Germain G. Ivanoff-Trinadtzaty wrote:
> Hello,
>  
> I've got two problems defining a new context \StaffSA, based on \Staff.

Your code below defines a new context type StaffSA which does not 
contain any
engravers and it's not based on the Staff context type (the description 
in the manual of
what \alias does is very simplified and it seems that you have 
misinterpreted it).

Unfortunately, there is no good explanation anywhere in the manual on 
how to make a
new context type based on an existing one. However, you can find some 
examples
in the mailing list archives, for example 
http://lists.gnu.org/archive/html/lilypond-user/2008-02/msg00837.html
I also recommend you to take a look at the file ly/engraver-init.ly, 
where all the
default contexts are defined. For example, if you look at the definition of
the PianoStaff context, you will see how to base a new context definition
on an already existing one.

What is it really that you try to obtain? What should the new context 
type do that
Staff doesn't?

   /Mats

> I followed instruction from NR 6.2.5 Defining new contexts.
> http://lilypond.org/doc/v2.11/Documentation/user/lilypond/Defining-new-contexts#Defining-new-contexts
>  
> With the definitions that follow :
> 1) I get two staves for one  \new \StaffSA
> 2) their instrumentName don't print
>  
> What's wrong ?
>  
> Thanks,
> Germain
>  
> ps: btw, are de sharps (#) well suited ? (i mean : in the right place ?)
>  
> at : "test-newcontext.png"
>  
> %% Test de définition d'un nouveau contexte
>  
> \version "2.11.47"
> \include "english.ly"
>  
> Global = { \key f \major }
> NotesDiscantus = { a'4 a'1 }
> NotesCantus =  { f'4 f'1 }
> NotesFiller =  { c'4 c'1 }
> NotesBassus =  { f4 f1 }
> Words = \lyricmode { Ta __ daa }
>  
> %---------------%
> StaffVoiceNames =  %% for Staff context
> #(define-music-function  (parser location n-max-width s-one s-two)
>                          (number? string? string?)
>   "Format and print voice names for one staff"
>   #{
>    \set Staff . instrumentName = \markup { \column {
>             \hcenter-in #$n-max-width $s-one
>             \hcenter-in #$n-max-width $s-two } }
>   #})
> %---------------%
> StaffSAVoiceNames =  %% same as above, but for StaffSA context
> #(define-music-function  (parser location n-max-width s-one s-two)
>                          (number? string? string?)
>   "Format and print voice names for one staff"
>   #{
>    \set StaffSA . instrumentName = \markup { \column {
>             \hcenter-in #$n-max-width $s-one
>             \hcenter-in #$n-max-width $s-two } }
>   #})
> %---------------%
> \layout % commun
> {
>  \context { \Score
>             \remove  Bar_number_engraver }
>  \context { \ChoirStaff  %% si placé après déf. de StaffSA : idem
>             \consists Instrument_name_engraver
>             \override InstrumentName #'self-alignment-X = #LEFT
>             \accepts  StaffSA }
>  \context { \Staff
>             \remove   Time_signature_engraver
>             \override InstrumentName #'self-alignment-X = #RIGHT }
>  \context { \name  StaffSA
>             \type  "Engraver_group"
>             \alias Staff }
> }
> %---------------%
> \score % 1
> {
>  \new ChoirStaff
>  <<
>   \set ChoirStaff . instrumentName = "N°1 Strange behaviour :"
>   
>   \new StaffSA
>   <<
>    \StaffSAVoiceNames #3 #"S." #"A."  %% ne donne rien
> %   \StaffVoiceNames #3 #"S." #"A."    %% ne marche pas non plus
>    \clef "G" \Global
>    \new Voice = "one" { \voiceOne \NotesDiscantus }
>    \new Voice         { \voiceTwo \NotesCantus }
>   >>
>  
>   \new Lyrics = thewords { s }
>  
>   \new Staff
>   <<
>    \StaffVoiceNames #3 #"T." #"B." 
>    \clef "F" \Global
>    \new Voice { \voiceOne \NotesFiller }
>    \new Voice { \voiceTwo \NotesBassus }
>   >>
>  \context Lyrics = thewords \lyricsto "one" { \Words }
>  >>
>  \layout { indent = 65\mm }
> }
>
> ------------------------------------------------------------------------
>
> ------------------------------------------------------------------------
>
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> lilypond-user <at> gnu.org
> http://lists.gnu.org/mailman/listinfo/lilypond-user
>   

-- 
=============================================
	Mats Bengtsson
	Signal Processing
	School of Electrical Engineering
	Royal Institute of Technology (KTH)
	SE-100 44  STOCKHOLM
	Sweden
	Phone: (+46) 8 790 8463				
        Fax:   (+46) 8 790 7260
	Email: mats.bengtsson <at> ee.kth.se
	WWW: http://www.s3.kth.se/~mabe
=============================================