+ (let*
+ ((arg-stencils (map (lambda (m) (interpret-markup layout props m)) args))
+ (skip (chain-assoc-get 'baseline-skip props)))
+
+
+ (stack-lines
+ -1 0.0 skip
+ (remove ly:stencil-empty? arg-stencils))))
+
+
+(define-markup-command (dir-column layout props args) (markup-list?)
+ "Make a column of args, going up or down, depending on the setting
+of the @code{#'direction} layout property."
+ (let* ((dir (chain-assoc-get 'direction props)))
+ (stack-lines
+ (if (number? dir) dir -1)
+ 0.0
+ (chain-assoc-get 'baseline-skip props)
+ (map (lambda (x) (interpret-markup layout props x)) args))))
+
+(define-markup-command (center-align layout props args) (markup-list?)
+ "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-markup-command (vcenter layout props arg) (markup?)
+ "Align @code{arg} to its Y center. "
+ (let* ((mol (interpret-markup layout props arg)))
+ (ly:stencil-aligned-to mol Y CENTER)))
+
+(define-markup-command (hcenter layout props arg) (markup?)
+ "Align @code{arg} to its X center. "
+ (let* ((mol (interpret-markup layout props arg)))
+ (ly:stencil-aligned-to mol X CENTER)))
+
+(define-markup-command (right-align layout props arg) (markup?)
+ "Align @var{arg} on its right edge. "
+ (let* ((m (interpret-markup layout props arg)))
+ (ly:stencil-aligned-to m X RIGHT)))
+
+(define-markup-command (left-align layout props arg) (markup?)
+ "Align @var{arg} on its left edge. "
+ (let* ((m (interpret-markup layout props arg)))
+ (ly:stencil-aligned-to m X LEFT)))
+
+(define-markup-command (general-align layout props axis dir arg) (integer? number? markup?)
+ "Align @var{arg} in @var{axis} direction to the @var{dir} side."
+ (let* ((m (interpret-markup layout props arg)))
+ (ly:stencil-aligned-to m axis dir)))
+
+(define-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
+alignment accordingly."
+ (let* ((m (interpret-markup layout props arg)))
+ (ly:stencil-aligned-to m X dir)))
+
+
+
+(define-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}."
+
+ (let* ((m (interpret-markup layout props arg)))
+ (ly:make-stencil (ly:stencil-expr m) x y)))
+
+
+(define-markup-command (pad-around layout props amount arg) (number? markup?)
+
+ "Add padding @var{amount} all around @var{arg}. "
+
+ (let*
+ ((m (interpret-markup layout props arg))
+ (x (ly:stencil-extent m X))
+ (y (ly:stencil-extent m Y)))
+
+
+ (ly:make-stencil (ly:stencil-expr m)
+ (interval-widen x amount)
+ (interval-widen y amount))
+ ))
+
+
+(define-markup-command (pad-x layout props amount arg) (number? markup?)
+
+ "Add padding @var{amount} around @var{arg} in the X-direction. "
+ (let*
+ ((m (interpret-markup layout props arg))
+ (x (ly:stencil-extent m X))
+ (y (ly:stencil-extent m Y)))
+
+
+ (ly:make-stencil (ly:stencil-expr m)
+ (interval-widen x amount)
+ y)
+ ))
+
+
+(define-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}. "
+
+ (let* ((m1 (interpret-markup layout props arg1))
+ (m2 (interpret-markup layout props arg2)))
+
+ (ly:stencil-combine-at-edge m1 axis dir m2 0.0 0.0)
+ ))
+
+(define-markup-command (transparent layout props arg) (markup?)
+ "Make the argument transparent"
+ (let*
+ ((m (interpret-markup layout props arg))
+ (x (ly:stencil-extent m X))
+ (y (ly:stencil-extent m Y)))
+
+
+
+ (ly:make-stencil ""
+ x y)))
+
+
+(define-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"
+
+ (let*
+ ((m (interpret-markup layout props arg))
+ (x (ly:stencil-extent m X))
+ (y (ly:stencil-extent m Y)))
+
+ (ly:make-stencil (ly:stencil-expr m)
+ (interval-union x-ext x)
+ (interval-union y-ext y))))
+
+
+(define-markup-command (hcenter-in layout props length arg)
+ (number? markup?)
+ "Center @var{arg} horizontally within a box of extending
+@var{length}/2 to the left and right."
+
+ (interpret-markup layout props
+ (make-pad-to-box-markup
+ (cons (/ length -2) (/ length 2))
+ '(0 . 0)
+ (make-hcenter-markup arg))))
+
+
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+;; property
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+
+(define-markup-command (fromproperty layout props symbol) (symbol?)