Add and test loading project configuration

changes/config.py

@@ -1,16 +1,47 @@
+from os.path import exists, join
+
+import click
+import yaml
+
+CONFIG_FILE = '.changes'
+DEFAULTS = {
+    'changelog': 'CHANGELOG.md',
+    'readme': 'README.md',
+}
+
 
 class CLI(object):
     test_command = None
     pypi = None
     skip_changelog = None
 
-    def __init__(self, module_name, dry_run, debug, no_input, requirements, new_version, current_version, repo_url, version_prefix):
+    def __init__(self, module_name, dry_run, debug, no_input, requirements,
+                 new_version, current_version, repo_url, version_prefix):
         self.module_name = module_name
         self.dry_run = dry_run
         self.debug = debug
         self.no_input = no_input
         self.requirements = requirements
-        self.new_version = version_prefix + new_version if version_prefix else new_version
+        self.new_version = (
+            version_prefix + new_version
+            if version_prefix
+            else new_version
+        )
         self.current_version = current_version
         self.repo_url = repo_url
 
+
+def project_config(context):
+    config = {}
+    config_path = join(context.module_name, CONFIG_FILE)
+
+    # initialise config with defaults
+    if not exists(config_path):
+        config = DEFAULTS.copy()
+
+        with click.open_file(config_path, 'w') as f:
+            config_yaml = yaml.dump(config, default_flow_style=False)
+            f.write(config_yaml)
+
+    config = yaml.safe_load(click.open_file(config_path))
+    return config or {}

requirements/runtime.txt

@@ -1,3 +1,4 @@
+PyYAML < 4.0.0
 plumbum < 1.5.0 
 click < 2.6.0
 path.py < 5.0.0

tests/test_config.py

@@ -0,0 +1,25 @@
+from os.path import exists
+
+import click
+
+from changes import config
+from . import context, setup, teardown  # noqa
+
+
+def test_no_config():
+    assert not exists('test_app/.changes')
+    assert config.project_config(context) == config.DEFAULTS
+    assert exists('test_app/.changes')
+
+
+def test_existing_config():
+    existing_config = 'foo: bar\nbaz: buzz\n'
+    with click.open_file('test_app/.changes', 'w') as f:
+        f.write(existing_config)
+    assert config.project_config(context) == {'foo': 'bar', 'baz': 'buzz'}
+
+
+def test_malformed_config_returns_none():
+    with click.open_file('test_app/.changes', 'w') as f:
+        f.write('something\n\n-another thing\n')
+        assert config.project_config(context) == {}