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)
305 (let ((bottom 'Voice) (warn #t))
306 (define (get-bottom sym)
308 (let ((def (ly:output-def-lookup output-def sym #f)))
310 (let ((def-child (ly:context-def-lookup def 'default-child #f)))
312 (get-bottom def-child)))))
314 (let loop ((m music) (mods #f))
315 ;; The parser turns all sets, overrides etc into something
316 ;; wrapped in ContextSpeccedMusic. If we ever get a set,
317 ;; override etc that is not wrapped in ContextSpeccedMusic, the
318 ;; user has created it in Scheme himself without providing the
319 ;; required wrapping. In that case, using #f in the place of a
320 ;; context modification results in a reasonably recognizable
322 (if (music-is-of-type? m 'layout-instruction-event)
325 (case (ly:music-property m 'name)
328 (ly:music-property m 'symbol)
329 (ly:music-property m 'value)))
332 (ly:music-property m 'symbol)))
335 (ly:music-property m 'symbol)
336 (ly:music-property m 'grob-value)
337 (ly:music-property m 'grob-property-path)))
340 (ly:music-property m 'symbol)
341 (ly:music-property m 'grob-property-path)))))
342 (case (ly:music-property m 'name)
344 (ly:add-context-mod mods
346 (ly:music-property m 'procedure))))
347 ((ContextSpeccedMusic)
348 (let ((sym (ly:music-property m 'context-type)))
349 (if (eq? sym 'Bottom)
351 (set! bottom (get-bottom sym)))
352 (let ((def (ly:output-def-lookup output-def sym)))
353 (if (ly:context-def? def)
354 (ly:output-def-set-variable!
356 (ly:context-def-modify
358 (loop (ly:music-property m 'element)
359 (ly:make-context-mod))))
362 (ly:format (_ "Cannot find context-def \\~a") sym))))))
364 (let ((callback (ly:music-property m 'elements-callback)))
365 (if (procedure? callback)
366 (fold loop mods (callback m))
367 (if (and warn (ly:duration? (ly:music-property m 'duration)))
371 (_ "Music unsuitable for output-def"))
372 (set! warn #f))))))))
379 (define-public assoc-get ly:assoc-get)
381 (define-public chain-assoc-get ly:chain-assoc-get)
383 (define-public (uniqued-alist alist acc)
384 (if (null? alist) acc
385 (if (assoc (caar alist) acc)
386 (uniqued-alist (cdr alist) acc)
387 (uniqued-alist (cdr alist) (cons (car alist) acc)))))
389 (define-public (alist<? x y)
390 (string<? (symbol->string (car x))
391 (symbol->string (car y))))
393 (define (map-alist-vals func list)
394 "map FUNC over the vals of LIST, leaving the keys."
397 (cons (cons (caar list) (func (cdar list)))
398 (map-alist-vals func (cdr list)))))
400 (define (map-alist-keys func list)
401 "map FUNC over the keys of an alist LIST, leaving the vals."
404 (cons (cons (func (caar list)) (cdar list))
405 (map-alist-keys func (cdr list)))))
407 (define-public (first-member members lst)
408 "Return first successful member (of member) from @var{members} in
412 (let ((m (member (car members) lst)))
413 (if m m (first-member (cdr members) lst)))))
415 (define-public (first-assoc keys lst)
416 "Return first successful assoc of key from @var{keys} in @var{lst}."
419 (let ((k (assoc (car keys) lst)))
420 (if k k (first-assoc (cdr keys) lst)))))
422 (define-public (flatten-alist alist)
427 (flatten-alist (cdr alist))))))
429 (define (assoc-remove key alist)
430 "Remove key (and its corresponding value) from an alist.
431 Different than assoc-remove! because it is non-destructive."
432 (define (assoc-crawler key l r)
435 (if (equal? (caar r) key)
437 (assoc-crawler key (append l `(,(car r))) (cdr r)))))
438 (assoc-crawler key '() alist))
440 (define-public (map-selected-alist-keys function keys alist)
441 "Return @var{alist} with @var{function} applied to all of the values
446 @code{guile> (map-selected-alist-keys - '(a b) '((a . 1) (b . -2) (c . 3) (d . 4)))}
447 @code{((a . -1) (b . 2) (c . 3) (d . 4)}
449 (define (map-selected-alist-keys-helper function key alist)
452 (if (equal? key (car pair))
453 (cons key (function (cdr pair)))
458 (map-selected-alist-keys
461 (map-selected-alist-keys-helper function (car keys) alist))))
466 (define-public (vector-for-each proc vec)
469 ((>= i (vector-length vec)) vec)
470 (vector-set! vec i (proc (vector-ref vec i)))))
475 (define-public (hash-table->alist t)
476 (hash-fold (lambda (k v acc) (acons k v acc))
479 ;; todo: code dup with C++.
