server/misc: add icase_unique

server/szurubooru/tests/util/test_misc.py

@@ -28,3 +28,14 @@ def test_parsing_empty_date_time():
 def test_parsing_date_time(input, output):
     misc.datetime.datetime = FakeDatetime
     assert misc.parse_time_range(input) == output
+
+@pytest.mark.parametrize('input,output', [
+    ([], []),
+    (['a', 'b', 'c'], ['a', 'b', 'c']),
+    (['a', 'b', 'a'], ['a', 'b']),
+    (['a', 'a', 'b'], ['a', 'b']),
+    (['a', 'A', 'b'], ['a', 'b']),
+    (['a', 'A', 'b', 'B'], ['a', 'b']),
+])
+def test_icase_unique(input, output):
+    assert misc.icase_unique(input) == output

server/szurubooru/util/misc.py

@@ -61,3 +61,12 @@ def parse_time_range(value, timezone=datetime.timezone(datetime.timedelta())):
             datetime.datetime(year, month, day + 1) - one_second)
 
     raise ValidationError('Invalid date format: %r.' % value)
+
+def icase_unique(source):
+    target = []
+    target_low = []
+    for source_item in source:
+        if source_item.lower() not in target_low:
+            target.append(source_item)
+            target_low.append(source_item.lower())
+    return target