Bump version

- Remove redundant preservation of cobalt lib constructors. We use
   lambdas now, so this is no longer needed.
 - Fix Java crypto lib not being included.

.editorconfig

@@ -11,5 +11,8 @@ insert_final_newline = true
 [*.md]
 trim_trailing_whitespace = false
 
+[*.sexp]
+indent_size = 2
+
 [*.properties]
 insert_final_newline = false

.github/workflows/main-ci.yml

@@ -4,6 +4,7 @@ on: [push, pull_request]
 
 jobs:
   build:
+    name: Build
     runs-on: ubuntu-latest
 
     steps:
@@ -16,3 +17,17 @@ jobs:
 
     - name: Build with Gradle
       run: ./gradlew build --no-daemon
+
+  lint-lua:
+    name: Lint Lua
+    runs-on: ubuntu-latest
+
+    steps:
+    - uses: actions/checkout@v1
+
+    - name: Lint Lua code
+      run: |
+        test -d bin || mkdir bin
+        test -f bin/illuaminate || wget -q -Obin/illuaminate https://squiddev.cc/illuaminate/bin/illuaminate
+        chmod +x bin/illuaminate
+        bin/illuaminate lint

.luacheckrc

@@ -1,35 +0,0 @@
-std = "max"
-
-ignore = {
-    -- Allow access to undefined globals or their fields. In the future we'll
-    -- define all of CC's globals within this file
-    '113', '143',
-
-    -- FIXME: Ignore unused arguments and loop variables
-    '212', '213',
-
-    -- Disable line is too long for now. It would be possible to clean
-    -- this up in the future.
-    '631',
-}
-
--- Only run the linter on ROM and bios for now, as the treasure disks
--- are largely unsupported.
-include_files = {
-    'src/main/resources/assets/computercraft/lua/rom',
-    'src/main/resources/assets/computercraft/lua/bios.lua',
-    'src/test/resources/test-rom',
-}
-
-files['src/main/resources/assets/computercraft/lua/bios.lua'] = {
-    -- Allow declaring and mutating globals
-    allow_defined_top = true,
-    ignore = { '112', '121', '122', '131', '142' },
-}
-
-files['src/main/resources/assets/computercraft/lua/rom/apis'] = {
-    -- APIs may define globals on the top level. We'll ignore unused globals,
-    -- as obviously they may be used outside that API.
-    allow_defined_top = true,
-    ignore = { '131' },
-}

build.gradle

@@ -59,6 +59,10 @@ repositories {
         name "Amadornes"
         url "https://maven.amadornes.com/"
     }
+    maven {
+        name "CraftTweaker"
+        url "https://maven.blamejared.com/"
+    }
 }
 
 configurations {
@@ -70,9 +74,10 @@ configurations {
 dependencies {
     checkstyle "com.puppycrawl.tools:checkstyle:8.25"
 
+    deobfProvided "CraftTweaker2:CraftTweaker2-MC1120-Main:1.12-4.1.20.554"
+    deobfProvided "MCMultiPart2:MCMultiPart:2.5.3"
     deobfProvided "mezz.jei:jei_1.12.2:4.15.0.269:api"
     deobfProvided "pl.asie:Charset-Lib:0.5.4.6"
-    deobfProvided "MCMultiPart2:MCMultiPart:2.5.3"
 
     runtime "mezz.jei:jei_1.12.2:4.15.0.269"
 
@@ -132,6 +137,7 @@ task proguard(type: ProGuardTask, dependsOn: jar) {
 
     // Add the main runtime jar and all non-shadowed dependencies
     libraryjars "${System.getProperty('java.home')}/lib/rt.jar"
+    libraryjars "${System.getProperty('java.home')}/lib/jce.jar"
     doFirst {
         sourceSets.main.compileClasspath
             .filter { !it.name.contains("Cobalt") }
@@ -146,9 +152,6 @@ task proguard(type: ProGuardTask, dependsOn: jar) {
 
     // Preserve ComputerCraft classes - we only want to strip shadowed files.
     keep 'class dan200.computercraft.** { *; }'
-
-    // Preserve the constructors in Cobalt library class, as we init them via reflection
-    keepclassmembers 'class org.squiddev.cobalt.lib.** { <init>(...); }'
 }
 
 task proguardMove(dependsOn: proguard) {

gradle.properties

@@ -1,5 +1,5 @@
 # Mod properties
-mod_version=1.85.0
+mod_version=1.86.0
 
 # Minecraft properties
 mc_version=1.12.2

illuaminate.sexp

@@ -0,0 +1,28 @@
+; -*- mode: Lisp;-*-
+
+(sources
+  /src/main/resources/assets/computercraft/lua/bios.lua
+  /src/main/resources/assets/computercraft/lua/rom/
+  /src/test/resources/test-rom)
+
+(at /
+  (linters
+    ;; It'd be nice to avoid this, but right now there's a lot of instances of
+    ;; it.
+    -var:set-loop
+
+    ;; It's useful to name arguments for documentation, so we allow this. It'd
+    ;; be good to find a compromise in the future, but this works for now.
+    -var:unused-arg))
+
+;; We disable the unused global linter in bios.lua and the APIs. In the future
+;; hopefully we'll get illuaminate to handle this.
+(at
+  (/src/main/resources/assets/computercraft/lua/bios.lua
+   /src/main/resources/assets/computercraft/lua/rom/apis/)
+  (linters -var:unused-global)
+  (lint
+    (allow-toplevel-global true)))
+
+;; These warnings are broken right now
+(at (bios.lua worm.lua) (linters -control:unreachable))

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

@@ -54,8 +54,8 @@ public final class Config
 
     private static Property httpEnable;
     private static Property httpWebsocketEnable;
-    private static Property httpWhitelist;
-    private static Property httpBlacklist;
+    private static Property httpAllowedDomains;
+    private static Property httpBlockedDomains;
 
     private static Property httpTimeout;
     private static Property httpMaxRequests;
@@ -163,30 +163,32 @@ public final class Config
         { // HTTP
             renameProperty( CATEGORY_GENERAL, "http_enable", CATEGORY_HTTP, "enabled" );
             renameProperty( CATEGORY_GENERAL, "http_websocket_enable", CATEGORY_HTTP, "websocket_enabled" );
-            renameProperty( CATEGORY_GENERAL, "http_whitelist", CATEGORY_HTTP, "whitelist" );
-            renameProperty( CATEGORY_GENERAL, "http_blacklist", CATEGORY_HTTP, "blacklist" );
+            renameProperty( CATEGORY_GENERAL, "http_whitelist", CATEGORY_HTTP, "allowed_domains" );
+            renameProperty( CATEGORY_GENERAL, "http_blacklist", CATEGORY_HTTP, "blocked_domains" );
+            renameProperty( CATEGORY_HTTP, "whitelist", CATEGORY_HTTP, "allowed_domains" );
+            renameProperty( CATEGORY_HTTP, "blacklist", CATEGORY_HTTP, "blocked_domains" );
 
             config.getCategory( CATEGORY_HTTP )
                 .setComment( "Controls the HTTP API" );
 
             httpEnable = config.get( CATEGORY_HTTP, "enabled", ComputerCraft.http_enable );
-            httpEnable.setComment( "Enable the \"http\" API on Computers (see \"http_whitelist\" and \"http_blacklist\" for " +
-                "more fine grained control than this)" );
+            httpEnable.setComment( "Enable the \"http\" API on Computers (see \"allowed_domains\" and \"blocked_domains\" " +
+                "for more fine grained control than this)" );
 
             httpWebsocketEnable = config.get( CATEGORY_HTTP, "websocket_enabled", ComputerCraft.http_websocket_enable );
             httpWebsocketEnable.setComment( "Enable use of http websockets. This requires the \"http_enable\" option to also be true." );
 
-            httpWhitelist = config.get( CATEGORY_HTTP, "whitelist", DEFAULT_HTTP_WHITELIST );
-            httpWhitelist.setComment( "A list of wildcards for domains or IP ranges that can be accessed through the " +
+            httpAllowedDomains = config.get( CATEGORY_HTTP, "allowed_domains", DEFAULT_HTTP_WHITELIST );
+            httpAllowedDomains.setComment( "A list of wildcards for domains or IP ranges that can be accessed through the " +
                 "\"http\" API on Computers.\n" +
                 "Set this to \"*\" to access to the entire internet. Example: \"*.pastebin.com\" will restrict access to " +
                 "just subdomains of pastebin.com.\n" +
                 "You can use domain names (\"pastebin.com\"), wilcards (\"*.pastebin.com\") or CIDR notation (\"127.0.0.0/8\")." );
 
-            httpBlacklist = config.get( CATEGORY_HTTP, "blacklist", DEFAULT_HTTP_BLACKLIST );
-            httpBlacklist.setComment( "A list of wildcards for domains or IP ranges that cannot be accessed through the " +
+            httpBlockedDomains = config.get( CATEGORY_HTTP, "blocked_domains", DEFAULT_HTTP_BLACKLIST );
+            httpBlockedDomains.setComment( "A list of wildcards for domains or IP ranges that cannot be accessed through the " +
                 "\"http\" API on Computers.\n" +
-                "If this is empty then all whitelisted domains will be accessible. Example: \"*.github.com\" will block " +
+                "If this is empty then all explicitly allowed domains will be accessible. Example: \"*.github.com\" will block " +
                 "access to all subdomains of github.com.\n" +
                 "You can use domain names (\"pastebin.com\"), wilcards (\"*.pastebin.com\") or CIDR notation (\"127.0.0.0/8\")." );
 
@@ -220,7 +222,7 @@ public final class Config
 
             setOrder(
                 CATEGORY_HTTP,
-                httpEnable, httpWebsocketEnable, httpWhitelist, httpBlacklist,
+                httpEnable, httpWebsocketEnable, httpAllowedDomains, httpBlockedDomains,
                 httpTimeout, httpMaxRequests, httpMaxDownload, httpMaxUpload, httpMaxWebsockets, httpMaxWebsocketMessage
             );
         }
@@ -441,8 +443,8 @@ public final class Config
         // HTTP
         ComputerCraft.http_enable = httpEnable.getBoolean();
         ComputerCraft.http_websocket_enable = httpWebsocketEnable.getBoolean();
-        ComputerCraft.http_whitelist = new AddressPredicate( httpWhitelist.getStringList() );
-        ComputerCraft.http_blacklist = new AddressPredicate( httpBlacklist.getStringList() );
+        ComputerCraft.http_whitelist = new AddressPredicate( httpAllowedDomains.getStringList() );
+        ComputerCraft.http_blacklist = new AddressPredicate( httpBlockedDomains.getStringList() );
 
         ComputerCraft.httpTimeout = Math.max( 0, httpTimeout.getInt() );
         ComputerCraft.httpMaxRequests = Math.max( 1, httpMaxRequests.getInt() );

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

@@ -19,12 +19,35 @@ import net.minecraftforge.fml.common.ModContainer;
 import javax.annotation.Nonnull;
 import javax.annotation.Nullable;
 import java.util.*;
+import java.util.stream.Stream;
 
 public final class TurtleUpgrades
 {
+    public static class Wrapper
+    {
+        final ITurtleUpgrade upgrade;
+        final int legacyId;
+        final String id;
+        final String modId;
+        boolean enabled;
+
+        public Wrapper( ITurtleUpgrade upgrade )
+        {
+            ModContainer mc = Loader.instance().activeModContainer();
+
+            this.upgrade = upgrade;
+            this.legacyId = upgrade.getLegacyUpgradeID();
+            this.id = upgrade.getUpgradeID().toString();
+            this.modId = mc != null && mc.getModId() != null ? mc.getModId() : null;
+            this.enabled = true;
+        }
+    }
+
+    private static ITurtleUpgrade[] vanilla;
+
     private static final Map<String, ITurtleUpgrade> upgrades = new HashMap<>();
     private static final Int2ObjectMap<ITurtleUpgrade> legacyUpgrades = new Int2ObjectOpenHashMap<>();
-    private static final IdentityHashMap<ITurtleUpgrade, String> upgradeOwners = new IdentityHashMap<>();
+    private static final IdentityHashMap<ITurtleUpgrade, Wrapper> wrappers = new IdentityHashMap<>();
 
     private TurtleUpgrades() {}
 
@@ -35,9 +58,7 @@ public final class TurtleUpgrades
         int id = upgrade.getLegacyUpgradeID();
         if( id >= 0 && id < 64 )
         {
-            String message = getMessage( upgrade, "Legacy UpgradeID '" + id + "' is reserved by ComputerCraft" );
-            ComputerCraft.log.error( message );
-            throw new RuntimeException( message );
+            throw registrationError( upgrade, "Legacy Upgrade ID '" + id + "' is reserved by ComputerCraft" );
         }
 
         registerInternal( upgrade );
@@ -47,58 +68,63 @@ public final class TurtleUpgrades
     {
         Objects.requireNonNull( upgrade, "upgrade cannot be null" );
 
+        Wrapper wrapper = new Wrapper( upgrade );
+
         // Check conditions
-        int legacyId = upgrade.getLegacyUpgradeID();
+        int legacyId = wrapper.legacyId;
         if( legacyId >= 0 )
         {
             if( legacyId >= Short.MAX_VALUE )
             {
-                String message = getMessage( upgrade, "UpgradeID '" + legacyId + "' is out of range" );
-                ComputerCraft.log.error( message );
-                throw new RuntimeException( message );
+                throw registrationError( upgrade, "Upgrade ID '" + legacyId + "' is out of range" );
             }
 
