add default chordName exceptions

This update allows the alttitle header field to accept a list of alternative titles instead of a single value. Each title in the list is processed and added to the table of contents as an alternative title, enhancing flexibility and usability.

all_base_includes.ly

@@ -0,0 +1,41 @@
+#(define noStandaloneOutput (if (defined? 'noStandaloneOutput) noStandaloneOutput #f))
+
+#(define windows? (string-prefix-ci? "windows" (utsname:sysname (uname))))
+
+#(if (defined? 'LAYOUT) #f
+  (let ((scm-load (lambda (filename) (load (
+    string-append
+      ; on windows the detection of absolute pathes is broken (cause they start with a drive letter and not with a /)
+      ; so we have to use relative pathes for load. That works in frescobaldi, but not if you call lilypond from command line,
+      ; with a relative path to the .ly file, so we use absolute pathes on posix systems, where it works.
+      (if windows?
+        ""
+        (string-append (dirname (current-filename)) file-name-separator-string))
+      "scm" file-name-separator-string filename
+    )))))
+    (scm-load "json_parser.scm")
+    (scm-load "resolve_inherits.scm")
+    (scm-load "yaml_parser.scm")))
+#(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 "basic_format_and_style_settings.ly"
+\include "eps_file_from_song_dir.ly"
+\include "title_with_category_images.ly"
+\include "chord_settings.ly"
+\include "transposition.ly"
+\include "verses_with_chords.ly"
+\include "arrows_in_scores.ly"
+\include "swing_style.ly"
+\include "inline_score.ly"
+\include "custom_indentation.ily"
+
+% reset important variables
+LAYOUT = \layout { \generalLayout }
+HEADER = {}
+MUSIC = {}
+TEXT = \markuplist {""}
+
+verseChords = {}
+firstVoice = {}
+global = {}

appendix.ly

@@ -0,0 +1,44 @@
+appendix =
+#(define-void-function (parser location title) (markup?)
+  (define (appendix-item->markup layout props appendix-item)
+    (interpret-markup layout props
+      (markup
+          #:override (cons 'appendixItem:heading (assoc-ref appendix-item "heading"))
+          #:override (cons 'appendixItem:text (assoc-ref appendix-item "text"))
+          (ly:output-def-lookup layout 'appendixItemMarkup))))
+  (ly:book-add-bookpart! (ly:parser-lookup '$current-book)
+  #{
+    \bookpart {
+      \markup { #title }
+      #(for-each
+          (lambda (item)
+            (add-score (ly:make-page-label-marker (string->symbol (car item))))
+            (add-text
+              (make-on-the-fly-markup
+                (lambda (layout props arg) (appendix-item->markup layout props (cdr item)))
+                (make-null-markup)))
+          )
+        (reverse APPENDIX_DATA))
+    }
+  #}))
+
+#(define-markup-command (appendix-ref layout props label) (symbol?)
+  "call page-ref to appendix-item"
+  (interpret-markup layout props
+    (markup #:with-link label
+      #:override (cons 'appendixPage (make-page-ref-markup label "888" "?"))
+      (ly:output-def-lookup layout 'appendixReferenceMarkup))))
+
+\paper {
+  appendixItemMarkup = \markup {
+    \left-column {
+      \line { \large \bold \fromproperty #'appendixItem:heading }
+      \vspace #0.2
+      \sans \wordwrap-field #'appendixItem:text
+      \vspace #0.7
+    }
+  }
+  appendixReferenceMarkup = \markup {
+    \fromproperty #'appendixPage
+  }
+}

auto_rest_merging.ly

@@ -1,86 +0,0 @@
-%% http://lsr.dsi.unimi.it/LSR/Item?id=336
-%% see also http://code.google.com/p/lilypond/issues/detail?id=1228
-
-%% Usage:
-%%   \new Staff \with {
-%%     \override RestCollision.positioning-done = #merge-rests-on-positioning
-%%   } << \somevoice \\ \othervoice >>
-%% or (globally):
-%%   \layout {
-%%     \context {
-%%       \Staff
-%%       \override RestCollision.positioning-done = #merge-rests-on-positioning
-%%     }
-%%   }
-%%
-%% Limitations:
-%% - only handles two voices
-%% - does not handle multi-measure/whole-measure rests
-
-#(define (rest-score r)
-  (let ((score 0)
-	(yoff (ly:grob-property-data r 'Y-offset))
-	(sp (ly:grob-property-data r 'staff-position)))
-    (if (number? yoff)
-	(set! score (+ score 2))
-	(if (eq? yoff 'calculation-in-progress)
-	    (set! score (- score 3))))
-    (and (number? sp)
-	 (<= 0 2 sp)
-	 (set! score (+ score 2))
-	 (set! score (- score (abs (- 1 sp)))))
-    score))
-
-#(define (merge-rests-on-positioning grob)
-  (let* ((can-merge #f)
-	 (elts (ly:grob-object grob 'elements))
-	 (num-elts (and (ly:grob-array? elts)
-			(ly:grob-array-length elts)))
-	 (two-voice? (= num-elts 2)))
-    (if two-voice?
-	(let* ((v1-grob (ly:grob-array-ref elts 0))
-	       (v2-grob (ly:grob-array-ref elts 1))
-	       (v1-rest (ly:grob-object v1-grob 'rest))
-	       (v2-rest (ly:grob-object v2-grob 'rest)))
-	  (and
-	   (ly:grob? v1-rest)
-	   (ly:grob? v2-rest)
-	   (let* ((v1-duration-log (ly:grob-property v1-rest 'duration-log))
-		  (v2-duration-log (ly:grob-property v2-rest 'duration-log))
-		  (v1-dot (ly:grob-object v1-rest 'dot))
-		  (v2-dot (ly:grob-object v2-rest 'dot))
-		  (v1-dot-count (and (ly:grob? v1-dot)
-				     (ly:grob-property v1-dot 'dot-count -1)))
-		  (v2-dot-count (and (ly:grob? v2-dot)
-				     (ly:grob-property v2-dot 'dot-count -1))))
-	     (set! can-merge
-		   (and
-		    (number? v1-duration-log)
-		    (number? v2-duration-log)
-		    (= v1-duration-log v2-duration-log)
-		    (eq? v1-dot-count v2-dot-count)))
-	     (if can-merge
-		 ;; keep the rest that looks best:
-		 (let* ((keep-v1? (>= (rest-score v1-rest)
-				      (rest-score v2-rest)))
-			(rest-to-keep (if keep-v1? v1-rest v2-rest))
-			(dot-to-kill (if keep-v1? v2-dot v1-dot)))
-		   ;; uncomment if you're curious of which rest was chosen:
-		   ;;(ly:grob-set-property! v1-rest 'color green)
-		   ;;(ly:grob-set-property! v2-rest 'color blue)
-		   (ly:grob-suicide! (if keep-v1? v2-rest v1-rest))
-		   (if (ly:grob? dot-to-kill)
-		       (ly:grob-suicide! dot-to-kill))
-		   (ly:grob-set-property! rest-to-keep 'direction 0)
-		   (ly:rest::y-offset-callback rest-to-keep)))))))
-    (if can-merge
-	#t
-	(ly:rest-collision::calc-positioning-done grob))))
-
-generalLayout = \layout {
-  \generalLayout
-  \context {
-    \Staff
-    \override RestCollision.positioning-done = #merge-rests-on-positioning
-  }
-}

basic_format_and_style_settings.ly

@@ -1,8 +1,8 @@
 \language "deutsch"
 
-\include "default_author_style.ly"
+\include "default_style.ly"
-\include "styles.ly"
+\include "default_songinfo_style.ly"
-\include #(ly:format "styles/~a.ly" songStyle)
+\include "footer_with_songinfo.ly"
 
 \include #(if (defined? 'customStyleOverridesFile) customStyleOverridesFile "void.ly")
 
@@ -14,7 +14,6 @@
   property-defaults.fonts.sans = \songLyricFont
   %annotate-spacing = ##t
   % spacing stuff
-  lyric-size = #lyricSize
   two-sided = ##t
   inner-margin = 1.5\cm
   outer-margin = \songMargin
@@ -25,6 +24,11 @@
   markup-system-spacing = #'((basic-distance . 1))
   score-markup-spacing = #'((padding . 2))
   top-markup-spacing = #'((basic-distance . 0) (minimum-distance . 0) (padding . 0))
+  refMarkupFormatter = #(lambda (layout props stanzanumbers)
+    (interpret-markup layout props
+    (if (null? stanzanumbers)
+        refString
+        (ly:format refStringWithNumbers (string-join (map (lambda (stanzanumber) (ly:format "~a" stanzanumber)) stanzanumbers) ", ")))))
 }
 
 generalLayout = \layout {
@@ -39,7 +43,8 @@ generalLayout = \layout {
   }
   \context {
     \Staff
-    \accidentalStyle modern
+    \accidentalStyle modern-voice-cautionary
+    \consists Merge_rests_engraver
   }
   \context {
     \Score
@@ -61,6 +66,12 @@ generalLayout = \layout {
     \Voice
     % ich will lines breaken wie ich will!
     \remove "Forbid_line_break_engraver"
+    \override NoteHead.layer = 2
+    \override Dots.layer = 2
+    \override Stem.layer = 2
+    \override Flag.layer = 2
+    \override Beam.layer = 2
+    \override Accidental.layer = 2
   }
 }
 
@@ -72,27 +83,151 @@ textp = \lyricmode { \markup { \raise #1 \musicglyph #"rests.3" } }
 % zweite Stimme alles grau
 secondVoiceStyle = {
   \override NoteHead.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 Dots.layer = 1
+  \override Stem.layer = 1
+  \override Flag.layer = 1
+  \override Beam.layer = 1
+  \override Accidental.layer = 1
 }
 
 firstVoiceStyle = {
   \override NoteHead.color = #black
+  \override Dots.color = #black
   \override Stem.color = #black
   \override Flag.color = #black
   \override Beam.color = #black
+  \override Accidental.color = #black
 }
 
-% einzelne Noten innerhalb von \secondVoiceStyle mit schwarzem statt grauem Kopf
+% Deprecated: einzelne Noten innerhalb von \secondVoiceStyle mit schwarzem statt grauem Kopf
 schwarzkopf =
   #(define-music-function (parser location noten) (ly:music?)
-  #{
+    (begin (ly:warning "\\schwarzkopf brauchts nicht mehr, das kann ersatzlos weg!") noten))
-   \revert NoteHead.color
-   $noten
-   \override NoteHead.color = #grey
-  #})
 
