;;;; This file is part of LilyPond, the GNU music typesetter.
;;;;
-;;;; (c) 1998--2009 Han-Wen Nienhuys <hanwen@xs4all.nl>
+;;;; (c) 1998--2012 Han-Wen Nienhuys <hanwen@xs4all.nl>
;;;; Jan Nieuwenhuizen <janneke@gnu.org>
;;;;
;;;; LilyPond is free software: you can redistribute it and/or modify
;;;; along with LilyPond. If not, see <http://www.gnu.org/licenses/>.
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+;; clefs
+
+(define-public (clef-octavation-markup oct style)
+ "The octavation sign formatting function. @var{oct} is supposed to be
+a string holding the octavation number, @var{style} determines the
+way the octavation number is displayed."
+ (let* ((delim (if (symbol? style)
+ (case style
+ ((parenthesized) (cons "(" ")"))
+ ((bracketed) (cons "[" "]"))
+ (else (cons "" "")))
+ (cons "" "")))
+ (text (string-concatenate (list (car delim) oct (cdr delim)))))
+
+ (make-vcenter-markup text)))
+
+
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;; metronome marks
-(define-public (format-metronome-markup text dur count context)
- (let* ((hide-note (eq? #t (ly:context-property context 'tempoHideNote))))
+(define-public (format-metronome-markup event context)
+ (let ((hide-note (ly:context-property context 'tempoHideNote #f))
+ (text (ly:event-property event 'text))
+ (dur (ly:event-property event 'tempo-unit))
+ (count (ly:event-property event 'metronome-count)))
+
(metronome-markup text dur count hide-note)))
(define-public (metronome-markup text dur count hide-note)
(ly:duration-dot-count dur)
1))
#f))
- (note-markup (if (and (not hide-note) (number? count) (> count 0) )
+ (count-markup (cond ((number? count)
+ (if (> count 0)
+ (make-simple-markup (number->string count))
+ #f))
+ ((pair? count)
+ (make-concat-markup
+ (list
+ (make-simple-markup (number->string (car count)))
+ (make-simple-markup " ")
+ (make-simple-markup "–")
+ (make-simple-markup " ")
+ (make-simple-markup (number->string (cdr count))))))
+ (else #f)))
+ (note-markup (if (and (not hide-note) count-markup)
(make-concat-markup
(list
(make-general-align-markup Y DOWN note-mark)
(make-simple-markup " ")
(make-simple-markup "=")
(make-simple-markup " ")
- (make-simple-markup (number->string count))))
+ count-markup))
#f))
(text-markup (if (not (null? text))
(make-bold-markup text)
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;; fret diagrams
-(define-public (determine-frets context grob notes string-numbers)
+(define (create-fretboard context grob placement-list)
+ "Convert @var{placement-list} into a fretboard @var{grob}."
- (define (ensure-number a b)
- (if (number? a)
- a
- b))
+ (let* ((tunings (ly:context-property context 'stringTunings))
+ (my-string-count (length tunings))
+ (details (ly:grob-property grob 'fret-diagram-details)))
- (define (string-frets->dot-placement string-frets string-count)
- (let* ((desc (list->vector
- (map (lambda (x) (list 'mute (1+ x)))
- (iota string-count)))))
+ ;; Add string-count from string-tunings to fret-diagram-details.
+ (set! (ly:grob-property grob 'fret-diagram-details)
+ (acons 'string-count my-string-count details))
+ ;; Create the dot-placement list for the grob
+ (set! (ly:grob-property grob 'dot-placement-list) placement-list)))
+
+(define-public
+ (determine-frets context notes specified-info . rest)
+ "Determine string numbers and frets for playing @var{notes}
+as a chord, given specified information @var{specified-info}.
+@var{specified-info} is a list with two list elements,
+specified strings @code{defined-strings} and
+specified fingerings @code{defined-fingers}. Only a fingering of@tie{}0
+will affect the fret selection, as it specifies an open string.
