MUSIC = { \transposable #TRANSPOSITION \MUSIC }

LAYOUT = \layout {
  \LAYOUT
  #(customized-layout LAYOUT)
}

verselayout = \layout {
  \LAYOUT
  \context {
    \ChordNames
    \override ChordName.font-size = \songTextChordFontSize
  }
}

TEXT = \markuplist {
  \override #`(transposition . ,TRANSPOSITION)
  \override #`(verselayout . ,verselayout)
  \override #`(verse-chords . ,#{ \chords { \verseChords } #})
  \override #`(verse-reference-voice . ,#{ \global \firstVoice  #})
  \handle-tag-groups \recordedTagGroups
  \TEXT
}

#(define TEXT_PAGES
  (map
    (lambda (text) #{
      \markuplist {
        \override #`(transposition . ,TRANSPOSITION)
        \override #`(verselayout . ,verselayout)
        \override #`(verse-chords . ,#{ \chords { \verseChords } #})
        \override #`(verse-reference-voice . ,#{ \global \firstVoice  #})
        \handle-tag-groups \recordedTagGroups
        #text
      }
    #})
  (if
    (and
      (defined? 'TEXT_PAGES)
      (pair? TEXT_PAGES))
    TEXT_PAGES
    (list TEXT))))

%% Add invisible ChordPro write trigger to last TEXT_PAGES markuplist
#(when (and (defined? 'chordpro-export-enabled) chordpro-export-enabled (pair? TEXT_PAGES))
  (let* ((last-index (- (length TEXT_PAGES) 1))
         (last-page (list-ref TEXT_PAGES last-index))
         (modified-last-page #{
           \markuplist {
             #last-page
             \chordpro-delayed-write
           }
         #}))
    (set! TEXT_PAGES
      (append (list-head TEXT_PAGES last-index)
              (list modified-last-page)))))

#(define (add-text-pages text-pages)
  (if (pair? text-pages)
    (begin
      (add-score (car text-pages))
      (for-each
        (lambda (text)
          (add-music (pageBreak))
          (add-score text))
        (cdr text-pages)))))

#(if (not noStandaloneOutput)
(begin
  (let ((header (ly:book-header HEADER)) (paper (ly:book-paper HEADER)))
    (if header (set! $defaultheader header))
    (if paper (set! $defaultpaper paper))
  )

  ;; Meta-Daten des Liedes als YAML neben die Ausgabedatei schreiben
  ;; (<ly:parser-output-name>.yml, landet wie das PDF relativ zum
  ;; Arbeitsverzeichnis). Die Textseiten-Strophen kommen aus dem
  ;; Render-Collector (chordpro.ily), deshalb wird erst bei der Ausgabe
  ;; geschrieben: unsichtbarer delayed Stencil an der letzten Textseite.
  ;; Ohne (nicht-leere) Textseiten gibt es keine Collector-Daten und die
  ;; yml wird sofort geschrieben.
  (when (and (defined? 'yaml-export-enabled) yaml-export-enabled)
    ;; Collector-Daten auch ohne ChordPro-Flag unter dem Ausgabenamen sammeln
    (set! chordpro-default-song-key (ly:parser-output-name))
    (if (any pair? TEXT_PAGES)
      (let* ((last-index (- (length TEXT_PAGES) 1))
             (last-page (list-ref TEXT_PAGES last-index))
             (trigger-stencil (yaml-delayed-song-write
                               (ly:parser-output-name) HEADER MUSIC))
             (modified-last-page #{
               \markuplist {
                 #last-page
                 \stencil #trigger-stencil
               }
             #}))
        (set! TEXT_PAGES
          (append (list-head TEXT_PAGES last-index)
                  (list modified-last-page))))
      (scm->yml-file
        (string-append (ly:parser-output-name) ".yml")
        (extract-song-data HEADER MUSIC #f (ly:parser-output-name)))))

  ;; ChordPro export (Einzellied): Song-Key ist der Ausgabename (die .cho
  ;; landet wie das PDF relativ zum Arbeitsverzeichnis); Titel/Autoren
  ;; kommen aus basicSongInfo in den per-Song-Store.
  (when (and (defined? 'chordpro-export-enabled) chordpro-export-enabled)
    (set! chordpro-default-song-key (ly:parser-output-name))
    (chordpro-register-song-metadata chordpro-default-song-key))

  (add-score #{
    \score {
      \MUSIC
      \layout { \LAYOUT }
    }#})
  (add-text-pages TEXT_PAGES)

  (add-score #{
    \score {
      \unfoldRepeats { \MUSIC \INLINESCOREMUSIC }
      \midi {
        \context {
          \Staff
          \remove "Staff_performer"
        }
        \context {
          \Voice
          \consists "Staff_performer"
        }
      }
    }#})
))