add example rules change file

this rules change file will work as expected when watching the replay

External/CustomOnlineSettings/MediumItems.asm

@@ -0,0 +1,50 @@
+################################################################################
+# Address: 0x8000c160 # Zero_AreaLength (see notes below)
+################################################################################
+.include "Common/Common.s"
+.include "Online/Online.s"
+.include "Recording/Recording.s"
+
+  # This is a jank injection location because we need to run this after InitOnlinePlay but
+  # before SendGameInfo. We are injecting here to hijack a function call from SendGameInfo.
+  # Overwriting the settings in this particular location is important because it happens
+  # after the online mode game block has been set up but before the game block is written
+  # to the replay file. This allows for the replays to play back with the correct settings.
+  # This injection is designed to only overwrite settings in direct and teams modes.
+
+  # Check if in an online in-game scene. If not, don't run the code
+  getMinorMajor r7
+  cmpwi r7, SCENE_ONLINE_IN_GAME
+  bne Exit
+
+  # If in ranked or unranked, don't run the code
+  lbz r7, OFST_R13_ONLINE_MODE(r13)
+  cmpwi r7, ONLINE_MODE_RANKED
+  beq Exit
+  cmpwi r7, ONLINE_MODE_UNRANKED
+  beq Exit
+
+  # This should check if we are in StartMelee by looking for the return loc in the stack.
+  # This means we will actually run the settings override multiple times including when
+  # we don't really need to but I don't think it's going to break anything. As long
+  # as it happens the one time we need it, that's all that matters.
+  lwz r7, 0x104(r1)
+  load r8, 0x8016e94c
+  cmpw r7, r8
+  bne Exit
+
+  # For every other online mode (direct, teams), run the code
+
+EditRules:
+
+  .set GameInfoBlock, 0x80480530
+  .set ItemFrequency, 0xB
+  .set ItemsMedium, 0x02
+
+  load r8, GameInfoBlock
+  
+  li r7, ItemsMedium
+  stb r7, ItemFrequency (r8)
+
+Exit:
+  cmpwi r4, 0 # replaced code line

Output/InjectionLists/list_netplay.json

@@ -2113,6 +2113,13 @@
    "Codetype": "Auto",
    "Annotation": "Online/Optional/ShowAllyIndicator/ShowAllyIndicator.asm",
    "Tags": ""
+  },
+  {
+   "InjectionAddress": "8000C160",
+   "Name": "Optional: Rollback Items",
+   "Codetype": "Auto",
+   "Annotation": "External/CustomOnlineSettings/MediumItems.asm",
+   "Tags": ""
   }
  ]
 }

Output/Netplay/GALE01r2.ini

@@ -7208,3 +7208,18 @@ C0230064 BA810008
 BA810008 800100B4
 382100B0 7C0803A6
 60000000 00000000
+
+$Optional: Rollback Items [Fizzi, Krohnos]
+*Rollback items
+C200C160 0000000B #External/CustomOnlineSettings/MediumItems.asm
+3CE08048 80E79D30
+54E7443E 2C070208
+4082003C 88EDAFA0
+2C070000 41820030
+2C070001 41820028
+80E10104 3D008016
+6108E94C 7C074000
+40820014 3D008048
+61080530 38E00002
+98E8000B 2C040000
+60000000 00000000

Output/Netplay/GALJ01r2.ini

@@ -7207,3 +7207,18 @@ C0230064 BA810008
 BA810008 800100B4
 382100B0 7C0803A6
 60000000 00000000
+
+$Optional: Rollback Items [Fizzi, Krohnos]
+*Rollback items
+C200C160 0000000B #External/CustomOnlineSettings/MediumItems.asm
+3CE08048 80E79D30
+54E7443E 2C070208
+4082003C 88EDAFA0
+2C070000 41820030
+2C070001 41820028
+80E10104 3D008016
+6108E94C 7C074000
+40820014 3D008048
+61080530 38E00002
+98E8000B 2C040000
+60000000 00000000

netplay.json

@@ -521,6 +521,23 @@
           "isRecursive": true
         }
       ]
+    },
+    {
+      "name": "Optional: Rollback Items",
+      "authors": [
+        "Fizzi",
+        "Krohnos"
+      ],
+      "description": [
+        "Rollback items"
+      ],
+      "build": [
+        {
+          "type": "injectFolder",
+          "sourceFolder": "External/CustomOnlineSettings",
+          "isRecursive": true
+        }
+      ]
     }
   ]
 }