% =================================================	%
% 	Musical Functions								%
% =================================================	%
% Part of lilydrum

eighthBeaming = {
	\set baseMoment = #(ly:make-moment 1/8)
	\set beatStructure = #'( 2 2 2 2)
}
eighthReelBeaming = {
	\set baseMoment = #(ly:make-moment 1/8)
	\set beatStructure = #'( 4 4 4 4)
}
eighthCompoundBeaming = {
	\set baseMoment = #(ly:make-moment 1/8)
	\set beatStructure = #'( 3 3 3 3)
}

sixteenthBeaming = {
	\set baseMoment = #(ly:make-moment 1/16)
	\set beatStructure = #'( 4 4 4 4)
}
sixteenthReelBeaming = {
	\set baseMoment = #(ly:make-moment 1/16)
	\set beatStructure = #'( 8 8 8 8)
}
sixteenthCompoundBeaming = {
	\set baseMoment = #(ly:make-moment 1/16)
	\set beatStructure = #'( 6 6 6 6)
}
% triplet
triplet = #(define-music-function (parser location music) (ly:music?) #{ \tuplet 3/2 { $music } #})

% dynamics
v = #(define-event-function (parser location) () #{ \upbow #})


#(define (text-spanner-start-stop mus)
	(let ((elts (ly:music-property mus 'elements)))
	(make-music 'SequentialMusic 'elements
		(append
			(list (make-music 'TextSpanEvent 'span-direction -1))
			(reverse (cdr (reverse elts)))
			(list (make-music 'TextSpanEvent 'span-direction 1))
			(list (last elts))
		)
	)
	)
)

% dynamics with extended lines
dynLine = #(define-music-function
	(parser location text)
	(markup?)
	#{
		\once \override TextSpanner.style = #'line
		\once \override TextSpanner.bound-details.left.text = \markup {
			\combine
				\draw-line #'(0 . -1)
				\draw-line #'(1 . 0)
			\dynamic #text
		}
		\once \override TextSpanner.bound-details.right.text = \markup { \draw-line #'(0 . -1) }
	#})

% unison brackets
% TODO: a little 'u'
% TODO: open ended brackets(\odr,\ofr)
%unisonbracket = {
%		\once \override TextSpanner.style = #'line
%		\once \override TextSpanner #'to-barline = ##t
%		\once \override TextSpanner.bound-details.left.text = \markup {
%			\combine
%				\combine
%					\draw-line #'(0 . -1)
%					\draw-line #'(1 . 0)
%				\translate #'(1 . -0.5 ) \whiteout \box "u"
%		}
%		\once \override TextSpanner.bound-details.right.text = \markup { \draw-line #'(0 . -1) }
%		\once \override TextSpanner.bound-details.right.attach-dir = #RIGHT
%}
%dr = { \unisonbracket	<>\="unison"\startTextSpan }
%fr = { <>\="unison"\stopTextSpan }
%odr = { \unisonbracket	<>\="unison"\startTextSpan }
%ofr = { <>\="unison"\stopTextSpan }
dr = #(define-event-function (parser location) () #{ -\tag #'tutti \startGroup #})
fr = #(define-event-function (parser location) () #{ -\tag #'tutti \stopGroup #})
odr = #(define-event-function (parser location) () #{ -\tag #'tutti \startGroup #})
ofr = #(define-event-function (parser location) () #{ -\tag #'tutti \stopGroup #})

#(define (allbutlastnote mus)
	(let ((elts (ly:music-property mus 'elements)))
		(make-music 'SequentialMusic 'elements (reverse (cdr (reverse elts))))
	)
)
#(define (lastnote mus)
	(let ((elts (ly:music-property mus 'elements)))
		(make-music 'SequentialMusic 'elements (list (last elts)))
	)
)
% TODO: check whether on one note
tutti = #(define-music-function (music) (ly:music?)
	#{
		\override HorizontalBracket.connect-to-neighbor = #'(#t #t)
		<>\dr
		#(allbutlastnote music)
		<>\fr
		#(lastnote music)
		\revert HorizontalBracket.connect-to-neighbor
	#})