(define-builtin-markup-command (draw-line layout props dest)
(number-pair?)
- "A simple line. Uses the @code{thickness} property. "
+ "A simple line. Uses the @code{thickness} property."
(let*
((th (chain-assoc-get 'thickness props 0.1))
(x (car dest))
- (y (cdr dest)))
+ (y (cdr dest))
+ (s (ly:make-stencil
+ `(draw-line
+ ,th
+ 0 0
+ ,x ,y)
- (ly:make-stencil
- `(draw-line
- ,th
- 0 0
- ,x ,y)
+ (cons (min x 0) (max x 0))
+ (cons (min y 0) (max y 0)))))
- (cons (min x 0) (min y 0))
- (cons (max x 0) (max y 0)))))
+ s))
(define-builtin-markup-command (draw-circle layout props radius thickness fill)
(number? number? boolean?)
(make-circle-stencil radius thickness fill))
(define-builtin-markup-command (triangle layout props filled) (boolean?)
- "A triangle, filled or not"
+ "A triangle, either filled or empty."
(let*
((th (chain-assoc-get 'thickness props 0.1))
(size (chain-assoc-get 'font-size props 0))
(circle-stencil m th pad)))
(define-builtin-markup-command (with-url layout props url arg) (string? markup?)
- "Add a link to URL @var{url} around @var{arg}. This only works in
+ "Add a link to URL @var{url} around @var{arg}. This only works in
the PDF backend."
(let* ((stil (interpret-markup layout props arg))
(xextent (ly:stencil-extent stil X))
(yextent (ly:stencil-extent stil Y))
(old-expr (ly:stencil-expr stil))
(url-expr (list 'url-link url `(quote ,xextent) `(quote ,yextent))))
+
(ly:stencil-add (ly:make-stencil url-expr xextent yextent) stil)))
@verbatim
\\filled-box #'(-.3 . 1.8) #'(-.3 . 1.8) #0
@end verbatim
-create a box extending horizontally from -0.3 to 1.8 and
+creates a box extending horizontally from -0.3 to 1.8 and
vertically from -0.3 up to 1.8, with corners formed from a
-circle of diameter 0 (ie sharp corners)."
+circle of diameter@tie{}0 (i.e. sharp corners)."
(ly:round-filled-box
xext yext blot))
(define-builtin-markup-command (whiteout layout props arg) (markup?)
- "Provide a white underground for @var{arg}"
+ "Provide a white underground for @var{arg}."
(stencil-whiteout (interpret-markup layout props arg)))
(define-builtin-markup-command (pad-markup layout props padding arg) (number? markup?)
;; todo: fix negative space
(define-builtin-markup-command (hspace layout props amount) (number?)
- "This produces a invisible object taking horizontal space.
+ "This produces a invisible object taking horizontal space. For example,
+
@example
\\markup @{ A \\hspace #2.0 B @}
@end example
-will put extra space between A and B, on top of the space that is
-normally inserted before elements on a line.
-"
+
+@noindent
+puts extra space between A and@tie{}B, on top of the space that is
+normally inserted before elements on a line."
(if (> amount 0)
(ly:make-stencil "" (cons 0 amount) '(-1 . 1))
(ly:make-stencil "" (cons amount amount) '(-1 . 1))))
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
(define-builtin-markup-command (stencil layout props stil) (ly:stencil?)
- "Stencil as markup"
+ "Use a stencil as markup."
stil)
(define bbox-regexp
#f)))
(define-builtin-markup-command (epsfile layout props axis size file-name) (number? number? string?)
- "Inline an EPS image. The image is scaled along @var{axis} to
+ "Inline an EPS image. The image is scaled along @var{axis} to
@var{size}."
(if (ly:get-option 'safe)
different scales should be used for the @TeX{} and PostScript backend,
selected with @code{-f}.
-
-For the TeX backend, the following string prints a rotated text
+For the @TeX{} backend, the following string prints a rotated text
@cindex rotated text
-@verbatim
+@example
0 0 moveto /ecrm10 findfont
1.75 scalefont setfont 90 rotate (hello) show
-@end verbatim
+@end example
@noindent
The magical constant 1.75 scales from LilyPond units (staff spaces) to
-TeX dimensions.
+@TeX{} dimensions.
