From 9e85fd5a2d93a7d1c1cf0f3cc77b2fe16b965f00 Mon Sep 17 00:00:00 2001
From: krawieck <fil.krawczyk@gmail.com>
Date: Wed, 2 Sep 2020 13:47:45 +0200
Subject: [PATCH] Add util extension for calculating hot rank of comments

---
 lib/util/hot_rank.dart | 15 +++++++++++++++
 1 file changed, 15 insertions(+)
 create mode 100644 lib/util/hot_rank.dart

diff --git a/lib/util/hot_rank.dart b/lib/util/hot_rank.dart
new file mode 100644
index 0000000..975e664
--- /dev/null
+++ b/lib/util/hot_rank.dart
@@ -0,0 +1,15 @@
+// import 'dart:core' show ab;
+import 'dart:math' show log, max, pow;
+
+import 'package:lemmy_api_client/lemmy_api_client.dart';
+
+double _calculateHotRank(int score, DateTime time) {
+  final elapsed = (time.difference(DateTime.now()).inMilliseconds).abs() / 36e5;
+
+  // log instead of log10 in web version. does log == log10?
+  return (10000 * log(max(1, 3 + score))) / pow(elapsed + 2, 1.8);
+}
+
+extension CommentHotRank on CommentView {
+  double get computedHotRank => _calculateHotRank(score, published);
+}