2015-06-16 0:10 GMT+02:00 Klaus Blum benbigno...@gmx.de:
Dear list fellows,
I am trying to write a function which outputs chord symbols after
transposing them.
But what type of data do I need for the input of the \chordmode or
\chords function, i.e stuff like
{ c1 d:m f g:7 }
?
\chords { c1 d:m f g:7 }
returns:
C Dm F G7
as expected.
mychords =
#(define-music-function (parser location arg) (ly:music?)
#{
\chords { $arg }
#})
\mychords { c1 d:m f g:7 }
The above is equivalent to
\mychords \notemode { c1 d:m f g:7 }
Can't work.
You have to state \chordmode explicitly or work _inside_ chordmode.
Either of this work:
\mychords \chordmode { c1 d:m f g:7 }
\chordmode { \mychords { c1 d:m f g:7 } }
Ofcourse 'mychords' contains some redundancy then ;)
Below the same
HTH,
Harm
returns:
C DFG
Additions like :m or :7 are ignored and produce an error message
because they are not part of a regular music expression.
transchordsI =
#(define-music-function (parser location arg) (ly:music?)
#{
\chords { \transpose c d { $arg } }
#})
\transchordsI { c1 d:m f g:7 }
and
transchordsII =
#(define-music-function (parser location arg) (ly:music?)
#{
\transpose c d { \chords { $arg } }
#})
\transchordsII { c1 d:m f g:7 }
obviously suffer the same problem.
However,
\trans { \chords { c1 d:m f g:7 } }
works without problems.
It seems that the OUTPUT of \chords is accepted as a music expression.
Surprisingly, even
\chords { \trans { c1 d:m f g:7 } }
works, and I can't understand why...
I've tried nearly each and every data type (predicate). If ly:music?
isn't the right choice, what do I need?
Am I missing something else?
Thanks for any hint
Klaus
chord_function_fail.ly
http://lilypond.1069038.n5.nabble.com/file/n177895/chord_function_fail.ly
chord_function_fail.pdf
http://lilypond.1069038.n5.nabble.com/file/n177895/chord_function_fail.pdf
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