Split plugins

docs/scripts/02-derived.js

@@ -0,0 +1,13 @@
+const Metalsmith = require('metalsmith');
+const filter = require('metalsmith-filter');
+
+const regex_derived = '**/derived-variables.sass';
+const derived_plugin = require('./plugins/02-read-derived-variables');
+
+Metalsmith(__dirname)
+  .source('../../sass')
+  .use(filter(regex_derived))
+  .use(derived_plugin())
+  .build(function(err) {
+    if (err) throw err;
+  });