1 ;;;; This file is part of LilyPond, the GNU music typesetter.
3 ;;;; Copyright (C) 1998--2012 Jan Nieuwenhuizen <janneke@gnu.org>
4 ;;;; Han-Wen Nienhuys <hanwen@xs4all.nl>
6 ;;;; LilyPond is free software: you can redistribute it and/or modify
7 ;;;; it under the terms of the GNU General Public License as published by
8 ;;;; the Free Software Foundation, either version 3 of the License, or
9 ;;;; (at your option) any later version.
11 ;;;; LilyPond is distributed in the hope that it will be useful,
12 ;;;; but WITHOUT ANY WARRANTY; without even the implied warranty of
13 ;;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 ;;;; GNU General Public License for more details.
16 ;;;; You should have received a copy of the GNU General Public License
17 ;;;; along with LilyPond. If not, see <http://www.gnu.org/licenses/>.
19 ; for take, drop, take-while, list-index, and find-tail:
20 (use-modules (srfi srfi-1))
22 ; for define-safe-public when byte-compiling using Guile V2
23 (use-modules (scm safe-utility-defs))
25 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
30 (define-safe-public START -1)
31 (define-safe-public STOP 1)
32 (define-public LEFT -1)
33 (define-public RIGHT 1)
35 (define-public DOWN -1)
36 (define-public CENTER 0)
38 (define-safe-public DOUBLE-FLAT-QTS -4)
39 (define-safe-public THREE-Q-FLAT-QTS -3)
40 (define-safe-public FLAT-QTS -2)
41 (define-safe-public SEMI-FLAT-QTS -1)
42 (define-safe-public NATURAL-QTS 0)
43 (define-safe-public SEMI-SHARP-QTS 1)
44 (define-safe-public SHARP-QTS 2)
45 (define-safe-public THREE-Q-SHARP-QTS 3)
46 (define-safe-public DOUBLE-SHARP-QTS 4)
47 (define-safe-public SEMI-TONE-QTS 2)
49 (define-safe-public DOUBLE-FLAT -1)
50 (define-safe-public THREE-Q-FLAT -3/4)
51 (define-safe-public FLAT -1/2)
52 (define-safe-public SEMI-FLAT -1/4)
53 (define-safe-public NATURAL 0)
54 (define-safe-public SEMI-SHARP 1/4)
55 (define-safe-public SHARP 1/2)
56 (define-safe-public THREE-Q-SHARP 3/4)
57 (define-safe-public DOUBLE-SHARP 1)
58 (define-safe-public SEMI-TONE 1/2)
60 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
63 (define-public ZERO-MOMENT (ly:make-moment 0 1))
65 (define-public (moment-min a b)
66 (if (ly:moment<? a b) a b))
68 (define-public (moment<=? a b)
72 (define-public (fraction->moment fraction)
75 (ly:make-moment (car fraction) (cdr fraction))))
77 (define-public (moment->fraction moment)
78 (cons (ly:moment-main-numerator moment)
79 (ly:moment-main-denominator moment)))
81 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
83 (define-public (average x . lst)
84 (/ (+ x (apply + lst)) (1+ (length lst))))
86 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
87 ;; parser <-> output hooks.
89 (define-public (collect-bookpart-for-book parser book-part)
90 "Toplevel book-part handler."
91 (define (add-bookpart book-part)
93 parser 'toplevel-bookparts
94 (cons book-part (ly:parser-lookup parser 'toplevel-bookparts))))
95 ;; If toplevel scores have been found before this \bookpart,
96 ;; add them first to a dedicated bookpart
97 (if (pair? (ly:parser-lookup parser 'toplevel-scores))
99 (add-bookpart (ly:make-book-part
100 (ly:parser-lookup parser 'toplevel-scores)))
101 (ly:parser-define! parser 'toplevel-scores (list))))
102 (add-bookpart book-part))
104 (define-public (collect-scores-for-book parser score)
106 parser 'toplevel-scores
107 (cons score (ly:parser-lookup parser 'toplevel-scores))))
109 (define-public (collect-music-aux score-handler parser music)
110 (define (music-property symbol)
111 (let ((value (ly:music-property music symbol)))
112 (if (not (null? value))
115 (cond ((music-property 'page-marker)
116 ;; a page marker: set page break/turn permissions or label
118 (let ((label (music-property 'page-label)))
120 (score-handler (ly:make-page-label-marker label))))
121 (for-each (lambda (symbol)
122 (let ((permission (music-property symbol)))
123 (if (symbol? permission)
125 (ly:make-page-permission-marker symbol
126 (if (eqv? 'forbid permission)
129 (list 'line-break-permission 'page-break-permission
130 'page-turn-permission))))
131 ((not (music-property 'void))
132 ;; a regular music expression: make a score with this music
133 ;; void music is discarded
134 (score-handler (scorify-music music parser)))))
136 (define-public (collect-music-for-book parser music)
137 "Top-level music handler."
