On 24/12/2018 08:34, Henri Menke wrote:
Dear devs,
LuaTeX somehow garbles special tokens when printing to the log using
\show. For example when you define a macro with active end of lines,
I'd expect ^^M to be printed in the log. However, LuaTeX replaces ^^M
with \r, mashing all the lines together into one.
Consider the follwing MWE:
\begingroup
\obeylines
\gdef\lines{
Hello LuaTeX!
Why do you garble newlines in
terminal output?
}
\endgroup
\show\lines
\bye
------------------------------------------------
Here is the log with pdfTeX.
------------------------------------------------
$ pdftex test.tex
This is pdfTeX, Version 3.14159265-2.6-1.40.19 (TeX Live 2018)
(preloaded format=pdftex)
restricted \write18 enabled.
entering extended mode
(./test.tex
\lines=macro:
->^^MHello LuaTeX!^^M^^MWhy do you garble newlines in^^Mterminal output?^^M.
l.11 \show\lines
?
)
No pages of output.
Transcript written on test.log.
------------------------------------------------
And here is the log with LuaTeX.
------------------------------------------------
$ luatex test.tex
This is LuaTeX, Version 1.09.0 (TeX Live 2019/dev)
restricted system commands enabled.
(./test.tex
\lines=macro:
.erminal output?e newlines in
l.11 \show\lines
?
)
warning (pdf backend): no pages of output.
Transcript written on test.log.
------------------------------------------------
Cheers, Henri
This is by-design: see page 12 of the current manual:
Output to the terminal uses ^^ notation for the lower control range (𝑐
< 32), with the exception
of ^^I, ^^J and ^^M. These are considered ‘safe’ and therefore printed
as-is.
For l3build (which uses log comparison), we do a sweep over the log to
turn returns into ^^M to get 'closer' to pdfTeX for exactly this reason.
Joseph
