Hello everyone,
No less than 10 minutes after, I discovered I skipped the section on cond.
That solves everything!
Many thanks,
mattfong
On Sat, Oct 17, 2020 at 9:27 AM Matthew Fong <oxen...@gmail.com> wrote:
> Hello everyone,
>
> I've been digging into guile/scheme and LilyPond, and it doesn't appear
> that else-statements can be empty. Any pointers would be appreciated in
> advance.
>
> For the example below, I would prefer the else-statement here to do
> nothing, rather than print an empty markup: \markup { "" }, as doing so
> creates a small, but observable change in vertical spacing.
>
> % Print markup if a symbol is defined
> #(define-markup-command (PrintIfDefined layout props sym text) (symbol?
> markup?)
> (if (defined? sym)
> ;; Do this if true
> (interpret-markup layout props
> #{ \markup \with-color #'(0.8 0.2 0.2) #text #})
> ;; How do I do nothing here? (empty statement preferred)
> (interpret-markup layout props
> #{ \markup "" #})
> )
> )
>
> printInfo = 1
> \markup \PrintIfDefined #'printInfo "Print this if symbol printInfo is
> defined"
>
>
> Many thanks,
> mattfong
>
>
