In this new post to his site Matthew Weier O'Phinney details the process they (Zend) used to create the documentation for the latest release of their Expressive PSR-7 compatible framework (now in v1.0).

One of the final tasks in prepping for the Expressive 1.0 release was setting up the documentation site. We'd decided to use GitHub Pages for this, and we wanted to automate builds so that as we push to the master branch, documentation is deployed.

The process turned out both simple and bewilderingly difficult. This post is intended to help others in the same situation.

While they decided on MkDocs for the actual document generation (written in Python) Matthew how he integrated it with the builds they'd already created for the Expressive framework. He talks about reusability for the process, eventually using it again on the Zend Framework side. He also shows the full process for creating the resulting documentation and pushing it over to GitHub Pages including the setup of the credentials, which events should trigger the build and handling environment variables and software dependencies. It's a great post with plenty of details on each step of the process - I'd highly recommend it if you're looking into building these sorts of documents for your project.