Since a while we integrated a continuous integration solution into CODESYS Forge. The integration goes slowly, step by step. The concepts are described here.
While the integration for our users is still in a beta phase, the automatic extraction of the source code from CODESYS projects and libraries is already working.
So if you don't configure anything special, the source code of your projects and libraries will be shown in the source browser. To see the code, just click on a project or library in the source browser.