On Thu, Sep 15, 2011 at 3:16 PM, David Kastrup <d...@gnu.org> wrote:
> Michael Ellis <michael.f.el...@gmail.com> writes:
>
> > I've written some music functions I use frequently to operate on
> > lyrics. For example, there's one call "lacc" that allows me to
> > intermix lyrics and notation by accumulating the lyrics into a list I
> > can instantiate later in the \score block. Very nice and convenient,
> > but the usage is a little messy:
> >
> >
> > \lacc \lyricmode { This is a ly -- ric line. }
> > c4 d e f | g a
> >
> > \lacc \lyricmode { Here is the next. }
> > b c | d c2. |
> >
> > Normally, I deal with the messiness by defining a keystroke macro in
> > my editor that wraps a line of bare text in the necessary commands and
> > braces. I now find myself (skipping a long story) needing to work
> > in an environment where keystroke macros will not be available.
> >
> > Is it possible to define a music function that will do the work of my
> > keystroke macro? Ideally I'd like to be able to write in an input
> > file something like
> >
> > \lyr This is a lyric line
> >
> > and have LilyPond do the rest, but none of my attempts thus far have
> > worked.
>
> The arguments of a music function are parsed before it is called, so
> no. However, if you already are in lyrics mode, you can pick up the
> music in that manner. You may also think about doing
>
> \lacc " This is a lyric line "
>
> and then using ly:parser-parse-string to pick up lyricmode expressions.
> It might be nice at one point of time to be able to call #{ \lyricmode
> \somefunction-taking-a-music-argument #} or similar trickery, but this
> kind of closure is not available yet.
>
> Thanks, David. I figured it must be a parsing issue so it's nice to have
it clarified by someone knowledgable. I like the ly:parser-parse-string
idea. Does that function return a music object if the parsing is
successful?
Would it work to have my \lacc function massage the string so that it
becomes
"\lyricmode { This is a lyric line }"
and then call ly:parser-parse-string to return the result?
For reference (and in case someone else might find it useful) here is the
complete set of functions I currently have:
%% --------------------------------------------
#(define (make-music-accumulator)
(define acc '())
(define (add lyr)
(set! acc (append acc lyr)))
(define (get) acc)
(define (interface op . rest)
(cond
((eq? op 'add)
(add (car rest)))
((eq? op 'get)
(get))
(else (error "Undefined operation"))))
interface)
#(define defaultLyricAccumulator (make-music-accumulator))
lacc =
#(define-music-function (parser location music) (ly:music?)
"For accumulating lyrics mixed with notation"
(defaultLyricAccumulator
'add
(ly:music-property music 'elements))
(make-music 'SequentialMusic 'void #t))
getLyrics =
#(define-music-function (parser location) ()
"for retrieving accumulated lyrics."
(make-music
'SequentialMusic
'elements
(defaultLyricAccumulator 'get)))
%% --------------------------------------------
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