Add logging handler.

pre_commit/logging_handler.py

@@ -0,0 +1,32 @@
+
+from __future__ import print_function
+
+import logging
+
+from pre_commit import color
+
+
+LOG_LEVEL_COLORS = {
+    'DEBUG': '',
+    'INFO': '',
+    'WARNING': color.YELLOW,
+    'ERROR': color.RED,
+}
+
+
+class LoggingHandler(logging.Handler):
+    def __init__(self, use_color):
+        super(LoggingHandler, self).__init__()
+        self.use_color = use_color
+
+    def emit(self, record):
+        print(
+            u'{0}{1}'.format(
+                color.format_color(
+                    '[{0}]'.format(record.levelname),
+                    LOG_LEVEL_COLORS[record.levelname],
+                    self.use_color,
+                ) + ' ' if record.levelno >= logging.WARNING else '',
+                record.getMessage(),
+            )
+        )