Things seem not as simple as you suggest, at least on luatex 1.13.2.
In next example, synctex_tag and synctex_line both survive the first \directlua
call, so the state is not gone, which is a good thing
\directlua{
tex.set_synctex_tag(99)
print(tex.get_synctex_tag())
tex.set_synctex_tag(199)
tex.set_synctex_line(299)
print(tex.get_synctex_line())
tex.set_synctex_line(399)
}
\directlua{
print(tex.get_synctex_tag())
print(tex.get_synctex_line())
}
\bye
In next example where \directlua is called from a macro, synctex_line survives
the call but not synctex_tag.
So some part of the state is gone, which is not practical.
\def\Setter{
\directlua{
tex.set_synctex_tag(99)
print(tex.get_synctex_tag())
tex.set_synctex_tag(199)
tex.set_synctex_line(299)
print(tex.get_synctex_line())
tex.set_synctex_line(399)
}
}
\Setter
\def\Getter{
\directlua{
print(tex.get_synctex_tag())
print(tex.get_synctex_line())
}
}
\Getter
\bye
> Le 28 mars 2022 à 14:40, Hans Hagen <j.ha...@xs4all.nl> a écrit :
>
> On 3/28/2022 1:32 PM, Jérôme LAURENS wrote:
>> I do not really understand what is the relation with macro packages and _
>> because it is just raw luatex.
> depends. i've seen it being an active character; anyway,
>
> \directlua{
> tex.set_synctex_tag(99)
> print(tex.get_synctex_tag())
> tex.set_synctex_tag(199)
> print(tex.get_synctex_tag())
> }
>
> does what it is supposed to do: sets the tag of the current input and reports
> the tag of the current input and every \directlua pushed the stack so after
> such a call that state is gone
>
> Hans
>
>
> -----------------------------------------------------------------
> Hans Hagen | PRAGMA ADE
> Ridderstraat 27 | 8061 GH Hasselt | The Netherlands
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