-% hübsche Wiederholungszeichen für den Liedtext
+romanStanza =
-repStart = "𝄆"
+  #(define-music-function (parser location) ()
-repStop = "𝄇"
+  #{ \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* ((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)))
+#}
+)
+
+ref =
+#(define-music-function (stanzanumbers lyrics) ((number-list? (list)) ly:music?)
+#{ \lyricmode {
+    \once \override StanzaNumber.layer = 23 % set this to signal that there is a real stanza and no repeat signs
+    \set stanza = #(make-on-the-fly-markup (lambda (layout props m) ((ly:output-def-lookup layout 'refMarkupFormatter) layout props stanzanumbers)) (make-null-markup))
+    #lyrics
+  }
+#}
+)
+
+% prints a repStart Sign as stanza if the tag 'repeats is kept.
+% if there was a stanza already set by the stanza function with StanzaNumber.layer = 23 we set that also as stanza.
+repStartWithTag = \lyricmode {
+  \tag #'repeats {
+    \applyContext
+    #(lambda (context)
+      (let ((lastStanza (ly:context-property context 'stanza))
+            (printLastStanza (= (ly:assoc-get 'layer (ly:context-grob-definition context 'StanzaNumber) 0) 23))
+            (stanzaFontSeries (ly:assoc-get 'font-series (ly:context-grob-definition context 'StanzaNumber) 'normal)))
+      (ly:context-set-property! context 'stanza
+        (make-concat-markup
+          (if printLastStanza
+            (list (make-override-markup `(font-series . ,stanzaFontSeries) lastStanza) (make-hspace-markup 1) repStart)
+            (list repStart)
+            )))))
+    \once \override StanzaNumber.font-series = #'normal
+  }
+}
+
+repStopWithTag = \lyricmode {
+  \tag #'repeats {
+    \once \override StanzaNumber.font-series = #'normal
+    \once \override StanzaNumber.direction = 1
+    \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 } #})
+
+updown =
+#(define-music-function (parser location word) (string?)
+#{
+  \lyricmode {
+    \tag #'up { \markup { #(string-capitalize word) } }
+    \tag #'down { \markup { #(string-downcase word) } }
+  }
+#})
+
+dottedExtender = {
+  \override LyricExtender.style = #'dotted-line
+  \override LyricExtender.thickness = 2
+  \override LyricExtender.Y-offset = 0.1
+  \override LyricExtender.stencil =
+    #(lambda (grob)
+      (let* ((stil (ly:lyric-extender::print grob))
+             (nostil (null? stil))
+             (x-ext (if nostil 0 (ly:stencil-extent stil X))))
+         (if nostil
+           stil
+           (make-connected-line
+             (list
+               (cons (car x-ext) 0)
+               (cons (cdr x-ext) 0))
+             grob))))
+}
+
+melisOff = \set ignoreMelismata = ##t
+melisOn = \unset ignoreMelismata
+
+cue =
+#(define-music-function (zahlen) (number-list?)
+  #{
+      \tag #'cues {
+        \tweak self-alignment-X #LEFT
+        \mark 
+          #(make-on-the-fly-markup
+            (lambda (layout props m) (interpret-markup layout (prepend-alist-chain 'cues zahlen props) (ly:output-def-lookup layout 'cueMarkup)))
+            (make-null-markup))
+      }
+  #})

book_include.ly

@@ -1,5 +1,3 @@
-\version "2.18"
-
 #(define song-list '())
 
 #(define (files-in-directory dirname)
@@ -11,7 +9,7 @@
     	     (closedir dir)
     	     files)
     	    (else
-    	     (next (readdir dir) (if (string-match "^(0|\\.)" f) files (cons f files))))))))
+    	     (next (readdir dir) (if (ly:regex-match? (ly:regex-exec (ly:make-regex "^(0|\\.)") f)) files (cons f files))))))))
 
 #(define (file-to-stats filename)
    (set! song-list (cons filename song-list)))
@@ -120,7 +118,7 @@ includeSong =
      #{
      \bookOutputName #filename
      #}
-    (ly:parser-parse-string (if (< (list-ref (ly:version) 1) 19) (ly:parser-clone parser) (ly:parser-clone))
+    (ly:parser-parse-string (ly:parser-clone)
       (ly:format "\\include \"~a/~a/~a.ly\"" songPath filename filename))
     (let ((label (gensym "index")))
       (set! additional-page-switch-label-list
@@ -155,7 +153,7 @@ imagepage =
 songs =
 #(define-void-function (parser location) ()
  (for-each (lambda (songitems)
-   (ly:book-add-bookpart! (if (< (list-ref (ly:version) 1) 19) (ly:parser-lookup parser '$current-book) (ly:parser-lookup '$current-book))
+   (ly:book-add-bookpart! (ly:parser-lookup '$current-book)
     (let ((filename (car songitems))
           (songvars (cdr songitems)))
       (if (eq? filename 'emptyPage)

break_paged_output.ily

@@ -0,0 +1,2 @@
+\include "lilypond-book-preamble.ly"
+#(ly:set-option 'separate-page-formats "pdf")

chord_settings.ly

@@ -32,6 +32,42 @@ shiftChord = #(define-music-function (parser location xshift chord) (number? ly:
 	$chord
 #})
 
+shiftChords = #(define-music-function (parser location xshift chords) (number? ly:music?)
+#{
+	\override ChordName.extra-offset = #`(,xshift . 0)
+	$chords
+#})
+
+altChord =
+#(define-music-function (parser location mainchord altchord) (ly:music? ly:music?)
+  (let* ((remove-point-and-click
+           (lambda (grob)
+             (ly:grob-set-property! grob 'cause #f)
+             (ly:text-interface::print grob)))
+         (chord-name (lambda (in-pitches bass inversion context) #{
+           \markup {
+             \translate #'(-0.5 . 0)
+             \score {
+               \chords { \transposable #(cons (car (music-pitches mainchord)) (car in-pitches)) { #(music-clone mainchord) \klamm #(music-clone altchord) } }
+               \layout {
+                 \LAYOUT
+                 \context {
+                   \ChordNames
+                   \override ChordName.extra-spacing-width = #'(0 . 0.3)
+                   \override ChordName.stencil = #remove-point-and-click
+                 }
+                 \context {
+                   \Score
+                   \override SpacingSpanner.spacing-increment = 0
+                 }
+               }
+             }
+           }#})))
+    #{
+      \once \set chordNameFunction = #chord-name
+      #mainchord
+    #}))
+
 % kleine Mollakkorde und Alteration ausgeschrieben
 #(define (note-name->german-markup-nosym pitch lowercase?)
    (define (pitch-alteration-semitones pitch) (inexact->exact (round (* (ly:pitch-alteration pitch) 2))))
@@ -68,11 +104,42 @@ shiftChord = #(define-music-function (parser location xshift chord) (number? ly:
 % additional bass notes should get uppercased
 #(define (bassnote-name->german-markup-nosym pitch lowercase?)(note-name->german-markup-nosym pitch #f))
 
+defaultChordPrintings = {
+  <c g>-\markup { \super "5" }
+  %% Dur
+  <c e g a>-\markup { \super "6" } %Standardverhalten
+  <c e a >-\markup { \super "6(no5)" }
+  <c e g a d'>-\markup { \super "6/9" }
+  <c e g b d'>-\markup { \super "9" } %Standardverhalten
+  <c e g b d' f'>-\markup { \super "11" } %Standardverhalten
+  <c e g b d' a'>-\markup { \super "13" }
+  %add chords
+  <c e g d'>-\markup { \super "add9" }
+  <c e g f'>-\markup { \super "add11" }
+  <c e g a'>-\markup { \super "add13" }
+  %major chords
+  <c e g h d'>-\markup { \super "maj9" }
+  %% Moll
+  <c es g a>-\markup { \super "6" } %Standardverhalten
+  <c es a >-\markup { \super "6(no5)" }
+  <c es g a d'>-\markup { \super "6/9" }
+  <c es g b d'>-\markup { \super "9" } %Standardverhalten
+  <c es g b d' f'>-\markup { \super "11" } %Standardverhalten
+  <c es g b d' a'>-\markup { \super "13" }
+  %add chords
+  <c es g d'>-\markup { \super "add9" }
+  <c es g f'>-\markup { \super "add11" }
+  <c es g a'>-\markup { \super "add13" }
+  %major chords
+  <c es g h d'>-\markup { \super "maj9" }
+}
 
 #(define chordNameExceptions
-  (if (defined? 'customChordPrintings)
+  (append
-  (sequential-music-to-chord-exceptions customChordPrintings #t)
+    (if (defined? 'customChordPrintings)
-  '()))
+      (sequential-music-to-chord-exceptions customChordPrintings #t)
+      '())
+    (sequential-music-to-chord-exceptions defaultChordPrintings #t)))
 
 generalLayout = \layout {
   \generalLayout
@@ -81,7 +148,7 @@ generalLayout = \layout {
     \semiGermanChords
     \override ChordName.font-size = \songScoreChordFontSize
     \override ChordName.font-series = \songChordFontSeries
-    \override ChordName.font-family = #'sans
+    \override ChordName.font-family = #'serif
     chordNameLowercaseMinor = ##t
     chordChanges = ##t
     % eigenen chordRootNamer damit F# = Fis und Gb = Ges (also alteration ausgeschrieben)
@@ -89,16 +156,6 @@ generalLayout = \layout {
     chordNoteNamer = #bassnote-name->german-markup-nosym
     majorSevenSymbol = "maj7"
     chordNameExceptions = \chordNameExceptions
-    % der baseline-skip der Akkorde beeinflusst, wie hoch die Hochstellung ist
-    \override ChordName.baseline-skip = #1.0
-  }
-}
-
-verseChordLayout = \layout {
-  \generalLayout
-  \context {
-    \ChordNames
-    \override ChordName.font-size = \songTextChordFontSize
   }
 }
 
@@ -107,14 +164,42 @@ verseChordLayout = \layout {
    (interpret-markup layout props
      #{ \markup { \override #'(baseline-skip . 2)
           \center-column {
-            \score { \new ChordNames { #(if (< (list-ref (ly:version) 1) 19)
+            \score { \new ChordNames {
-              (ly:parser-include-string parser (string-append "\\chordmode { s4 " chord " }"))
+              #(ly:parser-include-string (string-append "\\chordmode { s4 " chord " }"))
-              (ly:parser-include-string (string-append "\\chordmode { s4 " chord " }"))
+            } \layout { \generalLayout } }
-              ) } \layout { \generalLayout } }
+            \override #'(fret-diagram-details . ((barre-type . straight))) {
-            \override #'(fret-diagram-details . (
+              \fret-diagram-terse #fret
-                     (barre-type . straight))) {
-            \fret-diagram-terse #fret
             }
           }
         }
      #}))
+
+% 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)
+                )))))

