utils: color validation, allow rgba colors

Author: Cube707

src/badges/_html_colors.py

@@ -4,7 +4,7 @@
 from re import compile
 
 
-RE_HEX_COLOR = compile(r"^#([0-9a-fA-F]{3}){1,2}$")
+RE_HEX_COLOR = compile(r"#([0-9a-fA-F]{3}){1,2}|#[0-9a-fA-F]{8}")
 
 # this code is directly taken from the `colour` package
 # see https://github.com/vaab/colour/blob/11f138eb7841d2045160b378a2eec0c2321144c0/colour.py#L52-L199

tests/utils/test_check_html_color.py

@@ -6,13 +6,20 @@
 @pytest.mark.parametrize(
     ("color", "expected"),
     [
-        ("#", False),
-        ("red", True),
-        ("Red", False),
         ("#f00", True),
-        ("#f0", False),
         ("#ff0000", True),
+        ("#ff0000ff", True),
+        ("#", False),
+        ("#f0", False),
+        ("#f00f", False),
+        ("#f00f0", False),
         ("#ff0000f", False),
+        ("#ff0000ff0", False),
+        ("#ff0000ff00", False),
+        ("red", True),
+        ("Red", False),
+        ("re", False),
+        ("rede", False),
         ("green slime", False),
     ],
 )