For the postscript backend, use the following
-@verbatim
+@example
gsave /ecrm10 findfont
10.0 output-scale div
scalefont setfont 90 rotate (hello) show grestore
-@end verbatim
-"
+@end example"
;; FIXME
(ly:make-stencil
empty-stencil))))
(define-builtin-markup-command (null layout props) ()
- "An empty markup with extents of a single point"
+ "An empty markup with extents of a single point."
point-stencil)
(interpret-markup layout props str))
(define-builtin-markup-command (tied-lyric layout props str) (string?)
-
- "Like simple-markup, but use tie characters for ~ tilde symbols."
-
+ "Like simple-markup, but use tie characters for @q{~} tilde symbols."
(if (string-contains str "~")
(let*
((parts (string-split str #\~))
(define-builtin-markup-command (fill-line layout props markups)
(markup-list?)
"Put @var{markups} in a horizontal line of width @var{line-width}.
- The markups are spaced/flushed to fill the entire line.
- If there are no arguments, return an empty stencil."
+The markups are spaced or flushed to fill the entire line.
+If there are no arguments, return an empty stencil."
(let* ((orig-stencils
(map (lambda (x) (interpret-markup layout props x))
(define-builtin-markup-command (justify layout props args) (markup-list?)
"Like wordwrap, but with lines stretched to justify the margins.
-Use @code{\\override #'(line-width . X)} to set line-width, where X
-is the number of staff spaces."
-
+Use @code{\\override #'(line-width . @var{X})} to set the line width;
+@var{X}@tie{}is the number of staff spaces."
(wordwrap-markups layout props args #t))
(define-builtin-markup-command (wordwrap layout props args) (markup-list?)
- "Simple wordwrap. Use @code{\\override #'(line-width . X)} to set
-line-width, where X is the number of staff spaces."
+ "Simple wordwrap. Use @code{\\override #'(line-width . @var{X})} to set
+the line width, where @var{X} is the number of staff spaces."
(wordwrap-markups layout props args #f))
(define-builtin-markup-command (wordwrap-string layout props arg) (string?)
- "Wordwrap a string. Paragraphs may be separated with double newlines"
+ "Wordwrap a string. Paragraphs may be separated with double newlines."
(wordwrap-string layout props #f arg))
(define-builtin-markup-command (justify-string layout props arg) (string?)
- "Justify a string. Paragraphs may be separated with double newlines"
+ "Justify a string. Paragraphs may be separated with double newlines"
(wordwrap-string layout props #t arg))
(define-builtin-markup-command (wordwrap-field layout props symbol) (symbol?)
- (let* ((m (chain-assoc-get symbol props)))
- (if (string? m)
- (interpret-markup layout props
- (list wordwrap-string-markup m))
- (ly:make-stencil '() '(1 . -1) '(1 . -1)))))
+ "Wordwrap the data which has been assigned to @var{symbol}."
+ (let* ((m (chain-assoc-get symbol props)))
+ (if (string? m)
+ (interpret-markup layout props
+ (list wordwrap-string-markup m))
+ (ly:make-stencil '() '(1 . -1) '(1 . -1)))))
(define-builtin-markup-command (justify-field layout props symbol) (symbol?)
- (let* ((m (chain-assoc-get symbol props)))
- (if (string? m)
- (interpret-markup layout props
- (list justify-string-markup m))
- (ly:make-stencil '() '(1 . -1) '(1 . -1)))))
+ "Justify the data which has been assigned to @var{symbol}."
+ (let* ((m (chain-assoc-get symbol props)))
+ (if (string? m)
+ (interpret-markup layout props
+ (list justify-string-markup m))
+ (ly:make-stencil '() '(1 . -1) '(1 . -1)))))
(map (lambda (x) (interpret-markup layout props x)) args))))
(define-builtin-markup-command (center-align layout props args) (markup-list?)
- "Put @code{args} in a centered column. "
+ "Put @code{args} in a centered column."
(let* ((mols (map (lambda (x) (interpret-markup layout props x)) args))
(cmols (map (lambda (x) (ly:stencil-aligned-to x X CENTER)) mols)))
(stack-lines -1 0.0 (chain-assoc-get 'baseline-skip props) cmols)))
(define-builtin-markup-command (vcenter layout props arg) (markup?)
- "Align @code{arg} to its Y center. "
+ "Align @code{arg} to its Y@tie{}center."
(let* ((mol (interpret-markup layout props arg)))
(ly:stencil-aligned-to mol Y CENTER)))
(define-builtin-markup-command (hcenter layout props arg) (markup?)