+If @code{defined-strings} is @code{'()}, the context property
+@code{defaultStrings} will be used as a list of defined strings.
+Will look for predefined fretboards if @code{predefinedFretboardTable}
+is not @code {#f}. If @var{rest} is present, it contains the
+@code{FretBoard} grob, and a fretboard will be
+created. Otherwise, a list of @code{(string fret finger)} lists will
+be returned."
+
+ ;; helper functions
+
+ (define (string-frets->placement-list string-frets string-count)
+ "Convert @var{string-frets} to @code{fret-diagram-verbose}
+dot placement entries."
+ (let* ((placements (list->vector
+ (map (lambda (x) (list 'mute x))
+ (iota string-count 1)))))
(for-each (lambda (sf)
(let* ((string (car sf))
(fret (cadr sf))
(finger (caddr sf)))
-
(vector-set!
- desc (1- string)
- (if (= 0 fret)
- (list 'open string)
- (if finger
- (list 'place-fret string fret finger)
- (list 'place-fret string fret))))))
+ placements
+ (1- string)
+ (if (= 0 fret)
+ (list 'open string)
+ (if finger
+ (list 'place-fret string fret finger)
+ (list 'place-fret string fret))))))
string-frets)
+ (vector->list placements)))
+
+ (define (placement-list->string-frets placement-list)
+ "Convert @var{placement-list} to string-fret list."
+ (map (lambda (x) (if (eq? (car x) 'place-fret)
+ (cdr x)
+ (list (cadr x) 0)))
+ (filter (lambda (l) (or (eq? (car l) 'place-fret)
+ (eq? (car l) 'open)))
+ placement-list)))
+
+ (define (entry-count art-list)
+ "Count the number of entries in a list of articulations."
+ (length (filter (lambda (x) (not (null? x)))
+ art-list)))
+
+ (define (string-number event)
+ "Get the string-number from @var{event}. Return @var{#f}
+if no string-number is present."
+ (let ((num (ly:event-property event 'string-number)))
+ (and (integer? num) (positive? num) num)))
+
+ (define (determine-frets-and-strings
+ notes
+ defined-strings
+ defined-fingers
+ minimum-fret
+ maximum-stretch
+ tuning)
+ "Determine the frets and strings used to play the notes in
+@var{notes}, given @var{defined-strings} and @var{defined-fingers}
+along with @var{minimum-fret}, @var{maximum-stretch}, and
+@var{tuning}. Returns a list of @code{(string fret finger) lists."
+
+
+ (define restrain-open-strings (ly:context-property context
+ 'restrainOpenStrings
+ #f))
+ (define specified-frets '())
+ (define free-strings (iota (length tuning) 1))
+
+ (define (calc-fret pitch string tuning)
+ "Calculate the fret to play @var{pitch} on @var{string} with
+@var{tuning}."
+ (* 2 (- (ly:pitch-tones pitch) (ly:pitch-tones (list-ref tuning (1- string))))))
+
+ (define (note-pitch note)
+ "Get the pitch (in semitones) from @var{note}."
+ (ly:event-property note 'pitch))
+
+ (define (note-finger ev)
+ "Get the fingering from @var{ev}. Return @var{#f}
+if no fingering is present."
+ (let* ((articulations (ly:event-property ev 'articulations))
+ (finger-found #f))
+ (map (lambda (art)
+ (let* ((num (ly:event-property art 'digit)))
+
+ (if (and (ly:in-event-class? art 'fingering-event)
+ (number? num)
+ (> num 0))
+ (set! finger-found num))))
+ articulations)
+ finger-found))
- (vector->list desc)))
+ (define (delete-free-string string)
+ (if (number? string)
+ (set! free-strings
+ (delete string free-strings))))
+
+ (define (close-enough fret)
+ "Decide if @var{fret} is acceptable, given the already used frets."
