Large code refactoring

* Add tests
* Remove git dependency (only needed when a git identifier is specified)

django_migration_linter/utils.py

@@ -0,0 +1,54 @@
+# Copyright 2017 3YOURMIND GmbH
+
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+
+# http://www.apache.org/licenses/LICENSE-2.0
+
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+from __future__ import print_function
+import os
+import re
+
+
+def is_django_project(path):
+    django_manage_file = os.path.join(path, 'manage.py')
+    return os.path.isfile(django_manage_file)
+
+
+def is_git_project(path):
+    git_directory = os.path.join(path, '.git')
+    return os.path.isdir(git_directory)
+
+
+def is_directory(path):
+    return os.path.isdir(path)
+
+
+def print_stderr(*args, **kwargs):
+    print(*args, file=sys.stderr, **kwargs)
+
+
+def find_project_settings_module(path):
+    """Explore path recursively to the first settings.py file
+    and translate the name to package notation 'mysite.settings'
+    """
+    for root, dirs, files in os.walk(path):
+        for file_name in files:
+            if file_name == 'settings.py':
+                return os.path.join(root.replace(path, ''), file_name).replace('/', '.').rstrip('.py')
+
+
+def split_path(path):
+    a, b = os.path.split(path)
+    return (split_path(a) if (len(a) > 0 and a != '/') else []) + [b]
+
+
+def clean_bytes_to_str(byte_input):
+    return byte_input.decode('utf-8').strip()