480 (define-safe-public (alist->hash-table lst)
481 "Convert alist to table"
482 (let ((m (make-hash-table (length lst))))
483 (map (lambda (k-v) (hashq-set! m (car k-v) (cdr k-v))) lst)
489 (define (functional-or . rest)
492 (apply functional-or (cdr rest)))
495 (define (functional-and . rest)
498 (apply functional-and (cdr rest)))
501 (define (split-list lst n)
502 "Split LST in N equal sized parts"
504 (define (helper todo acc-vector k)
511 (vector-set! acc-vector k (cons (car todo) (vector-ref acc-vector k)))
512 (helper (cdr todo) acc-vector (1- k)))))
514 (helper lst (make-vector n '()) (1- n)))
516 (define (list-element-index lst x)
517 (define (helper todo k)
520 ((equal? (car todo) x) k)
522 (helper (cdr todo) (1+ k)))))
526 (define-public (count-list lst)
527 "Given @var{lst} as @code{(E1 E2 .. )}, return
528 @code{((E1 . 1) (E2 . 2) ... )}."
530 (define (helper l acc count)
532 (helper (cdr l) (cons (cons (car l) count) acc) (1+ count))
536 (reverse (helper lst '() 1)))
538 (define-public (list-join lst intermediate)
539 "Put @var{intermediate} between all elts of @var{lst}."
544 (cons elem (cons intermediate prev))
548 (define-public (filtered-map proc lst)
553 (define-public (flatten-list x)
555 (cond ((null? x) '())
556 ((not (pair? x)) (list x))
557 (else (append (flatten-list (car x))
558 (flatten-list (cdr x))))))
560 (define (list-minus a b)
561 "Return list of elements in A that are not in B."
562 (lset-difference eq? a b))
564 (define-public (uniq-list lst)
565 "Uniq @var{lst}, assuming that it is sorted. Uses @code{equal?}
569 (fold (lambda (x acc)
572 (if (equal? x (car acc))
577 (define (split-at-predicate pred lst)
578 "Split LST into two lists at the first element that returns #f for
579 (PRED previous_element element). Return the two parts as a pair.
580 Example: (split-at-predicate < '(1 2 3 2 1)) ==> ((1 2 3) . (2 1))"
583 (let ((i (list-index (lambda (x y) (not (pred x y)))
587 (cons (take lst (1+ i)) (drop lst (1+ i)))
590 (define-public (split-list-by-separator lst pred)
591 "Split @var{lst} at each element that satisfies @var{pred}, and return
592 the parts (with the separators removed) as a list of lists. For example,
593 executing @samp{(split-list-by-separator '(a 0 b c 1 d) number?)} returns
594 @samp{((a) (b c) (d))}."
595 (let loop ((result '()) (lst lst))
596 (if (and lst (not (null? lst)))
599 (list (take-while (lambda (x) (not (pred x))) lst)))
600 (let ((tail (find-tail pred lst)))
601 (if tail (cdr tail) #f)))
604 (define-public (offset-add a b)
605 (cons (+ (car a) (car b))
606 (+ (cdr a) (cdr b))))
608 (define-public (offset-flip-y o)
609 (cons (car o) (- (cdr o))))
611 (define-public (offset-scale o scale)
612 (cons (* (car o) scale)
615 (define-public (ly:list->offsets accum coords)
618 (cons (cons (car coords) (cadr coords))
619 (ly:list->offsets accum (cddr coords)))))
621 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
624 (define-public empty-interval '(+inf.0 . -inf.0))
626 (define-public (symmetric-interval expr)
627 (cons (- expr) expr))
629 (define-public (interval-length x)
630 "Length of the number-pair @var{x}, if an interval."
631 (max 0 (- (cdr x) (car x))))
633 (define-public (ordered-cons a b)
637 (define-public (interval-bound interval dir)
638 ((if (= dir RIGHT) cdr car) interval))
640 (define-public (interval-index interval dir)
641 "Interpolate @var{interval} between between left (@var{dir}=-1) and
642 right (@var{dir}=+1)."
644 (* (+ (interval-start interval) (interval-end interval)
645 (* dir (- (interval-end interval) (interval-start interval))))
648 (define-public (interval-center x)
649 "Center the number-pair @var{x}, if an interval."
