+(define-markup-command (parenthesize layout props arg)
+ (markup?)
+ #:category graphic
+ #:properties ((angularity 0)
+ (padding)
+ (size 1)
+ (thickness 1)
+ (width 0.25))
+ "
+@cindex placing parentheses around text
+
+Draw parentheses around @var{arg}. This is useful for parenthesizing
+a column containing several lines of text.
+
+@lilypond[verbatim,quote]
+\\markup {
+ \\line {
+ \\parenthesize {
+ \\column {
+ foo
+ bar
+ }
+ }
+ \\override #'(angularity . 2) {
+ \\parenthesize {
+ \\column {
+ bah
+ baz
+ }
+ }
+ }
+ }
+}
+@end lilypond"
+ (let* ((markup (interpret-markup layout props arg))
+ (scaled-width (* size width))
+ (scaled-thickness
+ (* (chain-assoc-get 'line-thickness props 0.1)
+ thickness))
+ (half-thickness
+ (min (* size 0.5 scaled-thickness)
+ (* (/ 4 3.0) scaled-width)))
+ (padding (chain-assoc-get 'padding props half-thickness)))
+ (parenthesize-stencil
+ markup half-thickness scaled-width angularity padding)))
+
+\f