+;;;;
;;;; lily-library.scm -- utilities
;;;;
;;;; source file of the GNU LilyPond music typesetter
))
-(define-public (paper-system-title? system)
- (equal? #t (ly:prob-property system 'is-title)
- ))
-
-(define-public (paper-system-stencil system)
- (ly:prob-property system 'stencil))
-
-(define-public (paper-system-extent system axis)
- (ly:stencil-extent (paper-system-stencil system) axis))
-
;;;;;;;;;;;;;;;;
;; alist
(define-public assoc-get ly:assoc-get)
(if (not (defined? 'hash-table?)) ;; guile 1.6 compat
(begin
(define hash-table? vector?)
-
+ (define-public (hash-for-each proc tab)
+ (hash-fold (lambda (k v prior)
+ (proc k v)
+ #f)
+ #f
+ tab))
(define-public (hash-table->alist t)
"Convert table t to list"
(apply append (vector->list t))))
(cons (cons (car coords) (cadr coords))
(ly:list->offsets accum (cddr coords)))))
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+;; intervals
+
(define-public (interval-length x)
"Length of the number-pair X, when an interval"
(max 0 (- (cdr x) (car x))))
(define-public (interval-center x)
"Center the number-pair X, when an interval"
- (/ (+ (car x) (cdr x)) 2))
+ (if (interval-empty? x)
+ 0.0
+ (/ (+ (car x) (cdr x)) 2)))
(define-public interval-start car)
(define-public interval-end cdr)
(cons (min (car i1) (car i2))
(max (cdr i1) (cdr i2))))
+(define-public (interval-sane? i)
+ (not (or (nan? (car i))
+ (inf? (car i))
+ (nan? (cdr i))
+ (inf? (cdr i)))))
+
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+;;
+
+
(define-public (write-me message x)
"Return X. Display MESSAGE and write X. Handy for debugging,
possibly turned off."