138 (collect-music-aux (lambda (score)
139 (collect-scores-for-book parser score))
143 (define-public (collect-book-music-for-book parser book music)
144 "Book music handler."
145 (collect-music-aux (lambda (score)
146 (ly:book-add-score! book score))
150 (define-public (scorify-music music parser)
151 "Preprocess @var{music}."
153 (for-each (lambda (func)
154 (set! music (func music parser)))
155 toplevel-music-functions)
157 (ly:make-score music))
160 (define (get-current-filename parser book)
161 "return any suffix value for output filename allowing for settings by
162 calls to bookOutputName function"
163 (let ((book-filename (paper-variable parser book 'output-filename)))
164 (if (not book-filename)
165 (ly:parser-output-name parser)
168 (define (get-current-suffix parser book)
169 "return any suffix value for output filename allowing for settings by calls to
171 (let ((book-output-suffix (paper-variable parser book 'output-suffix)))
172 (if (not (string? book-output-suffix))
173 (ly:parser-lookup parser 'output-suffix)
174 book-output-suffix)))
176 (define-public current-outfile-name #f) ; for use by regression tests
178 (define (get-outfile-name parser book)
179 "return current filename for generating backend output files"
180 ;; user can now override the base file name, so we have to use
181 ;; the file-name concatenated with any potential output-suffix value
182 ;; as the key to out internal a-list
183 (let* ((base-name (get-current-filename parser book))
184 (output-suffix (get-current-suffix parser book))
185 (alist-key (format #f "~a~a" base-name output-suffix))
186 (counter-alist (ly:parser-lookup parser 'counter-alist))
187 (output-count (assoc-get alist-key counter-alist 0))
189 ;; Allow all ASCII alphanumerics, including accents
190 (if (string? output-suffix)
194 (string-regexp-substitute
199 ;; assoc-get call will always have returned a number
200 (if (> output-count 0)
201 (set! result (format #f "~a-~a" result output-count)))
204 parser 'counter-alist
205 (assoc-set! counter-alist alist-key (1+ output-count)))
206 (set! current-outfile-name result)
209 (define (print-book-with parser book process-procedure)
210 (let* ((paper (ly:parser-lookup parser '$defaultpaper))
211 (layout (ly:parser-lookup parser '$defaultlayout))
212 (outfile-name (get-outfile-name parser book)))
213 (process-procedure book paper layout outfile-name)))
215 (define-public (print-book-with-defaults parser book)
216 (print-book-with parser book ly:book-process))
218 (define-public (print-book-with-defaults-as-systems parser book)
219 (print-book-with parser book ly:book-process-to-systems))
221 ;; Add a score to the current bookpart, book or toplevel
222 (define-public (add-score parser score)
224 ((ly:parser-lookup parser '$current-bookpart)
225 ((ly:parser-lookup parser 'bookpart-score-handler)
226 (ly:parser-lookup parser '$current-bookpart) score))
227 ((ly:parser-lookup parser '$current-book)
228 ((ly:parser-lookup parser 'book-score-handler)
229 (ly:parser-lookup parser '$current-book) score))
231 ((ly:parser-lookup parser 'toplevel-score-handler) parser score))))
233 (define-public paper-variable
236 (lambda (parser book)
237 (append (if (and book (ly:output-def? (ly:book-paper book)))
238 (list (ly:book-paper book))
240 (ly:parser-lookup parser '$papers)
241 (list (ly:parser-lookup parser '$defaultpaper))))))
242 (make-procedure-with-setter
243 (lambda (parser book symbol)
244 (any (lambda (p) (ly:output-def-lookup p symbol #f))
245 (get-papers parser book)))
246 (lambda (parser book symbol value)
247 (ly:output-def-set-variable!
