Make it possible to override a stanza number

all_base_includes.ly

@@ -1,7 +1,8 @@
 #(define noStandaloneOutput (if (defined? 'noStandaloneOutput) noStandaloneOutput #f))
 
-#(if (defined? 'LAYOUT) #f (load "json_parser.scm"))
+#(if (defined? 'LAYOUT) #f (load (string-append (dirname (current-filename)) file-name-separator-string "json_parser.scm")))
 #(use-modules (json parser))
+\include "resolve_inherits.ly"
 \include "basic_format_and_style_settings.ly"
 \include "eps_file_from_song_dir.ly"
 \include "title_with_category_images.ly"

basic_format_and_style_settings.ly

@@ -105,13 +105,21 @@ romanStanza =
   #(define-music-function (parser location) ()
   #{ \override StanzaNumber.style = #'roman #})
 
+override-stanza =
+#(define-music-function (parser location stanzanumber) (number?)
+#{
+  \once \override StanzaNumber.forced-spacing = #stanzanumber % misuse property "forced-spacing" to override the stanzanumber
+#}
+)
+
 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* ((stanzastyle (ly:assoc-get 'style (ly:context-grob-definition context 'StanzaNumber)))
+    (let* ((stanzanumber (ly:assoc-get 'forced-spacing (ly:context-grob-definition context 'StanzaNumber) stanzanumber))
+           (stanzastyle (ly:assoc-get 'style (ly:context-grob-definition context 'StanzaNumber)))
            (formattedStanzaNumber (format #f (if (eq? stanzastyle 'roman) romanStanzaFormat stanzaFormat) stanzanumber)))
         (ly:context-set-property! context 'stanza formattedStanzaNumber)))
 #}
@@ -148,3 +156,22 @@ repStopWithTag = \lyricmode {
     \set stanza = \markup { \repStop }
   }
 }
+
+rightHyphen = \lyricmode {
+  \once \override StanzaNumber.font-series = #'normal
+  \once \override StanzaNumber.direction = 1
+  \set stanza = "-"
+}
+
+leftHyphen = \lyricmode {
+  \once \override StanzaNumber.font-series = #'normal
+  \set stanza = "-"
+}
+
+multiVerseSkips =
+#(define-music-function (parser location skips) (number?)
+  #{ \tag #'multiVerse { \repeat unfold #skips { \skip4 } } #})
+
+alt =
+#(define-music-function (parser location a b) (ly:music? ly:music?)
+  #{ \tag #'firstVerse { #a } \tag #'multiVerse { #b } #})

chord_settings.ly

@@ -138,3 +138,33 @@ generalLayout = \layout {
           }
         }
      #}))
+
+% If you add this engraver to ChordNames Context chords get only printed on chordchanges and if its the first chord after line break.
+Ensure_first_chord_after_line_break_printed_engraver =
+  #(lambda (ctx)
+     (define last-system-column-rank 0)
+     (make-engraver
+      (acknowledgers
+       ((chord-name-interface this-engraver grob source-engraver)
+          (ly:grob-set-property! grob 'after-line-breaking
+            (lambda (grob)
+              (let ((current-system-column-rank (car (ly:grob-spanned-column-rank-interval (ly:grob-system grob)))))
+                (if (and
+                       (ly:context-property ctx 'chordChanges #f)
+                       (ly:grob-property grob 'begin-of-line-visible #f)
+                       (not (= last-system-column-rank current-system-column-rank)))
+                  ; the current chord handling implementation in lilypond uses 'begin-of-line-visible to mark repeated chords
+                  (ly:grob-set-property! grob 'begin-of-line-visible #f))
+                (set! last-system-column-rank current-system-column-rank)
+                (ly:chord-name::after-line-breaking grob)
+                )))))))
+
+% If you add this engraver to ChordNames Context chords get only printed on chordchanges and not at newline.
+Ignoring_newline_chord_changes_engraver =
+  #(lambda (ctx)
+     (make-engraver
+      (acknowledgers
+       ((chord-name-interface this-engraver grob source-engraver)
+         (when (and (ly:context-property ctx 'chordChanges #f) (ly:grob-property grob 'begin-of-line-visible #f))
+                  (ly:grob-suicide! grob)
+                )))))

resolve_inherits.ly

@@ -0,0 +1,22 @@
+#(define (resolve-inherit-entry-in-list alist entry)
+  (let* ((key (car entry))
+        (attributes (cdr entry))
+        (inherits (assoc-ref attributes "inherits")))
+    (if inherits
+      (let* ((alist-without-entry (alist-delete key alist))
+            (inherit-entry (assoc inherits alist-without-entry))
+            (inherits-attributes (if inherit-entry (alist-copy (cdr (resolve-inherit-entry-in-list alist-without-entry inherit-entry)))))
+            (override-attributes (alist-delete "inherits" attributes)))
+        (if inherit-entry
+          (begin
+            (for-each (lambda (attribute) (assoc-set! inherits-attributes (car attribute) (cdr attribute))) override-attributes)
+            (cons key inherits-attributes)
+          )
+          (ly:error "~a can not inherit from ~a" key inherits))
+      )
+      entry
+    )))
+
+#(define (resolve-inherits alist)
+  (map (lambda (entry) (resolve-inherit-entry-in-list alist entry)) alist)
+)

verses_with_chords.ly

@@ -277,6 +277,7 @@
               \ChordNames
               \override VerticalAxisGroup.staff-affinity = ##f
               \override ChordName.extra-spacing-width = #'(-0.1 . 0.1)
+              \consists \Ensure_first_chord_after_line_break_printed_engraver
             }
             \context {
               \Score