> Do I pick up any beginners book on Lua?
There really is only one beginners book on Lua :-) _Programming in
Lua_, by Roberto Ierusalimschy, the Lua author. There are a few other
books, mostly about "Lua and games", because Lua has become quite
popular in the gamers' community, but Roberto's book is really excellent
and makes a good tutorial.
> For example, one of the lines in the code is
>
> tprint = function(s) tex.sprint(tex.ctxcatcodes,s) end
>
> Is this Lua or LuaTex?
The question does not really makes sense if you put it that way. This
line of code is pure Lua, it is completely syntactically correct; but
you can't use as it a standalone Lua script, because it uses functions
that only LuaTeX and ConTeXt define (think of it as the action of
"import" in Python, except that here it's not available as a stand-alone
library call; it's built into LuaTeX).
Hence, if you want to become proficient in Lua programming in ConTeXt,
you need to learn:
* The Lua programming language, with its core libraries (covered in
the aforementioned book).
* The Lua libraries that LuaTeX adds to Lua, documented in the LuaTeX
manual.
* The Lua libraries that ConTeXt adds to LuaTeX.
The above line of code is really a mixture of the three, but in any
case, the ground stone is always Lua.
Arthur
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