feat: crappy reordering

utils/list_utils.py

@@ -7,5 +7,26 @@ def compile_query_to_plain_sql(query) -> str:
     return query.compile(compile_kwargs={
         'literal_binds': True
     })
+
+
 def to_locale_number(value):
-    return  '{:,}'.format(value).replace(',', ' ')
+    return '{:,}'.format(value).replace(',', ' ')
+
+
+def previous_current_next(iterable):
+    """Make an iterator that yields a (previous, current, next) tuple per element.
+
+    Returns None if the value does not make sense (i.e. previous before
+    first and next after last).
+    """
+    iterable = iter(iterable)
+    prv = None
+    cur = next(iterable)
+    try:
+        while True:
+            nxt = next(iterable)
+            yield prv, cur, nxt
+            prv = cur
+            cur = nxt
+    except StopIteration:
+        yield prv, cur, None