new engraver for spacing in chordlyrics

private_includes/base/verses_with_chords.ily

@@ -60,19 +60,19 @@
 
 % Text über Text mittig darstellen
 #(define-markup-command (textup layout props text uptext) (markup? markup?)
+   #:properties ((verselayout generalLayout))
    "Markup über Text mittig darstellen."
-   (let ((verselayout (chain-assoc-get 'verselayout props generalLayout)))
    (interpret-markup layout props
      #{\markup {
        \size-box-to-box-style-dependent ##t ##f
          \general-align #X #LEFT \override #`(direction . ,UP) \override #'(baseline-skip . 1.0) \dir-column \chord-alignment-style-dependent {
            \pad-to-box #'(0 . 0) #'(0 . 2.0) { #text }
-           \size-box-to-box ##f ##t #uptext \score { \chords { g4:m a } \layout { \verselayout } }
+           \size-box-to-box ##f ##t #uptext \score { \chords { g4:m a } \layout { $verselayout } }
          }
          #text
        }
      #}
-   )))
+   ))
 
 #(define-markup-command (anchor-x-between layout props arga argb)
    (markup? markup?)
@@ -82,16 +82,15 @@
             (ly:stencil-aligned-to m X (- (/ (* la 2) l) 1))
      ))
 
-#(define-markup-command (stanza-raw layout props arg)
-   (string-or-music?)
-   (let ((verselayout (chain-assoc-get 'verselayout props generalLayout)))
+#(define-markup-command (stanza-raw layout props arg) (string-or-music?)
+   #:properties ((verselayout generalLayout))
    (interpret-markup layout props
      (if (and (string? arg) (string-null? arg))
          " "
          #{\markup
-           \score { \new Lyrics { \lyricmode { #(if (ly:music? arg) arg #{ \set stanza = #arg #}) "" } } \layout { \verselayout } }
+           \score { \new Lyrics { \lyricmode { #(if (ly:music? arg) arg #{ \set stanza = #arg #}) "" } } \layout { $verselayout } }
          #}
-     ))))
+     )))
 
 #(define-markup-command (stanza layout props arg)
    (string-or-music?)
@@ -141,7 +140,7 @@
        (make-wrap-newline-markup
                (ly:regex-replace (ly:make-regex "\\(( *)([^,()]*)( *),([^)]*)\\)")
                  (ly:regex-replace (ly:make-regex "(([^ \n]*\\([^()]*,[^()]+\\)[^ \n(]*)+)") (handle-custom-newlines custom-verse-breaks verse) " \\concat { " 1 " } ")
-                "\\textup \\line { \"" 1 "\" " 2 " \"" 3 "\" } \\score { " transp " \\chords { s4 " 4 " } \\layout { \\verselayout } }")
+                "\\textup \\line { \"" 1 "\" " 2 " \"" 3 "\" } \\score { " transp " \\chords { s4 " 4 " } \\layout { $verselayout } }")
                 )
      ))))
 
@@ -253,6 +252,99 @@
                                     (make-pad-right-markup -0.1 (make-tied-lyric-markup text))
                                     text))))
 