- "Align @code{arg} to its X center. "
+ "Align @code{arg} to its X@tie{}center."
(let* ((mol (interpret-markup layout props arg)))
(ly:stencil-aligned-to mol X CENTER)))
(define-builtin-markup-command (right-align layout props arg) (markup?)
- "Align @var{arg} on its right edge. "
+ "Align @var{arg} on its right edge."
(let* ((m (interpret-markup layout props arg)))
(ly:stencil-aligned-to m X RIGHT)))
(define-builtin-markup-command (left-align layout props arg) (markup?)
- "Align @var{arg} on its left edge. "
+ "Align @var{arg} on its left edge."
(let* ((m (interpret-markup layout props arg)))
(ly:stencil-aligned-to m X LEFT)))
(ly:stencil-aligned-to m axis dir)))
(define-builtin-markup-command (halign layout props dir arg) (number? markup?)
- "Set horizontal alignment. If @var{dir} is @code{-1}, then it is
-left-aligned, while @code{+1} is right. Values in between interpolate
+ "Set horizontal alignment. If @var{dir} is @code{-1}, then it is
+left-aligned, while @code{+1} is right. Values inbetween interpolate
alignment accordingly."
(let* ((m (interpret-markup layout props arg)))
(ly:stencil-aligned-to m X dir)))
(define-builtin-markup-command (with-dimensions layout props x y arg) (number-pair? number-pair? markup?)
- "Set the dimensions of @var{arg} to @var{x} and @var{y}."
+ "Set the dimensions of @var{arg} to @var{x} and@tie{}@var{y}."
(let* ((m (interpret-markup layout props arg)))
(ly:make-stencil (ly:stencil-expr m) x y)))
(define-builtin-markup-command (pad-around layout props amount arg) (number? markup?)
-
- "Add padding @var{amount} all around @var{arg}. "
+ "Add padding @var{amount} all around @var{arg}."
(let*
((m (interpret-markup layout props arg))
(define-builtin-markup-command (pad-x layout props amount arg) (number? markup?)
-
- "Add padding @var{amount} around @var{arg} in the X-direction. "
+ "Add padding @var{amount} around @var{arg} in the X@tie{}direction."
(let*
((m (interpret-markup layout props arg))
(x (ly:stencil-extent m X))
(define-builtin-markup-command (put-adjacent layout props arg1 axis dir arg2) (markup? integer? ly:dir? markup?)
-
- "Put @var{arg2} next to @var{arg1}, without moving @var{arg1}. "
-
+ "Put @var{arg2} next to @var{arg1}, without moving @var{arg1}."
(let* ((m1 (interpret-markup layout props arg1))
(m2 (interpret-markup layout props arg2)))
))
(define-builtin-markup-command (transparent layout props arg) (markup?)
- "Make the argument transparent"
+ "Make the argument transparent."
(let*
((m (interpret-markup layout props arg))
(x (ly:stencil-extent m X))
(define-builtin-markup-command (pad-to-box layout props x-ext y-ext arg)
(number-pair? number-pair? markup?)
- "Make @var{arg} take at least @var{x-ext}, @var{y-ext} space"
+ "Make @var{arg} take at least @var{x-ext}, @var{y-ext} space."
(let*
((m (interpret-markup layout props arg))
(define-builtin-markup-command (fromproperty layout props symbol) (symbol?)
"Read the @var{symbol} from property settings, and produce a stencil
- from the markup contained within. If @var{symbol} is not defined, it
- returns an empty markup"
+from the markup contained within. If @var{symbol} is not defined, it
+returns an empty markup."
(let* ((m (chain-assoc-get symbol props)))
(if (markup? m)
(interpret-markup layout props m)
(define-builtin-markup-command (on-the-fly layout props procedure arg) (symbol? markup?)
- "Apply the @var{procedure} markup command to
-@var{arg}. @var{procedure} should take a single argument."
+ "Apply the @var{procedure} markup command to @var{arg}.
+@var{procedure} should take a single argument."
(let* ((anonymous-with-signature (lambda (layout props arg) (procedure layout props arg))))
(set-object-property! anonymous-with-signature
'markup-signature
any sort of property supported by @internalsref{font-interface} and
@internalsref{text-interface}, for example
-@verbatim
+@example
\\override #'(font-family . married) \"bla\"
-@end verbatim
-
-"
+@end example"
(interpret-markup layout (cons (list new-prop) props) arg))
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
(define-builtin-markup-command (verbatim-file layout props name) (string?)
