/usr/share/lilypond/2.14.2/scm/tablature.scm is in lilypond-data 2.14.2-4.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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;;;;
;;;; Copyright (C) 2009--2011 Marc Hohl <marc@hohlart.de>
;;;;
;;;; 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/>.
;; for more control over glyph-name calculations,
;; we use a custom callback for tab note heads
;; which will ignore 'style = 'do
(define-public (tab-note-head::calc-glyph-name grob)
(let ((style (ly:grob-property grob 'style)))
(case style
((cross) "2cross"))))
;; ensure we only call note head callback when
;; 'style = 'cross
(define-public (tab-note-head::whiteout-if-style-set grob)
(let ((style (ly:grob-property grob 'style)))
(if (and (symbol? style)
(eq? style 'cross))
(stencil-whiteout (ly:note-head::print grob))
(tab-note-head::print grob))))
;; definitions for the "moderntab" clef:
;; the "moderntab" clef will be added to the list of known clefs,
;; so it can be used as any other clef: \clef "moderntab"
(add-new-clef "moderntab" "markup.moderntab" 0 0 0)
;; define sans serif-style tab-Clefs as a markup:
(define-markup-command (customTabClef
layout props num-strings staff-space)
(integer? number?)
#:category music
"Draw a tab clef sans-serif style."
(define (square x) (* x x))
(let* ((scale-factor (/ staff-space 1.5))
(font-size (- (* num-strings 1.5 scale-factor) 7))
(base-skip (* (square (+ (* num-strings 0.195) 0.4)) scale-factor)))
(interpret-markup layout props
(markup #:vcenter #:bold
#:override (cons 'font-family 'sans)
#:fontsize font-size
#:override (cons 'baseline-skip base-skip)
#:left-align #:center-column ("T" "A" "B")))))
;; this function decides which clef to take
(define-public (clef::print-modern-tab-if-set grob)
(let ((glyph (ly:grob-property grob 'glyph)))
;; which clef is wanted?
(if (string=? glyph "markup.moderntab")
;; if it is "moderntab", we'll draw it
(let* ((staff-symbol (ly:grob-object grob 'staff-symbol))
(line-count (if (ly:grob? staff-symbol)
(ly:grob-property staff-symbol 'line-count)
0))
(staff-space (ly:staff-symbol-staff-space grob)))
(grob-interpret-markup grob (make-customTabClef-markup line-count
staff-space)))
;; otherwise, we simply use the default printing routine
(ly:clef::print grob))))
;; if stems are drawn, it is nice to have a double stem for
;; (dotted) half notes to distinguish them from quarter notes:
(define-public (tabvoice::draw-double-stem-for-half-notes grob)
(let ((stem (ly:stem::print grob)))
;; is the note a (dotted) half note?
(if (= 1 (ly:grob-property grob 'duration-log))
;; yes -> draw double stem
(ly:stencil-combine-at-edge stem X RIGHT stem 0.5)
;; no -> draw simple stem
stem)))
;; as default, the glissando line between fret numbers goes
;; upwards, here we have a function to correct this behavior:
(define-public (glissando::calc-tab-extra-dy grob)
(let* ((original (ly:grob-original grob))
(left-bound (ly:spanner-bound original LEFT))
(right-bound (ly:spanner-bound original RIGHT))
(left-pitch (ly:event-property (event-cause left-bound) 'pitch))
(right-pitch (ly:event-property (event-cause right-bound) 'pitch)))
(if (< (ly:pitch-semitones right-pitch) (ly:pitch-semitones left-pitch))
-0.75
0.75)))
;; the handler for ties in tablature; according to TabNoteHead #'details,
;; the 'tied to' note is handled differently after a line break
(define-public (tie::handle-tab-note-head grob)
(let* ((original (ly:grob-original grob))
(tied-tab-note-head (ly:spanner-bound grob RIGHT))
(spanner-start (ly:grob-property tied-tab-note-head 'span-start #f))
(siblings (if (ly:grob? original)
(ly:spanner-broken-into original) '())))
(if spanner-start
;; tab note head is right bound of a tie and left of spanner,
;; -> parenthesize it at all events
(begin
(ly:grob-set-property! tied-tab-note-head 'display-cautionary #t)
(ly:grob-set-property! tied-tab-note-head 'stencil tab-note-head::print))
;; otherwise, check whether tie is split:
(if (and (>= (length siblings) 2)
(eq? (car (last-pair siblings)) grob))
;; tie is split -> get TabNoteHead #'details
(let* ((details (ly:grob-property tied-tab-note-head 'details))
(tied-properties (assoc-get 'tied-properties details '()))
