Hi Carl and David
Am 20.09.2010 um 11:29 schrieb Carl Sorensen:
On 9/20/10 1:19 AM, "David Kastrup" <d...@gnu.org> wrote:
Patrick Schmidt <p.l.schm...@gmx.de> writes:
Hi all,
I have several files with definitions of guitar fret diagrams for
various chord shapes (e.g. c-shape.ly, a-shape.ly, g-shape.ly, e-
shape.ly and d-shape.ly). I can't include all of these files at the
same time in the main file as quite a few chord alternatives
start on
the same pitch. How can I use those definitions only temporarily? I
tried this:
cShape = { \include "c-shape.ly" }
aShape = { \include "a-shape.ly" }
music = \chordmode {
\cShape
c1
\aShape
c1
}
Maybe something like
stdfretboard = #(copy-list fretboard-table)
\include "c-shape.ly"
cshapefretboard = #(copy-list fretboard-table)
#(set! fretboard-table stdfretboard)
\include "a-shape.ly"
ashapefretboard = #(copy-list fretboard-table)
cShape = #(define-music-function ... (set! fretboard-table
cshapefretboard)
aShape = #(define-music-funciton ...
or similar. If c-shape/a-shape just add items to the front of
fretboard-table, you will not even need to copy stuff. If it is
something other than a list, you'll need some other copying
mechanism.
This is a good thought as a temporary workaround. However, it
won't work
as-is, because fretboard-table is a hash table. We'd need to define a
hash-table copy function:
(define (hash-table-copy my-table)
(let ((new-hash-table (make-hash-table 100)))
(hash-for-each (lambda (key value)
(hash-set! new-hash-table key value))
my-table)
new-hash-table))
then replace copy-list above with hash-table-copy.
cShape and aShape would then be defined as void music functions,
which is
not shown in David's code above.
Thanks for the idea, David.
Note: the code above is *not* tested. I hope to get it tested in
the next
day or two.
This is still only a temporary workaround, I think, because we
should avoid
the hard-coded fretboard-table.
Carl
Thanks for your hints! I will play around with it. I understand the
general idea of the code but at the moment I'm still struggling to
differentiate between scheme functions and self-defined functions.
For example I couldn't find "copy-list" anywhere in the manuals so I
guess it is a self-defined function or a scheme function I haven't
found, yet. (In Carl's code I can see the definition of »hash-table-
copy«.) I'm also unsure about what should follow after "define-music-
function" instead of the three dots. But I will continue to study the
"Extending"-manual.
Thanks,
patrick
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