[lltx] luaotfload suggsetion: font catalogue

[Manuel Pégourié-Gonnard]

Hi,

While writing lualatex-doc, I realised there is no single easy way for users to
the list of fonts available to LuaLaTeX. However, luaotfload has a nice font
name database.

I wonder if it would be easy to create a command-line tool for querying this
database. Also, is there a way to create a pdf with a sample of every font
family available?

That would be great!

Manuel.