+(define-public ((every-nth-bar-number-visible n) barnum) (= 0 (modulo barnum n)))
+
+(define-public ((modulo-bar-number-visible n m) barnum) (and (> barnum 1) (= m (modulo barnum n))))
+
+(define-public ((set-bar-number-visibility n) tr)
+ (let* ((bn (ly:context-property tr 'currentBarNumber)))
+ (ly:context-set-property! tr 'barNumberVisibility (modulo-bar-number-visible n (modulo bn n)))))
+
+(define-public (default-bar-number-visibility barnum) (> barnum 1))
+
+;; See documentation of Item::visibility_lambda_
+(define-public (begin-of-line-visible d) (if (= d 1) '(#f . #f) '(#t . #t)))
+(define-public (end-of-line-visible d) (if (= d -1) '(#f . #f) '(#t . #t)))
+(define-public (spanbar-begin-of-line-invisible d) (if (= d -1) '(#t . #t) '(#f . #f)))
+
+(define-public (all-visible d) '(#f . #f))
+(define-public (all-invisible d) '(#t . #t))
+(define-public (begin-of-line-invisible d) (if (= d 1) '(#t . #t) '(#f . #f)))
+(define-public (end-of-line-invisible d) (if (= d -1) '(#t . #t) '(#f . #f)))
+
+
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+;; Bar lines.
+
+;
+; How should a bar line behave at a break?
+;
+;; Why prepend `default-' to every scm identifier?
+(define-public (default-break-barline glyph dir)
+ (let ((result (assoc glyph
+ '((":|:" . (":|" . "|:"))
+ ("||:" . ("||" . "|:"))
+ ("|" . ("|" . ()))
+ ("||:" . ("||" . "|:"))
+ ("|s" . (() . "|"))
+ ("|:" . ("|" . "|:"))
+ ("|." . ("|." . ()))
+
+ ;; hmm... should we end with a bar line here?
+ (".|" . ("|" . ".|"))
+ (":|" . (":|" . ()))
+ ("||" . ("||" . ()))
+ (".|." . (".|." . ()))
+ ("" . ("" . ""))
+ (":" . (":" . ""))
+ ("empty" . (() . ()))
+ ("brace" . (() . "brace"))
+ ("bracket" . (() . "bracket"))
+ )
+ )))
+
+ (if (equal? result #f)
+ (ly:warn "Unknown bar glyph: `~S'" glyph)
+ (index-cell (cdr result) dir))
+ ) )
+
+
+
+(define-public (shift-right-at-line-begin g)
+ "Shift an item to the right, but only at the start of the line."
+ (if (and (ly:item? g) (equal? (ly:item-break-dir g) RIGHT))
+ (ly:grob-translate-axis! g 3.5 X)
+ ))