custom_indentation.ily

@@ -0,0 +1,135 @@
+% https://lsr.di.unimi.it/LSR/Snippet?id=1098
+%%%%%%%% HEADER %%%%%%%%
+%
+% this code was prompted by
+% https://lists.gnu.org/archive/html/lilypond-user/2019-07/msg00139.html
+% and offers a pseudoIndent hack suitable for general use
+
+% keywords:
+% indent short-indent indentation system line
+% mid-score temporarily arbitrary individual single just only once
+% coda margin
+% mouse's tale acrostic mesostic spine
+
+%%%%%%%% PSEUDOINDENT FUNCTIONS %%%%%%%%
+
+% these two functions are for indenting individual systems
+% - to left-indent a system, apply \pseudoIndent before the music continues
+% - \pseudoIndents is similar, but lets you also indent on the right
+% - both provide an option for changing that system's instrument names
+
+% N.B. these functions
+% - assume application to non-ragged lines (generally the default)
+% - include a manual \break to ensure application at line start
+% - misbehave if called more than once at the same line start
+
+% the parameters of the (full) pseudoIndents function are:
+% 1: name-tweaks
+%      usually omitted; accepts replacement \markup for instrument names
+%      as an ordered list; starred elements leave their i-names unchanged.
+% 2: left-indent
+%      additional left-indentation, in staff-space units; can be negative,
+%      but avoid a total indentation which implies (unsupported) stretching.
+% 3: right-indent
+%      amount of right-indentation, in staff-space units; can be negative.
+%      - not offered by the (reduced) pseudoIndent function
+
+
+pseudoIndents = % inline alternative to a new \score, also with right-indent
+#(define-music-function (name-tweaks left-indent right-indent)
+  ((markup-list? '()) number? number?)
+  (define (warn-stretched p1 p2) (ly:input-warning (*location*) (G_
+    " pseudoIndents ~s ~s is stretching staff; expect distorted layout") p1 p2))
+  (let* (
+    (narrowing (+ left-indent right-indent)) ; of staff implied by args
+
+    (set-staffsymbol! (lambda (staffsymbol-grob) ; change staff to new width
+      (let* (
+        (left-bound (ly:spanner-bound staffsymbol-grob LEFT))
+        (left-moment (ly:grob-property left-bound 'when))
+        (capo? (moment<=? left-moment ZERO-MOMENT)) ; in first system of score
+        (layout (ly:grob-layout staffsymbol-grob))
+        (lw (ly:output-def-lookup layout 'line-width)) ; debugging info
+        (indent (ly:output-def-lookup layout (if capo? 'indent 'short-indent)))
+        (old-stil (ly:staff-symbol::print staffsymbol-grob))
+        (staffsymbol-x-ext (ly:stencil-extent old-stil X))
+        ;; >=2.19.16's first system has old-stil already narrowed [2]
+        ;; compensate for this (ie being not pristine) when calculating
+        ;; - old leftmost-x (its value is needed when setting so-called 'width)
+        ;; - the new width and position (via local variable narrowing_)
+        (ss-t (ly:staff-symbol-line-thickness staffsymbol-grob))
+        (pristine? (<= 0 (car staffsymbol-x-ext) ss-t)) ; would expect half
+        (leftmost-x (+ indent (if pristine? 0 narrowing)))
+        (narrowing_ (if pristine? narrowing 0)) ; uses 0 if already narrowed
+        (old-width (+ (interval-length staffsymbol-x-ext) ss-t))
+        (new-width (- old-width narrowing_))
+        (new-rightmost-x (+ leftmost-x new-width)) ; and set! this immediately
+        (junk (ly:grob-set-property! staffsymbol-grob 'width new-rightmost-x))
+        (in-situ-stil (ly:staff-symbol::print staffsymbol-grob))
+        (new-stil (ly:stencil-translate-axis in-situ-stil narrowing_ X))
+       ;(new-stil (stencil-with-color new-stil red)) ; for when debugging
+        (new-x-ext (ly:stencil-extent new-stil X)))
+      (ly:grob-set-property! staffsymbol-grob 'stencil new-stil)
+      (ly:grob-set-property! staffsymbol-grob 'X-extent new-x-ext)
+      )))
+
+    (set-X-offset! (lambda (margin-grob) ; move grob across to line start
+      (let* (
+        (old (ly:grob-property-data margin-grob 'X-offset))
+        (new (lambda (grob) (+ (if (procedure? old) (old grob) old) narrowing))))
+      (ly:grob-set-property! margin-grob 'X-offset new))))
+
+    (tweak-text! (lambda (i-name-grob mkup) ; tweak both instrumentname texts
+      (if (and (markup? mkup) (not (string=? (markup->string mkup) "*")))
+      (begin
+        (ly:grob-set-property! i-name-grob 'long-text mkup)
+        (ly:grob-set-property! i-name-grob 'text mkup)
+        )))) ; else retain existing text
+
+    (install-narrowing (lambda (leftedge-grob) ; on staves, + adapt left margin
+      (let* (
+        (sys (ly:grob-system leftedge-grob))
+        (all-grobs (ly:grob-array->list (ly:grob-object sys 'all-elements)))
+        (grobs-named (lambda (name)
+          (filter (lambda (x) (eq? name (grob::name x))) all-grobs)))
+        (first-leftedge-grob (list-ref (grobs-named 'LeftEdge) 0))
+        (relsys-x-of (lambda (g) (ly:grob-relative-coordinate g sys X)))
+        (leftedge-x (relsys-x-of first-leftedge-grob))
+        (leftedged? (lambda (g) (= (relsys-x-of g) leftedge-x)))
+        (leftedged-ss (filter leftedged? (grobs-named 'StaffSymbol))))
+      (if (eq? leftedge-grob first-leftedge-grob) ; ignore other leftedges [1]
+       (begin
+         (for-each set-staffsymbol! leftedged-ss)
+         (for-each set-X-offset! (grobs-named 'SystemStartBar))
+         (for-each set-X-offset! (grobs-named 'InstrumentName))
+         (for-each tweak-text! (grobs-named 'InstrumentName) name-tweaks)
+       ))))))
+
+  (if (negative? narrowing) (warn-stretched left-indent right-indent))
+  #{ % and continue anyway
+    % ensure that these overrides are applied only at begin-of-line
+    \break % (but this does not exclude unsupported multiple application)
+    % give the spacing engine notice regarding the loss of width for music
+    \once \override Score.LeftEdge.X-extent = #(cons narrowing narrowing)
+    % discard line start region of staff and reassemble left-margin elements
+    \once \override Score.LeftEdge.after-line-breaking = #install-narrowing
+    % shift the system to partition the narrowing between left and right
+    \overrideProperty Score.NonMusicalPaperColumn.line-break-system-details
+    .X-offset #(- right-indent)
+    % prevent a leftmost barnumber entering a stretched staff
+    \once \override Score.BarNumber.horizon-padding = #(max 1 (- 1 narrowing))
+  #}))
+
+pseudoIndent = % for changing just left-indent
+#(define-music-function (name-tweaks left-indent)
+  ((markup-list? '()) number?)
+  #{
+    \pseudoIndents $name-tweaks $left-indent 0
+  #})
+
+% [1] versions <2.19.1 can have end-of-line leftedges too
+%     - these were eliminated in issue 3761
+% [2] versions >=2.19.16: the first system behaves differently from the rest
+%     - a side effect of issue 660 ?
+% [3] versions >=2.23.0: LeftEdge's position may well differ in Y (but not in X)
+%     - a side effect of issue 6084 ?

default_author_style.ly

@@ -1,26 +0,0 @@
-\paper {
-  authorMarkup =
-    #(make-on-the-fly-markup
-      (lambda (layout props m)
-        (let ((name (chain-assoc-get 'author:name props #f))
-             (trail_name (chain-assoc-get 'author:trail_name props #f))
-             (birth_year (chain-assoc-get 'author:birth_year props #f))
-             (death_year (chain-assoc-get 'author:death_year props #f))
-             (organization (chain-assoc-get 'author:organization props #f)))
-          (interpret-markup layout props
-            (string-append
-              name
-              (if trail_name (ly:format " (~a)" trail_name) "")
-              (if (and birth_year death_year)
-                (ly:format ", (~a‒~a)" birth_year death_year)
-                (if birth_year
-                  (ly:format ", (*~a)" birth_year)
-                  (if death_year (ly:format ", (†~a)" death_year) "")))
-              (if organization (ly:format ", ~a" organization) "")
-          ))))
-      (make-null-markup)
-    )
-  poetMarkup = \markup { "Worte:" \fromproperty #'author }
-  composerMarkup = \markup { "Weise:" \fromproperty #'author }
-  poetAndComposerEqualMarkup = \markup { "Worte und Weise:" \fromproperty #'author }
-}

default_output.ly

@@ -0,0 +1,7 @@
+#(define noDefaultOutput (if (defined? 'noDefaultOutput) noDefaultOutput #f))
+HEADER = \bookpart {
+  \header {
+    \basicSongInfo
+  }
+}
+\include #(if noDefaultOutput "void.ly" "standalone_output.ly")

default_songinfo_style.ly

@@ -0,0 +1,72 @@
+\paper {
+  poetPrefix = "Worte:"
+  composerPrefix = "Weise:"
+  compositionPrefix = "Satz:"
+  poetAndComposerEqualPrefix = "Worte und Weise:"
+  voicePrefix = "Stimme:"
+  versePrefix = "Strophe:"
+  translationPrefix = "Übersetzung:"
+  interludePrefix = "Zwischenspiel:"
+  bridgePrefix = "Bridge:"
+
+  authorFormat =
+    #(lambda (noDetails name trail_name birth_year death_year organization)
+        (let ((string-present (lambda (str) (and str (not (and (string? str) (string-null? str))))))
+              (render_informations (lambda (infolist) (string-append (car infolist) (if (or noDetails (null? (cdr infolist))) "" (string-append " (" (string-join (cdr infolist) ", ") ")"))))))
+            (if (or (string-present trail_name) (string-present name))
+              (render_informations (filter string-present (list
+                trail_name
+                name
+                (if (and (string-present birth_year) (string-present death_year))
+                  (ly:format "~a‒~a" birth_year death_year)
+                  (if (string-present birth_year)
+                    (ly:format "*~a" birth_year)
+                    (if (string-present death_year) (ly:format "†~a" death_year) "")))
+                organization
+              )))
+              ""
+          )))
+
+  songinfoMarkup =
+    #(make-on-the-fly-markup
+      (lambda (layout props m)
+        (let* ((between-poet-and-composer-markup (chain-assoc-get 'header:between-poet-and-composer-markup props (make-hspace-markup 3)))
+              (poet-maybe-with-composer (chain-assoc-get 'songinfo:poet-maybe-with-composer props #f))
+              (composer (chain-assoc-get 'songinfo:composer props #f))
+              (copyright (chain-assoc-get 'songinfo:copyright props #f))
+              (infotext (chain-assoc-get 'songinfo:infotext props #f))
+              (translation (chain-assoc-get 'songinfo:translation props #f))
+              (pronunciation (chain-assoc-get 'songinfo:pronunciation props #f))
+              (year_text (chain-assoc-get 'songinfo:year_text props #f))
+              (year_melody (chain-assoc-get 'songinfo:year_melody props #f))
+              (poet-with-year (if (and poet-maybe-with-composer year_text) (string-append poet-maybe-with-composer ", " year_text) poet-maybe-with-composer))
+              (composer-with-year (if (and composer year_melody) (string-append composer ", " year_melody) composer))
+              (poet-and-composer-oneliner (if (and poet-with-year composer-with-year) (markup poet-with-year between-poet-and-composer-markup composer-with-year) #f))
+              (current-line-width (chain-assoc-get 'line-width props (ly:output-def-lookup layout 'line-width)))
+              (string-with-paragraphs->markuplist (lambda (prefix text)
+                (if text
+                  (apply append
+                    (map
+                      (lambda (paragraph)
+                        (make-wordwrap-internal-markup-list #t
+                          #{ \markuplist { $(ly:parser-include-string paragraph) } #}))
+                      (ly:regex-split (ly:make-regex "\n[ \t\n]*\n[ \t\n]*") text)))
+                  '()))))
+          (stack-lines DOWN 0.0 (chain-assoc-get 'baseline-skip props)
+            (interpret-markup-list layout props
+              (append
+                (if (and poet-and-composer-oneliner (< (interval-length (ly:stencil-extent (interpret-markup layout props poet-and-composer-oneliner) X)) current-line-width))
+                  (list poet-and-composer-oneliner)
+                  (make-wordwrap-string-internal-markup-list #t (string-append
+                    (if poet-with-year (string-append "\n\n" poet-with-year) "")
+                    (if composer-with-year (string-append "\n\n" composer-with-year) "")
+                  )))
+                (make-wordwrap-string-internal-markup-list #t (string-append
+                  (if copyright (string-append "\n\n© " copyright) "")))
+                (string-with-paragraphs->markuplist "" infotext)
+                (string-with-paragraphs->markuplist "Übersetzung: " translation)
+                (string-with-paragraphs->markuplist "Aussprache: " pronunciation)
+                  )))))
+      (make-null-markup)
+    )
+}

