Drupal 7 port

Here's a patch for the start of a D7 version. I think I've gotten everything working, but I don't fully understand the search stuff -- so let me know!

Two features I'd like to add are integration with Apache Solr, and the ability to select which node types to have on the options list (since both Books and Chapters are in the book table, each of those nodes is listed rather than just the parent Books).

It is a really great modul and a searching a long time for this ... because I´m looking for a D7 version. I tried it out and it seems to work.
Right now I work with a custom search of mine created with views and it would be really great if there could be a views integration, so you can create a custom Search form in views with integration or option to search only in one or some books ...
Furthermore it could be that you have to activate at least one book to get the search block - it is not enough to leave all checkboxes blank in the search book configuration.

But, really great and good stuff.
Thanks.

I made some further tests and it seems that this D7 port overrides the content access settings. I tested against a self made search over views and the default node search of drupal.
at the end the result is that the book search finds a node, where the user does not have any permissions.
Maybe you can check this.
Thanks.

I created a separate repository. Since that was the point of this issue, I am marking it fixed.