VarspoolPygmentsBundle

Provides (X)HTML rendering of Markdown similar to GFM (Github flavored markdown), including syntax-highted fenced code blocks. Code coloring is provided by the Python Pygments library (interfaces with pygmentize using proc_open for now).

VarspoolPygmentsBundle doesn't reinvent the wheel: it uses the Sundown support in KwattroMarkdownBundle to do the initial Markdown rendering.

Installation

Install the Sundown PHP extension

The Sundown extension is available via PECL in beta state, so installing it should be something like:

sudo pecl install sundown-beta

You'll be able to tell you're successful when the Sundown extension is shown in the output of php\_info():

php -i | grep 'Sundown Support'

Install pygments

This is usually available via your package manager, as the python-pygments package or similar.

sudo apt-get install python-pygments

The key thing, however, is just that you have the pygmentize script available to execute. It's usually at /usr/bin/pygmentize, but if not, you can configure its location (see app/config.yml below).

Composer

Add varspool/pygments-bundle to your requires field. Then install/update your dependencies.

app/AppKernel.php

Register the KwattroMarkdownBundle and VarspoolPygmentsBundle:

# app/AppKernel.php
public function registerBundles()
{
    $bundles = array(
        //...
        new Kwattro\MarkdownBundle\KwattroMarkdownBundle(),
        new Varspool\PygmentsBundle\VarspoolPygmentsBundle(),
    );
}

app/config.yml

Next, configure the default Markdown renderer for the kwattro_markdown service, so that it'll stop complaining.

kwattro_markdown:
    renderer:     xhtml

You can optionally configure where to find the pygmentize script. The default is /usr/bin/pygmentize:

varspool_pygments:
    bin:     /usr/local/bin/pygmentize

You can also specify lexer arguments, that'll be passed to Pygmentize. See the documentation for a list:

varspool_pygments:
  lexer_arguments:
    linenos: table

Despite its name, this option can also contain formatter arguments, such as linenos.

Usage

Services

kwattro_markdown

KwattroMarkdownBundle usually provides the kwattro_markdown service. This won't change when you set up VarspoolPygmentsBundle: the service will continue to provide a Markdown rendering without syntax highlighting. This service is usually a Kwattro\MarkdownBundle\Markdown\KwattroMarkdown object.

$xhtml = $this->get('kwattro_markdown')->render($markdown_source);

varspool_markdown

Once you've installed VarspoolPygmentsBundle, you'll have a second service available: vaspool_markdown. This service will extend Kwattro\MarkdownBundle\Markdown\KwattroMarkdown, so you should just be able to swap it in as a replacement quite easily. It'll colorize fenced code blocks in the markdown. This service is usually a Varspool\PygmentsBundle\Markdown\KwattroMarkdown object.

$colorized_xhtml = $this->get('varspool_markdown')->render($markdown_source);

varspool_pygments

This service is the Sundown renderer instance responsible for coloring the output. It's usually an instance of Varspool\PygmentsBundle\Sundown\Render\ColorXHTML.

Stylesheets

The Pygments renderer marks up parts of the output with div tags and classes. You'll then need to assign stlying to these tags.

SCSS/Compass

If you're already using Compass or SASS, there's an example Pygments stylesheet in Resources/public/css/_pygments.scss. The default implementation uses the Solarized color scheme. You should be able to @import this stylesheet from one of your own.

Dynamic Styles

Pygments can provide one of several stylesheets to automatically color the output. A controller is provided that will output styles by calling pygmentize -S <style>. To use the controller, reference it from your routing:

# app/config/routing.yml
varspool_pygments:
  resource: '@VarspoolPygmentsBundle/Controller/PygmentsController.php'
  type: annotation

Then include a CSS file in your page via the URL /pygments/<pygments_formatter>/<pygments_style>.css. (e.g. /pygments/html/friendly.css).

Alternatively, you can get the styles as a string from the varspool_pygments service:

$pygments_formatter = $this->container->get('varspool_pygments');
$styles = $pygments_formatter->getStyles('friendly');