Hi Werner,
IIRC these assignments in \paper and \layout and \header blocks are
functionally equivalent to defining a variable in Scheme like
#(define left-margin 100)
(omitting the unit here for simplicity).
The kind of \unset you’re asking for requires the previous value to have
been saved onto some stack, which I doubt exists/is accessible here.
Maybe you could work around by calculating left-margin and right-margin:
\paper {
left-margin = #(/ (- paper-width line-width) 2)
right-margin = #left-margin
}
Best, Simon
On 02.08.19 10:45, Werner LEMBERG wrote:
I wonder whether it is possible to use \unset in the paper block. The
use-case is lyluatex, which sets `left-margin'; I want to unset this
value so that lilypond only takes the line width into account to
automatically center it.
In other words, I would like to have
% from lyluatex
\paper {
left-margin = 100\pt
line-width = 200\pt
}
...
% user code
\paper {
\unset left-margin
}
Werner
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