Re: Need help with Scheme code

[Aaron Hill]

On 2019-12-17 6:01 pm, Paolo Prete wrote:
> And thanks again to the Scheme-master Aaron.

I appreciate the kind words, though I doubt my experience rises to the 
level of "master".

> One last thing:
>
> how can I arrange that function so to obtain output-attributes =
> output-attributes + id ?
>
> For example: if output-attributes is (('a' . 'aa') ('i' . 'ii'))  it 
> must
> become:    (('a' . 'aa') ('i' . 'ii') ('id' . 'foobar_1'))

Where or how are the other output-attributes being set?  It is my 
understanding that output-attributes is unset by default, so any 
\override or \tweak would not need to worry about existing definitions.

That said, consider this pattern:

%%%%
\version "2.19.83"
{ \tweak Accidental.output-attributes.id 123 bes'4 }
%%%%

Keep in mind this only *adds* a new key-value pair to the alist; it does 
not change an existing entry with the same key.


-- Aaron Hill