             ITurtleUpgrade existing = legacyUpgrades.get( legacyId );
             if( existing != null )
             {
-                String message = getMessage( upgrade, "UpgradeID '" + legacyId + "' is already registered by '" + existing.getUnlocalisedAdjective() + " Turtle'" );
-                ComputerCraft.log.error( message );
-                throw new RuntimeException( message );
+                throw registrationError( upgrade, "Upgrade ID '" + legacyId + "' is already registered by '" + existing.getUnlocalisedAdjective() + " Turtle'" );
             }
         }
 
-        String id = upgrade.getUpgradeID().toString();
+        String id = wrapper.id;
         ITurtleUpgrade existing = upgrades.get( id );
         if( existing != null )
         {
-            String message = getMessage( upgrade, "UpgradeID '" + id + "' is already registered by '" + existing.getUnlocalisedAdjective() + " Turtle'" );
-            ComputerCraft.log.error( message );
-            throw new RuntimeException( message );
+            throw registrationError( upgrade, "Upgrade '" + id + "' is already registered by '" + existing.getUnlocalisedAdjective() + " Turtle'" );
         }
 
         // Register
         if( legacyId >= 0 ) legacyUpgrades.put( legacyId, upgrade );
         upgrades.put( id, upgrade );
-
-        ModContainer mc = Loader.instance().activeModContainer();
-        if( mc != null && mc.getModId() != null ) upgradeOwners.put( upgrade, mc.getModId() );
+        wrappers.put( upgrade, wrapper );
     }
 
-    private static String getMessage( ITurtleUpgrade upgrade, String rest )
+    private static RuntimeException registrationError( ITurtleUpgrade upgrade, String rest )
     {
-        return "Error registering '" + upgrade.getUnlocalisedAdjective() + " Turtle'. " + rest;
+        String message = "Error registering '" + upgrade.getUnlocalisedAdjective() + " Turtle'. " + rest;
+        ComputerCraft.log.error( message );
+        throw new IllegalArgumentException( message );
     }
 
+    @Nullable
     public static ITurtleUpgrade get( String id )
     {
         return upgrades.get( id );
     }
 
+    @Nullable
     public static ITurtleUpgrade get( int id )
     {
         return legacyUpgrades.get( id );
     }
 
+    @Nullable
+    public static String getOwner( @Nonnull ITurtleUpgrade upgrade )
+    {
+        Wrapper wrapper = wrappers.get( upgrade );
+        return wrapper != null ? wrapper.modId : null;
+    }
+
     public static ITurtleUpgrade get( @Nonnull ItemStack stack )
     {
         if( stack.isEmpty() ) return null;
@@ -115,25 +141,24 @@ public final class TurtleUpgrades
         return null;
     }
 
-    public static Iterable<ITurtleUpgrade> getVanillaUpgrades()
+    public static Stream<ITurtleUpgrade> getVanillaUpgrades()
     {
-        List<ITurtleUpgrade> vanilla = new ArrayList<>();
-        vanilla.add( ComputerCraft.TurtleUpgrades.diamondPickaxe );
-        vanilla.add( ComputerCraft.TurtleUpgrades.diamondAxe );
-        vanilla.add( ComputerCraft.TurtleUpgrades.diamondSword );
-        vanilla.add( ComputerCraft.TurtleUpgrades.diamondShovel );
-        vanilla.add( ComputerCraft.TurtleUpgrades.diamondHoe );
-        vanilla.add( ComputerCraft.TurtleUpgrades.craftingTable );
-        vanilla.add( ComputerCraft.TurtleUpgrades.wirelessModem );
-        vanilla.add( ComputerCraft.TurtleUpgrades.advancedModem );
-        vanilla.add( ComputerCraft.TurtleUpgrades.speaker );
-        return vanilla;
+        if( vanilla == null )
+        {
+            vanilla = new ITurtleUpgrade[] {
+                ComputerCraft.TurtleUpgrades.diamondPickaxe,
+                ComputerCraft.TurtleUpgrades.diamondAxe,
+                ComputerCraft.TurtleUpgrades.diamondSword,
+                ComputerCraft.TurtleUpgrades.diamondShovel,
+                ComputerCraft.TurtleUpgrades.diamondHoe,
+                ComputerCraft.TurtleUpgrades.craftingTable,
+                ComputerCraft.TurtleUpgrades.wirelessModem,
+                ComputerCraft.TurtleUpgrades.advancedModem,
+                ComputerCraft.TurtleUpgrades.speaker,
+            };
         }
 
-    @Nullable
-    public static String getOwner( @Nonnull ITurtleUpgrade upgrade )
-    {
-        return upgradeOwners.get( upgrade );
+        return Arrays.stream( vanilla ).filter( x -> x != null && wrappers.get( x ).enabled );
     }
 
     public static Iterable<ITurtleUpgrade> getUpgrades()
@@ -145,4 +170,14 @@ public final class TurtleUpgrades
     {
         return true;
     }
+
+    public static void disable( ITurtleUpgrade upgrade )
+    {
+        Wrapper wrapper = wrappers.get( upgrade );
+        if( !wrapper.enabled ) return;
+
+        wrapper.enabled = false;
+        upgrades.remove( wrapper.id );
+        if( wrapper.legacyId >= 0 ) legacyUpgrades.remove( wrapper.legacyId );
+    }
 }

src/main/java/dan200/computercraft/shared/integration/crafttweaker/TurtleTweaker.java

@@ -0,0 +1,70 @@
+/*
+ * This file is part of ComputerCraft - http://www.computercraft.info
+ * Copyright Daniel Ratcliffe, 2011-2019. Do not distribute without permission.
+ * Send enquiries to dratcliffe@gmail.com
+ */
+
+package dan200.computercraft.shared.integration.crafttweaker;
+
+import crafttweaker.CraftTweakerAPI;
+import crafttweaker.annotations.ModOnly;
+import crafttweaker.annotations.ZenDoc;
+import crafttweaker.annotations.ZenRegister;
+import crafttweaker.api.item.IItemStack;
+import crafttweaker.api.minecraft.CraftTweakerMC;
+import dan200.computercraft.ComputerCraft;
+import dan200.computercraft.shared.integration.crafttweaker.actions.AddTurtleTool;
+import dan200.computercraft.shared.integration.crafttweaker.actions.RemoveTurtleUpgradeByItem;
+import dan200.computercraft.shared.integration.crafttweaker.actions.RemoveTurtleUpgradeByName;
+import stanhebben.zenscript.annotations.ZenClass;
+import stanhebben.zenscript.annotations.ZenMethod;
+
+@ZenRegister
+@ZenClass( "dan200.computercraft.turtle" )
+@ModOnly( ComputerCraft.MOD_ID )
+public class TurtleTweaker
+{
+    @ZenMethod
+    @ZenDoc( "Remove a turtle upgrade with the given id" )
+    public static void removeUpgrade( String upgrade )
+    {
+        CraftTweakerAPI.apply( new RemoveTurtleUpgradeByName( upgrade ) );
+    }
+
+    @ZenMethod
+    @ZenDoc( "Remove a turtle upgrade crafted with the given item stack" )
+    public static void removeUpgrade( IItemStack stack )
+    {
+        CraftTweakerAPI.apply( new RemoveTurtleUpgradeByItem( CraftTweakerMC.getItemStack( stack ) ) );
+    }
+
+    @ZenMethod
+    @ZenDoc( "Add a new turtle tool with the given id, which crafts and acts using the given stack." )
+    public static void addTool( String id, IItemStack stack )
+    {
+        addTool( id, stack, stack, "tool" );
+    }
+
+    @ZenMethod
+    @ZenDoc( "Add a new turtle tool with the given id, which is crafted with one item, and uses another." )
+    public static void addTool( String id, IItemStack craftingStack, IItemStack toolStack )
+    {
+        addTool( id, craftingStack, toolStack, "tool" );
+    }
+
+    @ZenMethod
+    @ZenDoc( "Add a new turtle tool with the given id, which crafts and acts using the given stack. You may also" +
+        "specify a 'kind' of tool, which limits what blocks the turtle can break (for instance, an 'axe' may only break wood)." )
+    public static void addTool( String id, IItemStack stack, String kind )
+    {
+        addTool( id, stack, stack, kind );
+    }
+
+    @ZenMethod
+    @ZenDoc( "Add a new turtle tool with the given id, which is crafted with one item, and uses another. You may also" +
+        "specify a 'kind' of tool, which limits what blocks the turtle can break (for instance, an 'axe' may only break wood)." )
+    public static void addTool( String id, IItemStack craftingStack, IItemStack toolStack, String kind )
+    {
+        CraftTweakerAPI.apply( new AddTurtleTool( id, CraftTweakerMC.getItemStack( craftingStack ), CraftTweakerMC.getItemStack( toolStack ), kind ) );
+    }
+}

src/main/java/dan200/computercraft/shared/integration/crafttweaker/actions/AddTurtleTool.java

@@ -0,0 +1,96 @@
+/*
+ * This file is part of ComputerCraft - http://www.computercraft.info
+ * Copyright Daniel Ratcliffe, 2011-2019. Do not distribute without permission.
+ * Send enquiries to dratcliffe@gmail.com
+ */
+
+package dan200.computercraft.shared.integration.crafttweaker.actions;
+
+import dan200.computercraft.ComputerCraft;
+import dan200.computercraft.shared.TurtleUpgrades;
+import dan200.computercraft.shared.turtle.upgrades.*;
+import net.minecraft.item.ItemStack;
+import net.minecraft.util.ResourceLocation;
+
+import java.util.HashMap;
+import java.util.Map;
+import java.util.Optional;
+
+/**
+ * Register a new turtle tool.
+ */
+public class AddTurtleTool implements IAction
+{
+    private interface Factory
+    {
+        TurtleTool create( ResourceLocation location, ItemStack craftItem, ItemStack toolItem );
+    }
+
+    private static final Map<String, Factory> kinds = new HashMap<>();
+
+    static
+    {
+        kinds.put( "tool", TurtleTool::new );
+        kinds.put( "axe", TurtleAxe::new );
+        kinds.put( "hoe", TurtleHoe::new );
+        kinds.put( "shovel", TurtleShovel::new );
+        kinds.put( "sword", TurtleSword::new );
+    }
+
+    private final String id;
+    private final ItemStack craftItem;
+    private final ItemStack toolItem;
+    private final String kind;
+
+    public AddTurtleTool( String id, ItemStack craftItem, ItemStack toolItem, String kind )
+    {
+        this.id = id;
+        this.craftItem = craftItem;
+        this.toolItem = toolItem;
+        this.kind = kind;
+    }
+
+    @Override
+    public void apply()
+    {
+        Factory factory = kinds.get( kind );
+        if( factory == null )
+        {
+            ComputerCraft.log.error( "Unknown turtle upgrade kind '{}' (this should have been rejected by verify!)", kind );
+            return;
+        }
+
+        try
+        {
+            TurtleUpgrades.register( factory.create( new ResourceLocation( id ), craftItem, toolItem ) );
+        }
+        catch( RuntimeException e )
+        {
+            ComputerCraft.log.error( "Registration of turtle tool failed", e );
+        }
+    }
+
+    @Override
+    public String describe()
+    {
+        return String.format( "Add new turtle %s '%s' (crafted with '%s', uses a '%s')", kind, id, craftItem, toolItem );
+    }
+
+    public Optional<String> getValidationProblem()
+    {
+        if( craftItem.isEmpty() ) return Optional.of( "Crafting item stack is empty." );
+        if( craftItem.hasTagCompound() && !craftItem.getTagCompound().isEmpty() )
+        {
+            return Optional.of( "Crafting item has NBT." );
+        }
+        if( toolItem.isEmpty() ) return Optional.of( "Tool item stack is empty." );
+        if( !kinds.containsKey( kind ) ) return Optional.of( String.format( "Unknown kind '%s'.", kind ) );
+
+        if( TurtleUpgrades.get( id ) != null )
+        {
+            return Optional.of( String.format( "An upgrade with the same name ('%s') has already been registered.", id ) );
+        }
+
+        return Optional.empty();
+    }
+}

src/main/java/dan200/computercraft/shared/integration/crafttweaker/actions/IAction.java

@@ -0,0 +1,32 @@
+/*
+ * This file is part of ComputerCraft - http://www.computercraft.info
+ * Copyright Daniel Ratcliffe, 2011-2019. Do not distribute without permission.
+ * Send enquiries to dratcliffe@gmail.com
+ */
+
+package dan200.computercraft.shared.integration.crafttweaker.actions;
+
+import java.util.Optional;
+
+/**
+ * An extension of {@link IAction} with a single validation function, rather than two.
+ */
+public interface IAction extends crafttweaker.IAction
+{
+    default Optional<String> getValidationProblem()
+    {
+        return Optional.empty();
+    }
+
+    @Override
+    default boolean validate()
+    {
+        return !getValidationProblem().isPresent();
+    }
+
+    @Override
+    default String describeInvalid()
+    {
+        return getValidationProblem().orElse( "No problems found." );
+    }
+}

src/main/java/dan200/computercraft/shared/integration/crafttweaker/actions/RemoveTurtleUpgradeByItem.java