+ (if (null? specified-frets)
+ #t
+ (reduce
+ (lambda (x y)
+ (and x y))
+ #t
+ (map (lambda (specced-fret)
+ (or (eq? 0 specced-fret)
+ (and (not restrain-open-strings)
+ (eq? 0 fret))
+ (>= maximum-stretch (abs (- fret specced-fret)))))
+ specified-frets))))
+
+ (define (string-qualifies string pitch)
+ "Can @var{pitch} be played on @var{string}, given already placed
+notes?"
+ (let* ((fret (calc-fret pitch string tuning)))
+ (and (or (and (not restrain-open-strings)
+ (eq? fret 0))
+ (>= fret minimum-fret))
+ (integer? fret)
+ (close-enough fret))))
+
+ (define (open-string string pitch)
+ "Is @var{pitch} and open-string note on @var{string}, given
+the current tuning?"
+ (let* ((fret (calc-fret pitch string tuning)))
+ (eq? fret 0)))
+
+ (define (set-fret! pitch-entry string finger)
+ (let ((this-fret (calc-fret (car pitch-entry)
+ string
+ tuning)))
+ (if (< this-fret 0)
+ (ly:warning (_ "Negative fret for pitch ~a on string ~a")
+ (car pitch-entry) string)
+ (if (not (integer? this-fret))
+ (ly:warning (_ "Missing fret for pitch ~a on string ~a")
+ (car pitch-entry) string)))
+ (delete-free-string string)
+ (set! specified-frets (cons this-fret specified-frets))
+ (list-set! string-fret-fingers
+ (cdr pitch-entry)
+ (list string this-fret finger))))
+
+ (define (kill-note! string-fret-fingers note-index)
+ (list-set! string-fret-fingers note-index (list #f #t)))
+
+ (define string-fret-fingers
+ (map (lambda (string finger)
+ (if (null? finger)
+ (list string #f)
+ (list string #f finger)))
+ defined-strings defined-fingers))
+
+ ;;; body of determine-frets-and-strings
+ (let* ((pitches (map note-pitch notes))
+ (pitch-alist (map cons pitches (iota (length pitches)))))
+
+ ;; handle notes with strings assigned and fingering of 0
+ (for-each
+ (lambda (pitch-entry string-fret-finger)
+ (let* ((string (list-ref string-fret-finger 0))
+ (finger (if (eq? (length string-fret-finger) 3)
+ (list-ref string-fret-finger 2)
+ '()))
+ (pitch (car pitch-entry))
+ (digit (if (null? finger)
+ #f
+ finger)))
+ (if (or (not (null? string))
+ (eq? digit 0))
+ (if (eq? digit 0)
+ ;; here we handle fingers of 0 -- open strings
+ (let ((fit-string
+ (find (lambda (string)
+ (open-string string pitch))
+ free-strings)))
+ (if fit-string
+ (set-fret! pitch-entry fit-string #f)
+ (ly:warning (_ "No open string for pitch ~a")
+ pitch)))
+ ;; here we handle assigned strings
+ (let ((this-fret
+ (calc-fret pitch string tuning))
+ (handle-negative
+ (ly:context-property context
+ 'handleNegativeFrets
+ 'recalculate)))
+ (cond ((or (and (>= this-fret 0) (integer? this-fret))
+ (eq? handle-negative 'include))
+ (set-fret! pitch-entry string finger))
+ ((eq? handle-negative 'recalculate)
+ (begin
+ (ly:warning
+ (_ "Requested string for pitch requires negative fret: string ~a pitch ~a")
+ string
+ pitch)
+ (ly:warning (_ "Ignoring string request and recalculating."))
+ (list-set! string-fret-fingers
+ (cdr pitch-entry)
+ (if (null? finger)
+ (list '() #f)
+ (list '() #f finger)))))
+ ((eq? handle-negative 'ignore)
+ (begin
+ (ly:warning
+ (_ "Requested string for pitch requires negative fret: string ~a pitch ~a")
+ string
+ pitch)
+ (ly:warning (_ "Ignoring note in tablature."))
