new engraver for spacing in chordlyrics

private_includes/base/all.ily

@@ -24,7 +24,6 @@
 #(define AUTHOR_DATA (if (defined? 'AUTHOR_DATA) AUTHOR_DATA (parse-yml-file "../../lilypond-song-includes/data/authors.yml")))
 #(define SONG_DATA (if (defined? 'SONG_DATA) SONG_DATA (parse-yml-file "../../lilypond-song-includes/data/songs.yml")))
 
-\include "merge_rests_engraver_override.ily"
 \include "basic_format_and_style_settings.ily"
 \include "eps_file_from_song_dir.ily"
 \include "title_with_category_images.ily"

private_includes/base/basic_format_and_style_settings.ily

@@ -44,7 +44,7 @@ generalLayout = \layout {
   \context {
     \Staff
     \accidentalStyle modern-voice-cautionary
-    \consists \Better_Merge_rests_engraver
+    \consists Merge_rests_engraver
   }
   \context {
     \Score
@@ -67,7 +67,6 @@ generalLayout = \layout {
     % ich will lines breaken wie ich will!
     \remove "Forbid_line_break_engraver"
     \override NoteHead.layer = 2
-    \override Rest.layer = 2
     \override Dots.layer = 2
     \override Stem.layer = 2
     \override Flag.layer = 2
@@ -84,14 +83,12 @@ textp = \lyricmode { \markup { \raise #1 \musicglyph #"rests.3" } }
 % zweite Stimme alles grau
 secondVoiceStyle = {
   \override NoteHead.color = #grey
-  \override Rest.color = #grey
   \override Dots.color = #grey
   \override Stem.color = #grey
   \override Flag.color = #grey
   \override Beam.color = #grey
   \override Accidental.color = #grey
   \override NoteHead.layer = 1
-  \override Rest.layer = 1
   \override Dots.layer = 1
   \override Stem.layer = 1
   \override Flag.layer = 1
@@ -101,7 +98,6 @@ secondVoiceStyle = {
 
 firstVoiceStyle = {
   \override NoteHead.color = #black
-  \override Rest.color = #black
   \override Dots.color = #black
   \override Stem.color = #black
   \override Flag.color = #black

private_includes/base/merge_rests_engraver_override.ily

@@ -1,86 +0,0 @@
-Better_Merge_rests_engraver =
-#(lambda (context)
-  (define (has-one-or-less? lst) (or (null? lst) (null? (cdr lst))))
-  (define (has-at-least-two? lst) (not (has-one-or-less? lst)))
-  (define (all-equal? lst pred)
-    (or (has-one-or-less? lst)
-        (and (pred (car lst) (cadr lst)) (all-equal? (cdr lst) pred))))
-  (define (measure-count-eqv? a b)
-    (eqv?
-     (ly:grob-property a 'measure-count)
-     (ly:grob-property b 'measure-count)))
-
-  (define (rests-all-unpitched? rests)
-    "Returns true when all rests do not override the staff-position grob
-    property. When a rest has a position set we do not want to merge rests at
-    that position."
-    (every (lambda (rest) (null? (ly:grob-property rest 'staff-position))) rests))
-
-  (define (less-by-layer a b)
-    (<
-      (ly:grob-property b 'layer)
-      (ly:grob-property a 'layer)))
-
-  (define (merge-mmrests mmrests)
-    "Move all multimeasure rests to the single voice location."
-    (if (all-equal? mmrests measure-count-eqv?)
-        (begin
-          (for-each
-           (lambda (rest) (ly:grob-set-property! rest 'direction CENTER))
-           mmrests)
-          (for-each
-           (lambda (rest) (ly:grob-set-property! rest 'transparent #t))
-           (cdr (sort mmrests less-by-layer))))))
-
-  (define (merge-rests rests)
-    (for-each
-     (lambda (rest) (ly:grob-set-property! rest 'staff-position 0))
-     rests)
-    (for-each
-     (lambda (rest) (ly:grob-set-property! rest 'transparent #t))
-     (cdr (sort rests less-by-layer))))
-
-  (let ((mmrests '())
-        (rests '())
-        (dots '()))
-    (make-engraver
-     ((start-translation-timestep translator)
-      (set! rests '())
-      (set! mmrests '())
-      (set! dots '()))
-     (acknowledgers
-      ((dot-column-interface engraver grob source-engraver)
-       (if (not (ly:context-property context 'suspendRestMerging #f))
-           (set!
-            dots
-            (append (ly:grob-array->list (ly:grob-object grob 'dots))
-                    dots))))
-      ((rest-interface engraver grob source-engraver)
-       (cond
-        ((ly:context-property context 'suspendRestMerging #f)
-         #f)
-        ((grob::has-interface grob 'multi-measure-rest-interface)
-         (set! mmrests (cons grob mmrests)))
-        (else
-         (set! rests (cons grob rests))))))
-     ((stop-translation-timestep translator)
-      (let (;; get a list of the rests 'duration-lengths, 'duration-log does
-            ;; not take dots into account
-            (durs
-             (map
-              (lambda (g)
-                (ly:duration->moment
-                 (ly:prob-property
-                  (ly:grob-property g 'cause)
-                  'duration)))
-              rests)))
-        (if (and
-             (has-at-least-two? rests)
-             (all-equal? durs equal?)
-             (rests-all-unpitched? rests))
-            (begin
-              (merge-rests rests)
-              ;; ly:grob-suicide! works nicely for dots, as opposed to rests.
-              (if (pair? dots) (for-each ly:grob-suicide! (cdr dots)))))
-        (if (has-at-least-two? mmrests)
-            (merge-mmrests mmrests)))))))

