Re: Aleatoric / modern notation

[David Nalesnik]

> On Sat, Nov 10, 2012 at 12:42 AM, David Kastrup <address@hidden> wrote:

>> That regression test tampered with internals of LilyPond in a manner
>> that broke session integrity (any changes propagated to further files
>> processed on the command line).  It likely still does.  The internals
>> changed in the mean time.

As a demonstration of the bleed-over between files processed on the
command line, the following file (let's say named
`frameEngraver4test.ly') will process without error if run with
'frameEngraver4.ly' on the command line:

lilypond frameEngraver4 frameEngraver4test.ly

The file:

\version "2.17.6"

frameStart =
#(make-span-event 'FrameEvent START)

frameEnd =
#(make-span-event 'FrameEvent STOP)

\relative c'' {
  \override Stem #'transparent = ##t
  \override Beam #'transparent = ##t
  \once \override Frame #'extender-length = #8
  \frameStart dis'8[ e f \frameEnd ges] s2
  \once \override Frame #'extender-length = #11
  \frameStart d,8[ e f \frameEnd g] s2
  \once \override Staff.BarLine #'X-extent = #'(+inf.0 . -inf.0) %
line can cross bar line
  s2
  \once \override Frame #'extender-length = #3.5
  \frameStart fis'8[ bes,, aes, \frameEnd e'']
}

\layout {
  \context {
    \Global
    \grobdescriptions #my-grob-descriptions
    #my-event-classes
  }
  \context {
    \Voice
    \consists \frameEngraver
  }
}