Hi David & all,
2014-07-25 21:34 GMT+02:00 David Kastrup <d...@gnu.org>:
>
> Janek Warchoł <janek.lilyp...@gmail.com> writes:
>> 2) i didn't manage to get midi stuff done inside the same function as
>> the layout stuff - but i think that i'll be able to solve that if i
>> have a solution to 1).
>
> You basically need to collect just the context definitions and apply
> those (a context definition is applied by looking up its \name and
> overwriting the variable with that name).
>
> Frankly, I am tempted to create something like
> #{
> \output {
> \context ...
> xxx = 3\cm
> }
> #}
>
> that will either execute a number of assignments or alternatively return
> an anonymous lambda or define-void-function doing the same so that you
> can easily splice it into different output definitions.
>
> Something like that would apparently serve a need.
Ok, i reread what you wrote and now i understand that this is indeed
what i need :) So if you could write a function like this, i would be
very grateful (and i would happily increase your bounty!). My own
(_very_ naive) attempt at removing code duplication failed:
\version "2.19.10"
% Create a new xxxStaff and xxxVoice contexts with specified settings,
% derived from specified yyyStaff and yyyVoice contexts.
newInstrument =
#(define-scheme-function
(parser location name parent-name group-name staff-settings voice-settings)
(string? string? string? ly:context-mod? ly:context-mod?)
(let* ((staff-name (string-append name "Staff"))
(voice-name (string-append name "Voice"))
(parent-name (if (string=? parent-name "default") "" parent-name))
(parent-staff-name (string-append parent-name "Staff"))
(parent-voice-name (string-append parent-name "Voice"))
(common
#{
\context {
$(module-ref (current-module) (string->symbol group-name))
\accepts #staff-name
}
\context {
$(module-ref (current-module) (string->symbol parent-staff-name))
\name #staff-name
\alias #parent-staff-name
% is it possible to make it accept Voices of derived instruments?
\accepts #voice-name
\defaultchild #voice-name
#staff-settings
}
\context {
$(module-ref (current-module) (string->symbol parent-voice-name))
\name #voice-name
\alias #parent-voice-name
#voice-settings
}
#}))
(ly:parser-define! parser '$defaultlayout
#{ \layout #common #})
(ly:parser-define! parser '$defaultmidi
#{ \midi #common #})))
thanks again for your help!
Janek
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