postinstall script

postinstall.js

@@ -0,0 +1,18 @@
+const fs = require('fs');
+const ncp = require('ncp').ncp;
+
+const pad0 = n => ('0'+n).substr(-2);
+
+const datetime = new Date();
+const dir = `./data/${datetime.getFullYear()}/${pad0(datetime.getMonth())}/${pad0(datetime.getDay())}/`;
+
+if (!fs.existsSync(dir)) {
+    fs.mkdirSync(dir, {recursive: true});
+}
+
+ncp('./sample_data/',dir, function(err){
+    if(err)
+        console.error(err);
+    else
+        console.log('done');
+});