On 6/8/2021 10:11 PM, 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
Indeed. I'll make the test more robust (not come up with an error) but
as Wolfgang says, it won't work anyway because \doifmode is a protected
macro.
There is actually a trick:
\expand\doifmode{aaa}{on}
will ignore the protection .. compare
\edef\foo{\doifmode{aaa}{on}} [[\meaningless\foo]]
\edef\foo{\expand\doifmode{aaa}{on}} [[\meaningless\foo]]
only in luametatex/lmtx
Hans
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