Re: Difference between # and $

[Phil Holmes]

----- Original Message ----- 
From: "David Kastrup" <address@hidden>
To: "Phil Holmes" <address@hidden>
Cc: "Urs Liska" <address@hidden>; <address@hidden>
Sent: Monday, March 31, 2014 2:44 PM
Subject: Re: Difference between # and $


> "Phil Holmes" <address@hidden> writes:
>
> > I've read
> > http://lilypond.org/doc/v2.19/Documentation/extending/lilypond-scheme-syntax
> > (as no doubt, Urs has) and tried to use $ in place of #.  Can't get it
> > to compile.  So, taking the following note doubler, how would $ be
> > used instead of #?
> >
> > dubble = #(define-music-function( parser location arg )
> >  (ly:music?)
> >  #{ $arg $arg #}
> > )
> >
> > { c'' \dubble c' }
>
> Huh?  Which # would you even want to replace here?  #{ ... #} is inside
> of Scheme.  $arg already uses a $.
>
> This code works fine as written.

Er - yes.  I know it works fine.  I ran it.  However, the page I refer to 
above says "Another way to call the Scheme interpreter from LilyPond is the 
use of dollar $ instead of a hash mark for introducing Scheme expressions". 
So my presumption was that "#(define-music-function" is "a hash mark for 
introducing Scheme expressions" and could be replaced by a $.  But if I do 
that, it fails to compile.

--
Phil Holmes