Add config directory support

This takes @rtrox's work in GH-93 and cleans it up a bit; pretty much
just taking out unrelated changes that were inadvertently included.
@rtrox deserves credit for the feature.

This closes #93.

Author: msabramo

supernova/config.py

@@ -42,12 +42,28 @@ def load_config(config_file_override=False):
     Pulls the supernova configuration file and reads it
     """
     supernova_config = get_config_file(config_file_override)
+    supernova_config_dir = get_config_directory(config_file_override)
+
+    if not supernova_config and not supernova_config_dir:
+        raise Exception("Couldn't find a valid configuration file to parse")
+
+    nova_creds = ConfigObj()
 
     # Can we successfully read the configuration file?
-    try:
-        nova_creds = ConfigObj(supernova_config)
-    except:
-        raise
+    if supernova_config:
+        try:
+            nova_creds.merge(ConfigObj(supernova_config))
+        except:
+            raise("There's an error in your configuration file")
+
+    if supernova_config_dir:
+        for dir_file in os.listdir(supernova_config_dir):
+            full_path = ''.join((supernova_config_dir, dir_file))
+            try:
+                nova_creds.merge(ConfigObj(full_path))
+            except:
+                msg = "Skipping '%s', Parsing Error.".format(full_path)
+                print(msg)
 
     create_dynamic_configs(nova_creds)
     return nova_creds
@@ -74,7 +90,29 @@ def get_config_file(override_files=False):
         if os.path.isfile(config_file):
             return config_file
 
-    raise Exception("Couldn't find a valid configuration file to parse")
+    return False
+
+
+def get_config_directory(override_files=False):
+    """
+    Looks for the most specific configuration directory possible, in order to
+    load individual configuration files.
+    """
+    if override_files:
+        possible_dirs = [override_files]
+
+    else:
+        xdg_config_home = os.environ.get('XDG_CONFIG_HOME') or \
+            os.path.expanduser('~/.config')
+        possible_dirs = [os.path.join(xdg_config_home, "supernova.d/"),
+                         os.path.expanduser("~/.supernova.d/"),
+                         ".supernova.d/"]
+
+    for config_dir in reversed(possible_dirs):
+        if os.path.isdir(config_dir):
+            return config_dir
+
+    return False
 
 
 def create_dynamic_configs(config,

tests/test_executable.py

@@ -176,6 +176,14 @@ def test_broken_configuration_file(self):
         assert result.exit_code != 0
         assert "There's an error in your configuration file" in result.output
 
+    def test_broken_configuration_directory(self):
+        runner = CliRunner()
+        command = ['-c', 'tests/configs/', 'dfw',
+                   'list']
+        result = runner.invoke(executable.run_supernova, command)
+        assert "Skipping 'tests/configs/rax_without_keyring_malformed', "
+        "Parsing Error." in result.output
+
     def test_dashboard(self, monkeypatch):
         def mockreturn(url):
             return False