Re: Chinese opentype fonts can not be loaded in luatex-plain

[Dohyun Kim <nomosnomos@gmail.com>]

2009/5/12 Hans Hagen <pragma@wxs.nl>:
> Yanrui Li wrote:
>>
>> Hi Hans,
>>
>> I tried to use Chinese opentype fonts with luatex + plain fmt but I
>> failed. Only with Chinese TTF fonts it can work.
>>
>> This a simple example:
>>
>> \pdfoutput=1
>> \font\myfont=AdobeSongStd-Light
>>
>> \myfont
>> 我想实现 LuaTeX 对中文的支持
>>
>> \end
>>
>> When I compiled it, I got the following messages:
>>
>> This is LuaTeX, Version beta-0.41.0-2009051221 (Web2C 7.5.7)
>>  \write18 enabled.
>> (tt.tex (luatex-basics.tex) (luatex-fonts.tex <luatex-fonts-merged.lua>
>> <luatex
>> -fonts.lua loaded in 0.027 seconds>) (luatex-mplib.tex)
>> LuaTeX warning: lua-loaded font [51]
>> (/usr/share/fonts/adobe/AdobeSongStd-Light
>> .otf) has no characters!
>> [1{/opt/context/tex/texmf/fonts/map/pdftex/plain/pdftex.map}]
>> ){/opt/context/te
>>
>> x/texmf/fonts/enc/dvips/lm/lm-rep-cmrm.enc}</opt/context/tex/texmf/fonts/type1/
>> public/lm/lmr10.pfb>
>> Output written on tt.pdf (1 page, 17128 bytes).
>> Transcript written on tt.log.
>
> this is because a cidmap is needed and the kpse that you use does not have
> it; upcoming versions of kpse (and luatex's kpse lib) will support it given
> that you also adapted your texmf.cnf accordingly then
>
> so a bit patience is needed
>

Yes, that is a source of problem; more obstacles, however, are waiting for us.

1.
To test an cid-keyed opentype fonts, I have copied *.cidmap files
into current directory and processed a simple document with luatex-plain.
But it did not work:

This is LuaTeX, Version beta-0.40.1-2009050920 (Web2C 7.5.7)
 \write18 enabled.
(nanumotf.tex
(/media/disk/context/tex/texmf-context/tex/generic/context/luatex-basics.tex)
(/media/disk/context/tex/texmf-context/tex/generic/context/luatex-fonts.tex <lu
atex-fonts-merged.lua> <luatex-fonts.lua loaded in 0.027 seconds>)
(/media/disk/context/tex/texmf-context/tex/generic/context/luatex-mplib.tex)
LuaTeX warning: lua-loaded font [51] (/media/disk/context/tex/texmf-local/fonts
/opentype/korean/NanumGothic.otf) has no characters!

The same message as that of Li Yanrui's experiment, which would not
occur on windows machine. But I am on my linux box, whose
file system, as you know, distinguishs upper- and lower-case letters:
Adobe-Korea1-2.cidmap is quite different from adobe-korea1-2.cidmap.
So I added one line into luatex-fonts-merged.lua as follows:

--- ../tex/texmf-context/tex/generic/context/luatex-fonts-merged.lua	2009-05-12
18:29:55.000000000 +0900
+++ luatex-fonts-merged.lua	2009-05-13 01:14:55.000000000 +0900
@@ -3898,6 +3898,7 @@

 local function locate(registry,ordering,supplement)
     local filename = format(template,registry,ordering,supplement)
+    filename = string.lower(filename)
     local cidmap = fonts.cid.map[filename]
     if not cidmap then
         if trace_loading then


2.
However, I still got an error even after that one-line patch:

This is LuaTeX, Version beta-0.40.1-2009050920 (Web2C 7.5.7)
 \write18 enabled.
(nanumotf.tex
(/media/disk/context/tex/texmf-context/tex/generic/context/luatex-basics.tex)
(/media/disk/context/tex/texmf-context/tex/generic/context/luatex-fonts.tex <lu
atex-fonts-merged.lua> <luatex-fonts.lua loaded in 0.029 seconds>)
(/media/disk/context/tex/texmf-context/tex/generic/context/luatex-mplib.tex)
! LuaTeX error ./luatex-fonts-merged.lua:3879: attempt to call field 'loaddata'
 (a nil value).

In other words, loaddata is not defined.  So I issued "grep" command,
which helped me finding "io.loaddata" function defined in l-io.lua.

In sum:
even after modification of kpse, two more problems should be fixed.
1. lowering uppercase filename before searching cidmap
2. including l-io.lua into luatex-plain

Regards,
Dohyun Kim
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