feat: Add from hex method

Author: Sigmanificient

catppuccin/colour.py

@@ -1,8 +1,11 @@
 """
 Functionality relating to individual colours.
 """
+from __future__ import annotations
+
+import re
 from dataclasses import dataclass
-from typing import Tuple
+from typing import Tuple, Any
 
 
 @dataclass(frozen=True)
@@ -16,9 +19,25 @@ class Colour:
     @property
     def rgb(self) -> Tuple[int, int, int]:
         """Get the colour as a 3-tuple of red, green, and blue."""
-        return (self.red, self.green, self.blue)
+        return self.red, self.green, self.blue
 
     @property
     def hex(self) -> str:
         """Get the colour as a lowercase hex string."""
         return f"{self.red:02x}{self.green:02x}{self.blue:02x}"
+
+    def __eq__(self, other: Any) -> bool:
+        if not isinstance(other, Colour):
+            raise ValueError("Cannot check equality with non-colour types.")
+        return self.hex == other.hex
+
+    @classmethod
+    def from_hex(cls, hex_string: str) -> Colour:
+        """Create a color from hex string."""
+        if len(hex_string) != 6:
+            raise ValueError("Hex string must be 6 characters long.")
+        match = re.match(r"([\da-fA-F]{2})" * 3, hex_string)
+        if match is None:
+            raise ValueError("Hex string have an invalid format.")
+        r, g, b = match.groups()
+        return Colour(*(int(col, 16) for col in (r, g, b)))