my Latex and Tex4ht cheat sheet

2.43.4 reversing enumeration list
Given enumeration list, where each item just uses one line, to reverse it:
% !TEX TS-program = lualatex
\documentclass{article}
\usepackage{luacode}
\usepackage{amsmath}
%------------------------
\begin{luacode*} -- copy the list here as is.
data=[[\item 2001
\item 2002
\item 2003
\item 2005 was a very good year
\item 2006 was also a very good year
\item 2007
]]
function string:split(sep) --http://lua-users.org/wiki/SplitJoin
local sep, fields = sep or ":", {}
local pattern = string.format("([^%s]+)", sep)
self:gsub(pattern, function(c) fields[#fields+1] = c end)
return fields
end
function flip()
lines = data:split("\n")
tex.print("\\begin{enumerate}")
for i=#lines,1,-1 do
tex.print(lines[i])
end
tex.print("\\end{enumerate}")
end
\end{luacode*}
\newcommand\flip[0]{ \directlua{flip()}}%
\begin{document}
\flip{}
\end{document}
Another way is
47