[luatex] Prevent stop when tiff file loads

[luigi scarso]

On Thu, Jan 21, 2016 at 10:10 PM, Patrick Gundlach <patrick at gundla.ch>
wrote:

> >>
> >> Is there a way to prevent LuaTeX from stopping the whole process? Is
> there a function like
> >>
> >> can_you_handle_this_imagetype(filename="foo.tiff")
> >>
> >> ?
> >
> > local imgscan   = img.scan
> > local supported = { pdf = true, jpg = true, png = true }
> >
> > function img.scan(t)
> >    if t and t.filename then
> >        local e = string.match(t.filename,".-%.(.-)$")
> >        if supported[e] then
> >            return imgscan(t)
> >        end
> >    end
> > end
> >
> > local foo = img.scan({filename = "foo.tiff"})
> > local foo = img.scan({filename = "foo.pdf"})
>
>
> in my (real) case I don't have a file extension. I need to ask LuaTeX: do
> you understand that file format? I guess there is no way except for a fatal
> error, right?
>
> Patrick
>
>
>
>
Why not mimic the Unix file command in Lua ?

-- 
luigi
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