Re: Invisible notes, Scheme contexts

[Don Blaheta]

Quoth Han-Wen Nienhuys:
> Don Blaheta wrote:
> > 2) Is there a Scheme function to retrieve the _current_ context?  It
> > looks like all the functions require a context as an argument.
> 
> What do you mean by "current" ? Where do you need it ?

The context that is enclosing the point where the Scheme function is
called.  I guess it's probably in the location variable that is the
second argument to a music-function, but I'm not sure how to access it
from there.

I'm actually particularly interested in getting the id of the current
context, so I can store it in a variable and use the value of that
variable later.  I've also been having trouble typing in such an id
literally; if I define a music function like 

  foo = #(def-music-function (parser location str) (string?)
          #{ \context Voice = $str { \override NoteHead #'font-size = #3 } 
          #})

and then include in my code

  \foo "blah"

I get an error 

  funcs.ly:26:14: error: syntax error, unexpected STRING, expecting SCM_T or 
SCM_IDENTIFIER
      \foo "blah
                "
  error: errors found, ignoring music expression

I can't figure out how to convert between Scheme strings and the
lilypond-native things that look like strings but seem to be something
else (often a LYRICS_STRING, though not in this case).

(Again, all on 2.6.4 on MacOS.)

-- 
-=-Don address@hidden<http://www.blahedo.org/>-=-
The streets are safe in Philadelphia. It's only the people who make them
unsafe.         --Frank Rizzo, ex-police chief and mayor of Philadelphia