private_includes/base/verses_with_chords.ily

@@ -253,6 +253,113 @@
                                     (make-pad-right-markup -0.1 (make-tied-lyric-markup text))
                                     text))))
 
+Chord_lyrics_spacing_engraver =
+#(lambda (ctx)
+   (let ((last-note-head #f)
+         (note-head-extended #f)
+         (last-lyric-syllable-width 0)
+         (lyric-width-since-last-chord 0)
+         (notes-on-syllable-count 0)
+         (last-chord-name #f)
+         (remaining-chord-width 0)
+         (last-rest #f)
+         (rest-count 0)
+         (multi-measure-rest-count 0)
+         (stanza-shift 0))
+     (make-engraver
+      (listeners
+       ((multi-measure-rest-event engraver event)
+        (set! multi-measure-rest-count (+ multi-measure-rest-count 1))
+        )
+       ((break-event engraver event)
+        (set! last-note-head #f)
+        (set! note-head-extended #f)
+        (set! last-lyric-syllable-width 0)
+        (set! lyric-width-since-last-chord 0)
+        (set! notes-on-syllable-count 0)
+        (set! last-chord-name #f)
+        (set! remaining-chord-width 0)
+        (set! last-rest #f)
+        (set! rest-count 0)
+        (set! multi-measure-rest-count 0)
+        (set! stanza-shift 0)
+        ))
+      (acknowledgers
+       ((note-head-interface this-engraver grob source-engraver)
+        (if (and (> rest-count 0) (not last-note-head))
+            (let ((rest-spacing-on-line-start 1.2))
+              (ly:grob-set-property! grob 'minimum-X-extent (cons (- rest-spacing-on-line-start) 0))
+              (set! stanza-shift rest-spacing-on-line-start)
+              ))
+        (set! notes-on-syllable-count (+ 1 notes-on-syllable-count))
+        (set! last-note-head grob)
+        (set! note-head-extended #f)
+        (set! last-rest #f)
+        (set! rest-count 0)
+        (set! multi-measure-rest-count 0)
+        )
+       ((lyric-syllable-interface this-engraver grob source-engraver)
+        (set! remaining-chord-width (max 0 (- remaining-chord-width lyric-width-since-last-chord)))
+        (set! last-lyric-syllable-width (- (cdr (ly:grob-extent grob grob X)) 0.2))
+        (set! lyric-width-since-last-chord (+ lyric-width-since-last-chord last-lyric-syllable-width))
+        (if last-note-head (set! notes-on-syllable-count 1))
+        )
+       ((chord-name-interface this-engraver grob source-engraver)
+        (if (not (and
+                  (boolean? (ly:grob-property grob 'begin-of-line-visible))
+                  (ly:grob-property grob 'begin-of-line-visible)))
+            (let ((on-a-rest (> rest-count 0)))
+              (if (not on-a-rest)
+                  (set! notes-on-syllable-count (- notes-on-syllable-count 1)))
+              (if (and last-chord-name (= multi-measure-rest-count 1) (> lyric-width-since-last-chord remaining-chord-width))
+                  (ly:grob-set-property! last-chord-name 'extra-spacing-width (cons -0.1 (+ 0.1 (- lyric-width-since-last-chord remaining-chord-width)))))
+              (if last-note-head
+                  (let* ((last-note-min-x-extent (ly:grob-property last-note-head 'minimum-X-extent))
+                         (last-note-min-x-lower (if (pair? last-note-min-x-extent) (car last-note-min-x-extent) 0))
+                         (last-note-min-x-upper (if (pair? last-note-min-x-extent) (cdr last-note-min-x-extent) 0)))
+                    (if on-a-rest