650 (if (interval-empty? x)
652 (/ (+ (car x) (cdr x)) 2)))
654 (define-public interval-start car)
656 (define-public interval-end cdr)
658 (define (other-axis a)
659 (remainder (+ a 1) 2))
661 (define-public (interval-widen iv amount)
662 (cons (- (car iv) amount)
663 (+ (cdr iv) amount)))
665 (define-public (interval-empty? iv)
666 (> (car iv) (cdr iv)))
668 (define-public (interval-union i1 i2)
670 (min (car i1) (car i2))
671 (max (cdr i1) (cdr i2))))
673 (define-public (interval-intersection i1 i2)
675 (max (car i1) (car i2))
676 (min (cdr i1) (cdr i2))))
678 (define-public (interval-sane? i)
679 (not (or (nan? (car i))
683 (> (car i) (cdr i)))))
685 (define-public (add-point interval p)
686 (cons (min (interval-start interval) p)
687 (max (interval-end interval) p)))
689 (define-public (reverse-interval iv)
690 (cons (cdr iv) (car iv)))
692 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
698 (define (coord-operation operator operand coordinate)
700 (cons (operator (coord-x operand) (coord-x coordinate))
701 (operator (coord-y operand) (coord-y coordinate)))
702 (cons (operator operand (coord-x coordinate))
703 (operator operand (coord-y coordinate)))))
705 (define (coord-apply function coordinate)
708 ((coord-x function) (coord-x coordinate))
709 ((coord-y function) (coord-y coordinate)))
711 (function (coord-x coordinate))
712 (function (coord-y coordinate)))))
714 (define-public (coord-translate coordinate amount)
715 (coord-operation + amount coordinate))
717 (define-public (coord-scale coordinate amount)
718 (coord-operation * amount coordinate))
720 (define-public (coord-rotate coordinate degrees-in-radians)
724 (exact->inexact (coord-x coordinate))
725 (exact->inexact (coord-y coordinate))))
728 (+ (* (coord-x coordinate) (coord-x coordinate))
729 (* (coord-y coordinate) (coord-y coordinate)))))
730 (angle (angle-0-2pi (atan (coord-y coordinate) (coord-x coordinate)))))
732 (* radius (cos (+ angle degrees-in-radians)))
733 (* radius (sin (+ angle degrees-in-radians))))))
735 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
738 (define-public PI (* 4 (atan 1)))
740 (define-public TWO-PI (* 2 PI))
742 (define-public PI-OVER-TWO (/ PI 2))
744 (define-public THREE-PI-OVER-TWO (* 3 PI-OVER-TWO))
746 (define-public (cyclic-base-value value cycle)
747 "Take @var{value} and modulo-maps it between 0 and base @var{cycle}."
749 (cyclic-base-value (+ value cycle) cycle)
751 (cyclic-base-value (- value cycle) cycle)
754 (define-public (angle-0-2pi angle)
755 "Take @var{angle} (in radians) and maps it between 0 and 2pi."
756 (cyclic-base-value angle TWO-PI))
758 (define-public (angle-0-360 angle)
759 "Take @var{angle} (in degrees) and maps it between 0 and 360 degrees."
760 (cyclic-base-value angle 360.0))
762 (define-public PI-OVER-180 (/ PI 180))
764 (define-public (degrees->radians angle-degrees)
765 "Convert the given angle from degrees to radians."
766 (* angle-degrees PI-OVER-180))
768 (define-public (ellipse-radius x-radius y-radius angle)
770 (* x-radius y-radius)
772 (+ (* (expt y-radius 2)
773 (* (cos angle) (cos angle)))
775 (* (sin angle) (sin angle)))))))
777 (define-public (polar->rectangular radius angle-in-degrees)
778 "Return polar coordinates (@var{radius}, @var{angle-in-degrees})
779 as rectangular coordinates @ode{(x-length . y-length)}."
781 (let ((complex (make-polar
783 (degrees->radians angle-in-degrees))))
786 (imag-part complex))))
788 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
791 (define-public (string-endswith s suffix)
792 (equal? suffix (substring s
793 (max 0 (- (string-length s) (string-length suffix)))
796 (define-public (string-startswith s prefix)
797 (equal? prefix (substring s 0 (min (string-length s) (string-length prefix)))))
799 (define-public (string-encode-integer i)
802 ((< i 0) (string-append "n" (string-encode-integer (- i))))
804 (make-string 1 (integer->char (+ 65 (modulo i 26))))
805 (string-encode-integer (quotient i 26))))))
807 (define (number->octal-string x)
808 (let* ((n (inexact->exact x))
809 (n64 (quotient n 64))
810 (n8 (quotient (- n (* n64 64)) 8)))
814 (number->string (remainder (- n (+ (* n64 64) (* n8 8))) 8)))))
816 (define-public (ly:inexact->string x radix)
817 (let ((n (inexact->exact x)))
818 (number->string n radix)))
820 (define-public (ly:number-pair->string c)
821 (string-append (ly:number->string (car c)) " "
822 (ly:number->string (cdr c))))
824 (define-public (dir-basename file . rest)
825 "Strip suffixes in @var{rest}, but leave directory component for
827 (define (inverse-basename x y) (basename y x))
828 (simple-format #f "~a/~a" (dirname file)
829 (fold inverse-basename file rest)))
831 (define-public (write-me message x)
832 "Return @var{x}. Display @var{message} and write @var{x}.
