On 6/8/2021 16:11, Wolfgang Schuster wrote:
Rik Kabel schrieb am 08.06.2021 um 18:14:
Hello all,
Odd issue with LMTX (works fine with --luatex). \doifelsemode causes
a failure if it is used to set a simple value such as on, off, yes,
no, ..., but works with a dimension. Perhaps better illustrated by an
example:
\definemode [aaa]
[keep]
\setuplayout [
marking=\doifmodeelse{aaa}{off}{on},
% marking=on,
grid=\doifmodeelse{aaa}{yes}{no},
% grid=yes,
bottom=\doifmodeelse{aaa}{10mm}{20mm},
]
\starttext
This is only a test.
\stoptext
The problem occurs whether or not the mode is enabled. In the
example, it fails with the mode test in the either the marking= or
grid= keys, but has no problem with it in the bottom= key.
The error message says:
The control sequence marked <to be read again> should not appear
between \csname and \endcsname.
pointing to the enabled \doifmodeelse line.
The same issue occurs with the following, using \doifmode:
\definemode [aaa]
[keep]
\setuplayout [
marking=on,
marking=\doifmode{aaa}{off},
]
\starttext
This is only a test.
\stoptext
This did work without complaint a few months ago.
You can never be sure if these combinations (\doifXXX within
\setupXXX) work without problems. The only reliable method in this
case is:
% default setup
\setuplayout
[marking=on]
% mode dependent setup
\startmode[aaa]
\setuplayout
[marking=off]
\stopmode
Wolfgang
Yes, that works. Of course, to say that you can never be sure if such
combinations will work is not a welcome statement about the state of
ConTeXt.
More recent LMTX releases also now break older documents that worked
(with LMTX and MkIV) before. If there is an error in what was previously
written that is only noticed because of tighter enforcement, that is one
thing, but an undocumented change to supported behaviour is less to be
desired. And that it works with dimensions but not on/off/yes/no is very
strange and suggests some other problem may be lurking.
--
Rik
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