[Dev-luatex] Callbacks in Lua wrapper of mplib

luigi scarso luigi.scarso at gmail.com
Wed Nov 7 13:00:50 CET 2018

On Wed, Nov 7, 2018 at 12:18 PM Marcel Kr├╝ger <tex at 2krueger.de> wrote:

> Hi,
> I recently discovered that the Lua wrapper of mplib registers all
> callbacks globally
> such that creating multiple mplib instances with different callbacks
> breaks.
why not this ?

      local current_instance
      local custom_find_file =  custom_find_file or {}
      local mp_find_file_driver = function(name, mode, type) print("I am
",current_instance) if custom_find_file[current_instance] then return
custom_find_file[current_instance](name, mode, type) else  return
"unregistered" end end
      custom_find_file['mp1'] = function(name, mode, type) return name end
      custom_find_file['mp2'] = function(name, mode, type) if name ==
'cmr10' then print'This should not happen' end return name end

      local mp1 = mplib.new{
        find_file = mp_find_file_driver

      local mp2 = mplib.new{
          find_file = mp_find_file_driver
      current_instance = "mp1"
        input cmr10;

      current_instance = "mp2"
        input cmr10;


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