fix parsing of SGR RGB codes using colons

Author: alcarney

rich/ansi.py

@@ -144,6 +144,7 @@ def decode_line(self, line: str) -> Text:
         Returns:
             Text: A Text instance marked up according to ansi codes.
         """
+
         from_ansi = Color.from_ansi
         from_rgb = Color.from_rgb
         _Style = Style
@@ -163,7 +164,7 @@ def decode_line(self, line: str) -> Text:
                 # Ignore invalid codes, because we want to be lenient
                 codes = [
                     min(255, int(_code) if _code else 0)
-                    for _code in sgr.split(";")
+                    for _code in sgr.replace("::", ";").replace(":", ";").split(";")
                     if _code.isdigit() or _code == ""
                 ]
                 iter_codes = iter(codes)

tests/test_ansi.py

@@ -1,5 +1,4 @@
 import pytest
-
 from rich.ansi import AnsiDecoder
 from rich.console import Console
 from rich.style import Style
@@ -70,6 +69,23 @@ def test_decode_issue_2688(ansi_bytes, expected_text):
     assert str(text) == expected_text
 
 
+@pytest.mark.parametrize(
+    "text,expected",
+    [
+        (
+            "\x1b[38;2;255;0;0mred\x1b[0m text",
+            Text("red text", spans=[Span(0, 3, Style.parse("#ff0000"))]),
+        ),
+        (
+            "\x1b[38:2::255:0:0mred\x1b[0m text",
+            Text("red text", spans=[Span(0, 3, Style.parse("#ff0000"))]),
+        ),
+    ],
+)
+def test_decode_sgr_rgb(text, expected):
+    assert Text.from_ansi(text) == expected
+
+
 @pytest.mark.parametrize("code", [*"0123456789:;<=>?"])
 def test_strip_private_escape_sequences(code):
     text = Text.from_ansi(f"\x1b{code}x")