Implemented the 'nearby' template filter, which filters an entryset b…

…ased on selecting 2 objects before and 2 objects after the specified object. (For example, you could order by published date, and then get the previous two chronological and next two chronological objects.)

templatetags/lifeflow.py

@@ -18,3 +18,22 @@ def boundary(value, arg):
 
 register.filter('boundary', boundary)
 
+def nearby(lst, obj, count=5):
+    lst = list(lst)
+    l = len(lst)
+    print l
+    try:
+        pos = lst.index(obj)
+    except ValueError:
+        pos = 0
+    dist = count / 2
+    print pos
+    print dist
+    if pos <= dist:
+        return lst[:count]
+    if pos >= l - dist:
+        return lst[l-count:]
+    else:
+        return lst[pos-dist:pos+dist+1]
+
+register.filter('nearby', nearby)