Add logic for counting hours spent on git repository

1 files changed, 33 insertions, 5 deletions

diff --git a/index.js b/index.js
index 08caa68..c7a6b03 100644
--- a/index.js
+++ b/index.js
@@ -3,13 +3,21 @@ var git = require('nodegit');
 var moment = require('moment');
 var _ = require('lodash');
 
+var config = {
+    // Maximum time diff between 2 subsequent commits in minutes which are
+    // counted to be in the same coding "session"
+    maxCommitDiffInMinutes: 240,
+
+    // How many minutes should be added for the first commit of coding session
+    firstCommitAdditionInMinutes: 60
+}
+
 function main() {
     commits('.').then(function(commits) {
-        console.log(commits);
-
         var work = {
             total: {
-                hours: estimateHours(_.pluck(commits, 'date'))
+                hours: estimateHours(_.pluck(commits, 'date')),
+                commits: commits.length
             }
         };
 
@@ -21,8 +29,28 @@ function main() {
 
 // Estimates spent working hours based on commit dates
 function estimateHours(dates) {
-    var sortedDates = dates.map(moment).sort();
-    console.log(sortedDates);
+    if (dates.length < 2) {
+        return 0;
+    }
+
+    // Oldest commit first, newest last
+    var sortedDates = dates.sort().reverse();
+    var hours = _.reduce(dates, function(hours, date, index) {
+        var previousDate = dates[index - 1];
+        var diffInMinutes = (date - previousDate) / 1000 / 60;
+
+        // Check if commits are counted to be in same coding session
+        if (diffInMinutes < config.maxCommitDiffInMinutes) {
+            return hours + (diffInMinutes / 60);
+        }
+
+        // The date difference is too big to be inside single coding session
+        // The work of first commit of a session cannot be seen in git history,
+        // so we make a blunt estimate of it
+        return hours + (config.firstCommitAdditionInMinutes / 60);
+    }, 0);
+
+    return hours;
 }