This file is indexed.

/usr/share/lilypond/2.18.2/scm/backend-library.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
 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
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
;;;; This file is part of LilyPond, the GNU music typesetter.
;;;;
;;;; Copyright (C) 2005--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/>.

;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;; backend helpers.

(use-modules (scm ps-to-png)
             (scm paper-system)
             (ice-9 optargs))

(define-public (ly:system command)
  (ly:debug (_ "Invoking `~a'...") (string-join command))
  (let ((status (apply ly:spawn command)))
    (if (> status 0)
        (begin
          (ly:warning (_ "`~a' failed (~a)\n") command status)
          ;; hmmm.  what's the best failure option?
          (throw 'ly-file-failed)))))

(define-public (sanitize-command-option str)
  "Kill dubious shell quoting."

  (string-append
   "\""
   (regexp-substitute/global #f "[^-_ 0-9,.a-zA-Z'\"\\]" str 'pre 'post)
   "\""))

(define-public (search-executable names)
  (define (helper path lst)
    (if (null? (cdr lst))
        (car lst)
        (if (search-path path (car lst)) (car lst)
            (helper path (cdr lst)))))

  (let ((path (parse-path (getenv "PATH"))))
    (helper path names)))

(define-public (search-gs)

  ;; must be sure that we don't catch stuff from old GUBs.
  (search-executable '("gs")))

(define-public (postscript->pdf paper-width paper-height name)
  (let* ((pdf-name (string-append
                    (dir-basename name ".ps" ".eps")
                    ".pdf"))
         (is-eps (string-match "\\.eps$" name))
         (*unspecified* (if #f #f))
         (cmd
          (remove (lambda (x) (eq? x *unspecified*))
                  (list
                   (search-gs)
                   (if (ly:get-option 'verbose) *unspecified* "-q")
                   (if (or (ly:get-option 'gs-load-fonts)
                           (ly:get-option 'gs-load-lily-fonts)
                           (eq? PLATFORM 'windows))
                       "-dNOSAFER"
                       "-dSAFER")

                   (if is-eps
                       "-dEPSCrop"
                       (ly:format "-dDEVICEWIDTHPOINTS=~$" paper-width))
                   (if is-eps
                       *unspecified*
                       (ly:format "-dDEVICEHEIGHTPOINTS=~$" paper-height))
                   "-dCompatibilityLevel=1.4"
                   "-dNOPAUSE"
                   "-dBATCH"
                   "-r1200"
                   "-sDEVICE=pdfwrite"
                   (string-append "-sOutputFile="
                                  (string-join
                                   (string-split pdf-name #\%)
                                   "%%"))
                   "-c.setpdfwrite"
                   (string-append "-f" name)))))

    (ly:message (_ "Converting to `~a'...\n") pdf-name)
    (ly:system cmd)))

(define-public (postscript->png resolution paper-width paper-height name)
  (let* ((verbose (ly:get-option 'verbose))
         (rename-page-1 #f))

    ;; Do not try to guess the name of the png file,
    ;; GS produces PNG files like BASE-page%d.png.
    (ly:message (_ "Converting to ~a...") "PNG")
    (make-ps-images name
                    #:resolution resolution
                    #:page-width paper-width
                    #:page-height paper-height
                    #:rename-page-1 rename-page-1
                    #:be-verbose verbose
                    #:anti-alias-factor (ly:get-option 'anti-alias-factor)
                    #:pixmap-format (ly:get-option 'pixmap-format))
    (ly:progress "\n")))

(define-public (postprocess-output paper-book module filename formats)
  (let* ((completed (completize-formats formats))
         (base (dir-basename filename ".ps" ".eps"))
         (intermediate (remove (lambda (x) (member x formats)) completed)))
    (for-each (lambda (f)
                ((eval (string->symbol (format #f "convert-to-~a" f))
                       module) paper-book filename)) completed)
    (if (ly:get-option 'delete-intermediate-files)
        (for-each (lambda (f)
                    (if (file-exists? f) (delete-file f)))
                  (map (lambda (x) (string-append base "." x)) intermediate)))))

(define-public (completize-formats formats)
  (define new-fmts '())
  (if (member "png" formats)
      (set! formats (cons "ps" formats)))
  (if (member "pdf" formats)
      (set! formats (cons "ps" formats)))
  (for-each (lambda (x)
              (if (member x formats) (set! new-fmts (cons x new-fmts))))
            '("ps" "pdf" "png"))
  (uniq-list (reverse new-fmts)))

(define (header-to-file file-name key value)
  (set! key (symbol->string key))
  (if (not (equal? "-" file-name))
      (set! file-name (string-append file-name "." key)))
  (ly:message (_ "Writing header field `~a' to `~a'...")
              key
              (if (equal? "-" file-name) "<stdout>" file-name))
  (if (equal? file-name "-")
      (display value)
      (let ((port (open-file file-name "w")))
        (display value port)
        (close-port port)))

