lilypond-common-includes/default_songinfo_style.ly

\paper {
  poetPrefix = "Worte:"
  composerPrefix = "Weise:"
  compositionPrefix = "Satz:"
  poetAndComposerEqualPrefix = "Worte und Weise:"

  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))))
          (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) "")
                  (if infotext (string-append "\n\n" infotext) "")
                  (if translation (string-append "\n\nÜbersetzung: " translation) "")
                  (if pronunciation (string-append "\n\nAussprache: " pronunciation) ""))))))))
      (make-null-markup)
    )
}