From 34e63dd30e323d8943afe3d394a59fd2eb5ce235 Mon Sep 17 00:00:00 2001
From: Anairkoen Schno <aaron.cirr.com@gmail.com>
Date: Mon, 15 Jul 2019 21:10:59 -0500
Subject: [PATCH] Mod yeeter now only compares 'important' parts of version for
 equality

---
 IPA.Loader/Loader/PluginManager.cs |  2 +-
 IPA.Loader/Utilities/Utils.cs      | 16 ++++++++++++++++
 2 files changed, 17 insertions(+), 1 deletion(-)

diff --git a/IPA.Loader/Loader/PluginManager.cs b/IPA.Loader/Loader/PluginManager.cs
index 8febf337..cad6dd88 100644
--- a/IPA.Loader/Loader/PluginManager.cs
+++ b/IPA.Loader/Loader/PluginManager.cs
@@ -296,7 +296,7 @@ namespace IPA.Loader
             var lastVerS = SelfConfig.SelfConfigRef.Value.LastGameVersion;
             var lastVer = lastVerS != null ? new SemVer.Version(lastVerS, true) : null;
 
-            if (lastVer != null && gameVer != lastVer)
+            if (lastVer != null && Utils.VersionCompareNoPrerelease(gameVer, lastVer) != 0)
             {
                 var oldPluginsName = Path.Combine(BeatSaber.InstallPath, $"Old {lastVer} Plugins");
                 var newPluginsName = Path.Combine(BeatSaber.InstallPath, $"Old {gameVer} Plugins");
diff --git a/IPA.Loader/Utilities/Utils.cs b/IPA.Loader/Utilities/Utils.cs
index a9147d86..6f71ecd1 100644
--- a/IPA.Loader/Utilities/Utils.cs
+++ b/IPA.Loader/Utilities/Utils.cs
@@ -166,5 +166,21 @@ namespace IPA.Utilities
                 else return DateTime.MinValue.AddTicks((long)UnsafeAdvanceTicks++); // return MinValue as a fallback
             }
         }
+
+        /// <summary>
+        /// Compares a pair of <see cref="SemVer.Version"/>s ignoring both the prerelease and build fields.
+        /// </summary>
+        /// <param name="l">the left value</param>
+        /// <param name="r">the right value</param>
+        /// <returns>-1 if l is less than r, 0 if they are equal in the numeric portion, or 1 if l is greater than r</returns>
+        public static int VersionCompareNoPrerelease(SemVer.Version l, SemVer.Version r)
+        {
+            var cmpVal = l.Major - r.Major;
+            if (cmpVal != 0) return cmpVal;
+            cmpVal = l.Minor - r.Minor;
+            if (cmpVal != 0) return cmpVal;
+            cmpVal = l.Patch - r.Patch;
+            return cmpVal;
+        }
     }
 }