default_style.ly

@@ -0,0 +1,35 @@
+songFormatAndSize = "a5"
+songMargin = 5
+songInfoFontSize = 0
+songInfoLineWidthFraction = 0.9
+songTitleSize = 6
+songTitleFont = "Liberation Sans"
+songChordFont = "Liberation Sans"
+songLyricFont = "Liberation Sans"
+songChordFontSeries = #'bold
+songTextChordAlignment = #'left
+songScoreChordFontSize = 2
+songTextChordFontSize = \songScoreChordFontSize
+songTextChordDistance = 2.8
+songTextLineHeigth = 5.8
+songTocColumns = 3
+globalSize = 15
+lyricSize = 1.6
+stanzaFormat = "~a."
+romanStanzaFormat = "~@r."
+refString = "Ref.:"
+refStringWithNumbers = "Ref. ~a:"
+% hübsche Wiederholungszeichen für den Liedtext
+repStart = "𝄆"
+repStop = "𝄇"
+customChordPrintings = {}
+
+\paper {
+  cueMarkup = \markup {
+    \italic
+      #(make-on-the-fly-markup (lambda (layout props m)
+        (interpret-markup layout props
+          (string-join (map (lambda (n) (format #f "~@r." n)) (chain-assoc-get 'cues props)) ", ")))
+        (make-null-markup))
+  }
+}

footer_with_songinfo.ly

@@ -1,3 +1,35 @@
+#(use-modules (ice-9 receive))
+#(define (format-author author-format-function authorId noDetails)
+  (let ((author (if (defined? 'AUTHOR_DATA) (assoc-ref AUTHOR_DATA authorId) #f)))
+    (if author
+      (author-format-function
+        noDetails
+        (assoc-ref author "name")
+        (assoc-ref author "trail_name")
+        (assoc-ref author "birth_year")
+        (assoc-ref author "death_year")
+        (assoc-ref author "organization")
+      )
+      (if (string-null? authorId)
+          "unbekannt"
+          authorId))))
+
+#(define (find-author-ids-by contributionType authors)
+  (if authors
+    (filter-map (lambda (authordata) (if (member contributionType (cdr authordata)) (car authordata) #f)) authors)
+    (list)))
+
+#(define (find-author-id-with-part-numbers contributionType authors)
+  (if authors
+    (sort-list
+      (filter-map (lambda (authordata)
+        (let ((contributionNumbers (filter-map (lambda (contribution) (if (and (list? contribution) (equal? contributionType (car contribution))) (cadr contribution) #f)) (cdr authordata)))
+              (authorId (car authordata)))
+          (if (null? contributionNumbers) #f (cons authorId (sort-list contributionNumbers <)))
+        )) authors)
+      (lambda (a b) (< (cadr a) (cadr b))))
+    (list)))
+
 #(define-markup-command (print-songinfo layout props) ()
   (define (songinfo-from songId key)
     (let ((song (if (defined? 'SONG_DATA) (assoc-ref SONG_DATA songId) #f)))
@@ -5,60 +37,163 @@
         (assoc-ref song key)
         (ly:warning (ly:format "song with id ~a not found" songId)))))
 
-  (define (format-author authorId)
+  (define* (default-author-format authorId #:optional (noDetails #f))
-    (let ((author (if (defined? 'AUTHOR_DATA) (assoc-ref AUTHOR_DATA authorId) #f)))
+    (format-author (ly:output-def-lookup layout 'authorFormat) authorId noDetails))
-      (if author
-        (markup
-          #:override (cons 'author:name (assoc-ref author "name"))
-          #:override (cons 'author:trail_name (assoc-ref author "trail_name"))
-          #:override (cons 'author:birth_year (assoc-ref author "birth_year"))
-          #:override (cons 'author:death_year (assoc-ref author "death_year"))
-          #:override (cons 'author:organization (assoc-ref author "organization"))
-          (ly:output-def-lookup layout 'authorMarkup))
-        (ly:warning (ly:format "author with id ~a not found" authorId)))))
 
   (define (format-poet poetId)
-    (markup #:override (cons 'author (format-author poetId)) (ly:output-def-lookup layout 'poetMarkup)))
+    (string-append (ly:output-def-lookup layout 'poetPrefix) " " (default-author-format poetId)))
 
   (define (format-composer composerId)
-    (markup #:override (cons 'author (format-author composerId)) (ly:output-def-lookup layout 'composerMarkup)))
+    (string-append (ly:output-def-lookup layout 'composerPrefix) " " (default-author-format composerId)))
 
   (define (format-poet-and-composer authorId)
-    (markup #:override (cons 'author (format-author authorId)) (ly:output-def-lookup layout 'poetAndComposerEqualMarkup)))
+    (string-append (ly:output-def-lookup layout 'poetAndComposerEqualPrefix) " " (default-author-format authorId)))
+
+  (define (numbered-contribution-prefix contributionNumbers prefixLookup)
+    (string-append
+      (string-join (map (lambda (contributionNumber) (ly:format "~a." contributionNumber)) contributionNumbers) ", ")
+      " "
+      (ly:output-def-lookup layout prefixLookup)
+    )
+  )
+
+  (define referencedAuthors '())
+
+  (define (format-authors authorIds)
+    (map (lambda (authorId)
+      (default-author-format
+        authorId
+        (if (member authorId referencedAuthors)
+          #t
+          (begin
+            (set! referencedAuthors (cons authorId referencedAuthors))
+            #f)))
+    ) authorIds)
+  )
+
+  (define (render-contribution-group contributionPrefix authorIds)
+    (if (null? authorIds)
+      ""
+      (string-append contributionPrefix " " (string-join (format-authors authorIds) ", ")))
+  )
+
+  (define (join-present items joiner)
+    (string-join (filter (lambda (item) (and (string? item) (not (string-null? (string-trim-both item))))) items) joiner)
+  )
+
+  (define (render-partial-contribution-group prefixLookup authorData)
+    (if (null? authorData)
+      ""
+      (let ((firstAuthorContributions (cdar authorData)))
+        (receive (authorDataSame authorDataOther)
+            (partition (lambda (authorEntry) (equal? (cdr authorEntry) firstAuthorContributions)) authorData)
+          (join-present (list
+            (render-contribution-group (numbered-contribution-prefix firstAuthorContributions prefixLookup) (map car authorDataSame))
+            (render-partial-contribution-group prefixLookup authorDataOther)
+            ) " ")))))
+
+  (define (poet-and-composer-from-authors authors)
+    (if authors
+      (let (
+            (poetIds (find-author-ids-by 'text authors))
+            (translatorIds (find-author-ids-by 'translation authors))
+            (versePoetData (find-author-id-with-part-numbers 'verse authors))
+            (composerIds (find-author-ids-by 'melody authors))
+            (verseComposerData (find-author-id-with-part-numbers 'meloverse authors))
+            (voiceComposerData (find-author-id-with-part-numbers 'voice authors))
+            (compositionIds (find-author-ids-by 'composition authors))
+            (bridgeIds (find-author-ids-by 'bridge authors))
+            (interludeIds (find-author-ids-by 'interlude authors))
+            (year_text (chain-assoc-get 'header:year_text props #f))
+            (year_translation (chain-assoc-get 'header:year_translation props #f))
+            (year_melody (chain-assoc-get 'header:year_melody props #f))
+            (year_composition (chain-assoc-get 'header:year_composition props #f))
+            )
+        (if (and (equal? poetIds composerIds) (null? translatorIds) (null? versePoetData) (null? verseComposerData) (null? voiceComposerData) (null? compositionIds) (null? bridgeIds) (null? interludeIds))
+          (list
+            (join-present (list
+              (render-contribution-group (ly:output-def-lookup layout 'poetAndComposerEqualPrefix) poetIds)
+              (if (equal? year_text year_melody) year_text (join-present (list year_text year_melody) "/"))
+            ) ", ")
+            #f)
+          (list
+            (if (and (null? poetIds) (null? versePoetData) (null? translatorIds)) #f
+              (string-append
+                (ly:output-def-lookup layout 'poetPrefix)
+                " "
+                (join-present (list
+                  (join-present (list
+                    (render-contribution-group "" poetIds)
+                    year_text
+                  ) ", ")
+                  (render-partial-contribution-group 'versePrefix versePoetData)
+                  (join-present (list
+                    (render-contribution-group (ly:output-def-lookup layout 'translationPrefix) translatorIds)
+                    year_translation
+                  ) ", ")
+                ) "; ")
+              ))
+            (if (and (null? composerIds) (null? compositionIds) (null? verseComposerData) (null? voiceComposerData) (null? bridgeIds) (null? interludeIds)) #f
+              (string-append
+                (ly:output-def-lookup layout 'composerPrefix)
+                " "
+                (join-present (list
+                  (join-present (list
+                    (render-contribution-group "" composerIds)
+                    year_melody
+                  ) ", ")
+                  (render-partial-contribution-group 'versePrefix verseComposerData)
+                  (render-partial-contribution-group 'voicePrefix voiceComposerData)
+                  (join-present (list
+                    (render-contribution-group (ly:output-def-lookup layout 'compositionPrefix) compositionIds)
+                    year_composition
+                  ) ", ")
+                  (render-contribution-group (ly:output-def-lookup layout 'bridgePrefix) bridgeIds)
+                  (render-contribution-group (ly:output-def-lookup layout 'interludePrefix) interludeIds)
+                ) "; ")
+              )))))
+      (list #f #f)
+    )
+  )
 
   (interpret-markup layout props
     (if (chain-assoc-get 'page:is-bookpart-last-page props #f)
-    (let* ((songId (chain-assoc-get 'header:songId props #f))
+    (let* ((authors (chain-assoc-get 'header:authors props #f))
+           (poet-and-composers (poet-and-composer-from-authors authors))
+           (songId (chain-assoc-get 'header:songId props #f))
            (poetId (chain-assoc-get 'header:poetId props (if songId (songinfo-from songId "poet") #f)))
            (composerId (chain-assoc-get 'header:composerId props (if songId (songinfo-from songId "composer") #f)))
            (poet-and-composer-same (equal? poetId composerId)))
-      (let (
+      (let ((infotext (chain-assoc-get 'header:infotext props (chain-assoc-get 'header:songinfo props #f)))
-            (blockwidth (* (chain-assoc-get 'header:songinfo-size-factor props 0.9) (ly:output-def-lookup layout 'line-width)))
+            (poet-maybe-with-composer (chain-assoc-get 'header:poet props (if poetId (if poet-and-composer-same (format-poet-and-composer poetId) (format-poet poetId)) (car poet-and-composers))))
-            (infotext (chain-assoc-get 'header:songinfo props #f))
+            (composer (chain-assoc-get 'header:composer props (if (and composerId (not poet-and-composer-same)) (format-composer composerId) (cadr poet-and-composers))))
-            (poet (chain-assoc-get 'header:poet props (if poetId (if poet-and-composer-same (format-poet-and-composer poetId) (format-poet poetId)) #f)))
+            (copyright (chain-assoc-get 'header:copyright props #f))
-            (composer (chain-assoc-get 'header:composer props (if (and composerId (not poet-and-composer-same)) (format-composer composerId) #f)))
+            (translation (chain-assoc-get 'header:translation props #f))
-            (poet-and-composer-stacked (chain-assoc-get 'header:poet-and-composer-stacked props songInfoPoetAndComposerStacked))
+            (pronunciation (chain-assoc-get 'header:pronunciation props #f))
-            (between-poet-and-composer-markup (chain-assoc-get 'header:between-poet-and-composer-markup props (make-hspace-markup 3)))
+            (year_text (if (string? (car poet-and-composers)) #f (chain-assoc-get 'header:year_text props #f)))
-            (copyright (chain-assoc-get 'header:copyright props #f)))
+            (year_melody (if (string? (car poet-and-composers)) #f (chain-assoc-get 'header:year_melody props #f))))
-            (markup #:override '(baseline-skip . 3.0) (
+            (markup
-                make-fontsize-markup songInfoFontSize
+              #:override (cons 'songinfo:poet-maybe-with-composer
-                (make-sans-markup
+                (if (and poet-maybe-with-composer (not (and (string? poet-maybe-with-composer) (string-null? poet-maybe-with-composer)))) poet-maybe-with-composer #f))
-                ;%\override #'(line-width . 92) \wordwrap-field #symbol
+              #:override (cons 'songinfo:composer
-                (make-column-markup (list
+                (if (and composer (not (and (string? composer) (string-null? composer)))) composer #f))
-                  (make-line-markup
+              #:override (cons 'songinfo:copyright
-                   (list
+                (if (and copyright (not (and (string? copyright) (string-null? copyright)))) copyright #f))
-                    (if (and poet (not (and (string? poet) (string-null? poet)))) (markup poet between-poet-and-composer-markup) "")
+              #:override (cons 'songinfo:infotext
-                    (if (and composer (not poet-and-composer-stacked)) composer ""))
+                (if (and infotext (not (and (string? infotext) (string-null? infotext)))) infotext #f))
-                  )
+              #:override (cons 'songinfo:translation
-                  (if (and composer poet-and-composer-stacked) (make-line-markup (list composer)) "")
+                (if (and translation (not (and (string? translation) (string-null? translation)))) translation #f))
-                  (make-override-markup `(line-width . ,blockwidth) (make-justify-string-markup (string-append
+              #:override (cons 'songinfo:pronunciation
-                    (if (and copyright (not (and (string? copyright) (string-null? copyright)))) (ly:format "© ~a\n\n" copyright) "")
+                (if (and pronunciation (not (and (string? pronunciation) (string-null? pronunciation)))) pronunciation #f))
-                    (if infotext infotext "")
+              #:override (cons 'songinfo:year_text
-                  )))
+                (if (and year_text (not (and (string? year_text) (string-null? year_text)))) year_text #f))
-                )))
+              #:override (cons 'songinfo:year_melody
-              )
+                (if (and year_melody (not (and (string? year_melody) (string-null? year_melody)))) year_melody #f))
-            )
+              #:override '(baseline-skip . 3.0)
-          ))
+              #:fontsize songInfoFontSize
+              #:sans
+              (ly:output-def-lookup layout 'songinfoMarkup)
+            )))
       (make-null-markup)))
 )
 
