Hi Aaron,
The three forms
* \tempo 4 = 96
* \tempo Crazy 4 = 260-270
* \tempo "Sluggishly slow"
are hardcoded as variants into the parser. My guess is that this might
be hard (or impossible) to accomplish in a music function.
You just need to be a little creative.
That's what I hoped would happen. :-) If I understand it correctly, both
the genius and the drawback of your solution lies in having the user
write an explicit "\tempo" in order to invoke the parser's hard-wired
way of dealing with the possible syntax variants, right?
%%%%
\version "2.20.0"
#(define (tempo? arg)
(and (ly:music? arg)
(not (null? (extract-typed-music arg 'tempo-change-event)))))
Maybe I'm overly cautious, but I'd prefer this to be more specific so
that it accepts only actual "\tempo ..."-constructs. For example:
#(use-modules (scm display-lily)) #(define (tempo? arg) (and
(ly:music? arg) (string-startswith (music->lily-string test)
"\\tempo")))
This is probably an awful waste of computing effort, but I liked it
better than checking for the kind-of special internal structure of a
music expression containing only a \tempo (namely, a sequential-music
containing both a TempoChangeEvent and a PropertySet specced to context
Score.)
Lukas