+ (kill-note! string-fret-fingers
+ (cdr pitch-entry))))))))))
+ pitch-alist string-fret-fingers)
+ ;; handle notes without strings assigned -- sorted by pitch, so
+ ;; we need to use the alist to have the note number available
+ (for-each
+ (lambda (pitch-entry)
+ (let* ((string-fret-finger (list-ref string-fret-fingers
+ (cdr pitch-entry)))
+ (string (list-ref string-fret-finger 0))
+ (finger (if (eq? (length string-fret-finger) 3)
+ (list-ref string-fret-finger 2)
+ '()))
+ (pitch (car pitch-entry))
+ (fit-string
+ (find (lambda (string)
+ (string-qualifies string pitch))
+ free-strings)))
+ (if (not (list-ref string-fret-finger 1))
+ (if fit-string
+ (set-fret! pitch-entry fit-string finger)
+ (begin
+ (ly:warning (_ "No string for pitch ~a (given frets ~a)")
+ pitch
+ specified-frets)
+ (kill-note! string-fret-fingers
+ (cdr pitch-entry)))))))
+ (sort pitch-alist (lambda (pitch-entry-a pitch-entry-b)
+ (ly:pitch<? (car pitch-entry-b)
+ (car pitch-entry-a)))))
+ string-fret-fingers)) ;; end of determine-frets-and-strings
(define (get-predefined-fretboard predefined-fret-table tuning pitches)
-; (_i "Search through @var{predefined-fret-table} looking for a predefined
-;fretboard with a key of @var{(tuning . pitches)}. The search will check
-;both up and down an octave in order to accomodate transposition of the
-;chords.")
+ "Search through @var{predefined-fret-table} looking for a predefined
+fretboard with a key of @var{(tuning . pitches)}. The search will check
+both up and down an octave in order to accomodate transposition of the
+chords. Returns a placement-list."
+
(define (get-fretboard key)
(let ((hash-handle
(hash-get-handle predefined-fret-table key)))
(cdr hash-handle) ; return table entry
'())))
+ ;; body of get-predefined-fretboard
(let ((test-fretboard (get-fretboard (cons tuning pitches))))
(if (not (null? test-fretboard))
test-fretboard
(cons tuning (map (lambda (x) (shift-octave x -1))
pitches))))))))
-;; body.
- (let* ((tunings (ly:context-property context 'stringTunings))
- (my-string-count (length tunings))
- (details (ly:grob-property grob 'fret-diagram-details))
- (predefined-frets
+ ;; body of determine-frets
+ (let* ((predefined-fret-table
(ly:context-property context 'predefinedDiagramTable))
+ (tunings (ly:context-property context 'stringTunings))
+ (string-count (length tunings))
+ (grob (if (null? rest) '() (car rest)))
(pitches (map (lambda (x) (ly:event-property x 'pitch)) notes))
+ (defined-strings (map (lambda (x)
+ (if (null? x)
+ x
+ (or (string-number x) '())))
+ (car specified-info)))
+ (defined-fingers (map (lambda (x)
+ (if (null? x)
+ x
+ (ly:event-property x 'digit)))
+ (cadr specified-info)))
+ (default-strings (ly:context-property context 'defaultStrings '()))
+ (strings-used (if (and (zero? (entry-count defined-strings))
+ (not (zero? (entry-count default-strings))))
+ default-strings
+ defined-strings))
(predefined-fretboard
- (if predefined-frets
+ (if predefined-fret-table
(get-predefined-fretboard
- predefined-frets
+ predefined-fret-table
tunings
pitches)
'())))
+ (if (null? predefined-fretboard)
+ (let ((string-frets
+ (determine-frets-and-strings
+ notes
+ strings-used
+ defined-fingers
+ (ly:context-property context 'minimumFret 0)
+ (ly:context-property context 'maximumFretStretch 4)
+ tunings)))
+ (if (null? grob)
+ string-frets
