/usr/share/lilypond/2.18.2/scm/paper-system.scm is in lilypond-data 2.18.2-4.
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) 2006--2012 Han-Wen Nienhuys <hanwen@xs4all.nl>
;;;;
;;;; 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-module (scm paper-system))
(use-modules (lily)
(srfi srfi-1)
(ice-9 optargs))
(define-public (paper-system-title? system)
(equal? #t (ly:prob-property system 'is-title)
))
(define (system-stencil system-grob main-stencil)
(let* ((padding (ly:grob-property system-grob 'in-note-padding #f))
(in-notes (if padding (ly:grob-property system-grob 'in-note-stencil) empty-stencil))
(in-notes (if in-notes in-notes empty-stencil))
(direction (if padding (ly:grob-property system-grob 'in-note-direction) UP)))
(if padding
(ly:stencil-combine-at-edge main-stencil Y direction in-notes padding)
main-stencil)))
(define-public (paper-system-stencil system)
(let ((main-stencil (ly:prob-property system 'stencil))
(system-grob (ly:prob-property system 'system-grob)))
(if (ly:grob? system-grob)
(system-stencil system-grob main-stencil)
main-stencil)))
(define-public (paper-system-layout system)
(let*
((g (paper-system-system-grob system)))
(if (ly:grob? g)
(ly:grob-layout g)
#f)))
(define-public (paper-system-system-grob paper-system)
(ly:prob-property paper-system 'system-grob))
(define-public (paper-system-extent system axis)
(ly:stencil-extent (paper-system-stencil system) axis))
(define-public (paper-system-staff-extents ps)
(ly:prob-property ps 'staff-refpoint-extent '(0 . 0)))
(define-public (paper-system-annotate-last system layout)
(let*
((bottomspace (ly:prob-property system 'bottom-space))
(y-extent (paper-system-extent system Y))
(x-extent (paper-system-extent system X))
(stencil (ly:prob-property system 'stencil))
(arrow (if (number? bottomspace)
(annotate-y-interval layout
"bottom-space"
(cons (- (car y-extent) bottomspace)
(car y-extent))
#t)
#f)))
(if arrow
(set! stencil
(ly:stencil-add stencil arrow)))
(set! (ly:prob-property system 'stencil)
stencil)
))
;; Y-ext and next-Y-ext are either skyline-pairs or extents
(define*-public (annotate-padding system-Y system-X Y-ext X-ext
next-system-Y next-system-X next-Y-ext next-X-ext
layout horizon-padding padding #:key (base-color blue))
(let* ((eps 0.001)
(skyline (and (ly:skyline-pair? Y-ext)
(ly:skyline-pair::skyline Y-ext DOWN)))
(next-skyline (and (ly:skyline-pair? next-Y-ext)
(ly:skyline-pair::skyline next-Y-ext UP)))
(annotation-X (cond
((and skyline next-skyline)
(-
(ly:skyline::get-touching-point skyline next-skyline horizon-padding)
horizon-padding))
(skyline
(ly:skyline::get-max-height-position skyline))
(next-skyline
(ly:skyline::get-max-height-position next-skyline))
(else
(max (cdr X-ext)
(cdr next-X-ext)))))
(annotation-Y (if skyline
(ly:skyline::get-height skyline annotation-X)
(car Y-ext)))
(next-annotation-Y (if next-skyline
(- (+ (ly:skyline::get-height next-skyline
(- (+ annotation-X system-X)
next-system-X))
next-system-Y)
system-Y)
(cdr next-Y-ext)))
(padding-blocks (>= next-annotation-Y (- annotation-Y padding eps)))
(contrast-color (append (cdr base-color) (list (car base-color))))
(color (if padding-blocks contrast-color base-color))
(annotation (ly:stencil-translate-axis
(annotate-y-interval
layout
"padding"
`(,(- annotation-Y padding). ,annotation-Y)
#t
#:color color)
annotation-X X)))
(if (> padding 0.0)
annotation
empty-stencil)))
(define-public (paper-system-annotate system next-system layout)
"Add arrows and texts to indicate which lengths are set."
