After a longer battle against various converters, pdf extractors, pdf image extractors, I have managed to convert the designer's guide into an acceptable state and added it to my "make docs diffable" PR.
But oh boy it will still need a lot of fixing..
- the headings are still there but not marked as such so the whole document structure is gone, the headings will need to be manually found and marked as headings again
- there are 280 (!) embedded images, but many of them are unnecessary, e.g. there are a lot of <hr> lines which are embedded images, a seperate image for every <hr> line, there are little grey blocks that are embedded images as well, it looks like probably half of these 280 can be kicked out
- it's probably too big for a single document but I think asciidoc will make it easy to split it up by chapter
But overall it looks pretty good as a first step towards maintainability, considering that it's a huge document and it was only available in PDF format for many years. Have a look: https://github.com/yanlyub/vassal/blob/ ... guide.adoc