/usr/share/lilypond/2.16.2/scm/layout-beam.scm is in lilypond-data 2.16.2-3.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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;;;;
;;;; Copyright (C) 2000--2012 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/>.
(define check-beam-quant
(lambda (posl posr)
(lambda (beam posns)
"Check whether BEAM has POSL and POSR quants. POSL are (POSITION
. QUANT) pairs, where QUANT is -1 (hang), 0 (center), 1 (sit) or -2/ 2 (inter)
"
(let* ((thick (ly:grob-property beam 'beam-thickness))
(layout (ly:grob-layout beam))
(lthick (ly:output-def-lookup layout 'line-thickness))
(staff-thick lthick) ; fixme.
(quant->coord (lambda (p q)
(if (= 2 (abs q))
(+ p (/ q 4.0))
(+ p (- (* 0.5 q thick) (* 0.5 q lthick))))))
(want-l (quant->coord (car posl) (cdr posl)))
(want-r (quant->coord (car posr) (cdr posr)))
(almost-equal (lambda (x y) (< (abs (- x y)) 1e-3))))
(if (or (not (almost-equal want-l (car posns)))
(not (almost-equal want-r (cdr posns))))
(begin
(ly:warning (_ "Error in beam quanting. Expected (~S,~S) found ~S.")
want-l want-r posns)
(set! (ly:grob-property beam 'annotation)
(format #f "(~S,~S)" want-l want-r))))
posns))))
(define check-beam-slope-sign
(lambda (comparison)
(lambda (beam posns)
"Check whether the slope of BEAM is correct wrt. COMPARISON."
(let* ((slope-sign (- (cdr posns) (car posns)))
(correct (comparison slope-sign 0)))
(if (not correct)
(begin
(ly:warning (_ "Error in beam quanting. Expected ~S 0, found ~S.")
(procedure-name comparison) slope-sign)
(set! (ly:grob-property beam 'annotation)
(format #f "~S 0" (procedure-name comparison))))
(set! (ly:grob-property beam 'annotation) ""))
posns))))
(define-public (check-quant-callbacks l r)
(lambda (grob)
((check-beam-quant l r)
grob
(beam::place-broken-parts-individually grob))))
(define-public (check-slope-callbacks comparison)
(lambda (grob)
((check-beam-slope-sign comparison)
grob
(beam::place-broken-parts-individually grob))))
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