- "Read the contents of a file, and include verbatimly"
+ "Read the contents of a file, and include it verbatim."
(interpret-markup
layout props
(define-builtin-markup-command (bigger layout props arg) (markup?)
- "Increase the font size relative to current setting"
+ "Increase the font size relative to current setting."
(interpret-markup layout props
`(,fontsize-markup 1 ,arg)))
(define-builtin-markup-command (smaller layout props arg) (markup?)
- "Decrease the font size relative to current setting"
+ "Decrease the font size relative to current setting."
(interpret-markup layout props
`(,fontsize-markup -1 ,arg)))
(define-builtin-markup-command (fontsize layout props increment arg) (number? markup?)
- "Add @var{increment} to the font-size. Adjust baseline skip accordingly."
+ "Add @var{increment} to the font-size. Adjust baseline skip accordingly."
(let* ((fs (chain-assoc-get 'font-size props 0))
(bs (chain-assoc-get 'baseline-skip props 2))
(interpret-markup layout (cons entries props) arg)))
(define-builtin-markup-command (magnify layout props sz arg) (number? markup?)
- "Set the font magnification for the its argument. In the following
-example, the middle A will be 10% larger:
+ "Set the font magnification for its argument. In the following
+example, the middle@tie{}A is 10% larger:
+
@example
A \\magnify #1.1 @{ A @} A
@end example
-Note: magnification only works if a font-name is explicitly selected.
+Note: Magnification only works if a font name is explicitly selected.
Use @code{\\fontsize} otherwise."
(interpret-markup
layout
arg))
(define-builtin-markup-command (bold layout props arg) (markup?)
- "Switch to bold font-series"
+ "Switch to bold font-series."
(interpret-markup layout (prepend-alist-chain 'font-series 'bold props) arg))
(define-builtin-markup-command (sans layout props arg) (markup?)
- "Switch to the sans serif family"
+ "Switch to the sans serif family."
(interpret-markup layout (prepend-alist-chain 'font-family 'sans props) arg))
(define-builtin-markup-command (number layout props arg) (markup?)
"Set font family to @code{number}, which yields the font used for
time signatures and fingerings. This font only contains numbers and
-some punctuation. It doesn't have any letters. "
+some punctuation. It doesn't have any letters."
(interpret-markup layout (prepend-alist-chain 'font-encoding 'fetaNumber props) arg))
(define-builtin-markup-command (roman layout props arg) (markup?)
"Turn @code{text}, which should be a string, to small caps.
@example
\\markup \\smallCaps \"Text between double quotes\"
-@end example
-"
+@end example"
(define (make-small-caps-markup chars)
(cond ((null? chars)
(markup))
#f)))
(define-builtin-markup-command (caps layout props arg) (markup?)
+ "Emit @var{arg} as small caps."
(interpret-markup layout props (make-smallCaps-markup arg)))
(define-builtin-markup-command (dynamic layout props arg) (markup?)
"Use the dynamic font. This font only contains @b{s}, @b{f}, @b{m},
-@b{z}, @b{p}, and @b{r}. When producing phrases, like ``pi@`{u} @b{f}'', the
-normal words (like ``pi@`{u}'') should be done in a different font. The
-recommend font for this is bold and italic"
+@b{z}, @b{p}, and @b{r}. When producing phrases, like
+@q{pi@`{u}@tie{}@b{f}}, the normal words (like @q{pi@`{u}}) should be
+done in a different font. The recommended font for this is bold and italic."
(interpret-markup
layout (prepend-alist-chain 'font-encoding 'fetaDynamic props) arg))
(define-builtin-markup-command (italic layout props arg) (markup?)
- "Use italic @code{font-shape} for @var{arg}. "
+ "Use italic @code{font-shape} for @var{arg}."
(interpret-markup layout (prepend-alist-chain 'font-shape 'italic props) arg))
(define-builtin-markup-command (typewriter layout props arg) (markup?)
layout (prepend-alist-chain 'font-shape 'upright props) arg))
(define-builtin-markup-command (medium layout props arg) (markup?)
- "Switch to medium font-series (in contrast to bold)."
+ "Switch to medium font series (in contrast to bold)."
