Re: Scheme / Lilypond question

[Simon Albrecht]

On 06.01.2017 21:26, Jay Vara wrote:
> 1) Is it possible to define a variable as a piece of music:
>
> jj = g16 \3 ( f e f)

Of course it’s possible – there’s no way engraving reasonably large 
scores without that! The only thing you need to change from your example 
is wrap the notes in {} to create sequential music. Else the variable jj 
will contain only { g16\3 } and the rest of the notes will raise errors 
from the parser.

> The idea is, in the music I am working on the note F is sometimes 
> replaced by the above [and similarly other notes]. Perhaps a scheme 
> function may be needed for this?

You might do this using scheme, but you don’t need to: just use tags 
like follows:

%%%%%%%%%%%%%%%%%%
\version "2.19.53"

% use this to prevent interference with already used tags
\tagGroup unembellished,embellished

jj = { \tag unembellished f'4 \tag embellished { g'16\3( f' e' f') } }

\score {
  \keepWithTag <<
    \jj
    \addlyrics { foo }
  >>
}

%%%%%%%%%%%%%%%%%%

> 2) When I am specifying the guitar string the note is to be played on, 
> it turns out I need to specify it for each and every note. Is there a 
> way to specify it easily? Say,
>
> StrThree { g16 (f e f)} would mean all the notes should be played on 
> string three.

Yes, there is a way. Though I’d advise you to spell it out, maybe using 
the help of an editor. That way you keep your source code more 
standard-compliant and easier to read for both humans and e.g. syntax 
highlighting algorithms.
For example, I have taken to spelling out staccatos instead of applying 
the music function from an LSR snippet, which adds staccatos to all the 
contained notes. Frescobaldi helps me doing that with its ‘Quick insert’ 
tool.
However, I don’t think there is a ‘Quick insert’ for string numbers yet 
– you might want to submit a feature request at 
<https://github.com/wbsoft/frescobaldi/issues>.

HTH, Simon