Added date functions.

Added `now` and `date` both allow you to add a timestamp to your
request. Formatting can be controlled globally via the plugin settings
or locally as a final argument when called.

beau.yml

@@ -0,0 +1,12 @@
+endpoint: https://webhook.site/
+
+plugins:
+  - std:
+      date:
+        format: 'YYYY-MM-DD'
+
+POST /8806bba7-d947-47bf-9445-cccc73e92bb8:
+  alias: test
+  payload:
+    today: $[now(`YYYY`)]
+    someDay: $[date(2018, 5, 17)]

lib/index.js

@@ -1,8 +1,13 @@
+const date = require('./plugins/date');
+const fileSystem = require('./plugins/fileSystem.js');
+
 class STD {
-    constructor(registry) {
+	constructor(
-        const FileSystem = require('./plugins/fileSystem.js');
+		registry,
-        new FileSystem(registry);
+		settings = { date: { format: 'YYYY-MM-DDTHH:mm:ss.SSSZ' } }
-    }
+	) {
+		[date, fileSystem].forEach(plugin => plugin(registry, settings));
+	}
 }
 
 module.exports = STD;

lib/plugins/date.js

@@ -0,0 +1,13 @@
+const format = require('date-fns/format');
+
+module.exports = (registry, settings) => {
+	registry.defineDynamicValue('now', (fmt = settings.date.format) =>
+		format(Date.now(), fmt)
+	);
+
+	registry.defineDynamicValue(
+		'date',
+		(year, month, day, fmt = settings.date.format) =>
+			format(new Date(year, month - 1, day), fmt)
+	);
+};

lib/plugins/fileSystem.js

@@ -1,9 +1,4 @@
 const fs = require('fs');
 
-class FileSystem {
+module.exports = registry =>
-    constructor(registry) {
+	registry.defineDynamicValue('createReadStream', fs.createReadStream);
-        registry.defineDynamicValue('createReadStream', fs.createReadStream);
-    }
-}
-
-module.exports = FileSystem;

package.json

@@ -19,7 +19,9 @@
         "url": "https://github.com/seich/beau-std/issues"
     },
     "homepage": "https://github.com/seich/beau-std#readme",
-    "dependencies": {},
+    "dependencies": {
+        "date-fns": "^1.29.0"
+    },
     "devDependencies": {
         "jest": "^22.4.3"
     }