Hi Valentin,
Le 29/10/2022 à 00:42, Valentin Petzel a écrit :
Lilypond with Guile 1.8 used a less capable version of the format command that
did not feature a destination argument (the default simple-format of Guile).
With Guile 2 Lilypond uses the full, powerful ice9 format (as can be seen
using #(display format)).
ice9 format takes a destination argument as first argument. This one can be any
output port, #t for the current output port (i.e. you print the result) or #f
to return the result.
Not sure what makes you think that?
Test input:
\version "2.22.2"
#(ly:message "~s ~s ~s"
format
simple-format
(@ (ice-9 format) format))
2.22 output:
#<procedure format args> #<primitive-procedure simple-format>
#<procedure format args>
2.23.80 output:
#<procedure 7fe7e0088b80 at ice-9/format.scm:1609:9 (destination
format-string . args) | (deprecated-format-string-only)> #<procedure
simple-format (_ _ . _)> #<procedure 7fe7e0088b80 at
ice-9/format.scm:1609:9 (destination format-string . args) |
(deprecated-format-string-only)>
As you can see, the format procedure loaded by default in LilyPond
files is always the one from (ice-9 format).
As far as I can see, simple-format has always required a boolean or port
as first argument. As for (@ (ice-9 format) format), its first boolean
or port argument is optional in Guile 1, optional with a deprecation
warning in Guile 2, and required in Guile 3.
Best,
Jean
