new engraver for spacing in chordlyrics

basic_format_and_style_settings.ly

@@ -121,18 +121,16 @@ override-stanza =
 #}
 )
 
-#(define (stanza . stanzanumbers)
+stanza =
+#(define-music-function (parser location stanzanumber) (number?)
 #{
   \once \override StanzaNumber.layer = 23 % set this to signal that there is a real stanza and no repeat signs
   \applyContext
   #(lambda (context)
-    (let* ((stanzanumber-override (ly:assoc-get 'forced-spacing (ly:context-grob-definition context 'StanzaNumber) #f))
+    (let* ((stanzanumber (ly:assoc-get 'forced-spacing (ly:context-grob-definition context 'StanzaNumber) stanzanumber))
-           (stanza-style (ly:assoc-get 'style (ly:context-grob-definition context 'StanzaNumber)))
+           (stanzastyle (ly:assoc-get 'style (ly:context-grob-definition context 'StanzaNumber)))
-           (stanza-format (lambda (stanzanumber) (format #f (if (eq? stanza-style 'roman) romanStanzaFormat stanzaFormat) stanzanumber))))
+           (formattedStanzaNumber (format #f (if (eq? stanzastyle 'roman) romanStanzaFormat stanzaFormat) stanzanumber)))
-        (ly:context-set-property! context 'stanza
+        (ly:context-set-property! context 'stanza formattedStanzaNumber)))
-          (string-join (map stanza-format
-                            (if stanzanumber-override (list stanzanumber-override) stanzanumbers))
-                        ", "))))
 #}
 )
 
@@ -194,16 +192,12 @@ alt =
 
 updown =
 #(define-music-function (parser location word) (string?)
-(let ((first-char (string-take word 1))
-      (rest (substring word 1 (string-length word))))
 #{
   \lyricmode {
-    \markup {
+    \tag #'up { \markup { #(string-capitalize word) } }
-      \tag #'up #(string-append (string-capitalize first-char) rest)
+    \tag #'down { \markup { #(string-downcase word) } }
-      \tag #'down #(string-append (string-downcase first-char) rest)
-    }
   }
-#}))
+#})
 
 dottedExtender = {
   \override LyricExtender.style = #'dotted-line
@@ -237,19 +231,3 @@ cue =
             (make-null-markup))
       }
   #})
-
-#(define-markup-command (ruf-style layout props text) (string?)
-   (interpret-markup layout props
-                     (markup #:italic (string-append "(" text ")"))))
-rufWithMarkup =
-#(define-music-function (text) (markup?)
-   #{
-     \lyricmode {
-       \once \override StanzaNumber.font-series = #'normal
-       \once \override StanzaNumber.direction = 1
-       \set stanza = #text
-     }
-   #})
-ruf =
-#(define-music-function (text) (string?)
-   (rufWithMarkup (make-ruf-style-markup text)))

verses_with_chords.ly

@@ -434,7 +434,6 @@ Chord_lyrics_spacing_engraver =
               \remove Tie_engraver
               \remove Dynamic_engraver
               \remove Note_heads_engraver
-              \remove Script_engraver
             }
             \context {
               \NullVoice