Test repo can now be used to list entries

src/formats/yaml.js

@@ -0,0 +1,31 @@
+import yaml from 'js-yaml';
+import moment from 'moment';
+
+const MomentType = new yaml.Type('date', {
+  kind: 'scalar',
+  predicate: function(value) {
+    return moment.isMoment(value);
+  },
+  represent: function(value) {
+    return value.format(value._f);
+  },
+  resolve: function(value) {
+    return moment.isMoment(value) && value._f;
+  }
+});
+
+const OutputSchema = new yaml.Schema({
+  include: yaml.DEFAULT_SAFE_SCHEMA.include,
+  implicit: [MomentType].concat(yaml.DEFAULT_SAFE_SCHEMA.implicit),
+  explicit: yaml.DEFAULT_SAFE_SCHEMA.explicit
+});
+
+export default class YAML {
+  fromFile(content) {
+    return yaml.safeLoad(content);
+  }
+
+  toFile(data) {
+    return yaml.safeDump(data, {schema: OutputSchema});
+  }
+}