[luatex-fonts] non-ascii filenames in font cache

[Philipp Gesang <philipp.gesang@alumni.uni-heidelberg.de>]

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Hi Hans,

the font cache currently drops non-ascii bytes when creating file
names by means of containers.cleanname(). Dohyun Kim sent a fix
for data-con.lua (see below). My own test with the unicode
library leads to some odd results.

Also I noticed that as a pattern, [^%w%d] is a bit redundant
since %d is a subset of %w in both string and unicode.utf8.

Regards
Philipp



#!/usr/bin/env texlua
local non_ascii_names = {
  [[华文仿宋.ttf]], [[华文细黑.ttf]], [[华文黑体.ttf]],
}

--- [a]: current data-con
--- [b]: include non-ascii (proposed by Dohyun Kim)
--- [c]: with selene unicode

for i = 1, #non_ascii_names do
  local name = non_ascii_names[i]
  print""
  print("[a]", name, string.gsub(string.lower(name),             "[^%w%d]+","-"))
  print("[b]", name, string.gsub(string.lower(name),             "[^%w%d\128-\255]+","-"))
  print("[c]", name, unicode.utf8.gsub(unicode.utf8.lower(name), "[^%w%d]+","-"))
end


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