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Re: select a note in a chord

From: Valentin Villenave
Subject: Re: select a note in a chord
Date: Fri, 18 Jan 2019 00:46:34 +0100

On 1/18/19, David Kastrup <address@hidden> wrote:
> This is not really an issue for string-manipulation.

Agreed. Nevertheless, I was pleasantly surprised to see that
ly:parser-include-string could accept an incomplete expression.
(Previously, ly:parser-parse-string would have been much less flexible

> Let's rather do this in a sane manner:

Indeed, a named "let" loop is clearly the preferred way to go!

That being said, I still wonder if there’d be any way of making it
work with either iota or make-list without having to go through string
manipulations. (It would remove the need for a loop with an
incremented counter.)

And btw, why does mapping onto (iota num) require a lambda (x)
function even though that x argument does absolutely nothing? My
instinct would be to use lambda (), but that throws an error.

>            ((negative? num) (loop (1+ num) #{ \drop 1 #music #}))
>            (else (loop (1- num) #{ \rise 1 #music #})))))

Why #music and not $music inside the #{ #}? (I suspect there’s no
difference in this case, but $music is the more familiar syntax
inherited from before your parser/lexer improvements.)


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