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Re: Key Signature name in Markup

From: Thomas Morley
Subject: Re: Key Signature name in Markup
Date: Mon, 2 Apr 2018 02:45:34 +0200

2018-04-01 22:25 GMT+02:00 brob2684 <address@hidden>:
> Thomas Morley-2 wrote
>> 2018-03-31 22:55 GMT+02:00 brob2684 <
>> bennrobertson@
>> >:
>>> Is it possible to extract the name of the first key signature in a piece
>>> (single staff) after adjusting for any transposition to use in text
>>> markup?
>>> (e.g. looking to get the phrase "C major" if there is no key signature
>>> before the first note (i.e. default key)).
>>> I have come across, but have no
>>> idea
>>> where to even begin modifying it (some of the changes are obvious - I can
>>> tell I don't need the rescaling bits, but I don't know enough
>>> scheme/lilypond internals to work out how to change it to give me just
>>> text).
>> Hi,
>> obviously I don't understand what you want.
>> Could you explain why the lsr-snippet doesn't fit your needs?
>> May be some (not working) pseude-code with the syntax you want to use
>> may be helpful as well.
> The snippet works insofar as it gives me the name of each key signature,
> which is very close to what I want. However, I'm only interested in storing
> the name of the first key in the piece in a variable to use in text later,
> rather than displaying the name of each key when the key signature changes.
> I can deduce that the last three lines of the snippet (below) are
> responsible for printing the name of the key signature above the stave at
> each key change.
>             (ly:grob-set-property! grob 'stencil
>               (ly:stencil-combine-at-edge key-sig-stencil 1 1
>                 key-name-scaled padd))
> What I would like to do is change this somehow to set a variable to the "key
> signature name".
> I suspect what I need to do is remove the three lines above and replace them
> with some sort of command that first tests whether the "key signature name"
> variable been set; if yes then do nothing (to prevent overriding the
> variable), else set the "key signature name" variable to the name of the key
> signature.
> At some later point in markup, I'd like to be able to reference the "key
> signature variable", e.g.
> melody = \relative c'' {
>   \time 4/4
>   c1 \key d \major d \key e \major e \key f \major f
> }
> \score {
>     \new Staff { \melody }
> }
> \markup { Some text later that states that the first key in the piece is in
> *\key_signature_name* }
> and have the text say "Some text later that states that the first key in the
> piece is in *C major*".


thanks for clarification.

I thought a bit about it and I think it might be possible to store the
initial key-signature-name and let TextScript get this name under
certain conditions.
Though, what to do if _no_ KeySignature is present?
Could be c-major or a-minor or e-phrygian or maybe nothing of it but
rather dodecaphonism or ...
How to decide?

Best would be to output something like "no KeySignature present", imho.

What do you think?


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