[WIP] Detect verses not containing any lyrics.

They are not rendered correctly yet.

Discussed in #87

patacrep/songs/chordpro/ast.py

@@ -168,6 +168,15 @@ class Verse(AST):
         self.lines.insert(0, data)
         return self
 
+    @property
+    def nolyrics(self):
+        """Return `True` iff verse contains only notes (no lyrics)"""
+        for line in self.lines:
+            for item in line.line:
+                if not (isinstance(item, Space) or isinstance(item, ChordList)):
+                    return False
+        return True
+
 class Chorus(Verse):
     """Chorus"""
     type = 'chorus'

patacrep/songs/chordpro/data/latex/content_verse

@@ -1,5 +1,12 @@
+(*- if content.nolyrics -*)
+    TODO NOLYRICS
+    (* for line in content.lines *)
+        (( render(line) ))
+    (* endfor *)
+(*- else *)
 \begin{(( content.type ))}
   (* for line in content.lines *)
     (( render(line) ))
   (* endfor *)
 \end{(( content.type ))}
+(*- endif *)

test/test_chordpro/nolyrics.sgc

@@ -0,0 +1,14 @@
+{language: english}
+
+A chorus [A]with lyrics
+[Emaj3]maj et nombre
+
+
+[A B#]
+
+
+[A] [B]
+[C]
+
+
+A chorus [C]with lyrics

test/test_chordpro/nolyrics.source

@@ -0,0 +1,9 @@
+A chorus [A]with lyrics
+[Emaj3]maj et nombre
+
+[A B#]
+
+[A] [B]
+[C]
+
+A chorus [C]with lyrics

test/test_chordpro/nolyrics.tex

@@ -0,0 +1,30 @@
+\selectlanguage{english}
+
+\beginsong{}[
+  by={
+  },
+]
+
+
+\begin{verse}
+    A chorus \[A]with lyrics
+    \[Emaj3]maj et nombre
+\end{verse}
+
+
+TODO NOLYRICS
+        \[A B#]
+
+
+
+TODO NOLYRICS
+        \[A] \[B]
+        \[C]
+
+
+
+\begin{verse}
+    A chorus \[C]with lyrics
+\end{verse}
+
+\endsong