@@ -0,0 +1,50 @@
+/*
+ * This file is part of ComputerCraft - http://www.computercraft.info
+ * Copyright Daniel Ratcliffe, 2011-2019. Do not distribute without permission.
+ * Send enquiries to dratcliffe@gmail.com
+ */
+
+package dan200.computercraft.shared.integration.crafttweaker.actions;
+
+import dan200.computercraft.api.turtle.ITurtleUpgrade;
+import dan200.computercraft.shared.TurtleUpgrades;
+import net.minecraft.item.ItemStack;
+
+import java.util.Optional;
+
+/**
+ * Removes a turtle upgrade crafted with the given stack.
+ */
+public class RemoveTurtleUpgradeByItem implements IAction
+{
+    private final ItemStack stack;
+
+    public RemoveTurtleUpgradeByItem( ItemStack stack )
+    {
+        this.stack = stack;
+    }
+
+    @Override
+    public void apply()
+    {
+        ITurtleUpgrade upgrade = TurtleUpgrades.get( stack );
+        if( upgrade != null ) TurtleUpgrades.disable( upgrade );
+    }
+
+    @Override
+    public String describe()
+    {
+        return String.format( "Remove turtle upgrades crafted with '%s'", stack );
+    }
+
+    @Override
+    public Optional<String> getValidationProblem()
+    {
+        if( TurtleUpgrades.get( stack ) == null )
+        {
+            return Optional.of( String.format( "Unknown turtle upgrade crafted with '%s'.", stack ) );
+        }
+
+        return Optional.empty();
+    }
+}

src/main/java/dan200/computercraft/shared/integration/crafttweaker/actions/RemoveTurtleUpgradeByName.java

@@ -0,0 +1,49 @@
+/*
+ * This file is part of ComputerCraft - http://www.computercraft.info
+ * Copyright Daniel Ratcliffe, 2011-2019. Do not distribute without permission.
+ * Send enquiries to dratcliffe@gmail.com
+ */
+
+package dan200.computercraft.shared.integration.crafttweaker.actions;
+
+import dan200.computercraft.api.turtle.ITurtleUpgrade;
+import dan200.computercraft.shared.TurtleUpgrades;
+
+import java.util.Optional;
+
+/**
+ * Removes a turtle upgrade with the given id.
+ */
+public class RemoveTurtleUpgradeByName implements IAction
+{
+    private final String id;
+
+    public RemoveTurtleUpgradeByName( String id )
+    {
+        this.id = id;
+    }
+
+    @Override
+    public void apply()
+    {
+        ITurtleUpgrade upgrade = TurtleUpgrades.get( id );
+        if( upgrade != null ) TurtleUpgrades.disable( upgrade );
+    }
+
+    @Override
+    public String describe()
+    {
+        return String.format( "Remove turtle upgrade '%s'", id );
+    }
+
+    @Override
+    public Optional<String> getValidationProblem()
+    {
+        if( TurtleUpgrades.get( id ) == null )
+        {
+            return Optional.of( String.format( "Unknown turtle upgrade '%s'.", id ) );
+        }
+
+        return Optional.empty();
+    }
+}

src/main/java/dan200/computercraft/shared/turtle/core/TurtlePlayer.java

@@ -8,6 +8,7 @@ package dan200.computercraft.shared.turtle.core;
 
 import com.mojang.authlib.GameProfile;
 import dan200.computercraft.api.turtle.ITurtleAccess;
+import dan200.computercraft.shared.util.FakeNetHandler;
 import dan200.computercraft.shared.util.InventoryUtil;
 import dan200.computercraft.shared.util.WorldUtil;
 import net.minecraft.entity.Entity;
@@ -46,11 +47,13 @@ public class TurtlePlayer extends FakePlayer
     public TurtlePlayer( World world )
     {
         super( (WorldServer) world, DEFAULT_PROFILE );
+        connection = new FakeNetHandler( this );
     }
 
     private TurtlePlayer( ITurtleAccess turtle )
     {
         super( (WorldServer) turtle.getWorld(), getProfile( turtle.getOwningPlayer() ) );
+        connection = new FakeNetHandler( this );
         setState( turtle );
     }
 

src/main/java/dan200/computercraft/shared/turtle/items/ItemTurtleBase.java

@@ -48,13 +48,11 @@ public abstract class ItemTurtleBase extends ItemComputerBase implements ITurtle
         ItemStack normalStack = TurtleItemFactory.create( -1, null, -1, family, null, null, 0, null );
         if( !normalStack.isEmpty() && normalStack.getItem() == this ) list.add( normalStack );
 
-        for( ITurtleUpgrade upgrade : TurtleUpgrades.getVanillaUpgrades() )
-        {
-            if( !TurtleUpgrades.suitableForFamily( family, upgrade ) ) continue;
-
-            ItemStack stack = TurtleItemFactory.create( -1, null, -1, family, null, upgrade, 0, null );
-            if( !stack.isEmpty() && stack.getItem() == this ) list.add( stack );
-        }
+        TurtleUpgrades.getVanillaUpgrades()
+            .filter( x -> TurtleUpgrades.suitableForFamily( family, x ) )
+            .map( x -> TurtleItemFactory.create( -1, null, -1, family, null, x, 0, null ) )
+            .filter( x -> !x.isEmpty() && x.getItem() == this )
+            .forEach( list::add );
     }
 
     @Nonnull

src/main/java/dan200/computercraft/shared/turtle/upgrades/TurtleAxe.java

@@ -7,6 +7,7 @@
 package dan200.computercraft.shared.turtle.upgrades;
 
 import net.minecraft.item.Item;
+import net.minecraft.item.ItemStack;
 import net.minecraft.util.ResourceLocation;
 
 public class TurtleAxe extends TurtleTool
@@ -21,6 +22,11 @@ public class TurtleAxe extends TurtleTool
         super( id, legacyId, item );
     }
 
+    public TurtleAxe( ResourceLocation id, ItemStack craftItem, ItemStack toolItem )
+    {
+        super( id, craftItem, toolItem );
+    }
+
     @Override
     protected float getDamageMultiplier()
     {

src/main/java/dan200/computercraft/shared/turtle/upgrades/TurtleHoe.java

@@ -35,6 +35,11 @@ public class TurtleHoe extends TurtleTool
         super( id, legacyId, item );
     }
 
+    public TurtleHoe( ResourceLocation id, ItemStack craftItem, ItemStack toolItem )
+    {
+        super( id, craftItem, toolItem );
+    }
+
     @Override
     protected boolean canBreakBlock( IBlockState state, World world, BlockPos pos, TurtlePlayer player )
     {

src/main/java/dan200/computercraft/shared/turtle/upgrades/TurtleShovel.java

@@ -35,6 +35,11 @@ public class TurtleShovel extends TurtleTool
         super( id, legacyId, item );
     }
 
+    public TurtleShovel( ResourceLocation id, ItemStack craftItem, ItemStack toolItem )
+    {
+        super( id, craftItem, toolItem );
+    }
+
     @Override
     protected boolean canBreakBlock( IBlockState state, World world, BlockPos pos, TurtlePlayer player )
     {

src/main/java/dan200/computercraft/shared/turtle/upgrades/TurtleSword.java

@@ -10,6 +10,7 @@ import dan200.computercraft.shared.turtle.core.TurtlePlayer;
 import net.minecraft.block.material.Material;
 import net.minecraft.block.state.IBlockState;
 import net.minecraft.item.Item;
+import net.minecraft.item.ItemStack;
 import net.minecraft.util.ResourceLocation;
 import net.minecraft.util.math.BlockPos;
 import net.minecraft.world.World;
@@ -26,6 +27,11 @@ public class TurtleSword extends TurtleTool
         super( id, legacyId, item );
     }
 
+    public TurtleSword( ResourceLocation id, ItemStack craftItem, ItemStack toolItem )
+    {
+        super( id, craftItem, toolItem );
+    }
+
     @Override
     protected boolean canBreakBlock( IBlockState state, World world, BlockPos pos, TurtlePlayer player )
     {

src/main/java/dan200/computercraft/shared/turtle/upgrades/TurtleTool.java

@@ -62,6 +62,12 @@ public class TurtleTool extends AbstractTurtleUpgrade
         this.item = new ItemStack( item, 1, 0 );
     }
 
+    public TurtleTool( ResourceLocation id, ItemStack craftItem, ItemStack toolItem )
+    {
+        super( id, -1, TurtleUpgradeType.Tool, craftItem );
+        this.item = toolItem;
+    }
+
     @Nonnull
     @Override
     @SideOnly( Side.CLIENT )
@@ -76,7 +82,7 @@ public class TurtleTool extends AbstractTurtleUpgrade
         );
         Minecraft mc = Minecraft.getMinecraft();
         return Pair.of(
-            mc.getRenderItem().getItemModelMesher().getItemModel( item ),
+            mc.getRenderItem().getItemModelMesher().getItemModel( getCraftingItem() ),
             transform
         );
     }

src/main/java/dan200/computercraft/shared/util/FakeNetHandler.java

@@ -0,0 +1,234 @@
+/*
+ * This file is part of ComputerCraft - http://www.computercraft.info
+ * Copyright Daniel Ratcliffe, 2011-2019. Do not distribute without permission.
+ * Send enquiries to dratcliffe@gmail.com
+ */
+
+package dan200.computercraft.shared.util;
+
+import io.netty.channel.Channel;
+import io.netty.channel.ChannelHandlerContext;
+import net.minecraft.network.*;
+import net.minecraft.network.play.client.*;
+import net.minecraft.server.MinecraftServer;
+import net.minecraft.util.text.ITextComponent;
+import net.minecraftforge.common.util.FakePlayer;
+
+import javax.annotation.Nonnull;
+import javax.crypto.SecretKey;
+
+public class FakeNetHandler extends NetHandlerPlayServer
+{
+    public static class FakeNetworkManager extends NetworkManager
+    {
+        private INetHandler handler;
+
+        public FakeNetworkManager()
+        {
+            super( EnumPacketDirection.CLIENTBOUND );
+        }
+
+        @Override
+        public void channelActive( ChannelHandlerContext context )
+        {
+        }
+
+        @Override
+        public void setConnectionState( @Nonnull EnumConnectionState state )
+        {
+        }
+
+        @Override
+        public void channelInactive( ChannelHandlerContext context )
+        {
+        }
+
+        @Override
+        public void exceptionCaught( ChannelHandlerContext context, @Nonnull Throwable e )
+        {
+        }
+
+        @Override
+        public void setNetHandler( INetHandler handler )
+        {
+            this.handler = handler;
+        }
+
+        @Override
+        public void processReceivedPackets()
+        {
+        }
+
+        @Override
+        public void closeChannel( @Nonnull ITextComponent channel )
+        {
+        }
+
+        @Override
+        public boolean isLocalChannel()
+        {
+            return false;
+        }
+
+
+        @Override
+        public void enableEncryption( SecretKey key )
+        {
+        }
+
+        @Override
+        public boolean isChannelOpen()
+        {
+            return false;
+        }
+
+        @Nonnull
+        @Override
+        public INetHandler getNetHandler()
+        {
+            return handler;
+        }
+
+        @Nonnull
+        @Override
+        public ITextComponent getExitMessage()
+        {
+            return null;
+        }
+
+        @Override
+        public void disableAutoRead()
+        {
+        }
+
+        @Nonnull
+        @Override
+        public Channel channel()
+        {
+            return null;
+        }
+    }
+
+
+    public FakeNetHandler( FakePlayer player )
+    {
+        this( player.server, player );
+    }
+
+    public FakeNetHandler( MinecraftServer server, FakePlayer player )
+    {
+        super( server, new FakeNetworkManager(), player );
+    }
+
+    @Override
+    public void processInput( CPacketInput packet )
+    {
+    }
+
+    @Override
+    public void processPlayer( CPacketPlayer packet )
+    {
+    }
+
+    @Override
+    public void setPlayerLocation( double x, double y, double z, float yaw, float pitch )
+    {
+    }
+
+    @Override
+    public void processPlayerDigging( CPacketPlayerDigging packet )
+    {
+    }
+
+    @Override
+    public void onDisconnect( @Nonnull ITextComponent chat )
+    {
+    }
+
+    @Override
+    @SuppressWarnings( "rawtypes" )
+    public void sendPacket( @Nonnull final Packet packet )
+    {
+
+    }
+
+    @Override
+    public void processHeldItemChange( CPacketHeldItemChange packet )
+    {
+    }
+
+    @Override
+    public void processChatMessage( @Nonnull CPacketChatMessage packet )
+    {
+    }
+
+    @Override
+    public void processEntityAction( CPacketEntityAction packet )
+    {
+    }
+
+    @Override
+    public void processUseEntity( CPacketUseEntity packet )
+    {
+    }
+
+    @Override
+    public void processClientStatus( CPacketClientStatus packet )
+    {
+    }
+
+    @Override
+    public void processCloseWindow( @Nonnull CPacketCloseWindow packet )
+    {
+    }
+
+    @Override
+    public void processClickWindow( CPacketClickWindow packet )
+    {
+    }
+
+    @Override
+    public void processEnchantItem( CPacketEnchantItem packet )
+    {
+    }
+
+    @Override
+    public void processCreativeInventoryAction( @Nonnull CPacketCreativeInventoryAction packet )
+    {
+    }
+
+    @Override
+    public void processConfirmTransaction( @Nonnull CPacketConfirmTransaction packet )
+    {
+    }
+
+    @Override
+    public void processUpdateSign( CPacketUpdateSign packet )
+    {
+    }
+
+    @Override
+    public void processKeepAlive( @Nonnull CPacketKeepAlive packet )
+    {
+    }
+
+    @Override
+    public void processPlayerAbilities( CPacketPlayerAbilities packet )
+    {
+    }
+
+    @Override
+    public void processTabComplete( CPacketTabComplete packet )
+    {
+    }
+
+    @Override
+    public void processClientSettings( @Nonnull CPacketClientSettings packet )
+    {
+    }
+
+    @Override
+    public void processCustomPayload( CPacketCustomPayload packetIn )
+    {
+    }
+}

