[Lilypond-auto] Issue 2887 in lilypond: [musicxml2ly] spurious staff

[lilypond]

Status: Accepted
Owner: ----
Labels: Type-Enhancement

New issue 2887 by address@hidden: [musicxml2ly] spurious staff
http://code.google.com/p/lilypond/issues/detail?id=2887

Reported by pls:
http://lists.gnu.org/archive/html/bug-lilypond/2012-10/msg00036.html

if an .xml file contains only <staff> elements with value "1" (i.e.
<staff>1</staff>) AND no <voice> element in a chorded note musicxml2ly
erroneously thinks that there are several staves. (I haven't tested what
happens when there are several <staff> elements with different values in an
.xml fle.

Test file:
https://www.dropbox.com/s/l9mt7iqd38lqqng/unwanted_staves.xml
The result is:

\new Staff <<
         \context Staff ="1" <<
             \context Voice = "PartPOneVoiceOne" { \voiceOne  
\PartPOneVoiceOne }
             \context Voice = "PartPOneVoiceNone" { \voiceTwo
\PartPOneVoiceNone }

This leads to a second unwanted empty staff.

Without any <staff> element in the .xml file the result is:

\new Staff <<
         \context Staff <<
             \context Voice = "PartPOneVoiceOne" { \voiceOne  
\PartPOneVoiceOne }
             \context Voice = "PartPOneVoiceNone" { \voiceTwo
\PartPOneVoiceNone }

and there is NO unwanted additional staff!

In this case musicxml2ly should be taught to ignore the <staff>-elements if
there is only one staff.