+ (create-fretboard
+ context grob (string-frets->placement-list
+ (filter (lambda (entry)
+ (car entry))
+ string-frets)
+ string-count))))
+ (if (null? grob)
+ (placement-list->string-frets predefined-fretboard)
+ (create-fretboard context grob predefined-fretboard)))))
- (set! (ly:grob-property grob 'fret-diagram-details)
- (if (null? details)
- (acons 'string-count my-string-count '())
- (acons 'string-count my-string-count details)))
-
- (set! (ly:grob-property grob 'dot-placement-list)
- (if (not (null? predefined-fretboard))
- predefined-fretboard
- (let* ((minimum-fret
- (ensure-number
- (ly:context-property context 'minimumFret)
- 0))
- (max-stretch
- (ensure-number
- (ly:context-property context 'maximumFretStretch)
- 4))
- (string-frets
- (determine-frets-mf
- notes
- string-numbers
- minimum-fret
- max-stretch
- tunings)))
- (string-frets->dot-placement
- string-frets
- my-string-count))))))
-
-(define-public (determine-frets-mf notes string-numbers
- minimum-fret max-stretch
- tunings)
-
- (define (calc-fret pitch string tuning)
- (- (ly:pitch-semitones pitch) (list-ref tuning (1- string))))
-
- (define (note-pitch a)
- (ly:event-property a 'pitch))
-
- (define (note-pitch>? a b)
- (ly:pitch<? (note-pitch b)
- (note-pitch a)))
-
- (define (note-finger ev)
- (let* ((articulations (ly:event-property ev 'articulations))
- (finger-found #f))
-
- (map (lambda (art)
- (let* ((num (ly:event-property art 'digit)))
-
- (if (and (eq? 'fingering-event (ly:event-property art 'class))
- (number? num))
- (set! finger-found num))))
- articulations)
-
- finger-found))
-
- (define (note-string ev)
- (let* ((articulations (ly:event-property ev 'articulations))
- (string-found #f))
-
- (map (lambda (art)
- (let* ((num (ly:event-property art 'string-number)))
-
- (if (number? num)
- (set! string-found num))))
- articulations)
-
- string-found))
-
- (define (del-string string)
- (if (number? string)
- (set! free-strings
- (delete string free-strings))))
-
- (define specified-frets '())
- (define free-strings '())
-
- (define (close-enough fret)
- (reduce
- (lambda (x y)
- (and x y))
- #t
- (map (lambda (specced-fret)
- (> max-stretch (abs (- fret specced-fret))))
- specified-frets)))
-
- (define (string-qualifies string pitch)
- (let* ((fret (calc-fret pitch string tunings)))
- (and (>= fret minimum-fret)
- (close-enough fret))))
-
- (define string-fret-fingering-tuples '())
- (define (set-fret note string)
- (set! string-fret-fingering-tuples
- (cons (list string
- (calc-fret (ly:event-property note 'pitch)
- string tunings)
- (note-finger note))
- string-fret-fingering-tuples))
- (del-string string))
-
-
- ;;; body.
- (set! specified-frets
- (filter identity (map
- (lambda (note)
- (if (note-string note)
- (calc-fret (note-pitch note)
- (note-string note) tunings)
- #f))
- notes)))
-
- (set! free-strings (map 1+ (iota (length tunings))))
-
- (for-each (lambda (note)
- (del-string (note-string note)))
- notes)
-
-
- (for-each
- (lambda (note)
- (if (note-string note)
- (set-fret note (note-string note))
- (let* ((fit-string (find (lambda (string)
- (string-qualifies string (note-pitch note)))
- free-strings)))
- (if fit-string
- (set-fret note fit-string)
- (ly:warning "No string for pitch ~a (given frets ~a)"
- (note-pitch note)
- specified-frets)))))
- (sort notes note-pitch>?))
