Colorize "fail-on" messages/categories in ColorizedTextReporter red inverse

doc/whatsnew/fragments/9898.feature

@@ -0,0 +1,4 @@
+colorized reporter now colorizes messages/categories that have been configured as `fail-on` in red inverse.
+This makes it easier to quickly find the errors that are causing pylint CI job failures.
+
+Closes #9898

pylint/config/config_initialization.py

@@ -139,6 +139,9 @@ def _config_initialization(  # pylint: disable=too-many-statements
     # enable them
     linter.enable_fail_on_messages()
 
+    # Now that fail_on messages are enabled, pass them to colorized reporter
+    linter.pass_fail_on_config_to_color_reporter()
+
     linter._parse_error_mode()
 
     # Link the base Namespace object on the current directory

pylint/lint/pylinter.py

@@ -55,7 +55,7 @@
 from pylint.message import Message, MessageDefinition, MessageDefinitionStore
 from pylint.reporters.base_reporter import BaseReporter
 from pylint.reporters.progress_reporters import ProgressReporter
-from pylint.reporters.text import TextReporter
+from pylint.reporters.text import ColorizedTextReporter, TextReporter
 from pylint.reporters.ureports import nodes as report_nodes
 from pylint.typing import (
     DirectoryNamespaceDict,
@@ -531,6 +531,15 @@
     def any_fail_on_issues(self) -> bool:
         return any(x in self.fail_on_symbols for x in self.stats.by_msg.keys())
 
+    def pass_fail_on_config_to_color_reporter(self) -> None:
+        """Pass fail_on symbol configuration to colorized text reporter."""
+        if isinstance(self.reporter, ColorizedTextReporter):
+            self.reporter.set_fail_on_symbols(self.fail_on_symbols)
+        elif isinstance(self.reporter, reporters.MultiReporter):
+            for _reporter in self.reporter._sub_reporters:
+                if isinstance(self.reporter, ColorizedTextReporter):
+                    self.reporter.set_fail_on_symbols(self.fail_on_symbols)
+
     def disable_reporters(self) -> None:
         """Disable all reporters."""
         for _reporters in self._reports.values():

pylint/reporters/text.py

@@ -215,6 +215,7 @@
         "W": MessageStyle("magenta"),
         "E": MessageStyle("red", ("bold",)),
         "F": MessageStyle("red", ("bold", "underline")),
+        "X": MessageStyle("red", ("bold", "inverse")),
         "S": MessageStyle("yellow", ("inverse",)),  # S stands for module Separator
     }
 
@@ -225,6 +226,7 @@
     ) -> None:
         super().__init__(output)
         self.color_mapping = color_mapping or ColorizedTextReporter.COLOR_MAPPING
+        self.fail_on_symbols: list[str] = []
         ansi_terms = ["xterm-16color", "xterm-256color"]
         if os.environ.get("TERM") not in ansi_terms:
             if sys.platform == "win32":
@@ -237,6 +239,10 @@
         """Returns the message style as defined in self.color_mapping."""
         return self.color_mapping.get(msg_id[0]) or MessageStyle(None)
 
+    def set_fail_on_symbols(self, fail_on_symbols: list[str]) -> None:
+        """Sets the list of configured fail-on symbols."""
+        self.fail_on_symbols = fail_on_symbols
+
     def handle_message(self, msg: Message) -> None:
         """Manage message of different types, and colorize output
         using ANSI escape codes.
@@ -246,7 +252,10 @@
             modsep = colorize_ansi(make_header(msg), msg_style)
             self.writeln(modsep)
             self._modules.add(msg.module)
-        msg_style = self._get_decoration(msg.C)
+        if msg.symbol in self.fail_on_symbols:
+            msg_style = self._get_decoration("X")
+        else:
+            msg_style = self._get_decoration(msg.C)
 
         msg.msg = colorize_ansi(msg.msg, msg_style)
         msg.symbol = colorize_ansi(msg.symbol, msg_style)