+Chord_lyrics_spacing_engraver =
+#(lambda (ctx)
+   (let ((last-lyric-syllable #f)
+         (lyric-width-since-last-chord 0)
+         (music-columns-for-last-syllable 0)
+         (last-printed-chord #f)
+         (chord-width-since-last-lyric 0)
+         (lyrics-seen-since-break #f)
+         (have-a-rest #f)
+         (stanza #f)
+         (place-at-right-edge
+          (lambda (grob anchor padding)
+            (let ((anchor-width (interval-length (ly:grob-extent anchor anchor X))))
+              (ly:grob-set-parent! grob X anchor)
+              (ly:grob-set-property! grob 'X-offset (+ padding anchor-width))
+              ))))
+     (make-engraver
+      (listeners
+       ((multi-measure-rest-event engraver event)
+        (set! have-a-rest #t)
+        )
+       ((rest-event engraver event)
+        (set! have-a-rest #t)
+        )
+       ((lyric-event engraver event)
+        (set! have-a-rest #f)
+        (set! music-columns-for-last-syllable 0)
+        )
+       ((break-event engraver event)
+        (set! last-lyric-syllable #f)
+        (set! lyric-width-since-last-chord 0)
+        (set! music-columns-for-last-syllable 0)
+        (set! last-printed-chord #f)
+        (set! chord-width-since-last-lyric 0)
+        (set! lyrics-seen-since-break #f)
+        ))
+      (acknowledgers
+       ((musical-paper-column-interface this-engraver grob source-engraver)
+        (set! music-columns-for-last-syllable (+ 1 music-columns-for-last-syllable))
+        )
+       ((lyric-syllable-interface this-engraver grob source-engraver)
+        (let ((syllable-width (interval-length (ly:grob-extent grob grob X))))
+          (set! lyric-width-since-last-chord (+ lyric-width-since-last-chord syllable-width))
+          )
+        (if (> chord-width-since-last-lyric 0)
+            (if lyrics-seen-since-break
+                (ly:grob-set-property! grob 'extra-spacing-width
+                                       (cons (- chord-width-since-last-lyric) (cdr (ly:grob-property grob 'extra-spacing-width '(0 . 0)))))
+                (if last-printed-chord
+                  (begin
+                    (if stanza (ly:grob-set-property! stanza 'padding chord-width-since-last-lyric))
+                    (place-at-right-edge grob last-printed-chord 0)
+                    )))
+            )
+        (set! last-lyric-syllable grob)
+        (set! chord-width-since-last-lyric 0)
+        (set! lyrics-seen-since-break #t)
+        )
+       ((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)
+                  lyrics-seen-since-break))
+            (let* ((last-printed-chord-width (if last-printed-chord (interval-length (ly:grob-extent last-printed-chord last-printed-chord X)) 0))
+                   (chord-overwidth (- last-printed-chord-width lyric-width-since-last-chord))
+                   (chord-gap 0.5))
+              (if have-a-rest
+                  (let ((chord-width (interval-length (ly:grob-extent grob grob X))))
+                    (if last-lyric-syllable
+                        (if (and last-printed-chord (> chord-overwidth 0))
+                          (place-at-right-edge grob last-printed-chord chord-gap)
+                          (place-at-right-edge grob last-lyric-syllable 0))
+                        (if last-printed-chord
+                            (place-at-right-edge grob last-printed-chord chord-gap)))
+                    (set! chord-width-since-last-lyric (+ chord-width-since-last-lyric chord-width chord-gap))
+                    ))
+              (if (and last-lyric-syllable last-printed-chord (> chord-overwidth 0))
+                      (ly:grob-set-property! last-lyric-syllable 'extra-spacing-width
+                                             (cons (car (ly:grob-property last-lyric-syllable 'extra-spacing-width '(0 . 0))) (+ chord-gap chord-overwidth)))
+                      )
+              (set! lyric-width-since-last-chord (* (if last-lyric-syllable (interval-length (ly:grob-extent last-lyric-syllable last-lyric-syllable X)) 0) (- 1 (/ 1.0 music-columns-for-last-syllable))))
+              (set! last-printed-chord grob)
+              (set! last-lyric-syllable #f)
+              )
+            (ly:grob-set-property! grob 'X-extent '(+inf.0 . -inf.0))
+            )
+        )
+        ((stanza-number-interface this-engraver grob source-engraver)
+          (set! stanza grob)
+          )
+       )
+      )))
+
 #(define-markup-command (chordlyrics layout props lyrics) (ly:music?)
    #:properties ((verse-chords #{#})
                  (verse-reference-voice #{#})
@@ -272,10 +364,7 @@
             \new Lyrics \lyricsto "dummyvoice" { #lyrics }
           >>
           \layout {
-            \verselayout
-            #(let
-              ((custom-size (ly:output-def-lookup verselayout 'size #f)))
-              (if custom-size (layout-set-staff-size custom-size)))
+            $verselayout
             ragged-right = ##t
             \context {
               \Lyrics
@@ -296,9 +385,11 @@
             \context {
               \Score
               \override PaperColumn.keep-inside-line = ##f
-             % \override SpacingSpanner.strict-note-spacing = ##t
+              % \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
@@ -328,14 +419,6 @@
               \remove Note_heads_engraver
               \remove Script_engraver
             }
-            \context {
-              \NullVoice
-              \consists Rest_engraver
-              \omit Rest
-              \undo \omit NoteHead
-              \hide NoteHead
-              \override NoteHead.X-extent = #'(0 . 0)
-            }
           }
         }
       }

public_includes/layout_bottom.ily

@@ -1,5 +1,12 @@
 MUSIC = { \transposable #TRANSPOSITION \MUSIC }
 
+LAYOUT = \layout {
+  \LAYOUT
+  #(let
+    ((custom-size (ly:output-def-lookup LAYOUT 'size #f)))
+    (if custom-size (layout-set-staff-size custom-size)))
+}
+
 verselayout = \layout {
   \LAYOUT
   \context {
@@ -8,13 +15,6 @@ verselayout = \layout {
   }
 }
 
-LAYOUT = \layout {
-  \LAYOUT
-  #(let
-    ((custom-size (ly:output-def-lookup LAYOUT 'size #f)))
-    (if custom-size (layout-set-staff-size custom-size)))
-}
-
 TEXT = \markuplist {
   \override #`(transposition . ,TRANSPOSITION)
   \override #`(verselayout . ,verselayout)