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

@@ -168,8 +168,8 @@ gui.computercraft:config.execution.max_main_computer_time=Computer Servertick Ze
 gui.computercraft:config.http=HTTP
 gui.computercraft:config.http.enabled=HTTP-API aktivieren
 gui.computercraft:config.http.websocket_enabled=Websockets aktivieren
-gui.computercraft:config.http.whitelist=HTTP-Whitelist
-gui.computercraft:config.http.blacklist=HTTP-Blacklist
+gui.computercraft:config.http.allowed_domains=HTTP-Whitelist
+gui.computercraft:config.http.blocked_domains=HTTP-Blacklist
 
 gui.computercraft:config.http.timeout=Zeitüberschreitung
 gui.computercraft:config.http.max_requests=Maximale Anzahl gleichzeitiger Anfragen

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

@@ -168,8 +168,8 @@ gui.computercraft:config.execution.max_main_computer_time=Server tick computer t
 gui.computercraft:config.http=HTTP
 gui.computercraft:config.http.enabled=Enable the HTTP API
 gui.computercraft:config.http.websocket_enabled=Enable websockets
-gui.computercraft:config.http.whitelist=HTTP whitelist
-gui.computercraft:config.http.blacklist=HTTP blacklist
+gui.computercraft:config.http.allowed_domains=Allowed domains
+gui.computercraft:config.http.blocked_domains=Blocked domains
 
 gui.computercraft:config.http.timeout=Timeout
 gui.computercraft:config.http.max_requests=Maximum concurrent requests

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

@@ -57,8 +57,8 @@ gui.computercraft:config.default_computer_settings=Configuración de Ordenador p
 gui.computercraft:config.log_computer_errors=Grabar errores periféricos
 
 gui.computercraft:config.http.enabled=Habilitar API de HTTP
-gui.computercraft:config.http.whitelist=Lista blanca de HTTP
-gui.computercraft:config.http.blacklist=Lista negra de HTTP
+gui.computercraft:config.http.allowed_domains=Lista blanca de HTTP
+gui.computercraft:config.http.blocked_domains=Lista negra de HTTP
 
 gui.computercraft:config.peripheral.command_block_enabled=Habilitar bloque de comandos periférico
 gui.computercraft:config.peripheral.modem_range=Rango del módem (Por defecto)

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

@@ -57,8 +57,8 @@ gui.computercraft:config.default_computer_settings=Configuration d'Ordinateur pa
 gui.computercraft:config.log_computer_errors=Journal d'erreur périphériques
 
 gui.computercraft:config.http.enabled=Permettre l'API HTTP
-gui.computercraft:config.http.whitelist=HTTP liste blanche
-gui.computercraft:config.http.blacklist=HTTP liste noire
+gui.computercraft:config.http.allowed_domains=HTTP liste blanche
+gui.computercraft:config.http.blocked_domains=HTTP liste noire
 
 gui.computercraft:config.peripheral.command_block_enabled=Permettre l'accès d'un Bloc de Commande par périphérique
 gui.computercraft:config.peripheral.modem_range=Portée d'un Modem (par défaut)

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

@@ -63,8 +63,8 @@ gui.computercraft:config.execution.computer_threads=Threads computer
 gui.computercraft:config.http=HTTP
 gui.computercraft:config.http.enabled=Attiva l'API HTTP
 gui.computercraft:config.http.websocket_enabled=Attiva websocket
-gui.computercraft:config.http.whitelist=Lista bianca HTTP
-gui.computercraft:config.http.blacklist=Lista nera HTTP
+gui.computercraft:config.http.allowed_domains=Lista bianca HTTP
+gui.computercraft:config.http.blocked_domains=Lista nera HTTP
 
 gui.computercraft:config.http.timeout=Tempo di scadenza
 gui.computercraft:config.http.max_requests=Richieste correnti massime

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

@@ -63,8 +63,8 @@ gui.computercraft:config.execution.computer_threads=Threads por computador
 gui.computercraft:config.http=HTTP
 gui.computercraft:config.http.enabled=Habilitar a biblioteca de HTTP
 gui.computercraft:config.http.websocket_enabled=Habilitar websockets
-gui.computercraft:config.http.whitelist=Lista de endereços autorizados
-gui.computercraft:config.http.blacklist=Lista de endereços proíbidos
+gui.computercraft:config.http.allowed_domains=Lista de endereços autorizados
+gui.computercraft:config.http.blocked_domains=Lista de endereços proíbidos
 
 gui.computercraft:config.http.timeout=Tempo limite para conexões
 gui.computercraft:config.http.max_requests=Limite de conexões paralelas

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

@@ -63,8 +63,8 @@ gui.computercraft:config.execution.computer_threads=Dator trådar
 gui.computercraft:config.http=HTTP
 gui.computercraft:config.http.enabled=Aktivera HTTP API
 gui.computercraft:config.http.websocket_enabled=Aktivera websockets
-gui.computercraft:config.http.whitelist=HTTP vitlista
-gui.computercraft:config.http.blacklist=HTTP svartlista
+gui.computercraft:config.http.allowed_domains=HTTP vitlista
+gui.computercraft:config.http.blocked_domains=HTTP svartlista
 
 gui.computercraft:config.http.timeout=Timeout
 gui.computercraft:config.http.max_requests=Maximalt antal samgående förfrågningar

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

@@ -168,8 +168,8 @@ gui.computercraft:config.execution.max_main_computer_time=服务器计算机tick
 gui.computercraft:config.http=HTTP
 gui.computercraft:config.http.enabled=启用HTTP API
 gui.computercraft:config.http.websocket_enabled=启用websockets
-gui.computercraft:config.http.whitelist=HTTP白名单
-gui.computercraft:config.http.blacklist=HTTP黑名单
+gui.computercraft:config.http.allowed_domains=HTTP白名单
+gui.computercraft:config.http.blocked_domains=HTTP黑名单
 
 gui.computercraft:config.http.timeout=Timeout
 gui.computercraft:config.http.max_requests=最大并发请求数

src/main/resources/assets/computercraft/lua/bios.lua

@@ -93,7 +93,7 @@ if _VERSION == "Lua 5.1" then
             bxor = bit32.bxor,
             brshift = bit32.arshift,
             blshift = bit32.lshift,
-            blogic_rshift = bit32.rshift
+            blogic_rshift = bit32.rshift,
         }
     end
 end
@@ -184,7 +184,7 @@ function sleep( nTime )
     expect(1, nTime, "number", "nil")
     local timer = os.startTimer( nTime or 0 )
     repeat
-        local sEvent, param = os.pullEvent( "timer" )
+        local _, param = os.pullEvent( "timer" )
     until param == timer
 end
 
@@ -207,13 +207,13 @@ function write( sText )
     end
 
     -- Print the line with proper word wrapping
-    while string.len(sText) > 0 do
+    while #sText > 0 do
         local whitespace = string.match( sText, "^[ \t]+" )
         if whitespace then
             -- Print whitespace
             term.write( whitespace )
             x, y = term.getCursorPos()
-            sText = string.sub( sText, string.len(whitespace) + 1 )
+            sText = string.sub( sText, #whitespace + 1 )
         end
 
         local newline = string.match( sText, "^\n" )
@@ -225,20 +225,20 @@ function write( sText )
 
         local text = string.match( sText, "^[^ \t\n]+" )
         if text then
-            sText = string.sub( sText, string.len(text) + 1 )
-            if string.len(text) > w then
+            sText = string.sub( sText, #text + 1 )
+            if #text > w then
                 -- Print a multiline word
-                while string.len( text ) > 0 do
+                while #text > 0 do
                     if x > w then
                         newLine()
                     end
                     term.write( text )
-                    text = string.sub( text, (w-x) + 2 )
+                    text = string.sub( text, w - x + 2 )
                     x, y = term.getCursorPos()
                 end
             else
                 -- Print a word normally
-                if x + string.len(text) - 1 > w then
+                if x + #text - 1 > w then
                     newLine()
                 end
                 term.write( text )
@@ -291,7 +291,7 @@ function read( _sReplaceChar, _tHistory, _fnComplete, _sDefault )
         sLine = ""
     end
     local nHistoryPos
-    local nPos = #sLine
+    local nPos, nScroll = #sLine, 0
     if _sReplaceChar then
         _sReplaceChar = string.sub( _sReplaceChar, 1, 1 )
     end
@@ -299,7 +299,7 @@ function read( _sReplaceChar, _tHistory, _fnComplete, _sDefault )
     local tCompletions
     local nCompletion
     local function recomplete()
-        if _fnComplete and nPos == string.len(sLine) then
+        if _fnComplete and nPos == #sLine then
             tCompletions = _fnComplete( sLine )
             if tCompletions and #tCompletions > 0 then
                 nCompletion = 1
@@ -321,16 +321,20 @@ function read( _sReplaceChar, _tHistory, _fnComplete, _sDefault )
     local sx = term.getCursorPos()
 
     local function redraw( _bClear )
-        local nScroll = 0
-        if sx + nPos >= w then
-            nScroll = (sx + nPos) - w
+        local cursor_pos = nPos - nScroll
+        if sx + cursor_pos >= w then
+            -- We've moved beyond the RHS, ensure we're on the edge.
+            nScroll = sx + nPos - w
+        elseif cursor_pos < 0 then
+            -- We've moved beyond the LHS, ensure we're on the edge.
+            nScroll = nPos
         end
 
         local _, cy = term.getCursorPos()
         term.setCursorPos( sx, cy )
-        local sReplace = (_bClear and " ") or _sReplaceChar
+        local sReplace = _bClear and " " or _sReplaceChar
         if sReplace then
-            term.write( string.rep( sReplace, math.max( string.len(sLine) - nScroll, 0 ) ) )
+            term.write( string.rep( sReplace, math.max( #sLine - nScroll, 0 ) ) )
         else
             term.write( string.sub( sLine, nScroll + 1 ) )
         end
@@ -345,7 +349,7 @@ function read( _sReplaceChar, _tHistory, _fnComplete, _sDefault )
                 term.setBackgroundColor( colors.gray )
             end
             if sReplace then
-                term.write( string.rep( sReplace, string.len( sCompletion ) ) )
+                term.write( string.rep( sReplace, #sCompletion ) )
             else
                 term.write( sCompletion )
             end
@@ -373,7 +377,7 @@ function read( _sReplaceChar, _tHistory, _fnComplete, _sDefault )
             -- Find the common prefix of all the other suggestions which start with the same letter as the current one
             local sCompletion = tCompletions[ nCompletion ]
             sLine = sLine .. sCompletion
-            nPos = string.len( sLine )
+            nPos = #sLine
 
             -- Redraw
             recomplete()
@@ -381,7 +385,7 @@ function read( _sReplaceChar, _tHistory, _fnComplete, _sDefault )
         end
     end
     while true do
-        local sEvent, param = os.pullEvent()
+        local sEvent, param, param1, param2 = os.pullEvent()
         if sEvent == "char" then
             -- Typed key
             clear()
@@ -394,7 +398,7 @@ function read( _sReplaceChar, _tHistory, _fnComplete, _sDefault )
             -- Pasted text
             clear()
             sLine = string.sub( sLine, 1, nPos ) .. param .. string.sub( sLine, nPos + 1 )
-            nPos = nPos + string.len( param )
+            nPos = nPos + #param
             recomplete()
             redraw()
 
@@ -419,7 +423,7 @@ function read( _sReplaceChar, _tHistory, _fnComplete, _sDefault )
 
             elseif param == keys.right then
                 -- Right
-                if nPos < string.len(sLine) then
+                if nPos < #sLine then
                     -- Move right
                     clear()
                     nPos = nPos + 1
@@ -470,10 +474,10 @@ function read( _sReplaceChar, _tHistory, _fnComplete, _sDefault )
                     end
                     if nHistoryPos then
                         sLine = _tHistory[nHistoryPos]
-                        nPos = string.len( sLine )
+                        nPos, nScroll = #sLine, 0
                     else
                         sLine = ""
-                        nPos = 0
+                        nPos, nScroll = 0, 0
                     end
                     uncomplete()
                     redraw()
@@ -486,6 +490,7 @@ function read( _sReplaceChar, _tHistory, _fnComplete, _sDefault )
                     clear()
                     sLine = string.sub( sLine, 1, nPos - 1 ) .. string.sub( sLine, nPos + 1 )
                     nPos = nPos - 1
+                    if nScroll > 0 then nScroll = nScroll - 1 end
                     recomplete()
                     redraw()
                 end
@@ -501,7 +506,7 @@ function read( _sReplaceChar, _tHistory, _fnComplete, _sDefault )
 
             elseif param == keys.delete then
                 -- Delete
-                if nPos < string.len(sLine) then
+                if nPos < #sLine then
                     clear()
                     sLine = string.sub( sLine, 1, nPos ) .. string.sub( sLine, nPos + 2 )
                     recomplete()
@@ -510,9 +515,9 @@ function read( _sReplaceChar, _tHistory, _fnComplete, _sDefault )
 
             elseif param == keys["end"] then
                 -- End
-                if nPos < string.len(sLine ) then
+                if nPos < #sLine then
                     clear()
-                    nPos = string.len(sLine)
+                    nPos = #sLine
                     recomplete()
                     redraw()
                 end
@@ -525,9 +530,9 @@ function read( _sReplaceChar, _tHistory, _fnComplete, _sDefault )
 
         elseif sEvent == "mouse_click" or sEvent == "mouse_drag" and param == 1 then
             local _, cy = term.getCursorPos()
-            if param2 >= sx and param2 <= w and param2 == cy then
-                -- Then ensure we don't scroll beyond the current line
-                nPos = math.min(math.max(nScroll + x - sx, 0), #sLine)
+            if param1 >= sx and param1 <= w and param2 == cy then
+                -- Ensure we don't scroll beyond the current line
+                nPos = math.min(math.max(nScroll + param1 - sx, 0), #sLine)
                 redraw()
             end
 
