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