248 (car (get-papers parser book))
251 (define-public (add-text parser text)
252 (add-score parser (list text)))
254 (define-public (add-music parser music)
255 (collect-music-aux (lambda (score)
256 (add-score parser score))
260 (define-public (context-mod-from-music parser music)
261 (let ((warn #t) (mods (ly:make-context-mod)))
262 (let loop ((m music) (context #f))
263 (if (music-is-of-type? m 'layout-instruction-event)
264 (let ((symbol (cons context (ly:music-property m 'symbol))))
267 (case (ly:music-property m 'name)
271 (ly:music-property m 'value)))
273 (list 'unset symbol))
277 (ly:music-property m 'grob-value)
278 (ly:music-property m 'grob-property-path)))
282 (ly:music-property m 'grob-property-path))))))
283 (case (ly:music-property m 'name)
285 (ly:add-context-mod mods
287 (ly:music-property m 'procedure))))
288 ((ContextSpeccedMusic)
289 (loop (ly:music-property m 'element)
290 (ly:music-property m 'context-type)))
292 (let ((callback (ly:music-property m 'elements-callback)))
293 (if (procedure? callback)
294 (fold loop context (callback m))
295 (if (and warn (ly:duration? (ly:music-property m 'duration)))
299 (_ "Music unsuitable for context-mod"))
300 (set! warn #f))))))))
304 (define-public (context-defs-from-music parser output-def music)
306 (let loop ((m music) (mods #f))
307 ;; The parser turns all sets, overrides etc into something
308 ;; wrapped in ContextSpeccedMusic. If we ever get a set,
309 ;; override etc that is not wrapped in ContextSpeccedMusic, the
310 ;; user has created it in Scheme himself without providing the
311 ;; required wrapping. In that case, using #f in the place of a
312 ;; context modification results in a reasonably recognizable
314 (if (music-is-of-type? m 'layout-instruction-event)
317 (case (ly:music-property m 'name)
320 (ly:music-property m 'symbol)
321 (ly:music-property m 'value)))
324 (ly:music-property m 'symbol)))
327 (ly:music-property m 'symbol)
328 (ly:music-property m 'grob-value)
329 (ly:music-property m 'grob-property-path)))
332 (ly:music-property m 'symbol)
333 (ly:music-property m 'grob-property-path)))))
334 (case (ly:music-property m 'name)
336 (ly:add-context-mod mods
338 (ly:music-property m 'procedure))))
339 ((ContextSpeccedMusic)
340 ;; Use let* here to let defs catch up with modifications
341 ;; to the context defs made in the recursion
342 (let* ((mods (loop (ly:music-property m 'element)
343 (ly:make-context-mod)))
344 (defs (ly:output-find-context-def
345 output-def (ly:music-property m 'context-type))))
349 (ly:format (_ "Cannot find context-def \\~a")
350 (ly:music-property m 'context-type)))
353 (ly:output-def-set-variable!
354 output-def (car entry)
355 (ly:context-def-modify (cdr entry) mods)))
358 (let ((callback (ly:music-property m 'elements-callback)))
359 (if (procedure? callback)
360 (fold loop mods (callback m))
361 (if (and warn (ly:duration? (ly:music-property m 'duration)))
365 (_ "Music unsuitable for output-def"))
366 (set! warn #f))))))))
373 (define-public assoc-get ly:assoc-get)
375 (define-public chain-assoc-get ly:chain-assoc-get)
377 (define-public (uniqued-alist alist acc)
378 (if (null? alist) acc
379 (if (assoc (caar alist) acc)
380 (uniqued-alist (cdr alist) acc)
381 (uniqued-alist (cdr alist) (cons (car alist) acc)))))
383 (define-public (alist<? x y)
384 (string<? (symbol->string (car x))
385 (symbol->string (car y))))
387 (define (map-alist-vals func list)
388 "map FUNC over the vals of LIST, leaving the keys."
