Adding new functions to control the commit data file

lib/index.js

@@ -161,6 +161,8 @@ GitStats.prototype.record = function (data, callback) {
     if (!/^moment|date$/.test(Typpy(data.date))) {
         callback(new Error("The date field should be a string or a date object."));
         return GitStats;
+    } else if (Typpy(data.date, Date)) {
+        data.date = Moment(data.date);
     }
 
     if (typeof data.hash !== "string" || !data.hash) {
@@ -203,6 +205,77 @@ GitStats.prototype.record = function (data, callback) {
     return self;
 };
 
+/**
+ * removeCommit
+ * Deletes a specifc commit from the history.
+ *
+ * @name record
+ * @function
+ * @param {Object} data The commit data containing:
+ *
+ *  - `date` (String|Date): The date object or a string in a format that can be parsed.
+ *  - `hash` (String): The commit hash.
+ *  - `_data` (Object): If this field is provided, it should be the content of the git-stats data file as object. It will be modified in-memory and then returned.
+ *  - `save` (Boolean): If `false`, the result will *not* be saved in the file.
+ *
+ * @param {Function} callback The callback function.
+ * @return {GitStats} The `GitStats` instance.
+ */
+GitStats.prototype.removeCommit = function (data, callback) {
+
+    var self = this;
+
+    // Validate data
+    callback = callback || function (err) { if (err) throw err; };
+    data = Object(data);
+
+    if (typeof data.date === "string") {
+        data.date = new Moment(new Date(data.date));
+    }
+
+    if (!/^moment|date$/.test(Typpy(data.date))) {
+        callback(new Error("The date field should be a string or a date object."));
+        return GitStats;
+    } else if (Typpy(data.date, Date)) {
+        data.date = Moment(data.date);
+    }
+
+    if (typeof data.hash !== "string" || !data.hash) {
+        callback(new Error("Invalid hash."));
+        return GitStats;
+    }
+
+    function modify (err, stats) {
+
+        if (err) { return callback(err); }
+
+        var commits = stats.commits
+          , day = data.date.format(DATE_FORMAT)
+          , today = commits[day] = Object(commits[day])
+          ;
+
+        delete today[data.hash];
+
+        if (data.save === false) {
+            callback(null, stats);
+        } else {
+            self.save(stats, callback);
+        }
+
+        return stats;
+    }
+
+    // Check if we have input data
+    if (data._data) {
+        return modify(null, data._data);
+    } else {
+        // Get stats
+        self.get(modify);
+    }
+
+    return self;
+};
+
 /**
  * get
  * Gets the git stats.