-
- string-fret-fingering-tuples)
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;; Calculate the fret from pitch and string number as letter
;; The fret letter is taken from 'fretLabels if present
-(define-public (fret-letter-tablature-format string-number context event)
- (let* ((tuning (ly:context-property context 'stringTunings))
- (pitch (ly:event-property event 'pitch))
- (labels (ly:context-property context 'fretLabels))
- (fret (- (ly:pitch-semitones pitch)
- (list-ref tuning (- string-number 1)))))
- (make-vcenter-markup
- (cond
- ((= 0 (length labels))
- (string (integer->char (+ fret (char->integer #\a)))))
- ((and (<= 0 fret) (< fret (length labels)))
- (list-ref labels fret))
- (else
- (ly:warning "No label for fret ~a (~a on string ~a);
-only ~a fret labels provided"
- fret pitch string-number (length labels))
- ".")))))
-
-;; Calculate the fret from pitch and string number as number
-(define-public (fret-number-tablature-format string-number context event)
- (let* ((tuning (ly:context-property context 'stringTunings))
- (pitch (ly:event-property event 'pitch)))
- (make-vcenter-markup
- (format
- "~a"
- (- (ly:pitch-semitones pitch)
- (list-ref tuning
- ;; remove 1 because list index starts at 0
- ;;and guitar string at 1.
- (1- string-number)))))))
+(define-public (fret-letter-tablature-format
+ context string-number fret-number)
+ (let ((labels (ly:context-property context 'fretLabels)))
+ (make-vcenter-markup
+ (cond
+ ((= 0 (length labels))
+ (string (integer->char (+ fret-number (char->integer #\a)))))
+ ((and (<= 0 fret-number) (< fret-number (length labels)))
+ (list-ref labels fret-number))
+ (else
+ (ly:warning (_ "No label for fret ~a (on string ~a);
+only ~a fret labels provided")
+ fret-number string-number (length labels))
+ ".")))))
+
+;; Display the fret number as a number
+(define-public (fret-number-tablature-format
+ context string-number fret-number)
+ (make-vcenter-markup
+ (format #f "~a" fret-number)))
;; The 5-string banjo has got a extra string, the fifth (duh), which
;; starts at the fifth fret on the neck. Frets on the fifth string
;; the "first fret" on the fifth string is really the sixth fret
;; on the banjo neck.
;; We solve this by defining a new fret-number-tablature function:
-(define-public (fret-number-tablature-format-banjo string-number context event)
- (let* ((tuning (ly:context-property context 'stringTunings))
- (pitch (ly:event-property event 'pitch)))
- (make-vcenter-markup
- (let ((fret (- (ly:pitch-semitones pitch)
- (list-ref tuning (1- string-number)))))
- (number->string (cond
- ((and (> fret 0) (= string-number 5))
- (+ fret 5))
- (else fret)))))))
-
+(define-public (fret-number-tablature-format-banjo
+ context string-number fret-number)
+ (make-vcenter-markup
+ (number->string (cond
+ ((and (> fret-number 0) (= string-number 5))
+ (+ fret-number 5))
+ (else fret-number)))))
+
+;; Tab note head staff position functions
+;;
+;; Define where in the staff to display a given string. Some forms of
+;; tablature put the tab note heads in the spaces, rather than on the
+;; lines
+
+(define-public (tablature-position-on-lines context string-number)
+ (let* ((string-tunings (ly:context-property context 'stringTunings))
+ (string-count (length string-tunings))
+ (string-one-topmost (ly:context-property context 'stringOneTopmost))
+ (staff-line (- (* 2 string-number) string-count 1)))
+ (if string-one-topmost
+ (- staff-line)
+ staff-line)))
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;; bar numbers