391 (cons (cons (caar list) (func (cdar list)))
392 (map-alist-vals func (cdr list)))))
394 (define (map-alist-keys func list)
395 "map FUNC over the keys of an alist LIST, leaving the vals."
398 (cons (cons (func (caar list)) (cdar list))
399 (map-alist-keys func (cdr list)))))
401 (define-public (first-member members lst)
402 "Return first successful member (of member) from @var{members} in
406 (let ((m (member (car members) lst)))
407 (if m m (first-member (cdr members) lst)))))
409 (define-public (first-assoc keys lst)
410 "Return first successful assoc of key from @var{keys} in @var{lst}."
413 (let ((k (assoc (car keys) lst)))
414 (if k k (first-assoc (cdr keys) lst)))))
416 (define-public (flatten-alist alist)
421 (flatten-alist (cdr alist))))))
423 (define (assoc-remove key alist)
424 "Remove key (and its corresponding value) from an alist.
425 Different than assoc-remove! because it is non-destructive."
426 (define (assoc-crawler key l r)
429 (if (equal? (caar r) key)
431 (assoc-crawler key (append l `(,(car r))) (cdr r)))))
432 (assoc-crawler key '() alist))
434 (define-public (map-selected-alist-keys function keys alist)
435 "Return @var{alist} with @var{function} applied to all of the values
440 @code{guile> (map-selected-alist-keys - '(a b) '((a . 1) (b . -2) (c . 3) (d . 4)))}
441 @code{((a . -1) (b . 2) (c . 3) (d . 4)}
443 (define (map-selected-alist-keys-helper function key alist)
446 (if (equal? key (car pair))
447 (cons key (function (cdr pair)))
452 (map-selected-alist-keys
455 (map-selected-alist-keys-helper function (car keys) alist))))
460 (define-public (vector-for-each proc vec)
463 ((>= i (vector-length vec)) vec)
464 (vector-set! vec i (proc (vector-ref vec i)))))
469 (define-public (hash-table->alist t)
470 (hash-fold (lambda (k v acc) (acons k v acc))
473 ;; todo: code dup with C++.
474 (define-safe-public (alist->hash-table lst)
475 "Convert alist to table"
476 (let ((m (make-hash-table (length lst))))
477 (map (lambda (k-v) (hashq-set! m (car k-v) (cdr k-v))) lst)
483 (define (functional-or . rest)
486 (apply functional-or (cdr rest)))
489 (define (functional-and . rest)
492 (apply functional-and (cdr rest)))
495 (define (split-list lst n)
496 "Split LST in N equal sized parts"
498 (define (helper todo acc-vector k)
505 (vector-set! acc-vector k (cons (car todo) (vector-ref acc-vector k)))
506 (helper (cdr todo) acc-vector (1- k)))))
508 (helper lst (make-vector n '()) (1- n)))
510 (define (list-element-index lst x)
511 (define (helper todo k)
514 ((equal? (car todo) x) k)
516 (helper (cdr todo) (1+ k)))))
520 (define-public (count-list lst)
521 "Given @var{lst} as @code{(E1 E2 .. )}, return
522 @code{((E1 . 1) (E2 . 2) ... )}."
524 (define (helper l acc count)
526 (helper (cdr l) (cons (cons (car l) count) acc) (1+ count))
530 (reverse (helper lst '() 1)))
532 (define-public (list-join lst intermediate)
533 "Put @var{intermediate} between all elts of @var{lst}."
538 (cons elem (cons intermediate prev))
542 (define-public (filtered-map proc lst)
547 (define-public (flatten-list x)
549 (cond ((null? x) '())
550 ((not (pair? x)) (list x))
551 (else (append (flatten-list (car x))
552 (flatten-list (cdr x))))))
554 (define (list-minus a b)
555 "Return list of elements in A that are not in B."
