-----Original Message-----
From: David Kastrup <d...@gnu.org>
To: msk...@ansuz.sooke.bc.ca
CC: lilypond-user <lilypond-user@gnu.org>
Subject: Re: Not Nice Review of the LilyPond
Date: Sun, 02 Dec 2018 17:00:33 +0100
msk...@ansuz.sooke.bc.ca writes:
> On Sun, 2 Dec 2018, David Kastrup wrote:
> > is hard. At least LilyPond is a better starting point than
> > MusiXTeX.
>
> But MusiXTeX can do "if" statements.
I have a hard time imagining how this is going to hold in a more
convincing manner than you could do it with LilyPond.
***********
I felt that an "if" would be useful, so I eventually came up with:
#(define (iffable? x)
(or (string-or-music? x) (markup? x) (ly:score? x) (ly:book? x)))
iff = #(define-scheme-function
( flag var )
( boolean? iffable? )
(if
flag
(if
(string? var)
(ly:parser-include-string var)
var)))
I am sure that better programmers could do something far more elegant,
but this works for me.
Using this, I can control compilation using variables, with lines such
as:
\iff \Three "\include \"No3_score.ily\""
Instead of a string as in the example, markups, music etc. can also be
included as a result of a successful "iff" test.
I also made a \choice routine, which effectively gives an "else" result
if the test fails, but I have never actually felt any need to use it.
David
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