[luatex] texlua vs. luatex

[Hans Hagen]

On 4/22/2013 11:29 AM, Élie Roux wrote:
> Dear all,
>
> I'm in front of a strange problem: I have a .lua script that can be
> called from both luatex and texlua, and I would like to have a different
> behaviour according to the caller. The problem is that I cannot find a
> reliable way to know if the script is called with texlua or luatex...
>
> I cannot inspect arg[0] because some scripts are just symbolic links to
> texlua or luatex and it's impossible to have information from it.
>
> I cannot try texconfig.formatname nor texconfig.jobname as these are
> never filled in the formats in TeXLive (this is something I would like
> to address soon).
>
> I tried to look into ConTeXt sources, but I did not manage to find a
> clue (especially since I don't know the sources well)...
>
> What would be the best solution?

arg[-2] or arg[-1] or arg[0]

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