(interpret-markup layout (prepend-alist-chain 'font-series 'medium props)
arg))
(define-builtin-markup-command (normal-text layout props arg) (markup?)
- "Set all font related properties (except the size) to get the default normal text font, no matter what font was used earlier."
+ "Set all font related properties (except the size) to get the default
+normal text font, no matter what font was used earlier."
;; ugh - latin1
(interpret-markup layout
(cons '((font-family . roman) (font-shape . upright)
(interpret-markup layout props (markup #:musicglyph (assoc-get -1 standard-alteration-glyph-name-alist ""))))
(define-builtin-markup-command (with-color layout props color arg) (color? markup?)
- "Draw @var{arg} in color specified by @var{color}"
+ "Draw @var{arg} in color specified by @var{color}."
(let* ((stil (interpret-markup layout props arg)))
(define-builtin-markup-command (arrow-head layout props axis direction filled)
(integer? ly:dir? boolean?)
- "produce an arrow head in specified direction and axis. Use the filled head if @var{filled} is specified."
+ "Produce an arrow head in specified direction and axis.
+Use the filled head if @var{filled} is specified."
(let*
((name (format "arrowheads.~a.~a~a"
(if filled
name)))
(define-builtin-markup-command (musicglyph layout props glyph-name) (string?)
- "This is converted to a musical symbol, e.g. @code{\\musicglyph
-#\"accidentals.natural\"} will select the natural sign from the music font.
-See @usermanref{The Feta font} for a complete listing of the possible glyphs."
+ "@var{glyph0name} is converted to a musical symbol; for example,
+@code{\\musicglyph #\"accidentals.natural\"} selects the natural sign from
+the music font. See @usermanref{The Feta font} for a complete listing of
+the possible glyphs."
(ly:font-get-glyph
(ly:paper-get-font layout (cons '((font-encoding . fetaMusic))
props))
glyph-name))
(define-builtin-markup-command (char layout props num) (integer?)
- "Produce a single character, e.g. @code{\\char #65} produces the
-letter 'A'."
+ "Produce a single character. For example, @code{\\char #65} produces the
+letter @q{A}."
(ly:text-interface::interpret-markup layout props (ly:wide-char->utf-8 num)))
(make-string 1 (vector-ref vec n)))))
(define-builtin-markup-command (markletter layout props num) (integer?)
- "Make a markup letter for @var{num}. The letters start with A to Z
- (skipping I), and continues with double letters."
+ "Make a markup letter for @var{num}. The letters start with A to@tie{}Z
+(skipping letter@tie{}I), and continue with double letters."
(ly:text-interface::interpret-markup layout props
(number->markletter-string number->mark-letter-vector num)))
(define-builtin-markup-command (markalphabet layout props num) (integer?)
- "Make a markup letter for @var{num}. The letters start with A to Z
- and continues with double letters."
+ "Make a markup letter for @var{num}. The letters start with A to@tie{}Z
+and continue with double letters."
(ly:text-interface::interpret-markup layout props
(number->markletter-string number->mark-alphabet-vector num)))
(define-builtin-markup-command (slashed-digit layout props num) (integer?)
- "A feta number, with slash. This is for use in the context of
-figured bass notation"
+ "A feta number, with slash. This is for use in the context of
+figured bass notation."
(let*
((mag (magstep (chain-assoc-get 'font-size props 0)))
(thickness
(define-builtin-markup-command (note layout props duration dir) (string? number?)
"This produces a note with a stem pointing in @var{dir} direction, with
-the @var{duration} for the note head type and augmentation dots. For
+the @var{duration} for the note head type and augmentation dots. For
example, @code{\\note #\"4.\" #-0.75} creates a dotted quarter note, with
a shortened down stem."
(let ((parsed (parse-simple-duration duration)))
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
(define-builtin-markup-command (lower layout props amount arg) (number? markup?)
- "
-Lower @var{arg}, by the distance @var{amount}.
-A negative @var{amount} indicates raising, see also @code{\\raise}.
-"
+ "Lower @var{arg} by the distance @var{amount}.
+A negative @var{amount} indicates raising; see also @code{\\raise}."
(ly:stencil-translate-axis (interpret-markup layout props arg)
(- amount) Y))
(define-builtin-markup-command (translate-scaled layout props offset arg) (number-pair? markup?)
- "Translate @var{arg} by @var{offset}, scaling the offset by the @code{font-size}."
