Re: Overriding a pure print callback

[address@hidden]

On Dec 26, 2011, at 12:08 AM, Nicolas Sceaux wrote:

Hi,

I have in my tool box some overriden stencil functions, in particular
for bar lines (to define custom baroque repeat bars).

Now, some things seem to have changed since 2.15.20, with respect to
pure things, which show strange behavior when overriding the BarLine
stencil callback, with a function doing just the same thing:

\version "2.15.24"

#(define-public (bar-line::custom-print grob)
  (ly:bar-line::print grob))

\layout {
 \context {
   \Staff
   \override BarLine #'stencil = #bar-line::custom-print
 }
}

{ \key d \minor
 \time 3/4
 \set Score.skipBars = ##t
 R2.*8 \bar ":|" R2.*16 \bar "|." }

\version "2.15.22"

#(define-public (bar-line::custom-print grob)

  (ly:bar-line::print grob))

\layout {

 \context {

   \Staff

   \override BarLine #'stencil = #bar-line::custom-print

   \override BarLine #'Y-extent = #(ly:make-unpure-pure-container

     ly:grob::stencil-height

     (lambda (grob b e) (ly:grob::stencil-height grob)))

 }

}

{ \key d \minor

 \time 3/4

 \set Score.skipBars = ##t

 R2.*8 \bar ":|" R2.*16 \bar "|." }

Also, you can check out:

http://lilypond.org/doc/v2.15/Documentation/contributor/understanding-pure-properties

Cheers,

MS