From 0852a61caad509ab80e55492a64cf901dcd76220 Mon Sep 17 00:00:00 2001
From: 1ue999 <106450442+1ue999@users.noreply.github.com>
Date: Thu, 3 Jul 2025 19:25:22 +0200
Subject: [PATCH] Read from MessageBlocks/Builds (#10981)

* Added ability to read content of messages and sensing the length of the content.

Also some bundle changes for read/write

* this commit will make mindustry unable to compile trust

* oop missed a space
---
 core/assets/bundles/bundle.properties                   | 6 +++---
 core/src/mindustry/logic/LExecutor.java                 | 2 ++
 core/src/mindustry/world/blocks/logic/MessageBlock.java | 9 +++++++++
 3 files changed, 14 insertions(+), 3 deletions(-)

diff --git a/core/assets/bundles/bundle.properties b/core/assets/bundles/bundle.properties
index fb255a8813..e151709191 100644
--- a/core/assets/bundles/bundle.properties
+++ b/core/assets/bundles/bundle.properties
@@ -2455,8 +2455,8 @@ unit.evoke.description = Builds structures to defend the Bastion core. Repairs s
 unit.incite.description = Builds structures to defend the Citadel core. Repairs structures with a beam. Capable of carrying 2x2 structures.
 unit.emanate.description = Builds structures to defend the Acropolis core. Repairs structures with beams. Capable of carrying 2x2 structures.
 
-lst.read = Read a number from a linked memory cell.
-lst.write = Write a number to a linked memory cell.
+lst.read = Read a number from a linked memory cell.\nCan also read from variables in other processors.
+lst.write = Write a number to a linked memory cell.\nCan also write to variables in other processors.
 lst.print = Add text to the print buffer.\nDoes not display anything until [accent]Print Flush[] is used.
 lst.printchar = Add a UTF-16 character or content icon to the print buffer.\nDoes not display anything until [accent]Print Flush[] is used.
 lst.format = Replace next placeholder in text buffer with a value.\nDoes not do anything if placeholder pattern is invalid.\nPlaceholder pattern: "{[accent]number 0-9[]}"\nExample:\n[accent]print "test {0}"\nformat "example"
@@ -2566,7 +2566,7 @@ laccess.size = Size of a unit/building or the length of a string.
 laccess.id = ID of a unit/block/item/liquid.\nThis is the inverse of the lookup operation.
 laccess.displaywidth = Width of a display block in pixels.
 laccess.displayheight = Height of a display block in pixels.
-laccess.bufferusage = Number of unprocessed commands in the graphics buffer of a display.
+laccess.bufferusage = Number of unprocessed commands in the graphics buffer of a display.\nLength of the content of a message.
 laccess.operations = Number of operations performed on the block.\nFor displays, returns the number of drawflush operations.
 
 lcategory.unknown = Unknown
diff --git a/core/src/mindustry/logic/LExecutor.java b/core/src/mindustry/logic/LExecutor.java
index 0609458a31..db4ad013ff 100644
--- a/core/src/mindustry/logic/LExecutor.java
+++ b/core/src/mindustry/logic/LExecutor.java
@@ -580,6 +580,8 @@ public class LExecutor{
                     output.numval = fromVar.numval;
                     output.isobj = fromVar.isobj;
                 }
+            }else if(from instanceof MessageBuild msg){
+                output.setnum(address < 0 || address >= msg.message.length() ? Double.NaN : (int)msg.message.charAt(address));
             }else if(target.isobj && target.objval instanceof CharSequence str){
                 output.setnum(address < 0 || address >= str.length() ? Double.NaN : (int)str.charAt(address));
             }else if(from instanceof CanvasBuild canvas && (exec.privileged || (from.team == exec.team))){
diff --git a/core/src/mindustry/world/blocks/logic/MessageBlock.java b/core/src/mindustry/world/blocks/logic/MessageBlock.java
index f00b7f2ce7..5f78145bdb 100644
--- a/core/src/mindustry/world/blocks/logic/MessageBlock.java
+++ b/core/src/mindustry/world/blocks/logic/MessageBlock.java
@@ -14,6 +14,7 @@ import arc.util.io.*;
 import arc.util.pooling.*;
 import mindustry.core.*;
 import mindustry.gen.*;
+import mindustry.logic.*;
 import mindustry.ui.*;
 import mindustry.ui.dialogs.*;
 import mindustry.world.*;
@@ -165,6 +166,14 @@ public class MessageBlock extends Block{
             return !accessible() ? SystemCursor.arrow : super.getCursor();
         }
 
+        @Override
+        public double sense(LAccess sensor){
+            return switch(sensor){
+                case bufferUsage -> message.length();
+                default -> super.sense(sensor);
+            };
+        }
+
         @Override
         public void damage(float damage){
             if(privileged) return;