You basically need to make a sources/forum/vanilla.php file, use e.g. phpbb2.php as a base. Most of the work is in finding what the table and field names are, then getting the authorisation right which can be fiddly (especially fiddly if you want shared login cookies).

Regarding embedding, we can do that by default because the 'forums' module can proxy the forum in. Making a new module that uses their own embed HTML would be quite trivial (e.g. making a minimodule and essentially just pasting their code into it). The main problem is really layout - it is pretty hard to get two very different CSS designs to fit well together, in term of both design and engineering the CSS to not conflict.

To be honest, not many people are a fan of the forum integration ever since we wrote Conversr. Personally I think it's planning to fail at design, because it results in what is a visible kludge, and post-iPhone people expect much slicker sites. But if you're already invested in Vanilla, it may make some sense.

The CSS issue is trivial here because Vanilla offer an embed-friendly theme as part of the default package that sizes itself as per the layout and has minimal design.

I understand why forum integration has gone cold. Integration is not integrating the systems but rather syndicating them. Vanilla is a little different though. It was designed with embedding in mind in my opinion. I will look into this further.

How do you get all the variables in the file. Do you analyse each table in the database for that or there is an easier way I know nothing about?

Analyse

Closed due to lack of activity. May be reopened if fresh interest.