Doxygen is a fantastic tool for creating high-quality, in-depth source code documentation almost straight out of the box. At the most basic level, Doxygen scans your source code, looking for a unique comment string, extracts the relevant information and compiles them into a LaTeX and HTML format. For more information, check out the Doxygen website. These files could be directly attached to your repository, but I would argue that defeats the purpose of auto-generation.
One option is to host the available HTML files online. Unfortunately, if your not immediately familiar with web design and hosting, like myself, this could prove troublesome.
Enter GitLab CI/CD
If you are using GitLab for your revision control, you can take advantage of its build-in Continuous Integration and Continuous Deployment (CI/CD) Pipeline to run automated tasks when committing new code. If you’re like me, you have been avoiding GitLab’s CI/CD features out of fear and uncertainty, but to my surprise, Gitlab makes using these tools insanely easy; for most tasks, its a simple point and click functionality.
Here I will show how to create a job file to generate and post your Doxygen generated files.
From the repository web UI, add a new file.
From the Select Template Type drop-down, select .gitlab-ci.yml
From the Apply Template drop-down, select Doxygen
Slight modifications to the script may be needed depending on the structure of your project, mainly where your Doxygen related files are.
Now anytime you commit/push to your master branch, GitLab will automatically run this script, and on its success, it’ll post your HTML to its own unique URL; The URL can be found under Settings » Pages
See example here