-
+ "Translate @var{arg} by @var{offset}, scaling the offset by the
+@code{font-size}."
(let*
((factor (magstep (chain-assoc-get 'font-size props 0)))
(scaled (cons (* factor (car offset))
scaled)))
(define-builtin-markup-command (raise layout props amount arg) (number? markup?)
- "
-Raise @var{arg}, by the distance @var{amount}.
+ "Raise @var{arg} by the distance @var{amount}.
A negative @var{amount} indicates lowering, see also @code{\\lower}.
@c
@lilypond[verbatim,fragment,relative=1]
- c1^\\markup { C \\small \\raise #1.0 \\bold { \"9/7+\" }}
+c1^\\markup { C \\small \\raise #1.0 \\bold { \"9/7+\" } }
@end lilypond
The argument to @code{\\raise} is the vertical displacement amount,
measured in (global) staff spaces. @code{\\raise} and @code{\\super}
If the text object itself is positioned above or below the staff, then
@code{\\raise} cannot be used to move it, since the mechanism that
positions it next to the staff cancels any shift made with
-@code{\\raise}. For vertical positioning, use the @code{padding}
-and/or @code{extra-offset} properties. "
+@code{\\raise}. For vertical positioning, use the @code{padding}
+and/or @code{extra-offset} properties."
(ly:stencil-translate-axis (interpret-markup layout props arg) amount Y))
(define-builtin-markup-command (fraction layout props arg1 arg2) (markup? markup?)
;; empirical anyway
(ly:stencil-translate-axis stack offset Y))))
-
-
-
-
(define-builtin-markup-command (normal-size-super layout props arg) (markup?)
"Set @var{arg} in superscript with a normal font size."
(ly:stencil-translate-axis
@cindex @code{\\super}
-
Raising and lowering texts can be done with @code{\\super} and
@code{\\sub}:
-
+@c
@lilypond[verbatim,fragment,relative=1]
- c1^\\markup { E \"=\" mc \\super \"2\" }
-@end lilypond
-
-"
+c1^\\markup { E \"=\" \\concat { \"mc\" \\super \"2\" } }
+@end lilypond"
(ly:stencil-translate-axis
(interpret-markup
layout
Y))
(define-builtin-markup-command (translate layout props offset arg) (number-pair? markup?)
- "This translates an object. Its first argument is a cons of numbers
+ "This translates an object. Its first argument is a cons of numbers.
+
@example
A \\translate #(cons 2 -3) @{ B C @} D
@end example
-This moves `B C' 2 spaces to the right, and 3 down, relative to its
-surroundings. This command cannot be used to move isolated scripts
-vertically, for the same reason that @code{\\raise} cannot be used for
-that.
-"
+This moves @q{B C} 2@tie{}spaces to the right, and 3 down, relative to its
+surroundings. This command cannot be used to move isolated scripts
+vertically, for the same reason that @code{\\raise} cannot be used for
+that."
(ly:stencil-translate (interpret-markup layout props arg)
offset))
(m (interpret-markup layout props arg)))
(bracketify-stencil m Y th (* 2.5 th) th)))
\f
-
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
-;; size indications arrow
+;; Delayed markup evaluation
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+(define-builtin-markup-command (page-ref layout props label gauge default)
+ (symbol? markup? markup?)
+ "Reference to a page number. @var{label} is the label set on the referenced
+page (using the @code{\\label} command), @var{gauge} a markup used to estimate
+the maximum width of the page number, and @var{default} the value to display
+when @var{label} is not found."
+ (let* ((gauge-stencil (interpret-markup layout props gauge))
+ (x-ext (ly:stencil-extent gauge-stencil X))
+ (y-ext (ly:stencil-extent gauge-stencil Y)))
+ (ly:make-stencil
+ `(delay-stencil-evaluation
+ ,(delay (ly:stencil-expr
+ (let* ((table (ly:output-def-lookup layout 'label-page-table))
+ (label-page (and (list? table) (assoc label table)))
+ (page-number (and label-page (cdr label-page)))
+ (page-markup (if page-number (format "~a" page-number) default))
+ (page-stencil (interpret-markup layout props page-markup))
+ (gap (- (interval-length x-ext)
+ (interval-length (ly:stencil-extent page-stencil X)))))
+ (interpret-markup layout props
+ (markup #:concat (#:hspace gap page-markup)))))))
+ x-ext
+ y-ext)))