This is the repo for the HHVM and Hack user documentation. Contributions and feedback are welcome.

There are three keys areas to this repo:

• User Documentation: The guides. We realized that finding out how to do simple things like setting up HHVM to more complicated things like using async were more tedious than they should be. The documentation should be a friend, not a nuisance.
• API Reference: We use our own HHVM code documentation for Hack and HHVM specific API documentation. And for anything PHP specific, we defer to php.net. This serves two purposes:
  • The HHVM source code is the source of truth
  • We don't duplicate PHP documentation, and their documentation will serve as the source of truth for PHP-specific documentation
• Infrastructure: An easier, more modular and scalable way for documentation. Markdown, not docbook, for user-guide content. Easy to follow, Hack-based source code for building the site.

Our strategy to create better documentation begins with a re-thinking of our doc infrastructure.

• Markdown instead of docbook provides an easier path for documentation source readability and updates.
  • Have extensions to support things like example insertion, etc.
• Token scan our the HHVM code block documentation (instead of reflection) so that rebuilding HHVM isn't necessary to update the documentation.
  • Use phpDocumentor for docblock parsing
• Ensure the source code that builds the site is as reusable as possible, so that it has the potential to provide reusability to documentation projects beyond Hack and HHVM.

Check out the source code for building the site. bin/build.php is where all the execution begins.

If you would like to build the site locally (e.g., to test your content contributions), you will need to install and configure your system to be able to build and run the site locally.

These are the basic step-by-step instructions to get you up and running. It assumes certain packages are installed on your system. Click here for detailed installation information.

1. Clone the HHVM repository anywhere convenient.
2. Clone this repo.
3. cd path/to/user-documentation
4. Copy LocalConfig.php.example to LocalConfig.php
5. Adjust the LocalConfig::HHVM_TREE constant to point to your checkout of HHVM.
6. hhvm /path/to/composer.phar install # Make sure you have composer downloaded
7. sudo gem install bundler # to get Ruby bundles
8. bundle --path vendor-rb/ # install required ruby bundles
9. hhvm bin/build.php # build the site!

Configure a webserver and HHVM to serve the public/ directory, with all requests that don't match a file being served by index.php. For local development, HHVM's built-in webserver should be sufficient:

$ cd user-documentation/public
user-documentation/public$ hhvm -m server \
  -p 8080 \
  -c ../hhvm.dev.ini

Check out the contribution guidelines.

You can contribute to the site through pull requests.

Follow along with our progress. We have made this repo open from the start and you will see everything that happens from our very first commit.

If you see anything egregious, you can file an issue or ping us at #hhvm-dev on Freenode IRC or hhvm.dev on Facebook