On 2018-06-15 09:40, Gianmaria Lari wrote:
I'm trying to write some code in scheme. At the moment I do it using
frescobaldi and I need some help for the output.
The following code
\version "2.19.81"
#(define (f w) w)
$(f "Hello")
generates a pdf file containing "Hello".
If my function f is called passing something that is not a string like
in
the following code
\version "2.19.81"
#(define (f w) w)
$(f '(a b c))
it doesn't work. How can I convert my data to a string?
Thank you, g.
P.S. I have been able to write in the Lilypond log using #(define (f
w)
(write w))...
You might want to look at the `format` function:
https://www.gnu.org/software/guile/manual/html_node/Formatted-Output.html
This gives you quite a few options for formatting data and getting a
string.
`pretty-print` can also be useful if you want to dump an arbitrary
expression to the output. You have to jump through a few hoops, though,
to get its output as a string:
%%%%
\version "2.19.81"
#(define (pretty-print-to-string arg)
(let ((o (open-output-string)) (s ""))
(pretty-print arg o)
(set! s (get-output-string o))
(close-output-port o)
s))
$(pretty-print-to-string '(a b #(c d e) f . g))
%%%%
-- Aaron Hill
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