Rendering code refactor

folkugat_web/assets/templates/lilypond/single_tune.ly

@@ -0,0 +1,55 @@
+\version "2.24.4"
+\paper {
+  top-margin = 10
+  left-margin = 15
+  right-margin = 15
+}
+
+\header {
+  title = \markup { "{{ tune.header.title | safe }}" }
+  {% if tune.header.composer %}
+  composer = "{{ tune.header.composer | safe }}"
+  {% endif %}
+
+  tagline = "Partitura generada amb LilyPond"
+  copyright = "Folkugat"
+}
+
+\markup \vspace #2
+
+{% if tune.score_source is not none %}
+\score {
+  \language "english"
+  <<
+{{ score_beginning }}
+{{ tune.score_source | safe }}
+  >>
+}
+{% endif %}
+{% if tune.lyrics is not none %}
+{% for line in tune.lyrics.lines %}
+\markup {
+  \vspace #2
+  \fill-line {
+    {% for paragraph in line.paragraphs %}
+    \hspace #1
+    \center-column {
+        {% for line in paragraph.lines %}
+        \line { {{ line | safe }} }
+        {% endfor %}
+    }
+    {% endfor %}
+    \hspace #1
+  }
+}
+{% if loop.index < tune.lyrics.lines|length %}
+\markup {
+  \vspace #1
+  \fill-line {
+    \override #'(span-factor . 4/9)
+    \draw-hline
+  }
+}
+{% endif %}
+{% endfor %}
+{% endif %}