Allow using command computers in survival mode

I'm really not a fan of this change, but it's gated behind a config
option and there's apparently sufficient demand that it's worthwhile.
Closes #442.

src/main/java/dan200/computercraft/ComputerCraft.java

@@ -112,7 +112,8 @@ public class ComputerCraft
     public static boolean disable_lua51_features = false;
     public static String default_computer_settings = "";
     public static boolean debug_enable = true;
-    public static boolean logPeripheralErrors = false;
+    public static boolean logPeripheralErrors = true;
+    public static boolean commandRequireCreative = true;
 
     public static int computer_threads = 1;
     public static long maxMainGlobalTime = TimeUnit.MILLISECONDS.toNanos( 10 );

src/main/java/dan200/computercraft/shared/Config.java

@@ -47,6 +47,7 @@ public final class Config
     private static Property defaultComputerSettings;
     private static Property debugEnabled;
     private static Property logComputerErrors;
+    private static Property commandRequireCreative;
 
     private static Property computerThreads;
     private static Property maxMainGlobalTime;
@@ -119,10 +120,14 @@ public final class Config
             logComputerErrors.setComment( "Log exceptions thrown by peripherals and other Lua objects.\n" +
                 "This makes it easier for mod authors to debug problems, but may result in log spam should people use buggy methods." );
 
+            commandRequireCreative = config.get( CATEGORY_GENERAL, "command_require_creative", ComputerCraft.commandRequireCreative );
+            commandRequireCreative.setComment( "Require players to be in creative mode and be opped in order to interact with command computers." +
+                "This is the default behaviour for vanilla's Command blocks." );
+
             setOrder(
                 CATEGORY_GENERAL,
                 computerSpaceLimit, floppySpaceLimit, maximumFilesOpen,
-                disableLua51Features, defaultComputerSettings, debugEnabled, logComputerErrors
+                disableLua51Features, defaultComputerSettings, debugEnabled, logComputerErrors, commandRequireCreative
             );
         }
 
@@ -441,6 +446,7 @@ public final class Config
         ComputerCraft.default_computer_settings = defaultComputerSettings.getString();
         ComputerCraft.debug_enable = debugEnabled.getBoolean();
         ComputerCraft.logPeripheralErrors = logComputerErrors.getBoolean();
+        ComputerCraft.commandRequireCreative = commandRequireCreative.getBoolean();
 
         // Execution
         ComputerCraft.computer_threads = computerThreads.getInt();

src/main/java/dan200/computercraft/shared/computer/blocks/TileCommandComputer.java

@@ -5,6 +5,7 @@
  */
 package dan200.computercraft.shared.computer.blocks;
 
+import dan200.computercraft.ComputerCraft;
 import dan200.computercraft.shared.computer.apis.CommandAPI;
 import dan200.computercraft.shared.computer.core.ServerComputer;
 import io.netty.buffer.ByteBuf;
@@ -167,6 +168,11 @@ public class TileCommandComputer extends TileComputer
 
     @Override
     public boolean isUsable( EntityPlayer player, boolean ignoreRange )
+    {
+        return isUsable( player ) && super.isUsable( player, ignoreRange );
+    }
+
+    public static boolean isUsable( EntityPlayer player )
     {
         MinecraftServer server = player.getServer();
         if( server == null || !server.isCommandBlockEnabled() )
@@ -174,14 +180,12 @@ public class TileCommandComputer extends TileComputer
             player.sendMessage( new TextComponentTranslation( "advMode.notEnabled" ) );
             return false;
         }
-        else if( !player.canUseCommandBlock() )
+        else if( ComputerCraft.commandRequireCreative ? !player.canUseCommandBlock() : !server.getPlayerList().canSendCommands( player.getGameProfile() ) )
         {
             player.sendMessage( new TextComponentTranslation( "advMode.notAllowed" ) );
             return false;
         }
-        else
+
-        {
+        return true;
-            return super.isUsable( player, ignoreRange );
-        }
     }
 }

src/main/java/dan200/computercraft/shared/computer/inventory/ContainerViewComputer.java

@@ -6,11 +6,10 @@
 package dan200.computercraft.shared.computer.inventory;
 
 import dan200.computercraft.ComputerCraft;
+import dan200.computercraft.shared.computer.blocks.TileCommandComputer;
 import dan200.computercraft.shared.computer.core.*;
 import net.minecraft.entity.player.EntityPlayer;
 import net.minecraft.inventory.Container;
-import net.minecraft.server.MinecraftServer;
-import net.minecraft.util.text.TextComponentTranslation;
 
 import javax.annotation.Nonnull;
 import javax.annotation.Nullable;
@@ -46,20 +45,10 @@ public class ContainerViewComputer extends Container implements IContainerComput
             }
 
             // If we're a command computer then ensure we're in creative
-            if( serverComputer.getFamily() == ComputerFamily.Command )
+            if( serverComputer.getFamily() == ComputerFamily.Command && !TileCommandComputer.isUsable( player ) )
             {
-                MinecraftServer server = player.getServer();
-                if( server == null || !server.isCommandBlockEnabled() )
-                {
-                    player.sendMessage( new TextComponentTranslation( "advMode.notEnabled" ) );
                 return false;
             }
-                else if( !player.canUseCommandBlock() )
-                {
-                    player.sendMessage( new TextComponentTranslation( "advMode.notAllowed" ) );
-                    return false;
-                }
-            }
         }
 
         return true;

src/main/resources/assets/computercraft/lang/en_us.lang

@@ -159,6 +159,7 @@ gui.computercraft:config.disable_lua51_features=Disable Lua 5.1 features
 gui.computercraft:config.default_computer_settings=Default Computer settings
 gui.computercraft:config.debug_enabled=Enable debug library
 gui.computercraft:config.log_computer_errors=Log computer errors
+gui.computercraft:config.command_require_creative=Command computers require creative
 
 gui.computercraft:config.execution=Execution
 gui.computercraft:config.execution.computer_threads=Computer threads