@@ -72,6 +207,12 @@
         )
    ))))
 
+#(define-markup-command (fractional-line-width layout props arg)(markup?)
+  (interpret-markup layout props
+    (make-override-markup
+      `(line-width . ,(* (chain-assoc-get 'header:songinfo-size-factor props songInfoLineWidthFraction) (ly:output-def-lookup layout 'line-width)))
+      arg)))
+
 \paper {
   print-first-page-number = ##t
   first-page-number = #0
@@ -79,14 +220,14 @@
   oddFooterMarkup = \markup {
     \fill-line {
       \line { \null }
-      \line { \general-align #Y #DOWN \print-songinfo }
+      \line { \if \on-last-page-of-part \general-align #Y #DOWN \fractional-line-width \print-songinfo }
       \line { \if \should-print-page-number \print-pagenumber }
     }
   }
   evenFooterMarkup  = \markup {
     \fill-line {
       \line { \if \should-print-page-number \print-pagenumber }
-      \line { \general-align #Y #DOWN \print-songinfo }
+      \line { \if \on-last-page-of-part \general-align #Y #DOWN \fractional-line-width \print-songinfo }
       \line { \null }
     }
   }

general_include.ly

@@ -1,28 +1,6 @@
-\version "2.18"
+\version "2.25.8"
-
 #(ly:set-option 'relative-includes #t)
 
-\include #(if (< (list-ref (ly:version) 1) 24) "legacy-lilypond-compatibility.ly" "void.ly")
+#(define noDefaultOutput #t)
 
-#(define noStandaloneOutput (if (defined? 'noStandaloneOutput) noStandaloneOutput #f))
+\include "all_base_includes.ly"
-
-#(if (defined? 'LAYOUT) #f (load "json_parser.scm"))
-#(use-modules (json parser))
-\include "basic_format_and_style_settings.ly"
-\include #(if (< (list-ref (ly:version) 1) 25) "legacy-lilypond-compatibility-pre-2.25.ly" "void.ly")
-\include "eps_file_from_song_dir.ly"
-\include "title_with_category_images.ly"
-\include "footer_with_songinfo.ly"
-\include "auto_rest_merging.ly"
-\include "chord_settings.ly"
-\include "transposition.ly"
-\include "verses_with_chords.ly"
-\include "arrows_in_scores.ly"
-\include "swing_style.ly"
-\include "inline_score.ly"
-
-% reset important variables
-LAYOUT = \layout { \generalLayout }
-HEADER = {}
-MUSIC = {}
-TEXT = \markuplist {""}

inline_score.ly

@@ -4,5 +4,10 @@ inline-score =
 #(define-music-function (music) (ly:music?)
    (set! INLINESCOREMUSIC #{ \INLINESCOREMUSIC #music #})
     #{
-      \transposable #music
+      \transposable #TRANSPOSITION #music
     #})
+
+fill-midi =
+#(define-void-function (music) (ly:music?)
+   (set! INLINESCOREMUSIC #{ \INLINESCOREMUSIC #music #})
+)

legacy-lilypond-compatibility-pre-2.25.ly

@@ -1,22 +0,0 @@
-% guile regular expressions aktivieren:
-#(use-modules (ice-9 regex))
-
-#(define ly:make-regex make-regexp)
-#(define ly:regex-exec regexp-exec)
-#(define ly:regex-match-substring match:substring)
-#(define (ly:regex-replace pattern text . replacements)
-  (apply regexp-substitute/global #f pattern text 'pre (append replacements (list 'post))))
-
-
-% old font handling
-
-#(define (default-pango size)
-  (make-pango-font-tree
-    songChordFont
-    songLyricFont
-    "Luxi Mono"
-    (/ size 20)))
-
-\paper {
-  #(define fonts (default-pango globalSize))
-}

legacy-lilypond-compatibility.ly

@@ -1,27 +0,0 @@
-% this is to be compatible to older lilypond versions
-\version "2.18.0"
-
-#(define (on-first-page layout props)
-  "Whether the markup is printed on the first page of the book."
-  (= (chain-assoc-get 'page:page-number props -1)
-     (book-first-page layout props)))
-
-#(define-markup-command (if layout props condition? argument)
-  (procedure? markup?)
-  #:category conditionals
-  (if (condition? layout props)
-      (interpret-markup layout props argument)
-      empty-stencil))
-
-#(define (on-first-page-of-part layout props)
-  "Whether the markup is printed on the first page of the book part."
-  (= (chain-assoc-get 'page:page-number props -1)
-     (ly:output-def-lookup layout 'first-page-number)))
-
-#(define (should-print-page-number layout props)
-  "Whether the page number should be printed on this page.  This depends
-on the settings @code{print-@/page-@/numbers} and
-@code{print-@/first-@/page-@/number} of the @code{\\paper} block."
-  (and (eq? #t (ly:output-def-lookup layout 'print-page-number))
-       (or (not (on-first-page layout props))
-           (eq? #t (ly:output-def-lookup layout 'print-first-page-number)))))

scm/resolve_inherits.scm

@@ -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)
+)

scm/yaml_parser.scm

@@ -0,0 +1,25 @@
+(if (not windows?) (use-modules (ice-9 popen)))
+(use-modules (ice-9 textual-ports) (json parser))
+
+; We use Python to convert the data yamls like the authors.yml to json, that we can parse in scheme.
+; Windows does not like Pipes, so we use a tmpfile instead.
+; Be sure you have PyYAML installed. On Windows that could be done for example like "py -m pip install PyYAML"
+(define (yml-file->scm filename)
+  (if windows?
+    (let* ((port (make-tmpfile #f))
+            (tmpfilepath (port-filename port))
+            (ignore (close-port port))
+            (python_code (string-append "import sys, yaml, json; f = open(r'" tmpfilepath "', 'w'); f.write(json.dumps(yaml.safe_load(open(r'" filename "')))); f.close()"))
+            (status (system (string-append (search-executable '("python3" "python" "py")) " -X utf8 -c \"" python_code "\"")))
+            (readport (open-file tmpfilepath "r" #:encoding "UTF-8"))
+            (json (get-string-all readport)))
+      (close-port readport)
+      (delete-file tmpfilepath)
+      (json-string->scm (if (status:exit-val status) json "{}")))
+    (let* ((python_code (string-append "import sys, yaml, json; print(json.dumps(yaml.safe_load(open(r'" filename "'))))"))
+            (pipe (open-pipe (string-append "PYTHONHOME='' " (search-executable '("python3" "python" "py")) " -X utf8 -c \"" python_code "\"") OPEN_READ))
+            (json (get-string-all pipe)))
+      (close-pipe pipe)
+      (json-string->scm json))))
+
+(define (parse-yml-file filename) (resolve-inherits (yml-file->scm filename)))

snippet_include.ly

@@ -0,0 +1,5 @@
+#(ly:set-option 'relative-includes #t)
+
+#(define noDefaultOutput (if (defined? 'noDefaultOutput) noDefaultOutput #f))
+
+\include #(if noDefaultOutput "void.ly" "all_base_includes.ly")

standalone_output.ly

@@ -1,39 +1,60 @@
 % set the speed of the midi music
 #(define midiQuarterNoteSpeed (if (defined? 'midiQuarterNoteSpeed) midiQuarterNoteSpeed 90))
 
-MUSIC = { \transposable \MUSIC }
+MUSIC = { \transposable #TRANSPOSITION \MUSIC }
 
-% nur Output wenn noStandaloneOutput auf false steht
+verselayout = \layout {
-output = #(if (not noStandaloneOutput)
+  \LAYOUT
-#{
+  \context {
-  \bookpart {
+    \ChordNames
-    \HEADER
+    \override ChordName.font-size = \songTextChordFontSize
+  }
+}
 
+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)
+  \override #`(verse-chords . ,#{ \chords { \verseChords } #})
+  \override #`(verse-reference-voice . ,#{ \global \firstVoice  #})
+  \TEXT
+}
+
+#(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))
+  )
+  (add-score #{
     \score {
       \MUSIC
       \layout { \LAYOUT }
-    }
+    }#})
-
+  (add-score TEXT)
-    \TEXT
+  (add-score #{
-
     \score {
       \unfoldRepeats { \MUSIC \INLINESCOREMUSIC }
       \midi {
         \context {
           \Score
           % Tempo des midi files
-          tempoWholesPerMinute = #(ly:make-moment midiQuarterNoteSpeed 4)
+          tempoWholesPerMinute = #(/ midiQuarterNoteSpeed 4)
+        }
+        \context {
+          \Staff
+          \remove "Staff_performer"
+        }
+        \context {
+          \Voice
+          \consists "Staff_performer"
         }
       }
-    }
+    }#})
-
+))
-
-  }
-#}
-)
-
-% if we don't want a standalone output, cause we compile a book, we just have an empty output here,
-% so lilypond does not generate output for this song
-\book {
-  \bookpart { \output }
-}

styles.ly

@@ -5,7 +5,7 @@
 
 #(define songStyle
   (if (not (defined? 'songStyle))
-      (if (not (defined? 'defaultSongStyle)) 'börnel defaultSongStyle)
+      (if (not (defined? 'defaultSongStyle)) 'default defaultSongStyle)
       songStyle))
 
