From 2c297cb6747080cd47cdcd9bbd23c5f24a092e8f Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Roman=20Smr=C5=BE?= <roman.smrz@seznam.cz>
Date: Sat, 13 Apr 2024 08:29:25 +0200
Subject: Chatroom metadata updates

---
 src/Erebos/Storage/Merge.hs | 4 ++++
 1 file changed, 4 insertions(+)

(limited to 'src/Erebos/Storage')

diff --git a/src/Erebos/Storage/Merge.hs b/src/Erebos/Storage/Merge.hs
index 7234b87..9d9db13 100644
--- a/src/Erebos/Storage/Merge.hs
+++ b/src/Erebos/Storage/Merge.hs
@@ -10,6 +10,7 @@ module Erebos.Storage.Merge (
     generations,
     ancestors,
     precedes,
+    precedesOrEquals,
     filterAncestors,
     storedRoots,
     walkAncestors,
@@ -109,6 +110,9 @@ ancestors = last . (S.empty:) . generations
 precedes :: Storable a => Stored a -> Stored a -> Bool
 precedes x y = not $ x `elem` filterAncestors [x, y]
 
+precedesOrEquals :: Storable a => Stored a -> Stored a -> Bool
+precedesOrEquals x y = filterAncestors [ x, y ] == [ y ]
+
 filterAncestors :: Storable a => [Stored a] -> [Stored a]
 filterAncestors [x] = [x]
 filterAncestors xs = let xs' = uniq $ sort xs
-- 
cgit v1.2.3