You're in luck. TeX is written in literate style, and its documentation/source is available here: http://brokestream.com/tex-web.html http://brokestream.com/tex

You're in luck. TeX is written in literate style, and its documentation/source is available here: http://brokestream.com/tex-web.html http://brokestream.com/tex-web.html You can also read Knuths description of the Web system he under to write the code here: http://www.literateprogramming.com/knuthweb.pdf http://www.literateprogramming.com/knuthweb.pdf