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RE: Scheme help request: How can else of an if-statement be made to do n
From: |
John Schlomann |
Subject: |
RE: Scheme help request: How can else of an if-statement be made to do nothing? |
Date: |
Sat, 17 Oct 2020 15:09:23 -0500 |
Harm,
You used a function or macro called add-text. I can't seem to find it in any
LilyPond or Guile manual. What is that?
John
> -----Original Message-----
> From: lilypond-user [mailto:lilypond-user-
> bounces+jschlomann=wideopenwest.com@gnu.org] On Behalf Of Thomas
> Morley
> Sent: Saturday, October 17, 2020 2:24 PM
> To: David Kastrup
> Cc: Jean Abou Samra; Matthew Fong; lilypond-user
> Subject: Re: Scheme help request: How can else of an if-statement be made
> to do nothing?
>
> Am Sa., 17. Okt. 2020 um 20:33 Uhr schrieb David Kastrup <dak@gnu.org>:
> >
> > Thomas Morley <thomasmorley65@gmail.com> writes:
> >
> > > Am Sa., 17. Okt. 2020 um 19:39 Uhr schrieb Jean Abou Samra
> <jean@abou-samra.fr>:
> > >>
> > >> The point of interpret-markup is to turn a markup into a stencil, so I'd
> > >> use empty-stencil:
> > >>
> > >> \version "2.20.0"
> > >>
> > >> #(define-markup-command (print-if-defined layout props sym text)
> > >> (symbol? markup?)
> > >> (if (defined? sym)
> > >> (interpret-markup layout props
> > >> #{ \markup \with-color #'(0.8 0.2 0.2) #text #})
> > >> empty-stencil))
> > >>
> > >> symA = "Something"
> > >>
> > >> \markup {
> > >> \print-if-defined #'symA "Text"
> > >> \print-if-defined #'symB "More text"
> > >> }
> > >>
> > >
> > > An empty stencil will still be spaced (unless removed by other
> > > markup-commands).
> >
> > empty-stencil will typically not trigger additional spacing. That's
> > typically what distinguishes it from point-stencil .
> >
> > --
> > David Kastrup
>
> Well, I'd say it depends how that empty-stencil is consumed. See:
>
> \markup
> \box
> { \stencil #point-stencil \stencil #empty-stencil \stencil #point-stencil }
>
> Here I did something silly (of course there are warnings emitted) and
> the output _is_ affected.
>
> Thus, the detailed use-case is important...
>
> Cheers,
> Harm
- Scheme help request: How can else of an if-statement be made to do nothing?, Matthew Fong, 2020/10/17
- Re: Scheme help request: How can else of an if-statement be made to do nothing?, Matthew Fong, 2020/10/17
- Re: Scheme help request: How can else of an if-statement be made to do nothing?, Richard Shann, 2020/10/17
- Re: Scheme help request: How can else of an if-statement be made to do nothing?, Matthew Fong, 2020/10/17
- Re: Scheme help request: How can else of an if-statement be made to do nothing?, Jean Abou Samra, 2020/10/17
- Re: Scheme help request: How can else of an if-statement be made to do nothing?, Thomas Morley, 2020/10/17
- Re: Scheme help request: How can else of an if-statement be made to do nothing?, Matthew Fong, 2020/10/17
- Re: Scheme help request: How can else of an if-statement be made to do nothing?, David Kastrup, 2020/10/17
- Re: Scheme help request: How can else of an if-statement be made to do nothing?, Thomas Morley, 2020/10/17
- RE: Scheme help request: How can else of an if-statement be made to do nothing?,
John Schlomann <=
- Re: Scheme help request: How can else of an if-statement be made to do nothing?, Thomas Morley, 2020/10/17
- Re: Scheme help request: How can else of an if-statement be made to do nothing?, Matthew Fong, 2020/10/17
- RE: Scheme help request: How can else of an if-statement be made to do nothing?, John Schlomann, 2020/10/17