Split out compose.config.errors

Signed-off-by: Aanand Prasad <aanand.prasad@gmail.com>

compose/config/config.py

@@ -8,6 +8,12 @@ import six
 
 from compose.cli.utils import find_candidates_in_parent_dirs
 
+from .errors import (
+    ConfigurationError,
+    CircularReference,
+    ComposeFileNotFound,
+)
+
 
 DOCKER_CONFIG_KEYS = [
     'cap_add',
@@ -536,33 +542,3 @@ def load_yaml(filename):
             return yaml.safe_load(fh)
     except IOError as e:
         raise ConfigurationError(six.text_type(e))
-
-
-class ConfigurationError(Exception):
-    def __init__(self, msg):
-        self.msg = msg
-
-    def __str__(self):
-        return self.msg
-
-
-class CircularReference(ConfigurationError):
-    def __init__(self, trail):
-        self.trail = trail
-
-    @property
-    def msg(self):
-        lines = [
-            "{} in {}".format(service_name, filename)
-            for (filename, service_name) in self.trail
-        ]
-        return "Circular reference:\n  {}".format("\n  extends ".join(lines))
-
-
-class ComposeFileNotFound(ConfigurationError):
-    def __init__(self, supported_filenames):
-        super(ComposeFileNotFound, self).__init__("""
-        Can't find a suitable configuration file in this directory or any parent. Are you in the right directory?
-
-        Supported filenames: %s
-        """ % ", ".join(supported_filenames))

compose/config/errors.py

@@ -0,0 +1,28 @@
+class ConfigurationError(Exception):
+    def __init__(self, msg):
+        self.msg = msg
+
+    def __str__(self):
+        return self.msg
+
+
+class CircularReference(ConfigurationError):
+    def __init__(self, trail):
+        self.trail = trail
+
+    @property
+    def msg(self):
+        lines = [
+            "{} in {}".format(service_name, filename)
+            for (filename, service_name) in self.trail
+        ]
+        return "Circular reference:\n  {}".format("\n  extends ".join(lines))
+
+
+class ComposeFileNotFound(ConfigurationError):
+    def __init__(self, supported_filenames):
+        super(ComposeFileNotFound, self).__init__("""
+        Can't find a suitable configuration file in this directory or any parent. Are you in the right directory?
+
+        Supported filenames: %s
+        """ % ", ".join(supported_filenames))