Phil Holmes writes:
> There are currently two problems (alignment discussion notwithstanding and
> which I'm not ignoring, but would prefer to park temporarily) with my
> proposed incipit code. 1) If indent is not set explicitly in the \layout
> block, it throws an error; 2) If instrumentName is not set explicitly in
> the score containing the incipit, no incipit is output.
>
> For 1), the optimum answer would apppear to be to check whether indent has
> been set, and if it hasn't, set it to the value of indent-default which is
> set in paper-defaults-init.ly as "indent-default = 15\mm". However,
> trying to access that variable fails: "test = \indent-default" results
> in "error: unknown escaped string: `\indent-default'". Does anyone know
> why this is and whether there's an alternative way to access that variable
> value?
>
> If it's not possible to get the value, we could set a variable to what we
> know its value to be, and then use that. The following code works:
>
> indent-incipit-default = 15\mm
> line-width = #(primitive-eval
> '(or (false-if-exception (* 1.0 indent))
> (* 1.0 indent-incipit-default)))
>
> But all those (* 1.0 variable) lines aren't pretty, but I don't know
> better syntax. Would appreciate help here.
Just indent and indent-incipit-default (strip the parens off) should
work actually.
> For 2), the only solution I know is that we would have to add 'Note that
> instrumentName must be set in the music for the incipit to be produced.
> If no instrument name is required then use \set Staff.instrumentName =
> #""' in the documentation. Is there a better solution?
This is so much a royal pain to get stuff passed properly. How do we
fare when things like choir brackets get involved? If that would result
in unacceptable output, it would be a good excuse to rework
Instrument_name_engraver or whatever else is needed on the C++ level to
get a saner hook of incipits into the code.
--
David Kastrup
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