Hi,
I'm once more struggling with the commands to include files within
Scheme functions.
In the attached .ily files one defines a music expression while the
other uses it in a Staff definition.
I can happily make that work using regular \includes or by calling
ly:parser-include-string twice. But I need to wrap this into a Scheme
function to include multiple files from within a function and process
the results (the music expressions from the files) within the same function.
I am not surprised that the second approach (using
ly:parser-include-string twice within the function) doesn't work. Last
time this question popped up I learned that any definition from inside
the included file will only be visible after the function has returned.
(uncomment second example to see it "in action").
So I thought I had to use ly:parser-parse-string together with
ly:parser-clone to make the definitions available earlier, and in
another context this worked
(https://github.com/openlilylib/oll-core/blob/master/oll-core.ily#L59).
However, this time I get strange errors with the parse-string function
as that doesn't even seem to be able to parse the first file properly.
The first error is
levelOne.ily:3:19 <0>: error: wrong type for argument 2. Expecting
music, found "c"
music = \relative
c' { c }
followed by numerous consecutive errors that are probably neglectable.
I would very much appreciate any further clarification and assistance as
I really don't have a clue how to proceed.
Urs
PS: The actual context is
https://git.openlilylib.org/bfsc/kayser/blob/score/includes/lib/file-handling.ily#L124
(the unfinished stuff starting from L. 143), but I'm not sure if that's
sufficiently retraceable from that page)
\version "2.19.43"
% Including them one after another works fine
%%{
#(ly:parser-include-string "\\include \"levelOne.ily\"")
#(ly:parser-include-string "\\include \"levelTwo.ily\"")
%}
% Wrapping the includes in a Scheme function doesn't work
% because \music will only be visible when the expression
% has been fully evaluated (i.e. after leaving the function).
%{
includeBoth =
#(define-void-function ()()
(ly:parser-include-string "\\include \"levelOne.ily\"")
(ly:parser-include-string "\\include \"levelTwo.ily\""))
\includeBoth
%}
% Using ly:parser-parse-string with a parser clone doesn't
% work either because it seems not to be able to parse
% the (first) file in the first place.
%{
includeBoth =
#(define-void-function ()()
(ly:parser-parse-string (ly:parser-clone)
"\\include \"levelOne.ily\"")
(ly:parser-parse-string (ly:parser-clone)
"\\include \"levelTwo.ily\""))
\includeBoth
%}
\version "2.19.43"
music = \relative c' { c }\version "2.19.43"
\new Staff \music
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