(let* ((grob (ly:prob-property system 'system-grob))
(paper-height (ly:output-def-lookup layout 'paper-height))
(bottom-margin (ly:output-def-lookup layout 'bottom-margin))
(top-margin (ly:output-def-lookup layout 'top-margin))
(spaceable-staves (if (ly:grob? grob) (ly:system::get-spaceable-staves grob) '()))
(all-staves (if (ly:grob? grob) (ly:system::get-staves grob) '()))
(spaceable-staff-annotate
(lambda (before-staff after-staff)
(let ((before-Y (ly:grob-relative-coordinate before-staff grob Y))
(after-Y (ly:grob-relative-coordinate after-staff grob Y)))
(annotate-spacing-spec
layout
(ly:get-spacing-spec before-staff after-staff)
before-Y
after-Y))))
(staff-padding-annotate
(lambda (before-staff after-staff)
(let ((before-Y (ly:grob-relative-coordinate before-staff grob Y))
(before-X (ly:grob-relative-coordinate before-staff grob X))
(before-X-ext (ly:grob-extent before-staff before-staff X))
(after-Y (ly:grob-relative-coordinate after-staff grob Y))
(after-X (ly:grob-relative-coordinate after-staff grob X))
(after-X-ext (ly:grob-extent after-staff after-staff X))
(skylines (ly:grob-property before-staff 'vertical-skylines))
(after-skylines (ly:grob-property after-staff 'vertical-skylines))
(padding (assoc-get 'padding
(ly:get-spacing-spec before-staff after-staff)
0.0))
(horizon-padding (ly:grob-property before-staff
'skyline-horizontal-padding
0.0)))
(ly:stencil-translate
(annotate-padding
before-Y before-X skylines before-X-ext
after-Y after-X after-skylines after-X-ext
layout horizon-padding padding)
(cons before-X before-Y)))))
(staff-annotations (if (< 1 (length spaceable-staves))
(map spaceable-staff-annotate
(drop-right spaceable-staves 1)
(drop spaceable-staves 1))
'()))
(staff-padding-annotations (if (< 1 (length all-staves))
(map staff-padding-annotate
(drop-right all-staves 1)
(drop all-staves 1))
'()))
(estimate-extent (if (ly:grob? grob)
(annotate-y-interval layout
"extent-estimate"
(ly:grob-property grob 'pure-Y-extent)
#f)
#f))
(spacing-spec (cond ((and next-system
(paper-system-title? system)
(paper-system-title? next-system))
(ly:output-def-lookup layout 'markup-markup-spacing))
((paper-system-title? system)
(ly:output-def-lookup layout 'markup-system-spacing))
((and next-system
(paper-system-title? next-system))
(ly:output-def-lookup layout 'score-markup-spacing))
((not next-system)
(ly:output-def-lookup layout 'last-bottom-spacing))
((ly:prob-property system 'last-in-score #f)
(ly:output-def-lookup layout 'score-system-spacing))
(else
(ly:output-def-lookup layout 'system-system-spacing))))
(last-staff-Y (car (paper-system-staff-extents system)))
(system-Y (ly:prob-property system 'Y-offset 0.0))
(system-X (ly:prob-property system 'X-offset 0.0))
(next-system-Y (and next-system
(ly:prob-property next-system 'Y-offset 0.0)))
(next-system-X (and next-system
(ly:prob-property next-system 'X-offset 0.0)))
(first-staff-next-system-Y (if next-system
(- (+ (cdr (paper-system-staff-extents next-system))
system-Y)
next-system-Y)
(+ system-Y top-margin bottom-margin (- paper-height))))
(skyline (or
(ly:prob-property system 'vertical-skylines #f)
(paper-system-extent system Y)))
(next-skyline (and next-system
(or
(ly:prob-property next-system 'vertical-skylines #f)
(paper-system-extent next-system Y))))
(horizon-padding (and
(ly:grob? grob)
(ly:grob-property grob 'skyline-horizontal-padding 0)))
(padding-annotation (if (skyline-pair-and-non-empty? next-system)
(annotate-padding
(- system-Y) system-X skyline (paper-system-extent system X)
(- next-system-Y) next-system-X next-skyline (paper-system-extent next-system X)
layout
horizon-padding
(assoc-get 'padding spacing-spec 0.0)
#:base-color blue)
empty-stencil))
(system-annotation (annotate-spacing-spec
layout spacing-spec
last-staff-Y
first-staff-next-system-Y))
(annotations (ly:stencil-add
padding-annotation
(stack-stencils Y DOWN 0.0 staff-padding-annotations)
(stack-stencils Y DOWN 0.0 (append staff-annotations (list system-annotation))))))
(if estimate-extent
(set! annotations
(stack-stencils X RIGHT 5.5
(list annotations
estimate-extent))))
(if (not (null? annotations))
(set! (ly:prob-property system 'stencil)
(ly:stencil-add
(ly:prob-property system 'stencil)
(ly:make-stencil
(ly:stencil-expr annotations)
(ly:stencil-extent empty-stencil X)
(ly:stencil-extent empty-stencil Y)))))
(ly:prob-property system 'stencil)))
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