/usr/share/lilypond/2.18.2/scm/skyline.scm is in lilypond-data 2.18.2-4.1.
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 | ;;;; This file is part of LilyPond, the GNU music typesetter.
;;;;
;;;; Copyright (C) 2013 Mike Solomon <mike@mikesolomon.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-public (skyline-pair::empty? skyp)
(and (ly:skyline-empty? (ly:skyline-pair::skyline skyp UP))
(ly:skyline-empty? (ly:skyline-pair::skyline skyp DOWN))))
;; checks if the pair is not null, and then if not empty
(define-public (skyline-pair-and-non-empty? skyp)
(and (ly:skyline-pair? skyp)
(not (skyline-pair::empty? skyp))))
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