.31L10.69 1.5ZM8 4a.75.75 0 0 1 .75.75v3.5a.75.75 0 0 1-1.5 0v-3.5A.75.75 0 0 1 8 4Zm0 8a1 1 0 1 1 0-2 1 1 0 0 1 0 2Z"></path></svg>'
            ]
        ]
    ]
];

Let's explain each configuration parameter.

class_name

The name of the CSS class to apply to the alert <div> tag.

colors

The name of the color classes to apply to the alert <div> tag. In example, if you use Bootstrap you could set the colors as the following:

$config = [
    'alert' => [
        'colors' => [
            'note' => 'primary',
            'tip' => 'info',
            'important' => 'success',
            'warning' => 'warning',
            'caution' => 'danger',
        ]
    ],
];

and the resulted <div> tag, for a NOTE alert will be:

<div class="alert alert-primary">

labels

An array of text labels that can be used to localize the alerts in different languages.

icons

An array of parameters to configure an optional icon, near the title. The icons array has the following keys:

  • active: if display the icon or not. Default is false.
  • use_svg: if use the svg icons defined in svg options array or use the css classes defined in names options array. Default is true.
  • names: the class names to use to apply the icons. Default: Octicons icon set.
  • svg: the svg icons to use. Default: Octicons icon set.

Let's suppose, in example, we want to use Fontawesome icons, using the web font. The configuration array could be the following:

$config = [
    'alert' => [
        'icons' => [
            'active' => true,
            'names' => [
                'note' => 'fa-solid fa-circle-info',
                'tip' => 'fa-regular fa-lightbulb',
                'important' => 'fa-solid fa-exclamation',
                'warning' => 'fa-solid fa-triangle-exclamation',
                'caution' => 'fa-solid fa-circle-exclamation'
            ]
        ]
    ]
];

Now, the following markdown:

> [!TIP]
> Nulla lobortis ultricies massa id laoreet.
> Quisque ut varius est. Aliquam fringilla finibus eleifend.

it results into:

<div class="alert alert-tip">
    <p class="alert-title"><i class="fa-regular fa-lightbulb"></i>Tip</p>
    <p>Nulla lobortis ultricies massa id laoreet. Quisque ut varius est. Aliquam fringilla finibus eleifend.</p>
</div>

If we want to use the default svg icons, the configuration array is the following:

$config = [
    'alert' => [
        'icons' => [
            'active' => true,
            'use_svg' => true
        ]
    ]
];

and the following markdown:

> [!WARNING]
> Warning lorem ipsum dolor sit amet, _consectetur adipiscing elit_
> sed do eiusmod tempor incidunt ut labore et dolore magna aliqua.

it results into the following html:

<div class="alert alert-warning">
<p class="alert-title"><svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 16 16" width="16" height="16" fill="currentColor"><path d="M6.457 1.047c.659-1.234 2.427-1.234 3.086 0l6.082 11.378A1.75 1.75 0 0 1 14.082 15H1.918a1.75 1.75 0 0 1-1.543-2.575Zm1.763.707a.25.25 0 0 0-.44 0L1.698 13.132a.25.25 0 0 0 .22.368h12.164a.25.25 0 0 0 .22-.368Zm.53 3.996v2.5a.75.75 0 0 1-1.5 0v-2.5a.75.75 0 0 1 1.5 0ZM9 11a1 1 0 1 1-2 0 1 1 0 0 1 2 0Z"></path></svg>Warning</p>
<p>Warning lorem ipsum dolor sit amet, <em>consectetur adipiscing elit</em>
sed do eiusmod tempor incidunt ut labore et dolore magna aliqua.</p>
</div>

Issues

Please, open an issue on Github repository.

Contributing

Please, see our Contributing guide.

Licensing

This library is released under MIT license.