Issue 529 in lilypond: hooks desired (ie fall/doit that happens before a note)

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Issue 529: hooks desired  (ie fall/doit that happens before a note)
http://code.google.com/p/lilypond/issues/detail?id=529

New issue report by gpermus:
Hooks are used in Baroque notation; the scan is from Bach Anna Magdalena.

They appear, for example in Bach BWV 691 measures 3 and 4.
I've been making them from an appoggiatura with the grace note blanked out,
but it typically takes some tweaking to make the hook look right.

Here's an example of the workaround, but as you can see it's quite messy.

\version "2.10.25"
\layout { ragged-right = ##t }

\relative c'
{
 fis16 \noBeam
 \once \override Score.SeparationItem #'padding = #2
 \once \override Slur #'extra-offset = #'( -0.75  . 1.5 )
 \hideNotes
 \appoggiatura a16 % 'a' was chosen to get the right shape
                   % for the hook,
                   % not to indicate the pitch of the
                   % appoggiatura.
 \unHideNotes
 e8

 d'16 \noBeam
 \once \override Score.SeparationItem #'padding = #1.5
 % Lilypond makes a big slur to curve under the sharp sign,
 %but it doesn't look right as a hook.
 % So we set the control points explicitly.
  \once\override Slur  #'control-points = #'((0 . .5) (.2 .
  -.3) (.7 . -0.7)
(1.5 . -.8))
  \hideNotes
  \appoggiatura a16
  \unHideNotes
  gis8.
}


Attachments:
        Bach-AnnaMagdalena1725-25.jpg  46.4 KB
        Palmer-9.jpg  95.5 KB
        foo.preview.png  2.2 KB


Issue attributes:
        Status: Accepted
        Owner: gpermus
        Labels: Type-Enhancement Priority-Low

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