@@ -539,7 +544,7 @@ function read( _sReplaceChar, _tHistory, _fnComplete, _sDefault )
         end
     end
 
-    local cx, cy = term.getCursorPos()
+    local _, cy = term.getCursorPos()
     term.setCursorBlink( false )
     term.setCursorPos( w + 1, cy )
     print()
@@ -675,7 +680,8 @@ if http then
 
     local methods = {
         GET = true, POST = true, HEAD = true,
-        OPTIONS = true, PUT = true, DELETE = true
+        OPTIONS = true, PUT = true, DELETE = true,
+        PATCH = true, TRACE = true,
     }
 
     local function checkKey( options, key, ty, opt )
@@ -770,7 +776,7 @@ if http then
         if not ok then return ok, err end
 
         while true do
-            local event, url, ok, err = os.pullEvent( "http_check" )
+            local _, url, ok, err = os.pullEvent( "http_check" )
             if url == _url then return ok, err end
         end
     end
@@ -803,8 +809,8 @@ function fs.complete( sPath, sLocation, bIncludeFiles, bIncludeDirs )
     expect(3, bIncludeFiles, "boolean", "nil")
     expect(4, bIncludeDirs, "boolean", "nil")
 
-    bIncludeFiles = (bIncludeFiles ~= false)
-    bIncludeDirs = (bIncludeDirs ~= false)
+    bIncludeFiles = bIncludeFiles ~= false
+    bIncludeDirs = bIncludeDirs ~= false
     local sDir = sLocation
     local nStart = 1
     local nSlash = string.find( sPath, "[/\\]", nStart )
@@ -831,9 +837,9 @@ function fs.complete( sPath, sLocation, bIncludeFiles, bIncludeDirs )
         end
         if sDir ~= "" then
             if sPath == "" then
-                table.insert( tResults, (bIncludeDirs and "..") or "../" )
+                table.insert( tResults, bIncludeDirs and ".." or "../" )
             elseif sPath == "." then
-                table.insert( tResults, (bIncludeDirs and ".") or "./" )
+                table.insert( tResults, bIncludeDirs and "." or "./" )
             end
         end
         local tFiles = fs.list( sDir )
@@ -862,7 +868,7 @@ end
 -- Load APIs
 local bAPIError = false
 local tApis = fs.list( "rom/apis" )
-for n,sFile in ipairs( tApis ) do
+for _, sFile in ipairs( tApis ) do
     if string.sub( sFile, 1, 1 ) ~= "." then
         local sPath = fs.combine( "rom/apis", sFile )
         if not fs.isDir( sPath ) then
@@ -876,7 +882,7 @@ end
 if turtle and fs.isDir( "rom/apis/turtle" ) then
     -- Load turtle APIs
     local tApis = fs.list( "rom/apis/turtle" )
-    for n,sFile in ipairs( tApis ) do
+    for _, sFile in ipairs( tApis ) do
         if string.sub( sFile, 1, 1 ) ~= "." then
             local sPath = fs.combine( "rom/apis/turtle", sFile )
             if not fs.isDir( sPath ) then
@@ -891,7 +897,7 @@ end
 if pocket and fs.isDir( "rom/apis/pocket" ) then
     -- Load pocket APIs
     local tApis = fs.list( "rom/apis/pocket" )
-    for n,sFile in ipairs( tApis ) do
+    for _, sFile in ipairs( tApis ) do
         if string.sub( sFile, 1, 1 ) ~= "." then
             local sPath = fs.combine( "rom/apis/pocket", sFile )
             if not fs.isDir( sPath ) then
@@ -920,7 +926,7 @@ if commands and fs.isDir( "rom/apis/command" ) then
                     end
                 end
                 return nil
-            end
+            end,
         }
         setmetatable( commands, tCaseInsensitiveMetatable )
         setmetatable( commands.async, tCaseInsensitiveMetatable )
@@ -941,7 +947,7 @@ end
 
 -- Set default settings
 settings.set( "shell.allow_startup", true )
-settings.set( "shell.allow_disk_startup", (commands == nil) )
+settings.set( "shell.allow_disk_startup", commands == nil )
 settings.set( "shell.autocomplete", true )
 settings.set( "edit.autocomplete", true )
 settings.set( "edit.default_extension", "lua" )

src/main/resources/assets/computercraft/lua/rom/apis/command/commands.lua

@@ -30,12 +30,12 @@ end
 local tAsync = {}
 local tNonNBTJSONCommands = {
     [ "tellraw" ] = true,
-    [ "title" ] = true
+    [ "title" ] = true,
 }
 local tCommands = native.list()
-for n,sCommandName in ipairs(tCommands) do
+for _, sCommandName in ipairs(tCommands) do
     if env[ sCommandName ] == nil then
-        local bJSONIsNBT = (tNonNBTJSONCommands[ sCommandName ] == nil)
+        local bJSONIsNBT = tNonNBTJSONCommands[ sCommandName ] == nil
         env[ sCommandName ] = function( ... )
             local sCommand = collapseArgs( bJSONIsNBT, sCommandName, ... )
             return native.exec( sCommand )

src/main/resources/assets/computercraft/lua/rom/apis/disk.lua

@@ -62,7 +62,7 @@ end
 
 function stopAudio( name )
     if not name then
-        for n,sName in ipairs( peripheral.getNames() ) do
+        for _, sName in ipairs( peripheral.getNames() ) do
             stopAudio( sName )
         end
     else

src/main/resources/assets/computercraft/lua/rom/apis/gps.lua

@@ -13,7 +13,7 @@ local function trilaterate( A, B, C )
     local d = a2b:length()
     local ex = a2b:normalize( )
     local i = ex:dot( a2c )
-    local ey = (a2c - (ex * i)):normalize()
+    local ey = (a2c - ex * i):normalize()
     local j = ey:dot( a2c )
     local ez = ex:cross( ey )
 
@@ -24,13 +24,13 @@ local function trilaterate( A, B, C )
     local x = (r1 * r1 - r2 * r2 + d * d) / (2 * d)
     local y = (r1 * r1 - r3 * r3 - x * x + (x - i) * (x - i) + j * j) / (2 * j)
 
-    local result = A.vPosition + (ex * x) + (ey * y)
+    local result = A.vPosition + ex * x + ey * y
 
     local zSquared = r1 * r1 - x * x - y * y
     if zSquared > 0 then
         local z = math.sqrt( zSquared )
-        local result1 = result + (ez * z)
-        local result2 = result - (ez * z)
+        local result1 = result + ez * z
+        local result2 = result - ez * z
 
         local rounded1, rounded2 = result1:round( 0.01 ), result2:round( 0.01 )
         if rounded1.x ~= rounded2.x or rounded1.y ~= rounded2.y or rounded1.z ~= rounded2.z then
@@ -66,7 +66,7 @@ function locate( _nTimeout, _bDebug )
 
     -- Find a modem
     local sModemSide = nil
-    for n,sSide in ipairs( rs.getSides() ) do
+    for _, sSide in ipairs( rs.getSides() ) do
         if peripheral.getType( sSide ) == "modem" and peripheral.call( sSide, "isWireless" ) then
             sModemSide = sSide
             break

src/main/resources/assets/computercraft/lua/rom/apis/help.lua

@@ -30,14 +30,14 @@ end
 function topics()
     -- Add index
     local tItems = {
-        [ "index" ] = true
+        [ "index" ] = true,
     }
 
     -- Add topics from the path
     for sPath in string.gmatch(sPath, "[^:]+") do
         if fs.isDir( sPath ) then
             local tList = fs.list( sPath )
-            for n,sFile in pairs( tList ) do
+            for _, sFile in pairs( tList ) do
                 if string.sub( sFile, 1, 1 ) ~= "." then
                     if not fs.isDir( fs.combine( sPath, sFile ) ) then
                         if #sFile > 4 and sFile:sub(-4) == ".txt" then
@@ -52,7 +52,7 @@ function topics()
 
     -- Sort and return
     local tItemList = {}
-    for sItem, b in pairs( tItems ) do
+    for sItem in pairs( tItems ) do
         table.insert( tItemList, sItem )
     end
     table.sort( tItemList )

src/main/resources/assets/computercraft/lua/rom/apis/io.lua

@@ -129,11 +129,11 @@ handleMetatable = {
 }
 
 local defaultInput = setmetatable({
-    _handle = { readLine = _G.read }
+    _handle = { readLine = _G.read },
 }, handleMetatable)
 
 local defaultOutput = setmetatable({
-    _handle = { write = _G.write }
+    _handle = { write = _G.write },
 }, handleMetatable)
 
 local defaultError = setmetatable({
@@ -147,7 +147,7 @@ local defaultError = setmetatable({
             _G.write(...)
             if term.isColour() then term.setTextColour(oldColour) end
         end,
-    }
+    },
 }, handleMetatable)
 
 local currentInput = defaultInput

src/main/resources/assets/computercraft/lua/rom/apis/keys.lua

@@ -46,7 +46,7 @@ local tKeys = {
     nil,            "pause",        nil,             "home",           "up",         -- 196
     "pageUp",       nil,            "left",          nil,              "right",      -- 201
     nil,            "end",          "down",          "pageDown",       "insert",     -- 206
-    "delete"														-- 211
+    "delete",                                                                        -- 211
 }
 
 local keys = _ENV

src/main/resources/assets/computercraft/lua/rom/apis/paintutils.lua

@@ -147,8 +147,8 @@ function drawBox( startX, startY, endX, endY, nColour )
         drawPixelInternal( x, maxY )
     end
 
-    if (maxY - minY) >= 2 then
-        for y=(minY+1),(maxY-1) do
+    if maxY - minY >= 2 then
+        for y = minY + 1, maxY - 1 do
             drawPixelInternal( minX, y )
             drawPixelInternal( maxX, y )
         end

src/main/resources/assets/computercraft/lua/rom/apis/peripheral.lua

@@ -4,12 +4,12 @@ local native = peripheral
 
 function getNames()
     local tResults = {}
-    for n,sSide in ipairs( rs.getSides() ) do
+    for _, sSide in ipairs( rs.getSides() ) do
         if native.isPresent( sSide ) then
             table.insert( tResults, sSide )
             if native.getType( sSide ) == "modem" and not native.call( sSide, "isWireless" ) then
                 local tRemote = native.call( sSide, "getNamesRemote" )
-                for n,sName in ipairs( tRemote ) do
+                for _, sName in ipairs( tRemote ) do
                     table.insert( tResults, sName )
                 end
             end
@@ -23,7 +23,7 @@ function isPresent( _sSide )
     if native.isPresent( _sSide ) then
         return true
     end
-    for n,sSide in ipairs( rs.getSides() ) do
+    for _, sSide in ipairs( rs.getSides() ) do
         if native.getType( sSide ) == "modem" and not native.call( sSide, "isWireless" ) then
             if native.call( sSide, "isPresentRemote", _sSide )  then
                 return true
@@ -38,7 +38,7 @@ function getType( _sSide )
     if native.isPresent( _sSide ) then
         return native.getType( _sSide )
     end
-    for n,sSide in ipairs( rs.getSides() ) do
+    for _, sSide in ipairs( rs.getSides() ) do
         if native.getType( sSide ) == "modem" and not native.call( sSide, "isWireless" ) then
             if native.call( sSide, "isPresentRemote", _sSide )  then
                 return native.call( sSide, "getTypeRemote", _sSide )
@@ -53,7 +53,7 @@ function getMethods( _sSide )
     if native.isPresent( _sSide ) then
         return native.getMethods( _sSide )
     end
-    for n,sSide in ipairs( rs.getSides() ) do
+    for _, sSide in ipairs( rs.getSides() ) do
         if native.getType( sSide ) == "modem" and not native.call( sSide, "isWireless" ) then
             if native.call( sSide, "isPresentRemote", _sSide )  then
                 return native.call( sSide, "getMethodsRemote", _sSide )
@@ -69,7 +69,7 @@ function call( _sSide, _sMethod, ... )
     if native.isPresent( _sSide ) then
         return native.call( _sSide, _sMethod, ... )
     end
-    for n,sSide in ipairs( rs.getSides() ) do
+    for _, sSide in ipairs( rs.getSides() ) do
         if native.getType( sSide ) == "modem" and not native.call( sSide, "isWireless" ) then
             if native.call( sSide, "isPresentRemote", _sSide )  then
                 return native.call( sSide, "callRemote", _sSide, _sMethod, ... )
@@ -84,7 +84,7 @@ function wrap( _sSide )
     if peripheral.isPresent( _sSide ) then
         local tMethods = peripheral.getMethods( _sSide )
         local tResult = {}
-        for n,sMethod in ipairs( tMethods ) do
+        for _, sMethod in ipairs( tMethods ) do
             tResult[sMethod] = function( ... )
                 return peripheral.call( _sSide, sMethod, ... )
             end
@@ -98,7 +98,7 @@ function find( sType, fnFilter )
     expect(1, sType, "string")
     expect(2, fnFilter, "function", "nil")
     local tResults = {}
-    for n,sName in ipairs( peripheral.getNames() ) do
+    for _, sName in ipairs( peripheral.getNames() ) do
         if peripheral.getType( sName ) == sType then
             local wrapped = peripheral.wrap( sName )
             if fnFilter == nil or fnFilter( sName, wrapped ) then

