Warning message for some scripts?

[eroux]

Some scripts are not really well supported by luaotfload (devanagari for instance), or by LaTeX packages (RTL languages), maybe luaotfload should output a warning when called with such scripts?

I was first thinking to put it in polyglossia, but the best place seems to be luaotfload, what do you think?

[khaledhosny]

As far as luaotfload is concerned, there shouldn’t be any specific issues with RTL, so I see no reason why luaotfload should concern itself about other packages (the said packages should be the one issuing the warning). For Indic scripts, there have at least been some work on Devanagari quite recently, so someone have to check it (and whether luaotfload has the needed files at all).

[eroux]

You're right about RTL, let's not issue a warning about it. Maybe the question about devanagari should be raised to Hans? I think most languages classed as "indic" should work though, I have the example of tibetan in mind...

[phi-gamma]

@khaledhosny are you referring to font-odv.lua? It’s been around since january. I checked and it appears to load with luaotfload, but Hans hasn’t included it into the merge file. We could include it for testing, maybe make it optional, but I have no idea how to test it.

[khaledhosny]

I’m not sure which file, there was a code contributed but someone, that Hans has since rewrote. Nor do I know how to test it.

[eroux]

For what I understand, maybe issuing just a warning for devanagari (not other Indic scripts) would be enough? What do you think?

[phi-gamma]

Where exactly do you think the warning would fit? When the user enables the devanagari feature set? How sure are you about those other Indic scripts?

[eroux]

As you say, it would fit best when, in a specification, we have the script deva or a script enabling the same features...

To be honest, I'm not sure about other indic scripts... but as I know Tibetan is working, I guess Khmer too, and I believe Thai too, so maybe it would be safe to output a warning for the scripts deva, beng, guru, gujr, orya, taml, telu, knda, mlym and sinh... what do you think?

[phi-gamma]

So when a user loads a font like this:

\font\mydeva=file:some-devanagari-font.ttf:mode=node;script=deva; at 12pt

this should trigger the warning? Or maybe if they try to add the devanagari feature set?

\font\mydeva=file:some-devanagari-font.ttf:mode=node;+devanagari; at 12pt

[phi-gamma]

phi-gamma@bb150cd