1 files changed, 40 insertions, 0 deletions
diff --git a/pre_commit/logging_handler.py b/pre_commit/logging_handler.py
new file mode 100644
index 0000000..ba05295
--- /dev/null
+++ b/pre_commit/logging_handler.py
@@ -0,0 +1,40 @@
+import contextlib
+import logging
+from typing import Generator
+
+from pre_commit import color
+from pre_commit import output
+
+logger = logging.getLogger('pre_commit')
+
+LOG_LEVEL_COLORS = {
+    'DEBUG': '',
+    'INFO': '',
+    'WARNING': color.YELLOW,
+    'ERROR': color.RED,
+}
+
+
+class LoggingHandler(logging.Handler):
+    def __init__(self, use_color: bool) -> None:
+        super().__init__()
+        self.use_color = use_color
+
+    def emit(self, record: logging.LogRecord) -> None:
+        level_msg = color.format_color(
+            f'[{record.levelname}]',
+            LOG_LEVEL_COLORS[record.levelname],
+            self.use_color,
+        )
+        output.write_line(f'{level_msg} {record.getMessage()}')
+
+
+@contextlib.contextmanager
+def logging_handler(use_color: bool) -> Generator[None, None, None]:
+    handler = LoggingHandler(use_color)
+    logger.addHandler(handler)
+    logger.setLevel(logging.INFO)
+    try:
+        yield
+    finally:
+        logger.removeHandler(handler)