 #(if (not (boolean? bookStyle))

styles/bock.ly

@@ -1,15 +0,0 @@
-songFormatAndSize = "a6landscape"
-songMargin = 8
-songInfoFontSize = -1.5
-songTitleFont = "Britannic T. custom"
-songChordFont = "TimesNewRomanPS"
-songLyricFont = "Arial"
-songChordFontSeries = #'normal
-songTextChordAlignment = #'left
-songScoreChordFontSize = 3
-songTextChordFontSize = 2
-songTextLineHeigth = 5.5
-songInfoPoetAndComposerStacked = ##f
-songTocColumns = 3
-globalSize = 15
-lyricSize = 1.6

styles/börnel.ly

@@ -1,15 +0,0 @@
-songFormatAndSize = "b6landscape"
-songMargin = 5
-songInfoFontSize = -3.5
-songTitleFont = "Oregano"
-songChordFont = "TeX Gyre Heros"
-songLyricFont = "Liberation Sans"
-songChordFontSeries = #'bold
-songTextChordAlignment = #'center
-songScoreChordFontSize = 0
-songTextChordFontSize = \songScoreChordFontSize
-songTextLineHeigth = 5
-songInfoPoetAndComposerStacked = ##f
-songTocColumns = 3
-globalSize = 15
-lyricSize = 1.6

styles/büdel.ly

@@ -1,15 +0,0 @@
-songFormatAndSize = "a5"
-songMargin = 5
-songInfoFontSize = 0
-songTitleFont = "Fontin Bold"
-songChordFont = "Fontin"
-songLyricFont = "FontinSans"
-songChordFontSeries = #'bold
-songTextChordAlignment = #'left
-songScoreChordFontSize = 2
-songTextChordFontSize = 2
-songTextLineHeigth = 5.3
-songInfoPoetAndComposerStacked = ##t
-songTocColumns = 2
-globalSize = 14
-lyricSize = 1.6

swing_style.ly

@@ -45,4 +45,77 @@ swing = \mark \markup {
       }
     }
   }
-}
+}
+
+swingOff = \mark \markup {
+  \line \general-align #Y #DOWN {
+    \score {
+      \new Staff \with {
+        fontSize = #-2
+        \override StaffSymbol.line-count = #0
+%        \override VerticalAxisGroup.Y-extent = #'(0 . 0)
+      }
+      \relative {
+        \stemUp
+        \override Score.SpacingSpanner.common-shortest-duration = #(ly:make-moment 3 16)
+        \override Beam.positions = #'(2 . 2)
+        h'8[ h8]
+      }
+      \layout {
+        ragged-right= ##t
+        indent = 0
+        \context {
+          \Staff \remove "Clef_engraver"
+          \remove "Time_signature_engraver"
+        }
+      }
+    }
+    " ="
+    \score {
+      \new Staff \with {
+        fontSize = #-2
+        \override StaffSymbol.line-count = #0
+%        \override VerticalAxisGroup.Y-extent = #'(0 . 0)
+      }
+      \relative {
+        \stemUp
+        \override Score.SpacingSpanner.common-shortest-duration = #(ly:make-moment 3 16)
+        \override Beam.positions = #'(2 . 2)
+        h'8 [h8]
+      }
+      \layout {
+        ragged-right= ##t
+        indent = 0
+        \context {
+          \Staff
+          \remove "Clef_engraver"
+          \remove "Time_signature_engraver"
+        }
+      }
+    }
+  }
+}
+
+\include "swing.ly"
+
+swingMusic =
+#(define-music-function (parser location music) (ly:music?)
+  (define (partial-duration-length m)
+    (let ((name (ly:music-property m 'name))
+          (es (ly:music-property m 'elements))
+          (e (ly:music-property m 'element)))
+      (if (pair? es)
+        (partial-duration-length (car es))
+        (if (ly:music? e)
+          (if (and (eq? name 'ContextSpeccedMusic) (eq? (ly:music-property e 'name) 'PartialSet))
+            (ly:duration->moment (ly:music-property e 'duration))
+            (if (eq? name 'NoteEvent)
+              ZERO-MOMENT
+              (partial-duration-length e)
+            )
+          )
+          ZERO-MOMENT))))
+#{
+  \swing
+  \applySwingWithOffset 8 #'(2 1) #(partial-duration-length music) #music
+#})

title_with_category_images.ly

@@ -4,7 +4,7 @@
 \markup {
   \override #'(baseline-skip . 3.5)
   \center-column {
-    \override #`(font-name . ,songTitleFont) { \fontsize #6 \fromproperty #'header:title }
+    \override #`(font-name . ,songTitleFont) { \fontsize #songTitleSize \fromproperty #'header:title }
     \large \bold \fromproperty #'header:subtitle
     \smaller \bold \fromproperty #'header:subsubtitle
   }
@@ -35,31 +35,26 @@
            (string-tokenize (chain-assoc-get 'header:categories props ""))))
        (make-null-markup))))
 
-#(define pdf-encode
+#(define pdf-encode (@@ (lily framework-ps) pdf-encode))
-   (if (< (list-ref (ly:version) 1) 24)
-       ly:encode-string-for-pdf
-   (@@ (lily framework-ps) pdf-encode)))
 % PDF tags
 #(define-markup-command (title-to-pdf-toc layout props title) (string?)
      (ly:make-stencil
       (list 'embedded-ps
              (ly:format
-              "[/Action /GoTo /View [/Fit] /Title (~a) /OUT pdfmark" (pdf-encode title)))
+              "[/Action /GoTo /View [/XYZ -4 currentpagedevice /PageSize get 1 get 4 add null] /Title (~a) /OUT pdfmark" (pdf-encode title)))
       empty-interval empty-interval
       ;'(0 . 0) '(0 . 0)
       ))
 
 #(define-markup-command (title-with-category-images layout props right)(boolean?)
    (interpret-markup layout props
-     (let* ((title (chain-assoc-get 'header:title props #f))
+     (let* ((title (chain-assoc-get 'header:title props ""))
-            (pdfbookmark (chain-assoc-get 'header:songfilename props title)))
+            (starttext (chain-assoc-get 'header:starttext props #f))
+            (pdfbookmark (if starttext (string-append starttext " | " title) title)))
      (if title
-     ;(if (chain-assoc-get 'header:categories props #f)
        (if right
          #{\markup { \title-to-pdf-toc #pdfbookmark \fill-line \general-align #Y #UP { \null \bookTitleMarkupCustom \category-images } } #}
          #{\markup { \title-to-pdf-toc #pdfbookmark \fill-line \general-align #Y #UP { \category-images \bookTitleMarkupCustom \null } } #})
-       ;#{\markup \fill-line \general-align #Y #UP { \null \bookTitleMarkupCustom \null } #})
-      ;(make-null-markup))
       #{ \markup { " " } #})
      )))
 

toc_include.ly

@@ -114,7 +114,33 @@
    (set! category-index-items (lambda ()
           (append-map (lambda (kv) (reverse (hashq-ref category-index-hash (car kv) (list)))) category-names))))
 
+% code for author index
+#(define*-public (add-author-index-item! authorIDs markup-symbol text #:optional label) #f)
+#(define-public (author-index-items) #f)
 
+#(let ((author-index-hash (make-hash-table)))
+   (set! add-author-index-item!
+   (lambda* (authorIDs markup-symbol text #:optional (label (gensym "index")))
+     (for-each (lambda (authorID)
+            (let* ((authorsym (string->symbol authorID))
+                   (authorlist (hashq-ref author-index-hash authorsym
+                              (list (list label 'indexAuthorMarkup authorID)))))
+                (hashq-set! author-index-hash authorsym
+                  (cons (list label markup-symbol text) authorlist))
+                ))
+       authorIDs)
+       (make-music 'EventChord
+         'page-marker #t
+         'page-label label
+         'elements (list (make-music 'LabelEvent
+         'page-label label)))))
+   (set! author-index-items (lambda ()
+          (append-map cdr
+            (sort-list
+              (hash-map->list
+                (lambda (authorsym authorlist) (cons (string-downcase (symbol->string authorsym)) (reverse authorlist)))
+                author-index-hash)
+              (lambda (a b) (string-ci<? (car a) (car b))))))))
 
 
 #(define-markup-command (with-link-symbol-ref layout props symbol arg)
@@ -140,16 +166,13 @@
      (markup #:override (cons 'baseline-skip 3.5) (if catname (make-left-column-markup (string-split (cadr catname) #\newline)) category)))))
 
 #(define-markup-command (index-item-with-pattern layout props)()
-     (let (
+    (let* (
             (text (chain-assoc-get 'index:text props))
             (page (chain-assoc-get 'index:page props))
             (width (-
                      (chain-assoc-get 'line-width props)
                      (interval-length (ly:stencil-extent (interpret-markup layout props "XXXX") X))))
-            )
+            (lines-reversed
-     (interpret-markup layout props
-       (make-column-markup
-         (let ((revlist
                 (if (markup? text)
                     (list text)
                     (reverse (map (lambda (stil) (markup #:stencil stil))
@@ -158,20 +181,28 @@
                                 (list (cons 'line-width width) (cons 'font-shape 'italic))
                                 (list (cons 'line-width width))) props) #f
                         (chain-assoc-get 'rawtext text))))))
-               (target-size-markup
+            (last-line-with-dots (make-fill-with-pattern-markup 1 RIGHT "." (car lines-reversed) page))
+            (lines-without-dots (cdr lines-reversed))
+            (target-line-size-markup
                  (make-column-markup
                    (list
                     (make-simple-markup "Agj")
                     (make-vspace-markup 0.2))))
-               )
+            )
-               (reverse (map (lambda (m)
+      (interpret-markup layout props
-                               (make-size-box-to-box-markup #f #t m target-size-markup))
+        (make-size-box-to-box-markup #f #t
-                          (cons
+          (make-with-link-symbol-ref-markup 'index:label
-                           (make-fill-with-pattern-markup 1 RIGHT "." (car revlist) page)
+            (make-column-markup
-                           (cdr revlist)))))))))
+              (reverse (cons
+                          last-line-with-dots
+                          (map (lambda (m) (make-size-box-to-box-markup #f #t m target-line-size-markup)) lines-without-dots)))))
+          ; this column is just to have a reference height for resizing
+          (make-column-markup
+            (reverse (map (lambda (m) (make-size-box-to-box-markup #f #t m target-line-size-markup)) (cons last-line-with-dots lines-without-dots))))
+                          ))))
 
 \paper {
-  indexItemMarkup = \markup \with-link-symbol-ref #'index:label {
+  indexItemMarkup = \markup {
     \index-item-with-pattern
   }
   indexSectionMarkup = \markup \override #'(baseline-skip . 1.5) \left-column {
@@ -182,7 +213,16 @@
     \fill-line { \line { \vcenter \category-image-symbol-ref #7 #'index:text \hspace #3 \vcenter \sans \bold \fontsize #3 \category-name-symbol-ref #'index:text } \null }
     \vspace #.4
   }
-
+  indexAuthorMarkup = \markup \override #'(baseline-skip . 1.5) \left-column {
+    \vspace #1
+    \sans \bold \fontsize #3
+      #(make-on-the-fly-markup
+        (lambda (layout props m)
+          (interpret-markup layout props
+            (make-justify-string-markup (format-author (ly:output-def-lookup layout 'authorFormat) (chain-assoc-get 'index:text props #f) #t))))
+        (make-null-markup))
+    \vspace #.4
+  }
 }
 