src/main/resources/assets/computercraft/lua/rom/apis/rednet.lua

@@ -27,7 +27,7 @@ function close( sModem )
         peripheral.call( sModem, "close", CHANNEL_BROADCAST )
     else
         -- Close all modems
-        for n,sModem in ipairs( peripheral.getNames() ) do
+        for _, sModem in ipairs( peripheral.getNames() ) do
             if isOpen( sModem ) then
                 close( sModem )
             end
@@ -44,7 +44,7 @@ function isOpen( sModem )
         end
     else
         -- Check if any modem is open
-        for n,sModem in ipairs( peripheral.getNames() ) do
+        for _, sModem in ipairs( peripheral.getNames() ) do
             if isOpen( sModem ) then
                 return true
             end
@@ -79,10 +79,10 @@ function send( nRecipient, message, sProtocol )
         sent = true
     else
         -- Send on all open modems, to the target and to repeaters
-        for n,sModem in ipairs( peripheral.getNames() ) do
+        for _, sModem in ipairs( peripheral.getNames() ) do
             if isOpen( sModem ) then
-                peripheral.call( sModem, "transmit", nRecipient, nReplyChannel, tMessage );
-                peripheral.call( sModem, "transmit", CHANNEL_REPEAT, nReplyChannel, tMessage );
+                peripheral.call( sModem, "transmit", nRecipient, nReplyChannel, tMessage )
+                peripheral.call( sModem, "transmit", CHANNEL_REPEAT, nReplyChannel, tMessage )
                 sent = true
             end
         end

src/main/resources/assets/computercraft/lua/rom/apis/settings.lua

@@ -47,7 +47,7 @@ end
 
 function getNames()
     local result = {}
-    for k,v in pairs( tSettings ) do
+    for k in pairs( tSettings ) do
         result[ #result + 1 ] = k
     end
     table.sort(result)

src/main/resources/assets/computercraft/lua/rom/apis/term.lua

@@ -1,6 +1,6 @@
 local expect = dofile("rom/modules/main/cc/expect.lua").expect
 
-local native = (term.native and term.native()) or term
+local native = term.native and term.native() or term
 local redirectTarget = native
 
 local function wrap( _sFunction )

src/main/resources/assets/computercraft/lua/rom/apis/textutils.lua

@@ -10,13 +10,13 @@ function slowWrite( sText, nRate )
 
     sText = tostring( sText )
     local x, y = term.getCursorPos()
-    local len = string.len( sText )
+    local len = #sText
 
     for n = 1, len do
         term.setCursorPos( x, y )
         sleep( nSleep )
         local nLines = write( string.sub( sText, 1, n ) )
-        local newX, newY = term.getCursorPos()
+        local _, newY = term.getCursorPos()
         y = newY - nLines
     end
 end
@@ -54,11 +54,11 @@ local function makePagedScroll( _term, _nFreeLines )
     local nativeScroll = _term.scroll
     local nFreeLines = _nFreeLines or 0
     return function( _n )
-        for n=1,_n do
+        for _ = 1, _n do
             nativeScroll( 1 )
 
             if nFreeLines <= 0 then
-                local w,h = _term.getSize()
+                local _, h = _term.getSize()
                 _term.setCursorPos( 1, h )
                 _term.write( "Press any key to continue" )
                 os.pullEvent( "key" )
@@ -116,14 +116,14 @@ local function tabulateCommon( bPaged, ... )
                 if type( sItem ) ~= "string" then
                     error( "bad argument #" .. n .. "." .. nu .. " (expected string, got " .. type( sItem ) .. ")", 3 )
                 end
-                nMaxLen = math.max( string.len( sItem ) + 1, nMaxLen )
+                nMaxLen = math.max( #sItem + 1, nMaxLen )
             end
         end
     end
     local nCols = math.floor( w / nMaxLen )
     local nLines = 0
     local function newLine()
-        if bPaged and nLines >= (h-3) then
+        if bPaged and nLines >= h - 3 then
             pagedPrint()
         else
             print()
@@ -133,14 +133,14 @@ local function tabulateCommon( bPaged, ... )
 
     local function drawCols( _t )
         local nCol = 1
-        for n, s in ipairs( _t ) do
+        for _, s in ipairs( _t ) do
             if nCol > nCols then
                 nCol = 1
                 newLine()
             end
 
             local cx, cy = term.getCursorPos()
-            cx = 1 + ((nCol - 1) * nMaxLen)
+            cx = 1 + (nCol - 1) * nMaxLen
             term.setCursorPos( cx, cy )
             term.write( s )
 
@@ -148,7 +148,7 @@ local function tabulateCommon( bPaged, ... )
         end
         print()
     end
-    for n, t in ipairs( tAll ) do
+    for _, t in ipairs( tAll ) do
         if type(t) == "table" then
             if #t > 0 then
                 drawCols( t )
@@ -241,7 +241,7 @@ end
 empty_json_array = setmetatable({}, {
     __newindex = function()
         error("attempt to mutate textutils.empty_json_array", 2)
-    end
+    end,
 })
 
 local function serializeJSONImpl( t, tTracking, bNBTStyle )
@@ -280,7 +280,7 @@ local function serializeJSONImpl( t, tTracking, bNBTStyle )
                     nObjectSize = nObjectSize + 1
                 end
             end
-            for n,v in ipairs(t) do
+            for _, v in ipairs(t) do
                 local sEntry = serializeJSONImpl( v, tTracking, bNBTStyle )
                 if nArraySize == 0 then
                     sArrayResult = sArrayResult .. sEntry
@@ -388,7 +388,7 @@ function complete( sSearchText, tSearchTable )
     end
 
     local sPart = string.sub( sSearchText, nStart )
-    local nPartLength = string.len( sPart )
+    local nPartLength = #sPart
 
     local tResults = {}
     local tSeen = {}

src/main/resources/assets/computercraft/lua/rom/apis/vector.lua

@@ -54,9 +54,9 @@ local vector = {
 	round = function( self, nTolerance )
 	    nTolerance = nTolerance or 1.0
 		return vector.new(
-			math.floor( (self.x + (nTolerance * 0.5)) / nTolerance ) * nTolerance,
-			math.floor( (self.y + (nTolerance * 0.5)) / nTolerance ) * nTolerance,
-			math.floor( (self.z + (nTolerance * 0.5)) / nTolerance ) * nTolerance
+			math.floor( (self.x + nTolerance * 0.5) / nTolerance ) * nTolerance,
+			math.floor( (self.y + nTolerance * 0.5) / nTolerance ) * nTolerance,
+			math.floor( (self.z + nTolerance * 0.5) / nTolerance ) * nTolerance
 		)
 	end,
 	tostring = function( self )
@@ -78,7 +78,7 @@ function new( x, y, z )
 	local v = {
 		x = tonumber(x) or 0,
 		y = tonumber(y) or 0,
-		z = tonumber(z) or 0
+		z = tonumber(z) or 0,
 	}
 	setmetatable( v, vmetatable )
 	return v

src/main/resources/assets/computercraft/lua/rom/apis/window.lua

@@ -49,7 +49,7 @@ function create( parent, nX, nY, nWidth, nHeight, bStartVisible )
     createEmptyLines( nWidth )
 
     -- Setup
-    local bVisible = (bStartVisible ~= false)
+    local bVisible = bStartVisible ~= false
     local nCursorX = 1
     local nCursorY = 1
     local bCursorBlink = false
@@ -456,7 +456,7 @@ function create( parent, nX, nY, nWidth, nHeight, bStartVisible )
                     tNewLines[y] = {
                         text = sEmptyText,
                         textColor = sEmptyTextColor,
-                        backgroundColor = sEmptyBackgroundColor
+                        backgroundColor = sEmptyBackgroundColor,
                     }
                 else
                     local tOldLine = tLines[y]

src/main/resources/assets/computercraft/lua/rom/help/changelog.txt

@@ -1,3 +1,23 @@
+# New features in CC: Tweaked 1.86.0
+
+* Add PATCH and TRACE HTTP methods. (jaredallard)
+* Add more MOTD messages. (JakobDev)
+* Allow removing and adding turtle upgrades via CraftTweaker.
+
+And several bug fixes:
+* Fix crash when interacting with Wearable Backpacks.
+
+# New features in CC: Tweaked 1.85.2
+
+* Fix crashes when using the mouse with advanced computers.
+
+# New features in CC: Tweaked 1.85.1
+
+* Add basic mouse support to `read`
+
+And several bug fixes:
+* Fix turtles not having breaking particles.
+
 # New features in CC: Tweaked 1.85.0
 
 * Window.reposition now allows changing the redirect buffer

src/main/resources/assets/computercraft/lua/rom/help/whatsnew.txt

@@ -1,11 +1,10 @@
-New features in CC: Tweaked 1.85.0
+New features in CC: Tweaked 1.86.0
 
-* Window.reposition now allows changing the redirect buffer
-* Add cc.completion and cc.shell.completion modules
-* command.exec also returns the number of affected objects, when exposed by the game.
+* Add PATCH and TRACE HTTP methods. (jaredallard)
+* Add more MOTD messages. (JakobDev)
+* Allow removing and adding turtle upgrades via CraftTweaker.
 
 And several bug fixes:
-* Change how turtle mining drops are handled, improving compatibility with some mods.
-* Fix several GUI desyncs after a turtle moves.
+* Fix crash when interacting with Wearable Backpacks.
 
 Type "help changelog" to see the full version history.

src/main/resources/assets/computercraft/lua/rom/motd.txt

@@ -1,7 +1,7 @@
 View the source code at https://github.com/SquidDev-CC/CC-Tweaked
 View the documentation at https://wiki.computercraft.cc
 Visit the forum at https://forums.computercraft.cc
-You can disable these messages by running "set motd.enable false"
+You can disable these messages by running "set motd.enable false".
 You can create directories with "mkdir".
 Want to see hidden files? Run "set list.show_hidden true".
 Run "list" or "ls" to see all files in a directory.
@@ -13,3 +13,22 @@ Use the "edit" program to create and edit your programs.
 You can copy files with "copy" or "cp".
 You can use "wget run <url>" to run a program from the internet.
 You can use "wget" to download a file from the internet.
+On an advanced computer you can use "fg" or "bg" to run multiple programs at the same time.
+Use "type" to see if a path is a file or a directory.
+Get a list of all programs with "programs".
+Use an advanced computer to use colours and the mouse.
+With a speaker you can play sounds.
+Use "motd" to print the Message of the Day.
+You can disable the startup from a computer with "set shell.allow_startup false".
+You can disable the startup from a disk with "set shell.allow_disk_startup false".
+Programs that are placed in the "startup" folder in the root of a computer are started on boot.
+Use a modem to connect with other computers.
+With the "gps" program you can get the position of a computer.
+Use "monitor" to run a program on a attached monitor.
+View all attached peripherals with "peripherals".
+Use "time" to see the in-game time.
+You can set the label of a computer with "label set".
+A computer needs a label to keep its files if it got destroyed.
+You can disable auto completion in the shell with "set shell.autocomplete false".
+You can disable auto completion in edit with "set edit.autocomplete false".
+Feeling creative? Use a printer to print a book!

src/main/resources/assets/computercraft/lua/rom/programs/advanced/multishell.lua

@@ -172,7 +172,6 @@ local function resizeWindows()
     end
     for n = 1, #tProcesses do
         local tProcess = tProcesses[n]
-        local window = tProcess.window
         local x, y = tProcess.window.getCursorPos()
         if y > windowHeight then
             tProcess.window.scroll( y - windowHeight )
@@ -232,7 +231,7 @@ function multishell.launch( tProgramEnv, sProgramPath, ... )
     expect(1, tProgramEnv, "table")
     expect(2, sProgramPath, "string")
     local previousTerm = term.current()
-    setMenuVisible( (#tProcesses + 1) >= 2 )
+    setMenuVisible( #tProcesses + 1 >= 2 )
     local nResult = launchProcess( false, tProgramEnv, sProgramPath, ... )
     redrawMenu()
     term.redirect( previousTerm )
@@ -288,7 +287,7 @@ while #tProcesses > 0 do
                     tabStart = 2
                 end
                 for n = nScrollPos, #tProcesses do
-                    local tabEnd = tabStart + string.len( tProcesses[n].sTitle ) + 1
+                    local tabEnd = tabStart + #tProcesses[n].sTitle + 1
                     if x >= tabStart and x <= tabEnd then
                         selectProcess( n )
                         redrawMenu()
@@ -299,7 +298,7 @@ while #tProcesses > 0 do
             end
         else
             -- Passthrough to current process
-            resumeProcess( nCurrentProcess, sEvent, button, x, (bShowMenu and y-1) or y )
+            resumeProcess( nCurrentProcess, sEvent, button, x, bShowMenu and y - 1 or y )
             if cullProcess( nCurrentProcess ) then
                 setMenuVisible( #tProcesses >= 2 )
                 redrawMenu()
@@ -319,7 +318,7 @@ while #tProcesses > 0 do
             end
         elseif not (bShowMenu and y == 1) then
             -- Passthrough to current process
-            resumeProcess( nCurrentProcess, sEvent, p1, x, (bShowMenu and y-1) or y )
+            resumeProcess( nCurrentProcess, sEvent, p1, x, bShowMenu and y - 1 or y )
             if cullProcess( nCurrentProcess ) then
                 setMenuVisible( #tProcesses >= 2 )
                 redrawMenu()

src/main/resources/assets/computercraft/lua/rom/programs/copy.lua

@@ -9,7 +9,7 @@ local sSource = shell.resolve( tArgs[1] )
 local sDest = shell.resolve( tArgs[2] )
 local tFiles = fs.find( sSource )
 if #tFiles > 0 then
-    for n,sFile in ipairs( tFiles ) do
+    for _, sFile in ipairs( tFiles ) do
         if fs.isDir( sDest ) then
             fs.copy( sFile, fs.combine( sDest, fs.getName(sFile) ) )
         elseif #tFiles == 1 then

src/main/resources/assets/computercraft/lua/rom/programs/delete.lua

@@ -8,7 +8,7 @@ end
 for i = 1, args.n do
     local files = fs.find(shell.resolve(args[i]))
     if #files > 0 then
-        for n, file in ipairs(files) do
+        for _, file in ipairs(files) do
             local ok, err = pcall(fs.delete, file)
             if not ok then
                 printError((err:gsub("^pcall: ", "")))

src/main/resources/assets/computercraft/lua/rom/programs/drive.lua

@@ -10,9 +10,9 @@ if fs.exists( sPath ) then
     write( fs.getDrive( sPath ) .. " (" )
     local nSpace = fs.getFreeSpace( sPath )
     if nSpace >= 1000 * 1000 then
-        print( (math.floor( nSpace / (100 * 1000) ) / 10) .. "MB remaining)" )
+        print( math.floor( nSpace / (100 * 1000) ) / 10 .. "MB remaining)" )
     elseif nSpace >= 1000 then
-        print( (math.floor( nSpace / 100 ) / 10) .. "KB remaining)" )
+        print( math.floor( nSpace / 100 ) / 10 .. "KB remaining)" )
     else
         print( nSpace .. "B remaining)" )
     end

src/main/resources/assets/computercraft/lua/rom/programs/edit.lua

@@ -62,7 +62,7 @@ end
 table.insert( tMenuItems, "Exit" )
 
 local sStatus = "Press Ctrl to access menu"
-if string.len( sStatus ) > w - 5 then
+if #sStatus > w - 5 then
     sStatus = "Press Ctrl for menu"
 end
 
