Simon Albrecht <simon.albre...@mail.de> writes:
> On 19.05.2016 03:23, David Wright wrote:
>> \layout {
>> \context {
>> \Staff
>> \override StaffSymbol.break-align-symbols = #'(time-signature
>> key-signature staff-bar break-alignment)
>> }
>> }
>
> I tried to use the proper LilyPond list syntax here:
> \override StaffSymbol.break-align-symbols =
> time-signature,key-signature,staff-bar,break-alignment
> – which would be beautiful, but the parser doesn’t expect it
> there. Could that be made working, David?
Override arguments are not type-checked at parsing time, so the syntax
cannot be adopted according to the accepted type. The situation is
similar for \tweak: while it is a music function, its value type cannot
be changed on-the-fly depending on the name of the preceding symbol: it
is always scheme? .
If we require lookahead for _any_ string matched by a generic predicate
like scheme? in order to see whether there is a "," following maybe, and
then convert what started out as a symbol into a list of symbols, a lot
of syntax will behave more weirdly.
Giving \override type-sensitive syntax without being able to do so for
\tweak would be highly inconsistent, and the current music function
argument processing does not allow us to calculate a symbol-list?
predicate after having seen the incomplete argument list of
\tweak StaffSymbol.break-align-symbols .
So no. It cannot reasonably be made to work like you want, but you can
define a music function for overriding break-align-symbols specifically
and give that function an argument type of symbol-list? (which obviously
means that you cannot use the \etc shortcut).
--
David Kastrup
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