enhance support for precision bit in LEVELNAME_FMT_REGEX regex

Author: kumiDa

changelog/8548.bugfix.rst

@@ -0,0 +1 @@
+Introduce fix to handle precision width in ``log-cli-format`` in turn to fix output coloring for certain formats.

src/_pytest/logging.py

@@ -59,7 +59,7 @@ class ColoredLevelFormatter(logging.Formatter):
         logging.DEBUG: {"purple"},
         logging.NOTSET: set(),
     }
-    LEVELNAME_FMT_REGEX = re.compile(r"%\(levelname\)([+-.]?\d*[.]?\d*s)")
+    LEVELNAME_FMT_REGEX = re.compile(r"%\(levelname\)([+-.]?\d*(?:\.\d+)?s)")
 
     def __init__(self, terminalwriter: TerminalWriter, *args, **kwargs) -> None:
         super().__init__(*args, **kwargs)

testing/logging/test_formatter.py

@@ -36,6 +36,37 @@ class option:
     assert output == ("dummypath                   10 INFO     Test Message")
 
 
+def test_coloredlogformatter_with_width_precision() -> None:
+    logfmt = "%(filename)-25s %(lineno)4d %(levelname)-8.2s %(message)s"
+
+    record = logging.LogRecord(
+        name="dummy",
+        level=logging.INFO,
+        pathname="dummypath",
+        lineno=10,
+        msg="Test Message",
+        args=(),
+        exc_info=None,
+    )
+
+    class ColorConfig:
+        class option:
+            pass
+
+    tw = TerminalWriter()
+    tw.hasmarkup = True
+    formatter = ColoredLevelFormatter(tw, logfmt)
+    output = formatter.format(record)
+    assert output == (
+        "dummypath                   10 \x1b[32mINFO    \x1b[0m Test Message"
+    )
+
+    tw.hasmarkup = False
+    formatter = ColoredLevelFormatter(tw, logfmt)
+    output = formatter.format(record)
+    assert output == ("dummypath                   10 INFO     Test Message")
+
+
 def test_multiline_message() -> None:
     from _pytest.logging import PercentStyleMultiline