avoid existing quotes

qreu/address.py

@@ -69,7 +69,9 @@ def normalize_display_address(addr_string):
         email = addr_part.strip('> ').strip()
 
         if name and not (name.startswith('"') and name.endswith('"')):
-            name = '"{}"'.format(name)
+            name = name.replace('"', r'\"')
+            if any(c in name for c in [',', ';', ':']):
+                name = '"{}"'.format(name)
 
         return '{} <{}>'.format(name, email)
     return addr_string  # If no angle brackets found, return as-is

spec/address_spec.py

@@ -64,3 +64,9 @@
         addr_str = 'Admin Name admin@example.com'
         normalized = normalize_display_address(addr_str)
         expect(normalized).to(equal(addr_str))
+
+    with it('must escape internal quotes if present'):
+        addr_str = 'SAYS "YES", PEPITA <pepita@example.com>'
+        expect(normalize_display_address(addr_str)).to(equal(
+            u'"SAYS \\"YES\\", PEPITA" <pepita@example.com>'
+        ))