It looks great. I have not read it to completion just yet, but merely scrolling through the document leaves me with a feeling that the author got tired and decided "this is a good stopping point."
To be fair, writing a book about Emacs is a Sisyphean effort by definition - this sea is a bottomless abyss of hackery abundance, and any meaningful effort to explain it is worth a celebration.
The Emacs' bundled documentation on Elisp (both the intro and the rest) are pretty much complete enough.
On Elisp and multithreading/processing, well, just look at bordeaux-threads in Common Lisp where the support is not universal for Clisp. SBCL and ECL work, but...
I have a silly little vibe coded extension where I can star certain HN commenters so I know who to look for in which threads (just puts a small symbol next to the username)
Reminds me of RES (Reddit Enhancement Suite) which I used to use a long time ago to do the same thing. One cool thing RES used to do was (if I remember right) when you clicked on the tag/note placed on the user it would take you to the comment when you first attributed that tag/note.
On one hand I kinda miss doing stuff like that and would like a RES for Hacker News but on the other hand I feel like cyber stalking is out of fashion these days.
Emacs is like a hackers' playground. It's an editor, it has a Lisp, networking support, tools, IRC, Email, Usenet and more by default, a PDF reader, a calculator (with gnuplot support it has graphs), a doc generating platform, an agenda, a silly chatbot...
With Emacs widgets and some settings at init.el (for speed) you can almost create a grude GUI for something with all the power of Elisp (and disabling nearly all keybdings OFC).
To be fair, writing a book about Emacs is a Sisyphean effort by definition - this sea is a bottomless abyss of hackery abundance, and any meaningful effort to explain it is worth a celebration.
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