[luatex] Undocumented callbacks

[Hans Hagen]

On 6/22/2015 9:24 AM, Joseph Wright wrote:
> Hello all,
>
> Running
>
>      \directlua{
>        for i,_ in pairs(callback.list()) do
>          texio.write_nl("- " .. i)
>        end
>      }
>      \bye
>
> with LuaTeX 0.80.0 (TL'15) lists 58 callbacks. Comparing the list with
> those in the manual, there seem to be four undocumented ones:

- char_exists

obsolete (never was active)

- pdf_stream_filter_callback

this is something old experimental that will go

- find_cidmap_file
- read_cidmap_file

these are not used by the engine but are there for completeness as a lua 
font loader might need them

Hans

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