Re: Abbreviations

[Mattes]

Am Freitag, 03. April 2015 20:15 CEST, Urs Liska <address@hidden> schrieb:

>
>
> Am 03.04.2015 um 19:45 schrieb Kevin Barry:
> >
> > On Fri, Apr 3, 2015 at 2:23 PM, Urs Liska <address@hidden
> > <mailto:address@hidden>> wrote:
> >
> >     I'll note that for explaining in a blog post because it seems like
> >     a good example for demonstrating the relation between Scheme and
> >     LilyPond variables and the role of symbols.
> >
> >     Maybe it fits into a post I've just started to plan (explaining
> >     what "#(define-music-function" actually means).
> >
> >
> > I would be very interested to read it. I have figured out over time
> > what kind of things tend to work and which things don't (when it comes
> > to variables and substitution) but I don't always understand why, for
> > example `t = \tuplet' doesn't work, but `#(define t tuplet)' does.

Well, think of it like this (slightly oversimplified):

 'tuplet' is a lilypond function, '\' will _call_ this function.
Let's quickly check that:

  guile> tuplet
    #<Music function #<procedure #f (parser location ratio tuplet-span music)>>

If you do '#(define t tuplet)'  't' will have the same value as 'tuplet':

 guile> (define t tuplet)
 guile> t
   #<Music function #<procedure #f (parser location ratio tuplet-span music)>>

If you write:

 t = \tuplet

't' would have the value of calling 'tuplet' .

 HTH RalfD

> I've started writing the post today, and it may well be that it fits in.
> But I'll have to figure out if I've understood it fully myself (or if I
> manage to do so during the process of writing ...).
> If it doesn't fit it would also be a good topic for an individual post.
> Nothing bad with having some shorter posts in between ...
>
> Best
> Urs