be able to format everything of the songinfo with markup

private_includes/base/default_songinfo_style.ily

@@ -44,6 +44,8 @@
               (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
@@ -52,20 +54,16 @@
                         (make-wordwrap-internal-markup-list #t
                           #{ \markuplist { $(ly:parser-include-string paragraph) } #}))
                       (ly:regex-split (ly:make-regex "\n[ \t\n]*\n[ \t\n]*") (string-append prefix text))))
-                  '())))
-              (poet-and-composer-markup-list
-                (string-with-paragraphs->markuplist "" (string-append
-                  (if poet-with-year (string-append "\n\n" poet-with-year) "")
-                  (if composer-with-year (string-append "\n\n" composer-with-year) "")
-                )))
-              (poet-and-composer-oneliner (if (and poet-with-year composer-with-year) (make-line-markup (cons (cadr poet-and-composer-markup-list) (cons between-poet-and-composer-markup (cddr poet-and-composer-markup-list)))) #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)
-                  poet-and-composer-markup-list)
+                  (string-with-paragraphs->markuplist "" poet-and-composer-oneliner)
+                  (string-with-paragraphs->markuplist "" (string-append
+                    (if poet-with-year (string-append "\n\n" poet-with-year) "")
+                    (if composer-with-year (string-append "\n\n" composer-with-year) "")
+                  )))
                 (string-with-paragraphs->markuplist "" (string-append
                   (if copyright (string-append "\n\n© " copyright) "")))
                 (string-with-paragraphs->markuplist "" infotext)