/usr/share/lilypond/2.18.2/scm/titling.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.
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 | ;;;; This file is part of LilyPond, the GNU music typesetter.
;;;;
;;;; Copyright (C) 2004--2012 Jan Nieuwenhuizen <janneke@gnu.org>
;;;; 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-public (layout-extract-page-properties layout)
(list (append `((line-width . ,(ly:paper-get-number
layout 'line-width)))
(ly:output-def-lookup layout 'text-font-defaults))))
;;;;;;;;;;;;;;;;;;
(define-public ((marked-up-headfoot what-odd what-even)
layout scopes page-number is-last-bookpart is-bookpart-last-page)
"Read variables @var{what-odd}, @var{what-even} from @var{layout},
and interpret them as markup. The @var{props} argument will include
variables set in @var{scopes} and @code{page:is-bookpart-last-page},
@code{page:is-last-bookpart}, @code{page:page-number-string}, and
@code{page:page-number}."
(define (get sym)
(ly:output-def-lookup layout sym))
(define (interpret-in-page-env potential-markup)
(if (markup? potential-markup)
(let* ((alists (map ly:module->alist scopes))
(prefixed-alists
(map (lambda (alist)
(map (lambda (entry)
(cons
(string->symbol
(string-append
"header:"
(symbol->string (car entry))))
(cdr entry)))
alist))
alists))
(pgnum-alist
(list
(cons 'header:tagline
(ly:modules-lookup scopes 'tagline
(ly:output-def-lookup layout 'tagline)))
(cons 'page:is-last-bookpart is-last-bookpart)
(cons 'page:is-bookpart-last-page is-bookpart-last-page)
(cons 'page:page-number-string
(number->string page-number))
(cons 'page:page-number page-number)))
(props (append
(list pgnum-alist)
prefixed-alists
(layout-extract-page-properties layout))))
(interpret-markup layout props potential-markup))
empty-stencil))
(interpret-in-page-env
(if (and (even? page-number)
(markup? (get what-even)))
(get what-even)
(get what-odd))))
(define-public ((marked-up-title what) layout scopes)
"Read variables @var{what} from @var{scopes}, and interpret it as markup.
The @var{props} argument will include variables set in @var{scopes} (prefixed
with `header:'."
(define (get sym)
(let ((x (ly:modules-lookup scopes sym)))
(if (markup? x) x #f)))
(let* ((alists (map ly:module->alist scopes))
(prefixed-alist
(map (lambda (alist)
(map (lambda (entry)
(cons
(string->symbol
(string-append
"header:"
(symbol->string (car entry))))
(cdr entry)))
alist))
alists))
(props (append prefixed-alist
(layout-extract-page-properties layout)))
(markup (ly:output-def-lookup layout what)))
(if (markup? markup)
(interpret-markup layout props markup)
empty-stencil)))
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