Support 256 color codes

Based on https://github.com/borntyping/python-colorlog/pull/88/files

Author: borntyping

colorlog/escape_codes.py

@@ -93,6 +93,11 @@ def esc(*codes: int) -> str:
 for name, code in escape_codes_background.items():
     escape_codes["bg_%s" % name] = esc(code)
 
+# 256 colour support
+for code in range(256):
+    escape_codes["fg_%d" % code] = esc(38, 5, code)
+    escape_codes["bg_%d" % code] = esc(48, 5, code)
+
 
 def parse_colors(string: str) -> str:
     """Return escape codes from a color sequence string."""

colorlog/tests/test_escape_codes.py

@@ -6,7 +6,7 @@
 
 
 def test_esc():
-    assert esc("1", "2", "3") == "\033[1;2;3m"
+    assert esc(1, 2, 3) == "\033[1;2;3m"
 
 
 def test_reset():
@@ -50,3 +50,9 @@ def test_parse_multiple_colors():
 def test_parse_invalid_colors():
     with pytest.raises(KeyError):
         parse_colors("false")
+
+
+def test_256_colors():
+    for i in range(256):
+        assert parse_colors("fg_%d" % i) == "\033[38;5;%dm" % i
+        assert parse_colors("bg_%d" % i) == "\033[48;5;%dm" % i