I read from the official manual (http://wiki.contextgarden.net/Fonts_in_LuaTex#How_LuaTeX_handles_system_fonts)
that I need to
export OSFONTDIR="/usr/local/share/fonts;$HOME/.fonts" to specify where the fonts should be looked for. However, it will only search
.fonts. If I have fonts in the sub directories of these two, they won't be discovered. I find it inconvenient.
Is it possible to make it search the subfolders?