@@ -95,7 +95,7 @@ local function save( _sPath )
     local function innerSave()
         file, fileerr = fs.open( _sPath, "w" )
         if file then
-            for n, sLine in ipairs( tLines ) do
+            for _, sLine in ipairs( tLines ) do
                 file.write( sLine .. "\n" )
             end
         else
@@ -144,13 +144,13 @@ local function tryWrite( sLine, regex, colour )
         end
         term.write( match )
         term.setTextColour( textColour )
-        return string.sub( sLine, string.len(match) + 1 )
+        return string.sub( sLine, #match + 1 )
     end
     return nil
 end
 
 local function writeHighlighted( sLine )
-    while string.len(sLine) > 0 do
+    while #sLine > 0 do
         sLine =
             tryWrite( sLine, "^%-%-%[%[.-%]%]", commentColour ) or
             tryWrite( sLine, "^%-%-.*", commentColour ) or
@@ -188,7 +188,7 @@ end
 
 local function recomplete()
     local sLine = tLines[y]
-    if not bMenu and not bReadOnly and x == string.len(sLine) + 1 then
+    if not bMenu and not bReadOnly and x == #sLine + 1 then
         tCompletions = complete( sLine )
         if tCompletions and #tCompletions > 0 then
             nCompletion = 1
@@ -248,7 +248,7 @@ local function redrawMenu()
     term.clearLine()
 
     -- Draw line numbers
-    term.setCursorPos( w - string.len( "Ln "..y ) + 1, h )
+    term.setCursorPos( w - #( "Ln " .. y ) + 1, h )
     term.setTextColour( highlightColour )
     term.write( "Ln " )
     term.setTextColour( textColour )
@@ -287,7 +287,7 @@ local tMenuFuncs = {
         if bReadOnly then
             sStatus = "Access denied"
         else
-            local ok, err, fileerr  = save( sPath )
+            local ok, _, fileerr  = save( sPath )
             if ok then
                 sStatus = "Saved to " .. sPath
             else
@@ -357,7 +357,7 @@ local tMenuFuncs = {
         term.redirect( printerTerminal )
         local ok, error = pcall( function()
             term.scroll()
-            for n, sLine in ipairs( tLines ) do
+            for _, sLine in ipairs( tLines ) do
                 print( sLine )
             end
         end )
@@ -385,7 +385,7 @@ local tMenuFuncs = {
     end,
     Run = function()
         local sTempPath = "/.temp"
-        local ok, err = save( sTempPath )
+        local ok = save( sTempPath )
         if ok then
             local nTask = shell.openTab( sTempPath )
             if nTask then
@@ -398,7 +398,7 @@ local tMenuFuncs = {
             sStatus = "Error saving to " .. sTempPath
         end
         redrawMenu()
-    end
+    end,
 }
 
 local function doMenuItem( _n )
@@ -411,7 +411,7 @@ local function doMenuItem( _n )
 end
 
 local function setCursor( newX, newY )
-    local oldX, oldY = x, y
+    local _, oldY = x, y
     x, y = newX, newY
     local screenX = x - scrollX
     local screenY = y - scrollY
@@ -468,7 +468,7 @@ local function acceptCompletion()
         -- Append the completion
         local sCompletion = tCompletions[ nCompletion ]
         tLines[y] = tLines[y] .. sCompletion
-        setCursor( x + string.len( sCompletion ), y )
+        setCursor( x + #sCompletion , y )
     end
 end
 
@@ -476,7 +476,6 @@ end
 while bRunning do
     local sEvent, param, param2, param3 = os.pullEvent()
     if sEvent == "key" then
-        local oldX, oldY = x, y
         if param == keys.up then
             -- Up
             if not bMenu then
@@ -491,7 +490,7 @@ while bRunning do
                 elseif y > 1 then
                     -- Move cursor up
                     setCursor(
-                        math.min( x, string.len( tLines[y - 1] ) + 1 ),
+                        math.min( x, #tLines[y - 1] + 1 ),
                         y - 1
                     )
                 end
@@ -512,7 +511,7 @@ while bRunning do
                 elseif y < #tLines then
                     -- Move cursor down
                     setCursor(
-                        math.min( x, string.len( tLines[y + 1] ) + 1 ),
+                        math.min( x, #tLines[y + 1] + 1 ),
                         y + 1
                     )
                 end
@@ -521,7 +520,7 @@ while bRunning do
         elseif param == keys.tab then
             -- Tab
             if not bMenu and not bReadOnly then
-                if nCompletion and x == string.len(tLines[y]) + 1 then
+                if nCompletion and x == #tLines[y] + 1 then
                     -- Accept autocomplete
                     acceptCompletion()
                 else
@@ -543,7 +542,7 @@ while bRunning do
                     newY = 1
                 end
                 setCursor(
-                    math.min( x, string.len( tLines[newY] ) + 1 ),
+                    math.min( x, #tLines[newY] + 1 ),
                     newY
                 )
             end
@@ -558,7 +557,7 @@ while bRunning do
                 else
                     newY = #tLines
                 end
-                local newX = math.min( x, string.len( tLines[newY] ) + 1 )
+                local newX = math.min( x, #tLines[newY] + 1 )
                 setCursor( newX, newY )
             end
 
@@ -575,7 +574,7 @@ while bRunning do
             -- End
             if not bMenu then
                 -- Move cursor to the end
-                local nLimit = string.len( tLines[y] ) + 1
+                local nLimit = #tLines[y] + 1
                 if x < nLimit then
                     setCursor( nLimit, y )
                 end
@@ -588,7 +587,7 @@ while bRunning do
                     -- Move cursor left
                     setCursor( x - 1, y )
                 elseif x == 1 and y > 1 then
-                    setCursor( string.len( tLines[y-1] ) + 1, y - 1 )
+                    setCursor( #tLines[y - 1] + 1, y - 1 )
                 end
             else
                 -- Move menu left
@@ -602,11 +601,11 @@ while bRunning do
         elseif param == keys.right then
             -- Right
             if not bMenu then
-                local nLimit = string.len( tLines[y] ) + 1
+                local nLimit = #tLines[y] + 1
                 if x < nLimit then
                     -- Move cursor right
                     setCursor( x + 1, y )
-                elseif nCompletion and x == string.len(tLines[y]) + 1 then
+                elseif nCompletion and x == #tLines[y] + 1 then
                     -- Accept autocomplete
                     acceptCompletion()
                 elseif x == nLimit and y < #tLines then
@@ -625,7 +624,7 @@ while bRunning do
         elseif param == keys.delete then
             -- Delete
             if not bMenu and not bReadOnly then
-                local nLimit = string.len( tLines[y] ) + 1
+                local nLimit = #tLines[y] + 1
                 if x < nLimit then
                     local sLine = tLines[y]
                     tLines[y] = string.sub(sLine, 1, x - 1) .. string.sub(sLine, x + 1)
@@ -654,7 +653,7 @@ while bRunning do
                     end
                 elseif y > 1 then
                     -- Remove newline
-                    local sPrevLen = string.len( tLines[y-1] )
+                    local sPrevLen = #tLines[y - 1]
                     tLines[y - 1] = tLines[y - 1] .. tLines[y]
                     table.remove( tLines, y )
                     setCursor( sPrevLen + 1, y - 1 )
@@ -722,7 +721,7 @@ while bRunning do
             -- Input text
             local sLine = tLines[y]
             tLines[y] = string.sub(sLine, 1, x - 1) .. param .. string.sub(sLine, x)
-            setCursor( x + string.len( param ), y )
+            setCursor( x + #param , y )
         end
 
     elseif sEvent == "mouse_click" then
@@ -732,7 +731,7 @@ while bRunning do
                 local cx, cy = param2, param3
                 if cy < h then
                     local newY = math.min( math.max( scrollY + cy, 1 ), #tLines )
-                    local newX = math.min( math.max( scrollX + cx, 1 ), string.len( tLines[newY] ) + 1 )
+                    local newX = math.min( math.max( scrollX + cx, 1 ), #tLines[newY] + 1 )
                     setCursor( newX, newY )
                 end
             end

src/main/resources/assets/computercraft/lua/rom/programs/fun/advanced/paint.lua

@@ -148,7 +148,7 @@ local function save(path)
         end
         sLine = string.sub( sLine, 1, nLastChar )
         tLines[y] = sLine
-        if string.len( sLine ) > 0 then
+        if #sLine > 0 then
             nLastLine = y
         end
     end
@@ -186,8 +186,8 @@ local function drawInterface()
     term.write("\127\127")
 
     -- Left and Right Selected Colours
-    for i=18,18 do
-        term.setCursorPos(w-1, i)
+    do
+        term.setCursorPos(w - 1, 18)
         if leftColour ~= nil then
             term.setBackgroundColour( leftColour )
             term.write(" ")
@@ -269,7 +269,7 @@ local function accessMenu()
         for k, v in pairs(mChoices) do
             if selection == k then
                 term.setTextColour(colours.yellow)
-                local ox,_ = term.getCursorPos()
+                local ox = term.getCursorPos()
                 term.write("[" .. string.rep(" ", #v) .. "]")
                 term.setCursorPos(ox + 1, h)
                 term.setTextColour(colours.white)

src/main/resources/assets/computercraft/lua/rom/programs/fun/advanced/redirection.lua

@@ -60,14 +60,14 @@ local tArgs = { ... }
 
 --Functions--
 local function printCentred( yc, stg )
-    local xc = math.floor((TermW - string.len(stg)) / 2) + 1
+    local xc = math.floor((TermW - #stg) / 2) + 1
     term.setCursorPos(xc, yc)
     term.write( stg )
 end
 
 local function centerOrgin()
-    XOrgin = math.floor((TermW/2)-(SizeW/2))
-    YOrgin = math.floor((TermH/2)-(SizeH/2))
+    XOrgin = math.floor(TermW / 2 - SizeW / 2)
+    YOrgin = math.floor(TermH / 2 - SizeH / 2)
 end
 
 local function reMap()
@@ -177,10 +177,9 @@ local function loadLevel(nNum)
     local sLevelD = sDir .. "/levels/" .. tostring(nNum) .. ".dat"
     if not ( fs.exists(sLevelD) or fs.isDir(sLevelD) ) then return error("Level Not Exists : " .. sLevelD) end
     fLevel = fs.open(sLevelD, "r")
-    local Line = 0
     local wl = true
     Blocks = tonumber(string.sub(fLevel.readLine(), 1, 1))
-    local xSize = string.len(fLevel.readLine())+2
+    local xSize = #fLevel.readLine() + 2
     local Lines = 3
     while wl do
         local wLine = fLevel.readLine()
@@ -188,7 +187,7 @@ local function loadLevel(nNum)
             fLevel.close()
             wl = false
         else
-            xSize = math.max(string.len(wLine)+2,xSize)
+            xSize = math.max(#wLine + 2, xSize)
             Lines = Lines + 1
         end
     end
@@ -198,7 +197,7 @@ local function loadLevel(nNum)
     fLevel.readLine()
     for Line = 2, Lines - 1 do
         local sLine = fLevel.readLine()
-        local chars = string.len(sLine)
+        local chars = #sLine
         for char = 1, chars do
             local el = string.sub(sLine, char, char)
             if el == "8" then
@@ -557,7 +556,7 @@ function InterFace.render()
         elseif p3 == TermH and p2 >= TermW - 4 and p2 <= TermW - 3 then
             bPaused = not bPaused
             fSpeedS = false
-            Speed = (bPaused and 0) or nSpeed
+            Speed = bPaused and 0 or nSpeed
             if Speed > 0 then
                 Tick = os.startTimer(Speed)
             else
@@ -567,7 +566,7 @@ function InterFace.render()
         elseif p3 == TermH and p2 >= TermW - 1 then
             bPaused = false
             fSpeedS = not fSpeedS
-            Speed = (fSpeedS and fSpeed) or nSpeed
+            Speed = fSpeedS and fSpeed or nSpeed
             Tick = os.startTimer(Speed)
             InterFace.drawBar()
         elseif p3 - 1 < YOrgin + SizeH + 1 and p3 - 1 > YOrgin and
@@ -596,7 +595,6 @@ local function startG(LevelN)
     drawStars()
     loadLevel(LevelN)
     centerOrgin()
-    local create = true
     drawMap()
     InterFace.drawBar()
     gRender("start")