(tab-note-head-parenthesized (assoc-get 'parenthesize tied-properties #t))
;; we need the begin-of-line entry in the 'break-visibility vector
(tab-note-head-visible
(vector-ref (assoc-get 'break-visibility
tied-properties #(#f #f #t)) 2)))
(if tab-note-head-visible
;; tab note head is visible
(if tab-note-head-parenthesized
(begin
(ly:grob-set-property! tied-tab-note-head 'display-cautionary #t)
(ly:grob-set-property! tied-tab-note-head 'stencil tab-note-head::print)))
;; tab note head is invisible
(ly:grob-set-property! tied-tab-note-head 'transparent #t)))
;; tie is not split
(ly:grob-set-property! tied-tab-note-head 'transparent #t)))))
;; repeat ties occur within alternatives in a repeat construct;
;; TabNoteHead #'details handles the appearance in this case
(define-public (repeat-tie::handle-tab-note-head grob)
(let* ((tied-tab-note-head (ly:grob-object grob 'note-head))
(spanner-start (ly:grob-property tied-tab-note-head 'span-start #f)))
(if spanner-start
;; tab note head is between a tie and a slur/glissando
;; -> parenthesize it at all events
(begin
(ly:grob-set-property! tied-tab-note-head 'display-cautionary #t)
(ly:grob-set-property! tied-tab-note-head 'stencil tab-note-head::print))
;; otherwise check 'details
(let* ((details (ly:grob-property tied-tab-note-head 'details))
(repeat-tied-properties (assoc-get 'repeat-tied-properties details '()))
(tab-note-head-visible (assoc-get 'note-head-visible repeat-tied-properties #t))
(tab-note-head-parenthesized (assoc-get 'parenthesize repeat-tied-properties #t)))
(if tab-note-head-visible
;; tab note head is visible
(if tab-note-head-parenthesized
(begin
(ly:grob-set-property! tied-tab-note-head 'display-cautionary #t)
(ly:grob-set-property! tied-tab-note-head 'stencil tab-note-head::print)))
;; tab note head is invisible
(ly:grob-set-property! tied-tab-note-head 'transparent #t))))))
;; the slurs should not be too far apart from the corresponding fret number, so
;; we move the slur towards the TabNoteHeads; moreover, if the left fret number is
;; the right-bound of a tie, we'll set it in parentheses:
(define-public (slur::draw-tab-slur grob)
;; TODO: use a less "brute-force" method to decrease
;; the distance between the slur ends and the fret numbers
(let* ((original (ly:grob-original grob))
(left-bound (ly:spanner-bound original LEFT))
(left-tab-note-head (ly:grob-property left-bound 'cause))
(staff-space (ly:staff-symbol-staff-space grob))
(control-points (ly:grob-property grob 'control-points))
(new-control-points (map
(lambda (p)
(cons (car p)
(- (cdr p)
(* staff-space
(ly:grob-property grob 'direction)
0.35))))
control-points)))
(ly:grob-set-property! grob 'control-points new-control-points)
(ly:slur::print grob)))
;; The glissando routine works similarly to the slur routine; if the
;; fret number is "tied to", it should become parenthesized.
(define-public (glissando::draw-tab-glissando grob)
(let* ((original (ly:grob-original grob))
(left-tab-note-head (ly:spanner-bound original LEFT))
(cautionary (ly:grob-property left-tab-note-head 'display-cautionary #f)))
(and cautionary
;; increase left padding to avoid collision between
;; closing parenthesis and glissando line
(ly:grob-set-nested-property! grob '(bound-details left padding) 0.5))
(ly:line-spanner::print grob)))
;; for \tabFullNotation, the stem tremolo beams are too big in comparison to
;; normal staves; this wrapper function scales accordingly:
(define-public (stem-tremolo::calc-tab-width grob)
(let ((width (ly:stem-tremolo::calc-width grob))
(staff-space (ly:staff-symbol-staff-space grob)))
(/ width staff-space)))
;; a callback for custom fret labels
(define-public ((tab-note-head::print-custom-fret-label fret) grob)
(ly:grob-set-property! grob 'text fret)
(tab-note-head::print grob))
(define-public (tab-note-head::print grob)
(define (is-harmonic? grob)
(let ((arts (ly:event-property (event-cause grob) 'articulations)))
(or (pair? (filter (lambda (a)
(ly:in-event-class? a 'harmonic-event))
arts))
(eq? (ly:grob-property grob 'style) 'harmonic))))
(let* ((cautionary (ly:grob-property grob 'display-cautionary #f))
(details (ly:grob-property grob 'details '()))
(harmonic-props (assoc-get 'harmonic-properties details '()))
