Re: Proposed new available and recommended behavior of \relative

[Wim van Dommelen]

On 10 Mar 2013, at 10:06 , David Kastrup wrote:

> Wim van Dommelen <address@hidden> writes:
>
> > Agree, we should have an easy way to switch from absolute to relative
> > (Yes, everthing inside \relative { } is relative, all other is
> > absolute, I know), like: \absolute: from here on everything is
> > absolute like \clef bass tells me: from here on display everything in
> > the bass clef.
>
> Barely tongue-in-cheek:
>
> absolute =
> #(define-music-function (parser location music) (ly:music?)
>   (make-music 'TransposedMusic 'element music))
>
> When placed inside of a \relative block, \relative will route around
> this music.  It stays in absolute pitch and does not even touch the
> reference pitch of \relative.  This might be somewhat useful in
> connection with music variables:
>
> melody = \absolute { c'4 e' g' c' }
>
> \relative f { c''4. g'8 c,2 \melody d4 e f c }

Not quite what I had in mind, this is still using a "wrap" with { }

Compared with the \clef behaviour, I see this variant:

melody = { \relative c='4 d e f g f e d c \absolute c,, d,, e,, f,,  
g,, \relative c=' d e f }

The { } only wrap the notes for the variable to be defined. The  
sequence switches from a relative section based on the c=', then to  
absolute notes and then back to relative again. See it as switching to  
another state of mind, no { } with the \relative needed. \clef  
switches to another clef without the need to wrap the rest of your  
music in curly brackets.

mixedclefabsolute = { \absolute \clef bass c4 d e f g a b \clef treble  
c' d' e' f' g' a' b' c'' }

> If you wrote just
>
> melody = { c'4 e' g' c' }
>
> here, things would go rather haywire.

True :-(, but I would probably say:

melody = { \absolute c'4 e' g' c' }

which should hold in any copy&paste, transpose, etc.

> --
> David Kastrup
>
>
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