556 (lset-difference eq? a b))
558 (define-public (uniq-list lst)
559 "Uniq @var{lst}, assuming that it is sorted. Uses @code{equal?}
563 (fold (lambda (x acc)
566 (if (equal? x (car acc))
571 (define (split-at-predicate pred lst)
572 "Split LST into two lists at the first element that returns #f for
573 (PRED previous_element element). Return the two parts as a pair.
574 Example: (split-at-predicate < '(1 2 3 2 1)) ==> ((1 2 3) . (2 1))"
577 (let ((i (list-index (lambda (x y) (not (pred x y)))
581 (cons (take lst (1+ i)) (drop lst (1+ i)))
584 (define-public (split-list-by-separator lst pred)
585 "Split @var{lst} at each element that satisfies @var{pred}, and return
586 the parts (with the separators removed) as a list of lists. For example,
587 executing @samp{(split-list-by-separator '(a 0 b c 1 d) number?)} returns
588 @samp{((a) (b c) (d))}."
589 (let loop ((result '()) (lst lst))
590 (if (and lst (not (null? lst)))
593 (list (take-while (lambda (x) (not (pred x))) lst)))
594 (let ((tail (find-tail pred lst)))
595 (if tail (cdr tail) #f)))
598 (define-public (offset-add a b)
599 (cons (+ (car a) (car b))
600 (+ (cdr a) (cdr b))))
602 (define-public (offset-flip-y o)
603 (cons (car o) (- (cdr o))))
605 (define-public (offset-scale o scale)
606 (cons (* (car o) scale)
609 (define-public (ly:list->offsets accum coords)
612 (cons (cons (car coords) (cadr coords))
613 (ly:list->offsets accum (cddr coords)))))
615 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
618 (define-public empty-interval '(+inf.0 . -inf.0))
620 (define-public (symmetric-interval expr)
621 (cons (- expr) expr))
623 (define-public (interval-length x)
624 "Length of the number-pair @var{x}, if an interval."
625 (max 0 (- (cdr x) (car x))))
627 (define-public (ordered-cons a b)
631 (define-public (interval-bound interval dir)
632 ((if (= dir RIGHT) cdr car) interval))
634 (define-public (interval-index interval dir)
635 "Interpolate @var{interval} between between left (@var{dir}=-1) and
636 right (@var{dir}=+1)."
638 (* (+ (interval-start interval) (interval-end interval)
639 (* dir (- (interval-end interval) (interval-start interval))))
642 (define-public (interval-center x)
643 "Center the number-pair @var{x}, if an interval."
644 (if (interval-empty? x)
646 (/ (+ (car x) (cdr x)) 2)))
648 (define-public interval-start car)
650 (define-public interval-end cdr)
652 (define (other-axis a)
653 (remainder (+ a 1) 2))
655 (define-public (interval-widen iv amount)
656 (cons (- (car iv) amount)
657 (+ (cdr iv) amount)))
659 (define-public (interval-empty? iv)
660 (> (car iv) (cdr iv)))
662 (define-public (interval-union i1 i2)
664 (min (car i1) (car i2))
665 (max (cdr i1) (cdr i2))))
667 (define-public (interval-intersection i1 i2)
669 (max (car i1) (car i2))
670 (min (cdr i1) (cdr i2))))
672 (define-public (interval-sane? i)
673 (not (or (nan? (car i))
677 (> (car i) (cdr i)))))
679 (define-public (add-point interval p)
680 (cons (min (interval-start interval) p)
681 (max (interval-end interval) p)))
683 (define-public (reverse-interval iv)
684 (cons (cdr iv) (car iv)))
686 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
692 (define (coord-operation operator operand coordinate)
694 (cons (operator (coord-x operand) (coord-x coordinate))
695 (operator (coord-y operand) (coord-y coordinate)))
696 (cons (operator operand (coord-x coordinate))
697 (operator operand (coord-y coordinate)))))
699 (define (coord-apply function coordinate)
702 ((coord-x function) (coord-x coordinate))
703 ((coord-y function) (coord-y coordinate)))
705 (function (coord-x coordinate))
706 (function (coord-y coordinate)))))
708 (define-public (coord-translate coordinate amount)
709 (coord-operation + amount coordinate))
711 (define-public (coord-scale coordinate amount)
712 (coord-operation * amount coordinate))
714 (define-public (coord-rotate coordinate degrees-in-radians)
718 (exact->inexact (coord-x coordinate))
719 (exact->inexact (coord-y coordinate))))
722 (+ (* (coord-x coordinate) (coord-x coordinate))
723 (* (coord-y coordinate) (coord-y coordinate)))))
724 (angle (angle-0-2pi (atan (coord-y coordinate) (coord-x coordinate)))))
726 (* radius (cos (+ angle degrees-in-radians)))
727 (* radius (sin (+ angle degrees-in-radians))))))
729 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
732 (define-public PI (* 4 (atan 1)))
734 (define-public TWO-PI (* 2 PI))
736 (define-public PI-OVER-TWO (/ PI 2))
738 (define-public THREE-PI-OVER-TWO (* 3 PI-OVER-TWO))
740 (define-public (cyclic-base-value value cycle)
741 "Take @var{value} and modulo-maps it between 0 and base @var{cycle}."