(harmonic-angularity (assoc-get 'angularity harmonic-props 2))
(harmonic-half-thick (assoc-get 'half-thickness harmonic-props 0.075))
(harmonic-padding (assoc-get 'padding harmonic-props 0))
(harmonic-proc (assoc-get 'procedure harmonic-props parenthesize-stencil))
(harmonic-width (assoc-get 'width harmonic-props 0.25))
(cautionary-props (assoc-get 'cautionary-properties details '()))
(cautionary-angularity (assoc-get 'angularity cautionary-props 2))
(cautionary-half-thick (assoc-get 'half-thickness cautionary-props 0.075))
(cautionary-padding (assoc-get 'padding cautionary-props 0))
(cautionary-proc (assoc-get 'procedure cautionary-props parenthesize-stencil))
(cautionary-width (assoc-get 'width cautionary-props 0.25))
(output-grob (ly:text-interface::print grob))
(ref-grob (grob-interpret-markup grob "8"))
(offset-factor (assoc-get 'head-offset details 3/5))
(column-offset (* offset-factor
(interval-length
(ly:stencil-extent
(grob-interpret-markup grob "8")
X)))))
(if (is-harmonic? grob)
(set! output-grob (harmonic-proc output-grob
harmonic-half-thick
harmonic-width
harmonic-angularity
harmonic-padding)))
(if cautionary
(set! output-grob (cautionary-proc output-grob
cautionary-half-thick
cautionary-width
cautionary-angularity
cautionary-padding)))
(ly:stencil-translate-axis (centered-stencil output-grob)
column-offset
X)))
;; Harmonic definitions
(define node-positions
;; for the node on m/n-th of the string length, we get the corresponding
;; (exact) fret position by calculating p=(-12/log 2)*log(1-(m/n));
;; since guitarists normally use the forth fret and not the 3.8th, here
;; are rounded values, ordered by
;; 1/2
;; 1/3 2/3
;; 1/4 2/4 3/4 etc.
;; The value for 2/4 is irrelevant in practical, bacause the string sounds
;; only one octave higher, not two, but since scheme normalizes the fractions
;; anyway, these values are simply placeholders for easier indexing.
;; According to the arithmetic sum, the position of m/n is at 1/2*(n-2)(n-1)+(m-1)
;; if we start counting from zero
(vector 12
7 19
5 12 24
4 9 16 28
3 7 12 19 31
2.7 5.8 9.7 14.7 21.7 33.7
2.3 5 8 12 17 24 36
2 4.4 7 10 14 19 26 38 ))
(define partial-pitch
(vector '(0 0 0)
'(1 0 0)
'(1 4 0)
'(2 0 0)
'(2 2 0)
'(2 4 0)
'(2 6 -1/2)
'(3 0 0)
'(3 1 0)))
(define fret-partials
'(("0" . 0)
("12" . 1)
("7" . 2)
("19" . 2)
("5" . 3)
("24" . 3)
("4" . 4)
("9" . 4)
("16" . 4)
("3" . 5)
("2.7" . 6)
("2.3" . 7)
("2" . 8)))
(define-public (ratio->fret ratio)
"Calculate a fret number given @var{ratio} for the harmonic."
(let* ((nom (numerator ratio))
(den (denominator ratio))
(index (+ (* (- den 2)
(- den 1)
1/2)
nom -1)))
(number->string (vector-ref node-positions index))))
(define-public (ratio->pitch ratio)
"Calculate a pitch given @var{ratio} for the harmonic."
(let* ((partial (1- (denominator ratio)))
(pitch (vector-ref partial-pitch partial)))
(ly:make-pitch (first pitch)
(second pitch)
(third pitch))))
(define-public (fret->pitch fret)
"Calculate a pitch given @var{fret} for the harmonic."
(let* ((partial (assoc-get fret fret-partials 0))
(pitch (vector-ref partial-pitch partial)))
(ly:make-pitch (first pitch)
(second pitch)
(third pitch))))
(define-public (calc-harmonic-pitch pitch music)
"Calculate the harmonic pitches in @var{music} given
@var{pitch} as the non-harmonic pitch."
(let ((es (ly:music-property music 'elements))
(e (ly:music-property music 'element))
(p (ly:music-property music 'pitch)))
(cond
((pair? es)
(ly:music-set-property! music 'elements
(map (lambda (x) (calc-harmonic-pitch pitch x)) es)))
((ly:music? e)
(ly:music-set-property! music 'element (calc-harmonic-pitch pitch e)))
((ly:pitch? p)
(begin
(set! p (ly:pitch-transpose p pitch))
(ly:music-set-property! music 'pitch p))))
music))
(define-public (make-harmonic mus)
"Convert music variable @var{mus} to harmonics."
(let ((elts (ly:music-property mus 'elements))
(elt (ly:music-property mus 'element)))
(cond
((pair? elts)
(map make-harmonic elts))
((ly:music? elt)
(make-harmonic elt))
((music-is-of-type? mus 'note-event)
(set! (ly:music-property mus 'articulations)
(append
(ly:music-property mus 'articulations)
(list (make-music 'HarmonicEvent))))))
mus))
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