135 lines
6.6 KiB
Plaintext
135 lines
6.6 KiB
Plaintext
% https://lsr.di.unimi.it/LSR/Snippet?id=1098
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%%%%%%%% HEADER %%%%%%%%
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%
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% this code was prompted by
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% https://lists.gnu.org/archive/html/lilypond-user/2019-07/msg00139.html
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% and offers a pseudoIndent hack suitable for general use
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% keywords:
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% indent short-indent indentation system line
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% mid-score temporarily arbitrary individual single just only once
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% coda margin
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% mouse's tale acrostic mesostic spine
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%%%%%%%% PSEUDOINDENT FUNCTIONS %%%%%%%%
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% these two functions are for indenting individual systems
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% - to left-indent a system, apply \pseudoIndent before the music continues
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% - \pseudoIndents is similar, but lets you also indent on the right
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% - both provide an option for changing that system's instrument names
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% N.B. these functions
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% - assume application to non-ragged lines (generally the default)
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% - include a manual \break to ensure application at line start
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% - misbehave if called more than once at the same line start
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% the parameters of the (full) pseudoIndents function are:
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% 1: name-tweaks
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% usually omitted; accepts replacement \markup for instrument names
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% as an ordered list; starred elements leave their i-names unchanged.
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% 2: left-indent
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% additional left-indentation, in staff-space units; can be negative,
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% but avoid a total indentation which implies (unsupported) stretching.
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% 3: right-indent
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% amount of right-indentation, in staff-space units; can be negative.
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% - not offered by the (reduced) pseudoIndent function
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pseudoIndents = % inline alternative to a new \score, also with right-indent
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#(define-music-function (name-tweaks left-indent right-indent)
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((markup-list? '()) number? number?)
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(define (warn-stretched p1 p2) (ly:input-warning (*location*) (G_
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" pseudoIndents ~s ~s is stretching staff; expect distorted layout") p1 p2))
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(let* (
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(narrowing (+ left-indent right-indent)) ; of staff implied by args
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(set-staffsymbol! (lambda (staffsymbol-grob) ; change staff to new width
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(let* (
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(left-bound (ly:spanner-bound staffsymbol-grob LEFT))
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(left-moment (ly:grob-property left-bound 'when))
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(capo? (moment<=? left-moment ZERO-MOMENT)) ; in first system of score
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(layout (ly:grob-layout staffsymbol-grob))
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(lw (ly:output-def-lookup layout 'line-width)) ; debugging info
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(indent (ly:output-def-lookup layout (if capo? 'indent 'short-indent)))
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(old-stil (ly:staff-symbol::print staffsymbol-grob))
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(staffsymbol-x-ext (ly:stencil-extent old-stil X))
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;; >=2.19.16's first system has old-stil already narrowed [2]
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;; compensate for this (ie being not pristine) when calculating
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;; - old leftmost-x (its value is needed when setting so-called 'width)
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;; - the new width and position (via local variable narrowing_)
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(ss-t (ly:staff-symbol-line-thickness staffsymbol-grob))
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(pristine? (<= 0 (car staffsymbol-x-ext) ss-t)) ; would expect half
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(leftmost-x (+ indent (if pristine? 0 narrowing)))
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(narrowing_ (if pristine? narrowing 0)) ; uses 0 if already narrowed
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(old-width (+ (interval-length staffsymbol-x-ext) ss-t))
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(new-width (- old-width narrowing_))
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(new-rightmost-x (+ leftmost-x new-width)) ; and set! this immediately
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(junk (ly:grob-set-property! staffsymbol-grob 'width new-rightmost-x))
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(in-situ-stil (ly:staff-symbol::print staffsymbol-grob))
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(new-stil (ly:stencil-translate-axis in-situ-stil narrowing_ X))
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;(new-stil (stencil-with-color new-stil red)) ; for when debugging
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(new-x-ext (ly:stencil-extent new-stil X)))
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(ly:grob-set-property! staffsymbol-grob 'stencil new-stil)
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(ly:grob-set-property! staffsymbol-grob 'X-extent new-x-ext)
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)))
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(set-X-offset! (lambda (margin-grob) ; move grob across to line start
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(let* (
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(old (ly:grob-property-data margin-grob 'X-offset))
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(new (lambda (grob) (+ (if (procedure? old) (old grob) old) narrowing))))
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(ly:grob-set-property! margin-grob 'X-offset new))))
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(tweak-text! (lambda (i-name-grob mkup) ; tweak both instrumentname texts
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(if (and (markup? mkup) (not (string=? (markup->string mkup) "*")))
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(begin
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(ly:grob-set-property! i-name-grob 'long-text mkup)
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(ly:grob-set-property! i-name-grob 'text mkup)
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)))) ; else retain existing text
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(install-narrowing (lambda (leftedge-grob) ; on staves, + adapt left margin
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(let* (
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(sys (ly:grob-system leftedge-grob))
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(all-grobs (ly:grob-array->list (ly:grob-object sys 'all-elements)))
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(grobs-named (lambda (name)
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(filter (lambda (x) (eq? name (grob::name x))) all-grobs)))
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(first-leftedge-grob (list-ref (grobs-named 'LeftEdge) 0))
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(relsys-x-of (lambda (g) (ly:grob-relative-coordinate g sys X)))
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(leftedge-x (relsys-x-of first-leftedge-grob))
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(leftedged? (lambda (g) (= (relsys-x-of g) leftedge-x)))
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(leftedged-ss (filter leftedged? (grobs-named 'StaffSymbol))))
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(if (eq? leftedge-grob first-leftedge-grob) ; ignore other leftedges [1]
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(begin
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(for-each set-staffsymbol! leftedged-ss)
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(for-each set-X-offset! (grobs-named 'SystemStartBar))
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(for-each set-X-offset! (grobs-named 'InstrumentName))
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(for-each tweak-text! (grobs-named 'InstrumentName) name-tweaks)
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))))))
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(if (negative? narrowing) (warn-stretched left-indent right-indent))
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#{ % and continue anyway
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% ensure that these overrides are applied only at begin-of-line
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\break % (but this does not exclude unsupported multiple application)
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% give the spacing engine notice regarding the loss of width for music
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\once \override Score.LeftEdge.X-extent = #(cons narrowing narrowing)
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% discard line start region of staff and reassemble left-margin elements
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\once \override Score.LeftEdge.after-line-breaking = #install-narrowing
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% shift the system to partition the narrowing between left and right
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\overrideProperty Score.NonMusicalPaperColumn.line-break-system-details
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.X-offset #(- right-indent)
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% prevent a leftmost barnumber entering a stretched staff
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\once \override Score.BarNumber.horizon-padding = #(max 1 (- 1 narrowing))
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#}))
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pseudoIndent = % for changing just left-indent
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#(define-music-function (name-tweaks left-indent)
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((markup-list? '()) number?)
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#{
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\pseudoIndents $name-tweaks $left-indent 0
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#})
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% [1] versions <2.19.1 can have end-of-line leftedges too
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% - these were eliminated in issue 3761
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% [2] versions >=2.19.16: the first system behaves differently from the rest
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% - a side effect of issue 660 ?
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% [3] versions >=2.23.0: LeftEdge's position may well differ in Y (but not in X)
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% - a side effect of issue 6084 ? |