Validate data.

lib/index.js

@@ -1,6 +1,7 @@
 // Dependencies
 var FsExtra = require("fs-extra")
   , Ul = require("ul")
+  , Moment = require("moment")
   ;
 
 const STORE_PATH = Ul.USER_DIR + "/.git-stats";
@@ -8,11 +9,50 @@ const STORE_PATH = Ul.USER_DIR + "/.git-stats";
 // Constructor
 var GitStats = module.exports = {};
 
+/**
+ * record
+ * Records a new commit.
+ *
+ * @name record
+ * @function
+ * @param {Object} data The commit data containing:
+ *
+ *  - `date` (String|Date): The date object or a string in this format: `DDD MMM dd HH:mm:ss YYYY`
+ *  - `url` (String): The repository remote url.
+ *  - `hash` (String): The commit hash.
+ *
+ * @param {Function} callback The callback function.
+ * @return {undefined}
+ */
 GitStats.record = function (data, callback) {
+    callback = callback || function (err) { if (err) throw err; };
+    data = Object(data);
+
+    if (typeof data.date === "string") {
+        data.date = Moment(data.date, "DDD MMM dd HH:mm:ss YYYY");
+    }
+
+    if (!data.date || data.date.constructor !== Date || isNaN(data.date.getTime())) {
+        return callback(new Error("The date field should be a string or a date object."));
+    }
+
+    if (typeof data.hash !== "string" || !data.hash) {
+        return callback(new Error("Invalid hash."));
+    }
+
+    if (typeof data.url !== "string" || !data.url) {
+        return callback(new Error("Invalid url field."));
+    }
+
     FsExtra.readJSON(STORE_PATH, function (err, stats) {
         stats = stats || {};
-        var thisRepo = stats[data.url] = Object(stats[data.url]);
-        thisRepo[data.hash] = { date: data.date };
+        var day = data.date.format("MMM DDD dd, YYYY")
+          , today = stats[day] = Object(stats[day])
+          , repo = today[data.url] = Object(today[data.url])
+          ;
+
+        repo[data.hash] = { date: data.date };
+
         FsExtra.writeJSON(STORE_PATH, stats, callback);
     });
 };