Support TeX/LaTeX

[frabjous]

I was hoping to extend this to support comments for TeX/LaTeX files. I'm not that familiar with Lua or Lua patterns, but I gather part of the difficulty with this is that TeX/LaTeX comments start with the percent sign '%', which of course has special meaning for Lua patterns.
I tried adding each of these:
ft["tex"] = "% %s"
ft["tex"] = "%% %s"
ft["tex"] = "\% %s"
But none of them worked as I had hoped.
Thanks!