On 8/20/2016 4:49 PM, Frank Mittelbach wrote:
Am 20.08.16 um 15:43 schrieb Joseph Wright:
[..]
(and similar for other engines) whilst LuaTeX gives respectively
This is LuaTeX, Version 0.95.0 (TeX Live 2016)
restricted system commands enabled.
(./test.tex
(./test.tex
))
warning (pdf backend): no pages of output.
Transcript written on test.log.
and
This is LuaTeX, Version 0.95.0 (TeX Live 2016)
restricted system commands enabled.
(./test.tex (./test.tex))
warning (pdf backend): no pages of output.
Transcript written on test.log.
Is there some logic to the variation here?
I think there is not much you can do here other than accept the
differences (and expect more in the future)
and somehow program around it.
In the 20 years regression testing for LaTeX I remember several
occasions where spaces popped up in new places (or linebreaks) when a
new release of web2c was released. This is the same thing and as Hans
said, lua code will interrupt things and so start new lines in places.
It is a bit surprising that there is a lot of space differences between
batch and scroll mode but ...
would be nice if there are less, but it is fairly clear that the
different engines will behave differently here as this is not something
that matters except when trying to parse the .log file
Guess you need to normalize by hunting for ) as the first char in a line
combine it with the previous line and then see how far that gets you
maybe it helps to know that there are
- tex messages and errors: these go through the more or less traditional
machinery, but spaces and newlines can creep in as a side effect of
linebreaks (max length, utf etc); some extended mechanisms can output a
bit more in tracing
- backend (or subsystem) warnings and errors: in pdftex/xetex some might
come from kpse, some from third party libraries, some from within but in
luatex most of them are normalized (which took a bit of time / effort),
so where the pdftex backend can report "bla bla" luatex will often
report "category: bla bla"; some harmless errors became warnings and
some warnings became errors, so that also can be different); for too
isolated libraries one can expect anything in terms of messages but
normally it's then a fatal error anyway
Hans
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