euscan: last_version property added

Signed-off-by: volpino <fox91@anche.no>

TODO

@@ -79,8 +79,6 @@ Move log models into djeuscanhistory ?
 - Url ad ManyToMany
 - Arches and Keyword
 - Metadata, herds, maintainers and homepage are per-version, not per package. Store it in Version instead.
-  Define last_version that refers to the last version (can be last_version_gentoo or last_version_overlay)
-  Fix update_counter, to update this field.
 
 ### djportage (LOW-PRIORITY))
 

euscanwww/djeuscan/models.py

@@ -116,6 +116,20 @@ class Package(models.Model):
     def homepages(self):
         return self.homepage.split(' ')
 
+    @property
+    def last_version(self):
+        from euscan.helpers import vercmp
+
+        versions = [
+            self.last_version_gentoo,
+            self.last_version_overlay,
+            self.last_version_upstream
+        ]
+        _cmp = lambda x, y: vercmp(
+            unicode(self), x.version if x else "", y.version if y else ""
+        )
+        return sorted(versions, cmp=_cmp)[-1]
+
 
 class Version(models.Model):
     """