Hi again,
while trying to change LilyPond's behaviour concerning bar lines, I stumbled
upon some strange behaviour. What I'd like to achieve: When ending a bar with
e repetition sign ":|", I need double lines ("||") at the beginning of the
next bar.
I found bar-glyph-alist in scm/output-lib.scm and decided to change it to the
following lines (shortened for this example):
#(define bar-glyph-alist
'(
;; regular bar
("|" . ("|" . ()))
;; repetitions
("|:" . ("|" . "|:"))
(":|" . (":|" . ()))
(":|:" . (":|" . "|:"))
;; double lines
("||" . ("||" . ()))
;; double lines combined with repetitions
("||:" . ("||" . "|:"))
(":||" . (":|" . "||"))
))
When setting music now, everything works as expected.
As I consider changing LilyPond's default files as hacking, I decided to move
the list into my .ly file (see attached file) and revert scm/output-lib.scm
to its original state. Unfortunately, this does not work: LilyPond leaves the
end of the line (where a repetition sign ":|" should be found) empty, as well
as the beginning of the next line.
Does anyone have any clues what's going wrong?
Thanks,
Matthias
\version "2.12.2"
% override default bar types to allow arbitrarily placed bar lines
#(define my-bar-glyph-alist
'(
;; regular bar
("|" . ("|" . ()))
;; repetitions
("|:" . ("|" . "|:"))
(":|" . (":|" . ()))
(":|:" . (":|" . "|:"))
;; double lines
("||" . ("||" . ()))
;; double lines combined with repetitions
("||:" . ("||" . "|:"))
(":||" . (":|" . "||"))
))
#(define (my-bar-line::calc-glyph-name grob)
(let* (
(index-cell (lambda (cell dir)
(if (equal? dir 1)
(cdr cell)
(car cell))))
(glyph (ly:grob-property grob 'glyph))
(dir (ly:item-break-dir grob))
(result (assoc glyph my-bar-glyph-alist))
(glyph-name (if (= dir CENTER)
glyph
(if (and result (string? (index-cell (cdr result) dir)))
(index-cell (cdr result) dir)
#f)))
)
glyph-name
))
\new Score
{
\new Staff
{
\override Staff.BarLine #'glyph-name = #my-bar-line::calc-glyph-name
\bar "|:" g'1 \bar ":||" \break
g'1 \bar "||" \break
}
}
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