+                        (begin
+                         (if (not note-head-extended)
+                             (begin
+                              (ly:grob-set-property! last-note-head 'minimum-X-extent
+                                                     (cons last-note-min-x-lower (- last-lyric-syllable-width -2 (* 2.2 rest-count))))
+                              (set! note-head-extended #t)
+                              ))
+                         (ly:grob-set-property! last-rest 'minimum-X-extent (cons 0 2))
+                         )
+                        (if (and (> lyric-width-since-last-chord 0)
+                                 (> remaining-chord-width lyric-width-since-last-chord))
+                            (ly:grob-set-property! last-note-head 'minimum-X-extent
+                                                   (cons (- -1.2 (- remaining-chord-width lyric-width-since-last-chord)) last-note-min-x-upper))
+                            (let* ((width-per-note-head 0.5)
+                                   (note-width-since-last-chord (* width-per-note-head notes-on-syllable-count)))
+                              (if (> remaining-chord-width note-width-since-last-chord)
+                                  (ly:grob-set-property! last-note-head 'minimum-X-extent
+                                                         (cons (- note-width-since-last-chord remaining-chord-width) last-note-min-x-upper))
+                                  )
+                              )
+                            )
+                        )))
+              (set! last-chord-name grob)
+              (set! remaining-chord-width
+                    (if (and on-a-rest (equal? (ly:prob-property (ly:grob-property grob 'cause) 'duration) (ly:prob-property (ly:grob-property last-rest 'cause) 'duration)))
+                        0
+                        (cdr (ly:grob-extent grob grob X))))
+              (set! lyric-width-since-last-chord 0)
+              (set! notes-on-syllable-count (if on-a-rest 0 1))
+              ))
+        )
+       ((rest-interface this-engraver grob source-engraver)
+        (set! rest-count (+ 1 rest-count))
+        (set! last-rest grob)
+        (set! multi-measure-rest-count 0)
+        )
+       ((stanza-number-interface this-engraver grob source-engraver)
+        (ly:grob-set-property! grob 'padding (+ 1 stanza-shift)))
+       ))))
+
+%#(ly:set-option 'debug-skylines #t)
+
 #(define-markup-command (chordlyrics layout props lyrics) (ly:music?)
    #:properties ((verse-chords #{#})
                  (verse-reference-voice #{#})
@@ -299,6 +406,8 @@
              % \override SpacingSpanner.strict-note-spacing = ##t
               \override SpacingSpanner.uniform-stretching = ##t
               \override SpacingSpanner.spacing-increment = 0
+              %\override SpacingSpanner.packed-spacing = ##t
+              \consists \Chord_lyrics_spacing_engraver
               \remove Bar_number_engraver
               \remove Mark_engraver
               \remove Jump_engraver
@@ -332,9 +441,10 @@
               \NullVoice
               \consists Rest_engraver
               \omit Rest
+              \override Rest.X-extent = #'(0 . 0)
               \undo \omit NoteHead
               \hide NoteHead
-              \override NoteHead.X-extent = #'(0 . 0)
+              \override NoteHead.X-extent = #'(0 . 0.5)
             }
           }
         }