Re: [bounty] context generating function - how to get context def from its name?

[Janek Warchoł]

And the missing attachment.

2014-07-25 20:03 GMT+02:00 Janek Warchoł <address@hidden>:
> Hi all,
>
> i got stuck when working on a function that creates custom context
> definitions.  The idea is to have a function \newInstrument that would
> take a list of settings and create new customized xxxStaff and
> xxxVoice contexts - something like this:
>
> newInstrument =
> #(define-scheme-function
>   (parser location instrName parentName settings)(string? ly:context-mod?)
>   ;; ...
>     #{
>       \layout {
>         \context {
>           ;; create "instrNameStaff" context, derived from "parentNameStaff",
>           ;; with default child "instrNameVoice", and modifications specified
>           ;; in "settings" argument
>         }
>         \context {
>           ;; create "instrNameVoice" context, derived from "parentNameVoice",
>         }
>       }
>     #})
>
> As you can see, i want to be able to specify the "parent" instrument
> from which the new instrument will "inherit" settings.  For example, i
> want to define a "Vocals" instrument (=> VocalsStaff and VocalsVoice
> contexts, derived from Staff and Voice, respectively) and a "Soprano"
> instrument derived from "Vocals" (=> SopranoStaff and SopranoVoice
> contexts, derived from VocalsStaff and VocalsVoice, respectively).
>
> I managed to write a function that does something like this, but I
> have two problems:
> 1) inside the function, i don't know how to get a context definition
> from its name (i.e. from a string).  Right now i have to pass parent
> contexts' definitions as separate arguments, but this means that i
> have three arguments instead of one.
> 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).
>
> I offer €25 bounty for solving 1).  I may also offer a bounty for 2)
> if i won't manage to do it myself :)
> See the attachment for the code that i already have.
>
> best,
> Janek

new-instrument.ly
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