743 (cyclic-base-value (+ value cycle) cycle)
745 (cyclic-base-value (- value cycle) cycle)
748 (define-public (angle-0-2pi angle)
749 "Take @var{angle} (in radians) and maps it between 0 and 2pi."
750 (cyclic-base-value angle TWO-PI))
752 (define-public (angle-0-360 angle)
753 "Take @var{angle} (in degrees) and maps it between 0 and 360 degrees."
754 (cyclic-base-value angle 360.0))
756 (define-public PI-OVER-180 (/ PI 180))
758 (define-public (degrees->radians angle-degrees)
759 "Convert the given angle from degrees to radians."
760 (* angle-degrees PI-OVER-180))
762 (define-public (ellipse-radius x-radius y-radius angle)
764 (* x-radius y-radius)
766 (+ (* (expt y-radius 2)
767 (* (cos angle) (cos angle)))
769 (* (sin angle) (sin angle)))))))
771 (define-public (polar->rectangular radius angle-in-degrees)
772 "Return polar coordinates (@var{radius}, @var{angle-in-degrees})
773 as rectangular coordinates @ode{(x-length . y-length)}."
775 (let ((complex (make-polar
777 (degrees->radians angle-in-degrees))))
780 (imag-part complex))))
782 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
785 (define-public (string-endswith s suffix)
786 (equal? suffix (substring s
787 (max 0 (- (string-length s) (string-length suffix)))
790 (define-public (string-startswith s prefix)
791 (equal? prefix (substring s 0 (min (string-length s) (string-length prefix)))))
793 (define-public (string-encode-integer i)
796 ((< i 0) (string-append "n" (string-encode-integer (- i))))
798 (make-string 1 (integer->char (+ 65 (modulo i 26))))
799 (string-encode-integer (quotient i 26))))))
801 (define (number->octal-string x)
802 (let* ((n (inexact->exact x))
803 (n64 (quotient n 64))
804 (n8 (quotient (- n (* n64 64)) 8)))
808 (number->string (remainder (- n (+ (* n64 64) (* n8 8))) 8)))))
810 (define-public (ly:inexact->string x radix)
811 (let ((n (inexact->exact x)))
812 (number->string n radix)))
814 (define-public (ly:number-pair->string c)
815 (string-append (ly:number->string (car c)) " "
816 (ly:number->string (cdr c))))
818 (define-public (dir-basename file . rest)
819 "Strip suffixes in @var{rest}, but leave directory component for
821 (define (inverse-basename x y) (basename y x))
822 (simple-format #f "~a/~a" (dirname file)
823 (fold inverse-basename file rest)))
825 (define-public (write-me message x)
826 "Return @var{x}. Display @var{message} and write @var{x}.
827 Handy for debugging, possibly turned off."
828 (display message) (write x) (newline) x)
831 (define-public (stderr string . rest)
832 (apply format (cons (current-error-port) (cons string rest)))
833 (force-output (current-error-port)))
835 (define-public (debugf string . rest)
837 (apply stderr (cons string rest))))
839 (define (index-cell cell dir)
844 (define (cons-map f x)
845 "map F to contents of X"
846 (cons (f (car x)) (f (cdr x))))
848 (define-public (list-insert-separator lst between)
849 "Create new list, inserting @var{between} between elements of @var{lst}."
