/usr/share/lilypond/2.14.2/scm/auto-beam.scm is in lilypond-data 2.14.2-4.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 | ;;;; This file is part of LilyPond, the GNU music typesetter.
;;;;
;;;; Copyright (C) 2000--2011 Jan Nieuwenhuizen <janneke@gnu.org>
;;;;
;;;; LilyPond is free software: you can redistribute it and/or modify
;;;; it under the terms of the GNU General Public License as published by
;;;; the Free Software Foundation, either version 3 of the License, or
;;;; (at your option) any later version.
;;;;
;;;; LilyPond is distributed in the hope that it will be useful,
;;;; but WITHOUT ANY WARRANTY; without even the implied warranty of
;;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
;;;; GNU General Public License for more details.
;;;;
;;;; You should have received a copy of the GNU General Public License
;;;; along with LilyPond. If not, see <http://www.gnu.org/licenses/>.
;; Determine whether an auto beam should be extended to the right
;; of the current stem. We start anywhere except on the last note
;; of a beat. We end according to the follwing rules, in order
;; of decreasing priority:
;;
;; 1. end <type>
;; 2. end <greater type>
;; 3. if 1-2 not specified, end at beatStructure intervals
;;
;; Rationale:
;;
;; [user override]
;; 1. override for specific duration type
;; 2. overrides apply to shorter durations
;;
;; defined in scm/time-signature-settings.scm:
;; 1. Default grouping for common time signatures
(define-public (default-auto-beam-check context dir measure-pos test-beam)
(define (get name default)
(let ((value (ly:context-property context name)))
(if (not (null? value)) value default)))
(define (beaming<? a b)
(ly:moment<? (fraction->moment (car a))
(fraction->moment (car b))))
(define (ending-moments group-list start-beat base-moment)
(if (null? group-list)
'()
(let ((new-start (+ start-beat (car group-list))))
(cons (ly:moment-mul (ly:make-moment new-start 1) base-moment)
(ending-moments (cdr group-list) new-start base-moment)))))
(define (larger-setting test-beam sorted-alist)
(if (null? sorted-alist)
'()
(let* ((first-key (caar sorted-alist))
(first-moment (fraction->moment first-key)))
(if (moment<=? test-beam first-moment)
(car sorted-alist)
(larger-setting test-beam (cdr sorted-alist))))))
(define (beat-end? moment beat-structure)
(pair? (member moment beat-structure))) ;; member returns a list if found, not #t
;; Start of actual auto-beam test routine
;;
;;
;; Don't start auto beams on grace notes
(if (and (!= (ly:moment-grace-numerator (ly:context-now context)) 0)
(= dir START))
#f
(let* ((base-moment (get 'baseMoment (ly:make-moment 1 4)))
(measure-length (get 'measureLength (ly:make-moment 1 1)))
(time-signature-fraction
(get 'timeSignatureFraction '(4 . 4)))
(beat-structure (get 'beatStructure '(1 1 1 1)))
(beat-endings (ending-moments beat-structure 0 base-moment))
(exceptions (sort (assoc-get 'end
(get 'beamExceptions '())
'())
beaming<?))
(function (if (= dir START) 'begin 'end))
(type (moment->fraction test-beam))
(non-grace (ly:make-moment
(ly:moment-main-numerator measure-pos)
(ly:moment-main-denominator measure-pos)))
(pos (if (ly:moment<? non-grace ZERO-MOMENT)
(ly:moment-add measure-length non-grace)
non-grace))
(type-grouping (assoc-get type exceptions '()))
(default-rule (if (null? type-grouping)
(larger-setting test-beam exceptions)
'()))
(default-grouping (if (pair? default-rule)
(cdr default-rule)
'()))
(default-beat-length (if (pair? default-rule)
(car default-rule)
'()))
(exception-grouping (if (null? type-grouping)
default-grouping
type-grouping))
(grouping-moment (if (null? type-grouping)
(fraction->moment default-beat-length)
test-beam))
(exception-moments (ending-moments
exception-grouping 0 grouping-moment)))
(if (= dir START)
;; Start rules
(or (not (equal? time-signature-fraction '(3 . 4))) ;; start anywhere if not 3/4
(= (ly:moment-main-numerator pos) 0) ;; start at beginning of measure
(not (null? exception-grouping)) ;; don't use special rules if exception
(beat-end? pos beat-endings) ;; are we at start of beat?
(and (not (equal? test-beam base-moment)) ;; is beat split?
(not (beat-end? (ly:moment-add pos test-beam)
beat-endings)))) ;; will this note end the beat
;; End rules
(or (= (ly:moment-main-numerator pos) 0) ;; end at measure beginning
(if (null? exception-grouping)
(beat-end? pos beat-endings) ;; no exception, so check beat ending
(member pos exception-moments))))))) ;; check exception rule
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