+ ((end * * 4 16) . ,(ly:make-moment 1 8))
+
+ ;; in 6 8, 9 8 and 12 8 time:
+ ;; use beatGrouping for all except 1 32nd notes
+ ;; end beams with 32nd notes every 1 8 note
+
+ ((end 1 32 6 8) . ,(ly:make-moment 1 8))
+ ((end 1 32 6 8) . ,(ly:make-moment 2 8))
+ ((end 1 32 6 8) . ,(ly:make-moment 3 8))
+ ((end 1 32 6 8) . ,(ly:make-moment 4 8))
+ ((end 1 32 6 8) . ,(ly:make-moment 5 8))
+
+ ((end 1 32 9 8) . ,(ly:make-moment 1 8))
+ ((end 1 32 9 8) . ,(ly:make-moment 2 8))
+ ((end 1 32 9 8) . ,(ly:make-moment 3 8))
+ ((end 1 32 9 8) . ,(ly:make-moment 4 8))
+ ((end 1 32 9 8) . ,(ly:make-moment 5 8))
+ ((end 1 32 9 8) . ,(ly:make-moment 6 8))
+ ((end 1 32 9 8) . ,(ly:make-moment 7 8))
+ ((end 1 32 9 8) . ,(ly:make-moment 8 8))
+
+ ((end 1 32 12 8) . ,(ly:make-moment 1 8))
+ ((end 1 32 12 8) . ,(ly:make-moment 2 8))
+ ((end 1 32 12 8) . ,(ly:make-moment 3 8))
+ ((end 1 32 12 8) . ,(ly:make-moment 4 8))
+ ((end 1 32 12 8) . ,(ly:make-moment 5 8))
+ ((end 1 32 12 8) . ,(ly:make-moment 6 8))
+ ((end 1 32 12 8) . ,(ly:make-moment 7 8))
+ ((end 1 32 12 8) . ,(ly:make-moment 8 8))
+ ((end 1 32 12 8) . ,(ly:make-moment 9 8))
+ ((end 1 32 12 8) . ,(ly:make-moment 10 8))
+ ((end 1 32 12 8) . ,(ly:make-moment 11 8))
+ ))
+
+(define (override-property-setting context property setting value)
+ "Like the C++ code that executes \\override, but without type
+checking. "
+ (ly:context-set-property!
+ context property
+ (cons (cons setting value) (ly:context-property context property))))
+
+(define (revert-property-setting context property setting)
+ "Like the C++ code that executes \revert, but without type
+checking. "
+
+ (define (revert-member alist entry new)
+ "Return ALIST, with ENTRY removed. ALIST is not modified, instead
+a fresh copy of the list-head is made."
+ (cond
+ ((null? alist) new)
+ ((equal? (car alist) entry) (revert-member (cdr alist) entry new))
+ (else (revert-member (cdr alist) entry (cons (car alist) new)))))
+
+ (ly:context-set-property!
+ context property
+ (revert-member (ly:context-property context property) setting '())))
+
+(define-public (override-auto-beam-setting setting num den . rest)
+ (ly:export
+ (context-spec-music
+ (make-apply-context (lambda (c)
+ (override-property-setting
+ c 'autoBeamSettings
+ setting (ly:make-moment num den))))
+ (if (and (pair? rest) (symbol? (car rest)))
+ (car rest)
+ 'Voice))))
+
+(define-public (score-override-auto-beam-setting setting num den)
+ (override-auto-beam-setting setting num den 'Score))
+
+(define-public (revert-auto-beam-setting setting num den . rest)
+ (ly:export
+ (context-spec-music
+ (make-apply-context (lambda (c)
+ (revert-property-setting
+ c 'autoBeamSettings
+ (cons setting (ly:make-moment num den)))))
+ (if (and (pair? rest) (symbol? (car rest)))
+ (car rest)
+ 'Voice))))
+
+;; Determine end moment for auto beaming (or begin moment, but mostly
+;; 0== anywhere). In order of decreasing priority:
+;;
+;; 1. end <type> * *
+;; 2. end * * *
+;; 3. end <type> <num> <den>
+;; 4. end * <num> <den>
+;; 5. if 1-4 not specified, begin anywhere, end at time determined by
+;; beatGrouping and beatLength:
+;; if beatGrouping and beatLength are consistent with measureLength,
+;; use beatGrouping to determine end of beams.
+;; if beatGrouping and beatLength are inconsistent with measureLength,
+;; use beatLength to determine end of beams.
+;;
+;; Rationale:
+;;
+;; [user override]
+;; 1. override for specific duration type
+;; 2. generic override
+;;
+;; [to be defined in config file]
+;; 3. exceptions for specific time signature, for specific duration type
+;; 4. exceptions for specific time signature
+;; 5. easy catch-all rule for non-specified measure types
+
+
+(define-public (default-auto-beam-check context dir test)
+ (define (get name default)
+ (let ((value (ly:context-property context name)))
+ (if (not (null? value)) value default)))
+
+ (define (ending-moments group-list start-beat beat-length)
+ (if (null? group-list)
+ '()
+ (let ((new-start (+ start-beat (car group-list))))
+ (cons (ly:moment-mul (ly:make-moment new-start 1) beat-length)
+ (ending-moments (cdr group-list) new-start beat-length)))))