853 (cons x (cons between y))))
854 (fold-right conc #f lst))
856 (define-public (string-regexp-substitute a b str)
857 (regexp-substitute/global #f a str 'pre b 'post))
859 (define (regexp-split str regex)
861 (define end-of-prev-match 0)
862 (define (notice match)
864 (set! matches (cons (substring (match:string match)
868 (set! end-of-prev-match (match:end match)))
870 (regexp-substitute/global #f regex str notice 'post)
872 (if (< end-of-prev-match (string-length str))
875 (cons (substring str end-of-prev-match (string-length str)) matches)))
887 (define-public (binary-search start end getter target-val)
888 (_i "Find the index between @var{start} and @var{end} (an integer)
889 which produces the closest match to @var{target-val} if
890 applied to function @var{getter}.")
893 (let* ((compare (quotient (+ start end) 2))
894 (get-val (getter compare)))
896 ((< target-val get-val)
897 (set! end (1- compare)))
898 ((< get-val target-val)
899 (set! start (1+ compare))))
900 (binary-search start end getter target-val))))
902 (define-public (car< a b)
905 (define-public (car<= a b)
906 (<= (car a) (car b)))
908 (define-public (symbol<? lst r)
909 (string<? (symbol->string lst) (symbol->string r)))
911 (define-public (symbol-key<? lst r)
912 (string<? (symbol->string (car lst)) (symbol->string (car r))))
914 (define-public (eval-carefully symbol module . default)
915 "Check whether all symbols in expr @var{symbol} are reachable
916 in module @var{module}. In that case evaluate, otherwise
917 print a warning and set an optional @var{default}."
918 (let* ((unavailable? (lambda (sym)
919 (not (module-defined? module sym))))
920 (sym-unavailable (if (pair? symbol)
923 (filter symbol? (flatten-list symbol)))
924 (if (unavailable? symbol)
927 (if (null? sym-unavailable)
929 (let* ((def (and (pair? default) (car default))))
930 (ly:programming-error
931 "cannot evaluate ~S in module ~S, setting to ~S"
932 (object->string symbol)
933 (object->string module)
934 (object->string def))
938 ;; don't confuse users with #<procedure .. > syntax.
940 (define-public (scm->string val)
941 (if (and (procedure? val)
942 (symbol? (procedure-name val)))
943 (symbol->string (procedure-name val))
945 (if (self-evaluating? val)
950 (call-with-output-string (lambda (port) (display val port)))
955 (define-public (!= lst r)
958 (define-public lily-unit->bigpoint-factor
960 ((equal? (ly:unit) "mm") (/ 72.0 25.4))
961 ((equal? (ly:unit) "pt") (/ 72.0 72.27))
962 (else (ly:error (_ "unknown unit: ~S") (ly:unit)))))
964 (define-public lily-unit->mm-factor
965 (* 25.4 (/ lily-unit->bigpoint-factor 72)))
967 ;;; FONT may be font smob, or pango font string...
968 (define-public (font-name-style font)
970 (string-downcase font)
971 (let* ((font-name (ly:font-name font))
972 (full-name (if font-name font-name (ly:font-file-name font))))
973 (string-downcase full-name))))
975 (define-public (modified-font-metric-font-scaling font)
976 (let* ((designsize (ly:font-design-size font))
977 (magnification (* (ly:font-magnification font)))
978 (scaling (* magnification designsize)))
979 (debugf "scaling:~S\n" scaling)
980 (debugf "magnification:~S\n" magnification)
981 (debugf "design:~S\n" designsize)
984 (define-public (version-not-seen-message input-file-name)
986 (ly:format "~a:0" input-file-name)
987 (_ "no \\version statement found, please add~afor future compatibility")
988 (format #f "\n\n\\version ~s\n\n" (lilypond-version))))
990 (define-public (old-relative-not-used-message input-file-name)
992 (ly:format "~a:0" input-file-name)
993 (_ "old relative compatibility not used")))