  (ly:progress "\n")
  "")

(define-public (output-scopes scopes fields basename)
  (define (output-scope scope)
    (string-concatenate
     (module-map
      (lambda (sym var)
        (let ((val (if (variable-bound? var) (variable-ref var) "")))
          (if (and (memq sym fields) (string? val))
              (header-to-file basename sym val))
          ""))
      scope)))
  (string-concatenate (map output-scope scopes)))

(define-public (relevant-book-systems book)
  (let ((systems (ly:paper-book-systems book)))
    ;; skip booktitles.
    (if (and (not (ly:get-option 'include-book-title-preview))
             (pair? systems)
             (ly:prob-property (car systems) 'is-book-title #f))
        (cdr systems)
        systems)))

(define-public (relevant-dump-systems systems)
  (let ((to-dump-systems '()))
    (for-each
     (lambda (sys)
       (if (or (paper-system-title? sys)
               (not (pair? to-dump-systems))
               (paper-system-title? (car to-dump-systems)))
           (set! to-dump-systems (cons sys to-dump-systems))))
     systems)
    to-dump-systems))

(define missing-stencil-list '())

(define-public (backend-testing output-module)
  (define (missing-stencil-expression name)
    (begin
      (ly:warning (_ "missing stencil expression `~S'") name)
      ""))

  (for-each (lambda (x)
              (if (not (module-defined? output-module x))
                  (begin
                    (module-define! output-module x
                                    (lambda* (#:optional y . z)
                                             (missing-stencil-expression x)))
                    (set! missing-stencil-list (cons x missing-stencil-list)))))
            (ly:all-stencil-commands)))

(define-public (remove-stencil-warnings output-module)
  (for-each
   (lambda (x)
     (module-remove! output-module x))
   missing-stencil-list))

(define (filter-out pred? lst)
  (filter (lambda (x) (not (pred? x))) lst))

(define-public (font-name-split font-name)
  "Return @code{(FONT-NAME . DESIGN-SIZE)} from @var{font-name} string
or @code{#f}."
  (let ((match (regexp-exec (make-regexp "(.*)-([0-9]*)") font-name)))
    (if (regexp-match? match)
        (cons (match:substring match 1) (match:substring match 2))
        (cons font-name-designsize #f))))

;; Example of a pango-physical-font
;; ("Emmentaler-11" "/home/janneke/vc/lilypond/out/share/lilypond/current/fonts/otf/emmentaler-11.otf" 0)
(define-public (pango-pf-font-name pango-pf)
  "Return the font-name of the pango physical font @var{pango-pf}."
  (list-ref pango-pf 0))
(define-public (pango-pf-file-name pango-pf)
  "Return the file-name of the pango physical font @var{pango-pf}."
  (list-ref pango-pf 1))
(define-public (pango-pf-fontindex pango-pf)
  "Return the fontindex of the pango physical font @var{pango-pf}."
  (list-ref pango-pf 2))

(define (pango-font-name pango-font)
  (let ((pf-fonts (ly:pango-font-physical-fonts pango-font)))
    (if (pair? pf-fonts)
        (pango-pf-font-name (car pf-fonts))
        "")))

(define-public (define-fonts paper define-font define-pango-pf)
  "Return a string of all fonts used in @var{paper}, invoking the functions
@var{define-font} and @var{define-pango-pf} for producing the actual font
definition."

  (let* ((font-list (ly:paper-fonts paper))
         (pango-fonts (filter ly:pango-font? font-list))
         (other-fonts (filter-out ly:pango-font? font-list))
         (other-font-names (map ly:font-name other-fonts))
         (pango-only-fonts
          (filter-out (lambda (x)
                        (member (pango-font-name x) other-font-names))
                      pango-fonts)))

    (define (font-load-command font)
      (let* ((font-name (ly:font-name font))
             (designsize (ly:font-design-size font))
             (magnification (* (ly:font-magnification font)))
             (ops (ly:output-def-lookup paper 'output-scale))
             (scaling (* ops magnification designsize)))
        (if (equal? font-name "unknown")
            (display (list font font-name)))
        (define-font font font-name scaling)))

    (define (pango-font-load-command pango-font)
      (let* ((pf-fonts (ly:pango-font-physical-fonts pango-font))
             (pango-pf (if (pair? pf-fonts) (car pf-fonts) '("" "" 0)))
             (font-name (pango-pf-font-name pango-pf))
             (scaling (ly:output-def-lookup paper 'output-scale)))
        (if (equal? font-name "unknown")
            (display (list pango-font font-name)))
        (define-pango-pf pango-pf font-name scaling)))

    (string-append
     (string-concatenate (map font-load-command other-fonts))
     (string-concatenate (map pango-font-load-command pango-only-fonts)))))