Re: [SPAM] Re: Tweaking in scheme

2015-06-29 Thread David Kastrup 
Peter Gentry peter.gen...@sunscales.co.uk writes:

-Original Message-
From: David Kastrup [mailto:d...@gnu.org] 

One can also try to do this kind of iteration oneself in order 
to only use the less invasive tweaks and get the color covered:

\version 2.19.22
tweakIV =
#(define-music-function (music) (ly:music?)
   (map-some-music
 (lambda (m)
   (and (music-is-of-type? 'note-event)
(tweak 'color red (tweak 'style 'harmonic m
 music))

If version 2.19.22 is not available, one can retain the 
parser/location arguments and replace the (tweak ...) line by 
the core of any of Harm's proposals.  map-some-music has been 
available since 2.16.0 at least, and all the rest for longer.

 Thanks for that I have downloaded 2.19.22 for even more fun

Well, people got used to the entrails of LilyPond hanging all over their
code for the last dozen years or however long music functions existed.

But the road to working with Scheme is less yucky if one can keep them
out of sight until needed.

And (tweak 'color red (tweak 'style 'harmonic m))
beats having to write

((ly:music-function-extract tweak) parser location 'color red
  ((ly:music-function-extract tweak) parser location 'style 'harmonic m))

even though the latter was likely faster since it did not bother
checking the arguments for correctness.  But I don't actually think any
user-level code ever used ly:music-function-extract: people either used
#{...#} once it was powerful enough for that, or manually emulated
whatever the music function did.

-- 
David Kastrup

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Re: [SPAM] Re: Tweaking in scheme

2015-06-29 Thread David Kastrup 
David Kastrup d...@gnu.org writes:

 Peter Gentry peter.gen...@sunscales.co.uk writes:

-Original Message-
From: David Kastrup [mailto:d...@gnu.org] 

One can also try to do this kind of iteration oneself in order 
to only use the less invasive tweaks and get the color covered:

\version 2.19.22
tweakIV =
#(define-music-function (music) (ly:music?)
   (map-some-music
 (lambda (m)
   (and (music-is-of-type? 'note-event)

Yikes.  Of course (music-is-of-type? m 'note-event) here.

(tweak 'color red (tweak 'style 'harmonic m
 music))

-- 
David Kastrup

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RE: [SPAM] Re: Tweaking in scheme

2015-06-29 Thread Peter Gentry 
 

-Original Message-
From: David Kastrup [mailto:d...@gnu.org] 
Sent: Monday, June 29, 2015 12:40 PM
To: Thomas Morley
Cc: Peter Gentry; lilypond-user
Subject: [SPAM] Re: Tweaking in scheme

Thomas Morley thomasmorle...@gmail.com writes:

 How about:

 \version 2.19.21

 %% regard output of:
 \displayMusic
 { \tweak style #'harmonic a'1 }

 tweakI =
 #(define-music-function (parser location music)(ly:music?)
   (ly:music-set-property! music 'tweaks
 (acons 'style 'harmonic
   (acons 'color red
 (ly:music-property music 'tweaks
   music)

 { \tweakI a'1 }

 %% or:

 tweakII =
 #(define-music-function (parser location music)(ly:music?)
   #{
 \tweak color #red
 \tweak style #'harmonic
 $music
   #})

 { \tweakII a'1 }

As 2.19.22 is now available for download, let me smugly suggest:

\version 2.19.22
tweakIII =
#(define-music-function (music) (ly:music?)
  (tweak 'color red
(tweak 'style 'harmonic music)))

However, like all of the previous proposals, this relies on music
being a single tweakable item.  For noteheads, there is the 
more thorough style-note-heads function employed by 
\harmonicNote, so this part could be done by (harmonicNote 
music) instead (\harmonicNote uses a tweak for a single note 
and override/revert for everything else).

One can also try to do this kind of iteration oneself in order 
to only use the less invasive tweaks and get the color covered:

\version 2.19.22
tweakIV =
#(define-music-function (music) (ly:music?)
   (map-some-music
 (lambda (m)
   (and (music-is-of-type? 'note-event)
(tweak 'color red (tweak 'style 'harmonic m
 music))

If version 2.19.22 is not available, one can retain the 
parser/location arguments and replace the (tweak ...) line by 
the core of any of Harm's proposals.  map-some-music has been 
available since 2.16.0 at least, and all the rest for longer.

--
David Kastrup

Thanks for that I have downloaded 2.19.22 for even more fun


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