The Common Lisp Condition System – Upcoming Book
Author here. The book has just gone to production and will be available at the end of the year in dead-tree and electronic formats.The book happened because I got annoyed at the fact that there is no good reference that shows how the condition system works, what are the foundations required for it to work, what are the basic building blocks that it is composed of, and what are its uses, both in the domain of  handling exceptional situations and, more importantly and less obviously, outside that domain.The book also contains a description of a full implementation of a condition system that can (and hopefully will!) be used outside Common Lisp. There's hope that some languages will pick up these parts of Common Lisp that fully decouple the acts and means of signaling conditions from the acts and means of handling them, therefore allowing for means of dynamically controlled control flow that are currently very hard to achieve in other languages.The accompanying code is available at https://github.com/phoe/tclcs-code and https://github.com/phoe/portable-condition-system - it will be copied over to the Apress repository soon.Linked Reddit thread: https://www.reddit.com/r/lisp/comments/hrjzs8/AMA, I guess.