833 Handy for debugging, possibly turned off."
834 (display message) (write x) (newline) x)
837 (define-public (stderr string . rest)
838 (apply format (cons (current-error-port) (cons string rest)))
839 (force-output (current-error-port)))
841 (define-public (debugf string . rest)
843 (apply stderr (cons string rest))))
845 (define (index-cell cell dir)
850 (define (cons-map f x)
851 "map F to contents of X"
852 (cons (f (car x)) (f (cdr x))))
854 (define-public (list-insert-separator lst between)
855 "Create new list, inserting @var{between} between elements of @var{lst}."
859 (cons x (cons between y))))
860 (fold-right conc #f lst))
862 (define-public (string-regexp-substitute a b str)
863 (regexp-substitute/global #f a str 'pre b 'post))
865 (define (regexp-split str regex)
867 (define end-of-prev-match 0)
868 (define (notice match)
870 (set! matches (cons (substring (match:string match)
874 (set! end-of-prev-match (match:end match)))
876 (regexp-substitute/global #f regex str notice 'post)
878 (if (< end-of-prev-match (string-length str))
881 (cons (substring str end-of-prev-match (string-length str)) matches)))
893 (define-public (binary-search start end getter target-val)
894 (_i "Find the index between @var{start} and @var{end} (an integer)
895 which produces the closest match to @var{target-val} if
896 applied to function @var{getter}.")
899 (let* ((compare (quotient (+ start end) 2))
900 (get-val (getter compare)))
902 ((< target-val get-val)
903 (set! end (1- compare)))
904 ((< get-val target-val)
905 (set! start (1+ compare))))
906 (binary-search start end getter target-val))))
908 (define-public (car< a b)
911 (define-public (car<= a b)
912 (<= (car a) (car b)))
914 (define-public (symbol<? lst r)
915 (string<? (symbol->string lst) (symbol->string r)))
917 (define-public (symbol-key<? lst r)
918 (string<? (symbol->string (car lst)) (symbol->string (car r))))
920 (define-public (eval-carefully symbol module . default)
921 "Check whether all symbols in expr @var{symbol} are reachable
922 in module @var{module}. In that case evaluate, otherwise
923 print a warning and set an optional @var{default}."
924 (let* ((unavailable? (lambda (sym)
925 (not (module-defined? module sym))))
926 (sym-unavailable (if (pair? symbol)
929 (filter symbol? (flatten-list symbol)))
930 (if (unavailable? symbol)
933 (if (null? sym-unavailable)
935 (let* ((def (and (pair? default) (car default))))
936 (ly:programming-error
937 "cannot evaluate ~S in module ~S, setting to ~S"
938 (object->string symbol)
939 (object->string module)
940 (object->string def))
944 ;; don't confuse users with #<procedure .. > syntax.
946 (define-public (scm->string val)
947 (if (and (procedure? val)
948 (symbol? (procedure-name val)))
949 (symbol->string (procedure-name val))
951 (if (self-evaluating? val)
956 (call-with-output-string (lambda (port) (display val port)))
961 (define-public (!= lst r)
964 (define-public lily-unit->bigpoint-factor
966 ((equal? (ly:unit) "mm") (/ 72.0 25.4))
967 ((equal? (ly:unit) "pt") (/ 72.0 72.27))
968 (else (ly:error (_ "unknown unit: ~S") (ly:unit)))))
970 (define-public lily-unit->mm-factor
971 (* 25.4 (/ lily-unit->bigpoint-factor 72)))
973 ;;; FONT may be font smob, or pango font string...
974 (define-public (font-name-style font)
976 (string-downcase font)
977 (let* ((font-name (ly:font-name font))
978 (full-name (if font-name font-name (ly:font-file-name font))))
979 (string-downcase full-name))))
981 (define-public (modified-font-metric-font-scaling font)
982 (let* ((designsize (ly:font-design-size font))
983 (magnification (* (ly:font-magnification font)))
984 (scaling (* magnification designsize)))
985 (debugf "scaling:~S\n" scaling)
986 (debugf "magnification:~S\n" magnification)
987 (debugf "design:~S\n" designsize)
990 (define-public (version-not-seen-message input-file-name)
992 (ly:format "~a:0" input-file-name)
993 (_ "no \\version statement found, please add~afor future compatibility")
994 (format #f "\n\n\\version ~s\n\n" (lilypond-version))))
996 (define-public (old-relative-not-used-message input-file-name)
998 (ly:format "~a:0" input-file-name)
999 (_ "old relative compatibility not used")))