Add logging handler.

pre_commit/color.py

@@ -3,6 +3,8 @@ import sys
 
 RED = '\033[41m'
 GREEN = '\033[42m'
+YELLOW = '\033[43;30m'
+TURQUOISE = '\033[46;30m'
 NORMAL = '\033[0m'
 
 

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(),
+            )
+        )

pre_commit/repository.py

@@ -1,7 +1,6 @@
 
-from __future__ import print_function
-
 import contextlib
+import logging
 from plumbum import local
 
 import pre_commit.constants as C
@@ -14,6 +13,9 @@ from pre_commit.util import cached_property
 from pre_commit.util import clean_path_on_failure
 
 
+logger = logging.getLogger('pre_commit')
+
+
 class Repository(object):
     def __init__(self, repo_config):
         self.repo_config = repo_config
@@ -66,9 +68,9 @@ class Repository(object):
                 return
 
             # Checking out environment for the first time
-            print('Installing environment for {0}.'.format(self.repo_url))
-            print('Once installed this environment will be reused.')
-            print('This may take a few minutes...')
+            logger.info('Installing environment for {0}.'.format(self.repo_url))
+            logger.info('Once installed this environment will be reused.')
+            logger.info('This may take a few minutes...')
             with clean_path_on_failure(unicode(local.path(self.sha))):
                 local['git']['clone', '--no-checkout', self.repo_url, self.sha]()
                 with self.in_checkout():

pre_commit/run.py

@@ -2,16 +2,20 @@
 from __future__ import print_function
 
 import argparse
+import logging
 import subprocess
 import sys
 
 from pre_commit import color
 from pre_commit import commands
 from pre_commit import git
+from pre_commit.logging_handler import LoggingHandler
 from pre_commit.runner import Runner
 from pre_commit.util import entry
 
 
+logger = logging.getLogger('pre_commit')
+
 COLS = int(subprocess.Popen(['tput', 'cols'], stdout=subprocess.PIPE).communicate()[0])
 
 PASS_FAIL_LENGTH = 6
@@ -81,6 +85,10 @@ def run_single_hook(runner, hook_id, args):
 
 
 def _run(runner, args):
+    # Set up our logging handler
+    logger.addHandler(LoggingHandler(args.color))
+    logger.setLevel(logging.INFO)
+
     if args.hook:
         return run_single_hook(runner, args.hook, args)
     else:

tests/repository_test.py

@@ -1,10 +1,10 @@
-import __builtin__
 import mock
 import os
 import pytest
 
 import pre_commit.constants as C
 from pre_commit import git
+from pre_commit import repository
 from pre_commit.clientlib.validate_config import CONFIG_JSON_SCHEMA
 from pre_commit.clientlib.validate_config import validate_config_extra
 from pre_commit.jsonschema_extensions import apply_defaults
@@ -135,23 +135,25 @@ def test_languages(config_for_python_hooks_repo):
 
 
 @pytest.yield_fixture
-def print_mock():
-    with mock.patch.object(__builtin__, 'print', autospec=True) as print_mock:
-        yield print_mock
+def logger_mock():
+    with mock.patch.object(
+        repository.logger, 'info', autospec=True,
+    ) as info_mock:
+        yield info_mock
 
 
-def test_prints_while_creating(config_for_python_hooks_repo, print_mock):
+def test_prints_while_creating(config_for_python_hooks_repo, logger_mock):
     repo = Repository(config_for_python_hooks_repo)
     repo.require_created()
-    print_mock.assert_called_with('This may take a few minutes...')
-    print_mock.reset_mock()
+    logger_mock.assert_called_with('This may take a few minutes...')
+    logger_mock.reset_mock()
     # Reinstall with same repo should not trigger another install
     repo.require_created()
-    assert print_mock.call_count == 0
+    assert logger_mock.call_count == 0
     # Reinstall on another run should not trigger another install
     repo = Repository(config_for_python_hooks_repo)
     repo.require_created()
-    assert print_mock.call_count == 0
+    assert logger_mock.call_count == 0
 
 
 def test_reinstall(config_for_python_hooks_repo):