Catch Keyboard interruptions in our application

Add logging to our main application

flake8/main/cli.py

@@ -1,4 +1,6 @@
 """Command-line implementation of flake8."""
+import logging
+
 import flake8
 from flake8 import checker
 from flake8 import defaults
@@ -7,6 +9,8 @@ from flake8.options import aggregator
 from flake8.options import manager
 from flake8.plugins import manager as plugin_manager
 
+LOG = logging.getLogger(__name__)
+
 
 def register_default_options(option_manager):
     """Register the default options on our OptionManager."""
@@ -267,9 +271,7 @@ class Application(object):
         """Report all the errors found by flake8 3.0."""
         self.file_checker_manager.report()
 
-    def run(self, argv=None):
-        # type: (Union[NoneType, List[str]]) -> NoneType
-        """Run our application."""
+    def _run(self, argv):
         self.find_plugins()
         self.register_plugin_options()
         self.parse_configuration_and_cli(argv)
@@ -280,6 +282,16 @@ class Application(object):
         self.run_checks()
         self.report_errors()
 
+    def run(self, argv=None):
+        # type: (Union[NoneType, List[str]]) -> NoneType
+        """Run our application."""
+        try:
+            self._run(argv)
+        except KeyboardInterrupt as exc:
+            LOG.critical('Caught keyboard interrupt from user')
+            LOG.exception(exc)
+            self.file_checker_manager._force_cleanup()
+
 
 def main(argv=None):
     # type: (Union[NoneType, List[str]]) -> NoneType