 #(define (prepare-item-markup items layout)
@@ -200,7 +240,8 @@
   ( _i "Outputs index alphabetical sorted or in categories" )
     (let ((items (case index-type
             ((alphabetical) index-items)
-            ((categories) category-index-items)))
+            ((categories) category-index-items)
+            ((authors) author-index-items)))
           (title (interpret-markup layout props title-markup)))
       (cons title
       (interpret-markup-list layout props
@@ -219,29 +260,172 @@ indexSection =
    "Add a section line to the alphabetical index, using @code{indexSectionMarkup} paper variable markup. This can be used to divide the alphabetical index into different sections, for example one section for each first letter."
    (add-index-item! 'indexSectionMarkup text sorttext))
 
-#(define (extract-var-from-module module sym)
+#(define (extract-and-check-vars-from-header bookheader varlist)
-  (let ((variableref (assoc-ref module sym)))
+  (let* ((headervars (hash-map->list cons (struct-ref (ly:book-header bookheader) 0)))
-    (if variableref (variable-ref variableref) #f))
+         (extract-var-and-check (lambda (headervar)
-  )
+           (let* ((variableref (assoc-ref headervars headervar))
+                  (extracted (if variableref (variable-ref variableref) #f)))
+              (if (and extracted (not (and (string? extracted) (string-null? extracted)))) extracted #f)))))
+    (map (lambda (varsymbol)
+      (cons varsymbol (extract-var-and-check varsymbol))
+    ) varlist)))
 
 headerToTOC = #(define-music-function (parser location header label) (ly:book? symbol?)
+    (define (all-author-ids authors)
+      (let ((poetIds (find-author-ids-by 'text authors))
+            (translatorIds (find-author-ids-by 'translation authors))
+            (versePoetData (find-author-id-with-part-numbers 'verse authors))
+            (composerIds (find-author-ids-by 'melody authors))
+            (verseComposerData (find-author-id-with-part-numbers 'meloverse authors))
+            (voiceComposerData (find-author-id-with-part-numbers 'voice authors))
+            (compositionIds (find-author-ids-by 'composition authors))
+            (bridgeIds (find-author-ids-by 'bridge authors))
+            (interludeIds (find-author-ids-by 'interlude authors)))
+        (delete-duplicates
+          (append poetIds translatorIds (map car versePoetData) composerIds (map car verseComposerData) (map car voiceComposerData) compositionIds bridgeIds interludeIds))
+    ))
     (let*
       (
-       (headervars (hash-map->list cons (struct-ref (ly:book-header header) 0)))
+       (extractedheadervars (extract-and-check-vars-from-header header '(title starttext alttitle categorytitle categories authors)))
-       (extract-var-and-check (lambda (headervar) (let
+       (title (assq-ref extractedheadervars 'title))
-                                                   ((extracted (extract-var-from-module headervars headervar)))
+       (starttext (assq-ref extractedheadervars 'starttext))
-                                                   (if (and extracted (not (string-null? extracted))) extracted #f)
+       (alttitle (assq-ref extractedheadervars 'alttitle))
-                                                    )))
+       (categorytitle (assq-ref extractedheadervars 'categorytitle))
-       (title (extract-var-and-check 'title))
+       (categories (assq-ref extractedheadervars 'categories))
-       (alttitle (extract-var-and-check 'alttitle))
+       (authors (assq-ref extractedheadervars 'authors))
-       (altalttitle (extract-var-and-check 'altalttitle))
-       (categorytitle (extract-var-and-check 'categorytitle))
-       (categories (extract-var-and-check 'categories))
        (add-to-toc! (lambda (toctitle tocmarkup)
                       (add-index-item! 'indexItemMarkup tocmarkup toctitle label)))
        )
            (if categories (add-category-index-item! (string-tokenize categories) 'indexItemMarkup (cons (list (cons 'rawtext (if categorytitle categorytitle title))) '()) label))
-           (if alttitle (add-to-toc! alttitle (cons (list (cons 'rawtext alttitle) (cons 'alternative #t)) '())))
+           (if authors (add-author-index-item! (all-author-ids authors) 'indexItemMarkup (cons (list (cons 'rawtext (if categorytitle categorytitle title))) '()) label))
-           (if altalttitle (add-to-toc! altalttitle (cons (list (cons 'rawtext altalttitle) (cons 'alternative #t)) '())))
+           (if starttext (add-to-toc! starttext (cons (list (cons 'rawtext starttext) (cons 'alternative #t)) '())))
+           (if alttitle
+               (if (list? alttitle)
+                   (for-each (lambda (alt)
+                                (add-to-toc! alt (cons (list (cons 'rawtext alt) (cons 'alternative #t)) '())))
+                             alttitle)
+                   (add-to-toc! alttitle (cons (list (cons 'rawtext alttitle) (cons 'alternative #t)) '()))))
            (if title (add-to-toc! title (cons (list (cons 'rawtext title)) '())) #{ #})
     ))
+
+
+%% https://github.com/NalaGinrut/guile-csv/blob/master/csv/csv.scm
+
+#(define* (sxml->csv sxml port #:key (delimiter #\,))
+  (let* ((d (string delimiter))
+         (csv (map (lambda (l) (string-join l d)) sxml)))
+    (for-each (lambda (l)
+                (format port "~a~%" l))
+              csv)))
+
+#(define csv-write sxml->csv)
+
+#(define-markup-command (write-toc-csv layout props) ()
+  (define (csv-escape field)
+    (if (string-null? field)
+        field
+        (string-append
+          "\""
+          (ly:string-substitute "\n" "\\n"
+            (ly:string-substitute "\"" "\\\"" field))
+          "\"")))
+  (define (format-authors authorIds)
+    (string-join (map (lambda (authorId) (format-author (ly:output-def-lookup layout 'authorFormat) authorId #f)) authorIds) ", "))
+  (define cr-regex (ly:make-regex "\r"))
+  (define crlf-regex (ly:make-regex "\r\n"))
+  (define para-sep-regex (ly:make-regex "\n[ \t\n]*\n[ \t\n]*"))
+  (define whitespace-regex (ly:make-regex "[ \t\n]+"))
+  (define leading-whitespace-regex (ly:make-regex "^[ \t\n]+"))
+  (define trailing-whitespace-regex (ly:make-regex "[ \t\n]+$"))
+  (define (cleanup-whitespaces str)
+    (ly:regex-replace leading-whitespace-regex
+      (ly:regex-replace trailing-whitespace-regex
+        (ly:regex-replace whitespace-regex str " ")
+        "")
+      ""))
+  (define (format-info-paragraphs text)
+    (let* ((para-strings (ly:regex-split
+                        para-sep-regex
+                        (ly:regex-replace
+                         cr-regex
+                         (ly:regex-replace crlf-regex text "\n")
+                         "\n")))
+         (para-lines (map cleanup-whitespaces para-strings)))
+    (string-join para-lines "\n")))
+  (define (generate-toc-csv labelPageTable)
+    (let ((song-lines (map (lambda (song)
+            (let* ((filename (symbol->string (car song)))
+                   (songvars (cdr song))
+                   (page-number (number->string (assoc-get (assq-ref songvars 'label) labelPageTable)))
+                   (extractedheadervars (extract-and-check-vars-from-header (assq-ref songvars 'header)
+                      '(title starttext alttitle categorytitle categories authors year_text year_melody year_translation year_composition infotext translation pronunciation copyright source)))
+                   (headervar-or-empty (lambda (varsym)
+                     (let ((extracted (assq-ref extractedheadervars varsym)))
+                       (if extracted extracted ""))))
+                   (authors (assq-ref extractedheadervars 'authors))
+                   (poetIds (find-author-ids-by 'text authors))
+                   (translatorIds (find-author-ids-by 'translation authors))
+                   (versePoetData (find-author-id-with-part-numbers 'verse authors))
+                   (composerIds (find-author-ids-by 'melody authors))
+                   (verseComposerData (find-author-id-with-part-numbers 'meloverse authors))
+                   (voiceComposerData (find-author-id-with-part-numbers 'voice authors))
+                   (compositionIds (find-author-ids-by 'composition authors))
+                   (bridgeIds (find-author-ids-by 'bridge authors))
+                   (interludeIds (find-author-ids-by 'interlude authors)))
+              (map csv-escape
+                (list
+                  filename
+                  page-number
+                  (headervar-or-empty 'title)
+                  (headervar-or-empty 'starttext)
+                  (let ((alttitle-value (headervar-or-empty 'alttitle)))
+                    (if (list? alttitle-value)
+                        (string-join alttitle-value ", ")  ; Wenn eine Liste, dann zusammenfügen
+                        alttitle-value))  ; Wenn kein Liste, den originalen Wert verwenden
+
+                  (headervar-or-empty 'categorytitle)
+                  (headervar-or-empty 'categories)
+                  (format-authors (append poetIds (map car versePoetData)))
+                  (format-authors translatorIds)
+                  (format-authors (append composerIds compositionIds bridgeIds interludeIds (map car voiceComposerData) (map car verseComposerData)))
+                  (headervar-or-empty 'year_text)
+                  (headervar-or-empty 'year_melody)
+                  (headervar-or-empty 'year_translation)
+                  (headervar-or-empty 'year_composition)
+                  (headervar-or-empty 'copyright)
+                  (headervar-or-empty 'source)
+                  (format-info-paragraphs (headervar-or-empty 'infotext))
+                  (format-info-paragraphs (headervar-or-empty 'translation))
+                  (format-info-paragraphs (headervar-or-empty 'pronunciation))
+              ))))
+            (alist-delete 'imagePage (alist-delete 'emptyPage song-list)))))
+    (call-with-output-file "toc.csv"
+      (lambda (port)
+       (csv-write (cons '(
+        "filename"
+        "page-number"
+        "title"
+        "starttext"
+        "alttitle"
+        "categorytitle"
+        "categories"
+        "poets"
+        "translators"
+        "composers"
+        "year_text"
+        "year_melody"
+        "year_translation"
+        "year_composition"
+        "copyright"
+        "source"
+        "infotext"
+        "translation"
+        "pronunciation"
+        ) song-lines) port))
+  )))
+  ; we use a delayed stencil to have all the page references available
+  (ly:make-stencil
+    `(delay-stencil-evaluation
+      ,(delay (let* ((table (ly:output-def-lookup layout 'label-page-table)))
+        (generate-toc-csv (if (list? table) table '()))
+        empty-stencil)))))

transposition.ly

@@ -1,13 +1,22 @@
-TRANSPOSITION = ##f
+TRANSPOSITION = #(cons #f #f)
 
 transposeGlobal =
 #(define-void-function (from to) (ly:pitch? ly:pitch?)
    (set! TRANSPOSITION (cons from to)))
 
 transposable =
-#(define-music-function (music) (ly:music?)
+#(define-music-function (fromto music) (pair? ly:music?)
-  (if TRANSPOSITION
+  (if (car fromto)
     #{
-      \transpose #(car TRANSPOSITION) #(cdr TRANSPOSITION) #music
+      \transpose #(car fromto) #(cdr fromto) #music
     #}
     music))
+
+% Akkorde in Strophen transponieren
+#(define-markup-list-command (transpose layout props from to markuplist)
+  (markup? markup? markup-list?)
+
+  (define (markup->pitch m)
+    (ly:assoc-get (string->symbol (markup->string m)) pitchnames))
+
+  (interpret-markup-list layout (prepend-alist-chain 'transposition (cons (markup->pitch from) (markup->pitch to)) props) markuplist))

verses_with_chords.ly

@@ -5,7 +5,7 @@
      #{ \markup { \column {
      $(let ((verse-markup-string (
         string-append "\\line { "
-          (ly:regex-replace (ly:make-regex "\n") text " } \\line { ")
+          (ly:regex-replace (ly:make-regex "\r?\n") text " } \\line { ")
           " \\size-box-to-box ##f ##t \"\" \"Agj\" }" )))
        (ly:parser-include-string verse-markup-string))
      }}#}
@@ -52,11 +52,6 @@
      ((center) (make-size-box-to-box-markup use-x use-y abox bbox))
      ((left) (make-size-box-to-box-left-aligned-markup use-x use-y abox bbox)))))
 
