XOOPS/XoopsCore — pull request #161 by geekwright (2014-07-18 02:38:10+00:00)
Title: Convert pdf extension to a service provider

- Define an 'htmltopdf' provider contract
- Use TCPDF 6.0.088 internal HTML handling
- Implement in Publisher and Codex modules
- Add tecnick.com/tcpdf requirement to main composer.json
- add isAvailable() method to Provider to simplify conditional flows based on availability of a real service provider (i.e. suppress links when no provider is available.)

Eventually, this extension should be moved out of core, and into a composer installable module repository. The tcpdf package could then be removed from xoops/core, and only installed when needed.