1 files changed, 105 insertions, 0 deletions
diff --git a/pylint/reporters/multi_reporter.py b/pylint/reporters/multi_reporter.py
new file mode 100644
index 000000000..b3b67d87a
--- /dev/null
+++ b/pylint/reporters/multi_reporter.py
@@ -0,0 +1,105 @@
+# Licensed under the GPL: https://www.gnu.org/licenses/old-licenses/gpl-2.0.html
+# For details: https://github.com/PyCQA/pylint/blob/main/LICENSE
+
+
+import os
+from typing import IO, TYPE_CHECKING, Any, AnyStr, Callable, List, Optional
+
+from pylint.interfaces import IReporter
+from pylint.message import Message
+from pylint.reporters.base_reporter import BaseReporter
+from pylint.typing import CheckerStats
+
+if TYPE_CHECKING:
+    from pylint.reporters.ureports.nodes import Section
+
+AnyFile = IO[AnyStr]
+PyLinter = Any
+
+
+class MultiReporter:
+    """Reports messages and layouts in plain text"""
+
+    __implements__ = IReporter
+    name = "_internal_multi_reporter"
+    # Note: do not register this reporter with linter.register_reporter as it is
+    #       not intended to be used directly like a regular reporter, but is
+    #       instead used to implement the
+    #       `--output-format=json:somefile.json,colorized`
+    #       multiple output formats feature
+
+    extension = ""
+
+    def __init__(
+        self,
+        sub_reporters: List[BaseReporter],
+        close_output_files: Callable[[], None],
+        output: Optional[AnyFile] = None,
+    ):
+        self._sub_reporters = sub_reporters
+        self.close_output_files = close_output_files
+
+        self._path_strip_prefix = os.getcwd() + os.sep
+        self._linter: Optional[PyLinter] = None
+
+        self.set_output(output)
+
+    def __del__(self) -> None:
+        self.close_output_files()
+
+    @property
+    def path_strip_prefix(self) -> str:
+        return self._path_strip_prefix
+
+    @property
+    def linter(self) -> Optional[PyLinter]:
+        return self._linter
+
+    @linter.setter
+    def linter(self, value: PyLinter) -> None:
+        self._linter = value
+        for rep in self._sub_reporters:
+            rep.linter = value
+
+    def handle_message(self, msg: Message) -> None:
+        """Handle a new message triggered on the current file."""
+        for rep in self._sub_reporters:
+            rep.handle_message(msg)
+
+    # pylint: disable=no-self-use
+    def set_output(self, output: Optional[AnyFile] = None) -> None:
+        """set output stream"""
+        # MultiReporter doesn't have it's own output. This method is only
+        # provided for API parity with BaseReporter and should not be called
+        # with non-None values for 'output'.
+        if output is not None:
+            raise NotImplementedError("MultiReporter does not support direct output.")
+
+    def writeln(self, string: str = "") -> None:
+        """write a line in the output buffer"""
+        for rep in self._sub_reporters:
+            rep.writeln(string)
+
+    def display_reports(self, layout: "Section") -> None:
+        """display results encapsulated in the layout tree"""
+        for rep in self._sub_reporters:
+            rep.display_reports(layout)
+
+    def display_messages(self, layout: Optional["Section"]) -> None:
+        """hook for displaying the messages of the reporter"""
+        for rep in self._sub_reporters:
+            rep.display_messages(layout)
+
+    def on_set_current_module(self, module: str, filepath: Optional[str]) -> None:
+        """hook called when a module starts to be analysed"""
+        for rep in self._sub_reporters:
+            rep.on_set_current_module(module, filepath)
+
+    def on_close(
+        self,
+        stats: CheckerStats,
+        previous_stats: CheckerStats,
+    ) -> None:
+        """hook called when a module finished analyzing"""
+        for rep in self._sub_reporters:
+            rep.on_close(stats, previous_stats)