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Re: Add function for overriding broken spanners to LilyPond. (issue 6397

From: David Kastrup
Subject: Re: Add function for overriding broken spanners to LilyPond. (issue 6397054)
Date: Fri, 20 Jul 2012 14:30:19 +0200
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/24.1.50 (gnu/linux)

David Nalesnik <address@hidden> writes:

>     scheme? always returns #t.  At the current point of time, the only
>     argument predicates specially coded into the parser are ly:pitch?
>     and ly:duration? so they don't mix with scheme?
>     syntactically.  This will at some point of time get removed as
>     well.  It is just somewhat tricky to do.
>     The advantage of not special-casing argument predicates is that
>     you can write predicates markup-or-music? or number-or-markup? and
>     similar, and they will work fine.  It is just pitches and
>     durations that have been somewhat resistant against this
>     unification.
> Thanks very much for your explanations.  This is much clearer to me
> now.

I am currently giving another pitch at removing the strangenesses in
pitch/duration treatment as well as the limitations about using simple
music after a skipped optional argument.

If the semantics are too complex for the likes of Harm and you to deal
with unaided, they are not user-accessible.  Which would defeat one of
the major points of moving that kind of thing into the power of music
functions rather than keeping it hardwired in the parser tied to
particular reserved words.

David Kastrup

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