-(define-public ((every-nth-bar-number-visible n) barnum)
+(define-public ((every-nth-bar-number-visible n) barnum mp)
(= 0 (modulo barnum n)))
-(define-public ((modulo-bar-number-visible n m) barnum)
+(define-public ((modulo-bar-number-visible n m) barnum mp)
(and (> barnum 1) (= m (modulo barnum n))))
(define-public ((set-bar-number-visibility n) tr)
(ly:context-set-property! tr 'barNumberVisibility
(modulo-bar-number-visible n (modulo bn n)))))
-(define-public (first-bar-number-invisible barnum) (> barnum 1))
-
-(define-public (all-bar-numbers-visible barnum) #t)
+(define-public (first-bar-number-invisible barnum mp)
+ (> barnum 1))
+
+(define-public (first-bar-number-invisible-save-broken-bars barnum mp)
+ (or (> barnum 1)
+ (> (ly:moment-main-numerator mp) 0)))
+
+(define-public (first-bar-number-invisible-and-no-parenthesized-bar-numbers barnum mp)
+ (and (> barnum 1)
+ (= (ly:moment-main-numerator mp) 0)))
+
+(define-public (robust-bar-number-function barnum measure-pos alt-number context)
+ (define (get-number-and-power an pow)
+ (if (<= an alt-number)
+ (get-number-and-power (+ an (expt 26 (1+ pow))) (1+ pow))
+ (cons (+ alt-number (- (expt 26 pow) an)) (1- pow))))
+ (define (make-letter so-far an pow)
+ (if (< pow 0)
+ so-far
+ (let ((pos (modulo (quotient an (expt 26 pow)) 26)))
+ (make-letter (string-append so-far
+ (substring "abcdefghijklmnopqrstuvwxyz"
+ pos
+ (1+ pos)))
+ an
+ (1- pow)))))
+ (let* ((number-and-power (get-number-and-power 0 0))
+ (begin-measure (= 0 (ly:moment-main-numerator measure-pos)))
+ (maybe-open-parenthesis (if begin-measure "" "("))
+ (maybe-close-parenthesis (if begin-measure "" ")")))
+ (markup (string-append maybe-open-parenthesis
+ (number->string barnum)
+ (make-letter ""
+ (car number-and-power)
+ (cdr number-and-power))
+ maybe-close-parenthesis))))
+
+(define-public (all-bar-numbers-visible barnum mp) #t)
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
(= 0 (modulo count n)))
(define-public (all-repeat-counts-visible count context) #t)
+
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+;; make-engraver helper macro
+
+(defmacro-public make-engraver forms
+ "Helper macro for creating Scheme engravers.
+
+The usual form for an engraver is an association list (or alist)
+mapping symbols to either anonymous functions or to another such
+alist.
+
+@code{make-engraver} accepts forms where the first element is either
+an argument list starting with the respective symbol, followed by the
+function body (comparable to the way @code{define} is used for
+defining functions), or a single symbol followed by subordinate forms
+in the same manner. You can also just make an alist pair
+literally (the @samp{car} is quoted automatically) as long as the
+unevaluated @samp{cdr} is not a pair. This is useful if you already
+have defined your engraver functions separately.
+
+Symbols mapping to a function would be @code{initialize},
+@code{start-translation-timestep}, @code{process-music},
+@code{process-acknowledged}, @code{stop-translation-timestep}, and
+@code{finalize}. Symbols mapping to another alist specified in the
+same manner are @code{listeners} with the subordinate symbols being
+event classes, and @code{acknowledgers} and @code{end-acknowledgers}
+with the subordinate symbols being interfaces."
+ (let loop ((forms forms))
+ (if (cheap-list? forms)
+ `(list
+ ,@(map (lambda (form)
+ (if (pair? (car form))
+ `(cons ',(caar form) (lambda ,(cdar form) ,@(cdr form)))
+ `(cons ',(car form) ,(loop (cdr form)))))
+ forms))
+ forms)))
projects / lilypond.git / blobdiff