-% Akkorde in Strophen transponieren
-#(define-markup-list-command (transpose layout props from to markuplist)
-  (markup? markup? markup-list?)
-  (interpret-markup-list layout (prepend-alist-chain 'transposition (cons from to) props) markuplist))
-
 #(define-markup-command (chord-alignment-style-dependent layout props chord-with-text) (markup?)
    (interpret-markup layout props
    (case songTextChordAlignment
@@ -66,17 +61,18 @@
 % Text über Text mittig darstellen
 #(define-markup-command (textup layout props text uptext) (markup? markup?)
    "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 { \generalLayout } }
+           \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?)
@@ -87,52 +83,92 @@
      ))
 
 #(define-markup-command (stanza-raw layout props arg)
-   (markup?)
+   (string-or-music?)
+   (let ((verselayout (chain-assoc-get 'verselayout props generalLayout)))
    (interpret-markup layout props
      (if (and (string? arg) (string-null? arg))
          " "
          #{\markup
-           \score { \new Lyrics { \lyricmode { \set stanza = #arg "" } } \layout { \generalLayout } }
+           \score { \new Lyrics { \lyricmode { #(if (ly:music? arg) arg #{ \set stanza = #arg #}) "" } } \layout { \verselayout } }
          #}
-     )))
+     ))))
 
 #(define-markup-command (stanza layout props arg)
-   (markup?)
+   (string-or-music?)
    (interpret-markup layout props
      (make-size-box-to-box-markup #f #t (make-stanza-raw-markup arg) (make-stanza-raw-markup "x"))))
 
+#(define (handle-custom-newlines custom-verse-breaks text)
+  (if (null? custom-verse-breaks)
+    text
+    (let make-custom-linebreaks
+      ((break-words custom-verse-breaks)
+       (newtext (ly:regex-replace (ly:make-regex "\r?\n") text " ")))
+      (if (null? break-words)
+          newtext
+          (make-custom-linebreaks
+            (cdr break-words)
+            (ly:regex-replace
+              (ly:make-regex
+                (string-append
+                  "("
+                  (string-concatenate
+                    (map
+                      (lambda (character)
+                        (let ((escaped_char (ly:regex-quote (string character))))
+                             (string-append "(?: *,[^,)]+\\)" escaped_char "|\\(?" escaped_char ")")))
+                      (string->list (car break-words))))
+                  "(?: *,[^,)]+\\))?)(.*)$"))
+              newtext
+              1 "\n" 2))))))
+
+#(use-modules (lily display-lily))
+
 % Kompletten Vers mit Akkorden
-#(define-markup-command (chordverse layout props stanza verse) (markup? string?)
+#(define-markup-command (chordverse layout props stanza verse) (string-or-music? string?)
-   #:properties ((intraverse-vspace 0))
+   #:properties (
+    (intraverse-vspace 0)
+    (custom-verse-breaks '())
+    (transposition (cons #f #f))
+    (verselayout generalLayout)
+    )
    "Vers mit Akkorden"
-   (let* ((fromto (chain-assoc-get 'transposition props #f))
+   (let ((transp (if (car transposition)
-          (transp (if fromto
+                    (string-append "\\transpose " (symbol->string (note-name->lily-string (car transposition))) " " (symbol->string (note-name->lily-string (cdr transposition))))
-                    (string-append "\\transpose " (car fromto) " " (cdr fromto))
                     "")))
    (interpret-markup layout props
      (markup #:override `(baseline-skip . ,(+ intraverse-vspace songTextLineHeigth)) #:anchor-x-between #:stanza stanza
        (make-wrap-newline-markup
                (ly:regex-replace (ly:make-regex "\\(( *)([^,()]*)( *),([^)]*)\\)")
-                 (ly:regex-replace (ly:make-regex "(([^ \n]*\\([^()]*,[^()]+\\)[^ \n(]*)+)") verse " \\concat { " 1 " } ")
+                 (ly:regex-replace (ly:make-regex "(([^ \n]*\\([^()]*,[^()]+\\)[^ \n(]*)+)") (handle-custom-newlines custom-verse-breaks verse) " \\concat { " 1 " } ")
-                "\\textup \\line { \"" 1 "\" " 2 " \"" 3 "\" } \\score { \\transposable " transp " \\chords { s4 " 4 " } \\layout { \\verseChordLayout } }")
+                "\\textup \\line { \"" 1 "\" " 2 " \"" 3 "\" } \\score { " transp " \\chords { s4 " 4 " } \\layout { \\verselayout } }")
                 )
      ))))
 
 % Kompletter Vers aus dem Akkorde entfernt werden
-#(define-markup-command (nochordverse layout props stanza verse) (markup? string?)
+#(define-markup-command (nochordverse layout props stanza verse) (string-or-music? string?)
-   #:properties ((intraverse-vspace 0))
+   #:properties ((intraverse-vspace 0)(custom-verse-breaks '()))
    "Vers ohne Akkorde"
    (interpret-markup layout props
      (markup #:override `(baseline-skip . ,(+ intraverse-vspace 3.0)) #:anchor-x-between #:stanza stanza
-           #:wrap-newline (ly:regex-replace (ly:make-regex "\\(([^,]*),([^)]*)\\)") verse 1)
+           #:wrap-newline (ly:regex-replace (ly:make-regex "\\(([^,]*),([^)]*)\\)") (handle-custom-newlines custom-verse-breaks verse) 1)
      )
    )
 )
 
 #(define-markup-command (verseformat layout props verse) (markup?)
+   #:properties ((verselayout generalLayout))
    "Textformatierung für Strophen"
    (interpret-markup layout props
-       (make-sans-markup (make-fontsize-markup (ly:output-def-lookup layout 'lyric-size) verse))
+     (let* (
+         (layout-scale (ly:output-def-lookup layout 'output-scale 1.0))
+         (verselayout-scale (ly:output-def-lookup verselayout 'output-scale layout-scale))
+         (mag-scale (/ verselayout-scale layout-scale))
+         (lyric-context-props (ly:context-def-lookup (ly:assoc-get 'Lyrics (ly:output-find-context-def verselayout 'Lyrics)) 'property-ops))
+         (lyric-size (caddr (find (lambda (prop) (and (equal? 'push (car prop)) (equal? 'LyricText (cadr prop)) (equal? 'font-size (cadddr prop)))) lyric-context-props)))
+       )
+       (make-magnify-markup mag-scale (make-sans-markup (make-fontsize-markup lyric-size verse)))
+     )
    )
 )
 
@@ -163,4 +199,140 @@
           (map (lambda (column-markups)
               (make-column-markup
                 (add-markup-between-elements #t (make-vspace-markup verse-vspace) column-markups)))
-            column-data)))))))))
+            column-data)))))))))
+
+#(define-markup-command (pad-left layout props amount arg)
+  (number? markup?)
+  (let* ((m (interpret-markup layout props arg))
+         (x (ly:stencil-extent m X))
+         (y (ly:stencil-extent m Y)))
+    (ly:stencil-translate
+      (ly:make-stencil (ly:stencil-expr m)
+                       (cons (- (car x) amount) (cdr x))
+                       y)
+      `(,amount . 0))))
+
+#(define-markup-command (pad-right layout props amount arg)
+  (number? markup?)
+  (let* ((m (interpret-markup layout props arg))
+         (x (ly:stencil-extent m X))
+         (y (ly:stencil-extent m Y)))
+      (ly:make-stencil (ly:stencil-expr m)
+                       (cons (car x) (+ (cdr x) amount))
+                       y)))
+
+#(define-markup-command (score-equal-height layout props reference-height lines)
+  (number? markup-list?)
+  #:category music
+  #:properties ((baseline-skip))
+    (stack-stencils Y DOWN baseline-skip
+      (map
+        (lambda (line) (ly:make-stencil (ly:stencil-expr line) (ly:stencil-extent line X) `(,(/ reference-height -2.0) . ,(/ reference-height 2.0))))
+        (interpret-markup-list layout props lines))))
+
+#(define-public (custom-lyric-text::print grob)
+  "Allow interpretation of tildes as lyric tieing marks."
+  ;; See also similar code in Lyric_performer.
+  (let ((text (ly:grob-property grob 'text)))
+
+    (grob-interpret-markup grob (if (string? text)
+                                    (make-pad-right-markup -0.1 (make-tied-lyric-markup text))
+                                    text))))
+
+#(define-markup-command (chordlyrics layout props lyrics) (ly:music?)
+   #:properties ((verse-chords #{#})
+                 (verse-reference-voice #{#})
+                 (verse-break-voice #{#})
+                 (verse-line-height songTextLineHeigth)
+                 (verse-text-chord-distance songTextChordDistance)
+                 (intraverse-vspace 0)
+                 (transposition (cons #f #f))
+                 (verselayout generalLayout))
+  "Vers mit Akkorden"
+  (interpret-markup layout props
+    #{
+      \markup {
+        \override #`(baseline-skip . ,intraverse-vspace)
+        \score-equal-height #verse-line-height \score-lines {
+          <<
+            \new Devnull { #verse-break-voice }
+            \new NullVoice = "dummyvoice" { #verse-reference-voice }
+            \transposable #transposition #(music-clone verse-chords)
+            \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)))
+            ragged-right = ##t
+            \context {
+              \Lyrics
+              \override VerticalAxisGroup.nonstaff-relatedstaff-spacing.basic-distance = #verse-text-chord-distance
+              \override LyricText.parent-alignment-X = #LEFT
+              \override LyricText.self-alignment-X = #LEFT
+              \override LyricText.word-space = 0.8
+              \override LyricSpace.minimum-distance = 0.8
+              \override LyricText.stencil = #custom-lyric-text::print
+            }
+            \context {
+              \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
+              \override PaperColumn.keep-inside-line = ##f
+             % \override SpacingSpanner.strict-note-spacing = ##t
+              \override SpacingSpanner.uniform-stretching = ##t
+              \override SpacingSpanner.spacing-increment = 0
+              \remove Bar_number_engraver
+              \remove Mark_engraver
+              \remove Jump_engraver
+              \remove Volta_engraver
+              \remove Parenthesis_engraver
+            }
+            \context {
+              \Staff
+              \remove Staff_symbol_engraver
+              \remove Clef_engraver
+              \remove Time_signature_engraver
+              \remove Bar_engraver
+              \remove Separating_line_group_engraver
+              \omit KeySignature
+              \omit KeyCancellation
+            }
+            \context {
+              \Voice
+              \remove Stem_engraver
+              \remove Rest_engraver
+              \remove Multi_measure_rest_engraver
+              \remove Phrasing_slur_engraver
+              \remove Slur_engraver
+              \remove Tie_engraver
+              \remove Dynamic_engraver
+              \remove Note_heads_engraver
+            }
+            \context {
+              \NullVoice
+              \consists Rest_engraver
+              \omit Rest
+             % \undo \omit NoteHead
+             % \hide NoteHead
+            }
+          }
+        }
+      }
+    #}
+  )
+)
+
+#(define-markup-command (nochordlyrics layout props lyrics) (ly:music?)
+    "Vers ohne Akkorde"
+  (interpret-markup layout props
+    (markup
+      #:override `(verse-chords . ,#{#})
+      #:override `(verse-line-height . ,(- songTextLineHeigth 2))
+      #:chordlyrics lyrics))
+)