Well, Knuth's programming style is idiosyncratic, to say the least. But in the early 80s, in advance of the publication of The TeXBook, I learned enough TeX fro

Well, Knuth's programming style is idiosyncratic, to say the least. But in the early 80s, in advance of the publication of The TeXBook, I learned enough TeX from reading the literate source for TeX to put together a 100-page software manual. I don't really agree with Knuth's version of literate programming, but one can hardly fault the TeX source for being unreadable.