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How to add 4D code highlight to GitHub Pages.

Introduction

It's really easy to publish a public repository as a GitHub Pages site.

As described in the official Quickstart, you just need to

  1. Click Settings
  2. Click Code and automation > Pages
  3. Select main branch, / (root) path, and save

…and that's it.

To add a Jekyll Theme you just need to

  1. Add a file named _config.yml to the root of the repository
  2. Add a line to the file that specifies one of the supported themes, e.g.
theme: jekyll-theme-minimal

You can also add 4D code to the page using markdown, but here is the problem; syntax highlighting is not applied.

This is because the default syntax highlighter does not support the 4D language.

Solution

  1. Go to highlightjs/highlight.js and clone the repository. This library supports the 4D language

  2. Follow the instruction to build highlight.js

  3. Open Terminal at the root of the repository. You can specify the languages you want to include in the build, e.g.

node tools/build.js 4d css javascript xml json sql yaml php

  1. Add an assets/js folder to the root of the repository

  2. Copy the generated highlight.min.js to this folder

  3. Add an assets/css folder to the root of the repository

  4. Copy the styles in src/styles to this folder

  5. Add a _includes/head-custom.html file to the root of the repository. The HTML snippet in this file is added to the page.

  6. Add references to highlight.min.js and the style of your choice, e.g.

<link rel="stylesheet" href="{{ 'assets/css/base16/gigavolt.css' | relative_url }}">
<script type="text/javascript" src="{{ '/assets/js/highlight.min.js' | relative_url }}"></script>
<script>hljs.highlightAll();</script>
  1. Add lines to _config.yml to disable the default syntax highlighter
kramdown:
  syntax_highlighter_opts:
    disable : true

Result

$param:=New object
// Close the process after 2s if not already terminated
$param.timeout:=2
// Start the system worker with the parameter defined above
$sys:=4D.SystemWorker.new("git --version";$param)

// Wait for the end or the process and return the response from Git
ALERT($sys.wait().response)