src/main/resources/assets/computercraft/lua/rom/programs/fun/adventure.lua

@@ -112,7 +112,7 @@ local items = {
         desc = "A perfect handle for torches or a pickaxe.",
     },
     ["a crafting table"] = {
-        aliases = { "crafting table", "craft table", "work bench", "workbench", "crafting bench", "table", },
+        aliases = { "crafting table", "craft table", "work bench", "workbench", "crafting bench", "table" },
         desc = "It's a crafting table. I shouldn't tell you this, but these don't actually do anything in this game, you can craft tools whenever you like.",
     },
     ["a furnace"] = {
@@ -270,7 +270,7 @@ local tAnimals = {
 }
 
 local tMonsters = {
-    "a creeper", "a skeleton", "a zombie", "a spider"
+    "a creeper", "a skeleton", "a zombie", "a spider",
 }
 
 local tRecipes = {
@@ -309,7 +309,7 @@ local tGoWest = {
 local nGoWest = 0
 
 local bRunning = true
-local tMap = { { {}, }, }
+local tMap = { { {} } }
 local x, y, z = 0, 0, 0
 local inventory = {
     ["no tea"] = items["no tea"],
@@ -342,7 +342,7 @@ local function getTimeOfDay()
 end
 
 local function isSunny()
-    return (getTimeOfDay() < 10)
+    return getTimeOfDay() < 10
 end
 
 local function getRoom( x, y, z, dontCreate )
@@ -365,7 +365,7 @@ local function getRoom( x, y, z, dontCreate )
 
             -- Add animals
             if math.random(1, 3) == 1 then
-                for n = 1,math.random(1,2) do
+                for _ = 1, math.random(1, 2) do
                     local sAnimal = tAnimals[ math.random( 1, #tAnimals ) ]
                     room.items[ sAnimal ] = items[ sAnimal ]
                 end
@@ -478,7 +478,7 @@ local function findItem( _tList, _sQuery )
             return sItem
         end
         if tItem.aliases ~= nil then
-            for n, sAlias in pairs( tItem.aliases ) do
+            for _, sAlias in pairs( tItem.aliases ) do
                 if sAlias == _sQuery then
                     return sItem
                 end
@@ -613,7 +613,7 @@ local function doCommand( text )
     end
 
     for sCommand, t in pairs( tMatches ) do
-        for n, sMatch in pairs( t ) do
+        for _, sMatch in pairs( t ) do
             local tCaptures = { string.match( text, "^" .. sMatch .. "$" ) }
             if #tCaptures ~= 0 then
                 local fnCommand = commands[ sCommand ]
@@ -679,7 +679,7 @@ function commands.look( _sTarget )
             end
 
             if tItem then
-                print( tItem.desc or ("You see nothing special about "..sItem..".") )
+                print( tItem.desc or "You see nothing special about " .. sItem .. "." )
             else
                 print( "You don't see any " .. _sTarget .. " here." )
             end
@@ -752,7 +752,7 @@ function commands.dig( _sDir, _sTool )
         tTool = inventory[ sTool ]
     end
 
-    local bActuallyDigging = (room.exits[ _sDir ] ~= true)
+    local bActuallyDigging = room.exits[ _sDir ] ~= true
     if bActuallyDigging then
         if sTool == nil or tTool.toolType ~= "pick" then
             print( "You need to use a pickaxe to dig through stone." )
@@ -1021,7 +1021,7 @@ function commands.cbreak( _sItem, _sTool )
                 print( "The " .. tItem.aliases[1] .. " dies." )
 
                 if tItem.drops then
-                    for n, sDrop in pairs( tItem.drops ) do
+                    for _, sDrop in pairs( tItem.drops ) do
                         if not room.items[sDrop] then
                             print( "The " .. tItem.aliases[1] .. " dropped " .. sDrop .. "." )
                             room.items[sDrop] = items[sDrop]
@@ -1037,7 +1037,7 @@ function commands.cbreak( _sItem, _sTool )
             end
 
             if tItem.hitDrops then
-                for n, sDrop in pairs( tItem.hitDrops ) do
+                for _, sDrop in pairs( tItem.hitDrops ) do
                     if not room.items[sDrop] then
                         print( "The " .. tItem.aliases[1] .. " dropped " .. sDrop .. "." )
                         room.items[sDrop] = items[sDrop]
@@ -1071,18 +1071,17 @@ function commands.craft( _sItem )
         return
     end
 
-    local room = getRoom( x,y,z )
     local sItem = findItem( items, _sItem )
-    local tRecipe = (sItem and tRecipes[ sItem ]) or nil
+    local tRecipe = sItem and tRecipes[ sItem ] or nil
     if tRecipe then
-        for n,sReq in ipairs( tRecipe ) do
+        for _, sReq in ipairs( tRecipe ) do
             if inventory[sReq] == nil then
                 print( "You don't have the items you need to craft " .. sItem .. "." )
                 return
             end
         end
 
-        for n,sReq in ipairs( tRecipe ) do
+        for _, sReq in ipairs( tRecipe ) do
             inventory[sReq] = nil
         end
         inventory[ sItem ] = items[ sItem ]
@@ -1223,7 +1222,7 @@ local function simulate()
 
                     -- Spawn monsters
                     if room.nMonsters < 2 and
-                       ((h == 0 and not isSunny() and not room.items["a torch"]) or room.dark) and
+                       (h == 0 and not isSunny() and not room.items["a torch"] or room.dark) and
                        math.random(1, 6) == 1 then
 
                         local sMonster = tMonsters[ math.random(1, #tMonsters) ]
@@ -1240,7 +1239,7 @@ local function simulate()
 
                     -- Burn monsters
                     if h == 0 and isSunny() then
-                        for n,sMonster in ipairs( tMonsters ) do
+                        for _, sMonster in ipairs( tMonsters ) do
                             if room.items[sMonster] and items[sMonster].nocturnal then
                                 room.items[sMonster] = nil
                                    if sx == 0 and sy == 0 and sz == 0 and not room.dark then
@@ -1258,10 +1257,10 @@ local function simulate()
     -- Make monsters attack
     local room = getRoom( x, y, z )
     if nTimeInRoom >= 2 and not bNewMonstersThisRoom then
-        for n,sMonster in ipairs( tMonsters ) do
+        for _, sMonster in ipairs( tMonsters ) do
             if room.items[sMonster] then
                 if math.random(1, 4) == 1 and
-                   not (y == 0 and isSunny() and (sMonster == "a spider")) then
+                   not (y == 0 and isSunny() and sMonster == "a spider") then
                     if sMonster == "a creeper" then
                         if room.dark then
                             print( "A creeper explodes." )

src/main/resources/assets/computercraft/lua/rom/programs/fun/dj.lua

@@ -23,7 +23,7 @@ elseif sCommand == "play" or sCommand == nil then
     if sName == nil then
         -- No disc specified, pick one at random
         local tNames = {}
-        for n,sName in ipairs( peripheral.getNames() ) do
+        for _, sName in ipairs( peripheral.getNames() ) do
             if disk.isPresent( sName ) and disk.hasAudio( sName ) then
                 table.insert( tNames, sName )
             end

src/main/resources/assets/computercraft/lua/rom/programs/fun/worm.lua

@@ -2,15 +2,13 @@
 -- Display the start screen
 local w, h = term.getSize()
 
-local titleColour, headingColour, textColour, wormColour, fruitColour
+local headingColour, textColour, wormColour, fruitColour
 if term.isColour() then
-    titleColour = colours.red
     headingColour = colours.yellow
     textColour = colours.white
     wormColour = colours.green
     fruitColour = colours.red
 else
-    titleColour = colours.white
     headingColour = colours.white
     textColour = colours.white
     wormColour = colours.white
@@ -18,7 +16,7 @@ else
 end
 
 local function printCentred( y, s )
-    local x = math.floor((w - string.len(s)) / 2)
+    local x = math.floor((w - #s) / 2)
     term.setCursorPos(x, y)
     --term.clearLine()
     term.write( s )
@@ -27,8 +25,6 @@ end
 local xVel, yVel = 1, 0
 local xPos, yPos = math.floor(w / 2), math.floor(h / 2)
 local pxVel, pyVel = nil, nil
-
-local nLength = 1
 local nExtraLength = 6
 local bRunning = true
 
@@ -58,7 +54,7 @@ local tFruits = {
     "q", "r", "s", "t", "u", "v", "w", "x",
     "y", "z",
     "1", "2", "3", "4", "5", "6", "7", "8", "9", "0",
-    "@", "$", "%", "#", "&", "!", "?", "+", "*", "~"
+    "@", "$", "%", "#", "&", "!", "?", "+", "*", "~",
 }
 
 local function addFruit()
@@ -103,7 +99,6 @@ local function drawMenu()
 end
 
 local function update( )
-    local x,y = xPos,yPos
     if pxVel and pyVel then
         xVel, yVel = pxVel, pyVel
         pxVel, pyVel = nil, nil
@@ -190,7 +185,7 @@ end
 drawMenu()
 drawFrontend()
 while true do
-    local e,key = os.pullEvent( "key" )
+    local _, key = os.pullEvent( "key" )
     if key == keys.up or key == keys.w then
         -- Up
         if nDifficulty > 1 then
@@ -228,7 +223,7 @@ addFruit()
 -- Play the game
 local timer = os.startTimer(0)
 while bRunning do
-    local event, p1, p2 = os.pullEvent()
+    local event, p1 = os.pullEvent()
     if event == "timer" and p1 == timer then
         timer = os.startTimer(nInterval)
         update( false )

src/main/resources/assets/computercraft/lua/rom/programs/gps.lua

@@ -28,7 +28,7 @@ elseif sCommand == "host" then
 
     -- Find a modem
     local sModemSide = nil
-    for n,sSide in ipairs( rs.getSides() ) do
+    for _, sSide in ipairs( rs.getSides() ) do
         if peripheral.getType( sSide ) == "modem" and peripheral.call( sSide, "isWireless" ) then
             sModemSide = sSide
             break
@@ -80,7 +80,7 @@ elseif sCommand == "host" then
                 -- Print the number of requests handled
                 nServed = nServed + 1
                 if nServed > 1 then
-                    local x,y = term.getCursorPos()
+                    local _, y = term.getCursorPos()
                     term.setCursorPos(1, y - 1)
                 end
                 print( nServed .. " GPS requests served" )

src/main/resources/assets/computercraft/lua/rom/programs/help.lua

@@ -14,7 +14,7 @@ if sTopic == "index" then
 end
 
 local sFile = help.lookup( sTopic )
-local file = ((sFile ~= nil) and io.open( sFile )) or nil
+local file = sFile ~= nil and io.open( sFile ) or nil
 if file then
     local sContents = file:read("*a")
     file:close()

src/main/resources/assets/computercraft/lua/rom/programs/list.lua

@@ -18,7 +18,7 @@ local tFiles = {}
 local tDirs = {}
 
 local bShowHidden = settings.get( "list.show_hidden" )
-for n, sItem in pairs( tAll ) do
+for _, sItem in pairs( tAll ) do
     if bShowHidden or string.sub( sItem, 1, 1 ) ~= "." then
         local sPath = fs.combine( sDir, sItem )
         if fs.isDir( sPath ) then

src/main/resources/assets/computercraft/lua/rom/programs/lua.lua

@@ -67,7 +67,7 @@ while bRunning do
 
     local nForcePrint = 0
     local func, e = load( s, "=lua", "t", tEnv )
-    local func2, e2 = load( "return _echo("..s..");", "=lua", "t", tEnv )
+    local func2 = load( "return _echo(" .. s .. ");", "=lua", "t", tEnv )
     if not func then
         if func2 then
             func = func2
@@ -84,7 +84,7 @@ while bRunning do
         local tResults = table.pack( pcall( func ) )
         if tResults[1] then
             local n = 1
-            while n < tResults.n or (n <= nForcePrint) do
+            while n < tResults.n or n <= nForcePrint do
                 local value = tResults[ n + 1 ]
                 if type( value ) == "table" then
                     local metatable = getmetatable( value )

src/main/resources/assets/computercraft/lua/rom/programs/move.lua

@@ -9,7 +9,7 @@ local sSource = shell.resolve( tArgs[1] )
 local sDest = shell.resolve( tArgs[2] )
 local tFiles = fs.find( sSource )
 if #tFiles > 0 then
-    for n,sFile in ipairs( tFiles ) do
+    for _, sFile in ipairs( tFiles ) do
         if fs.isDir( sDest ) then
             fs.move( sFile, fs.combine( sDest, fs.getName(sFile) ) )
         elseif #tFiles == 1 then

src/main/resources/assets/computercraft/lua/rom/programs/pocket/falling.lua

@@ -10,16 +10,16 @@ end
 
 local block_s1 = {
     {
-      { 1,0,0,0, },
-      { 1,1,0,0, },
-      { 0,1,0,0, },
-      { 0,0,0,0, },
+      { 1, 0, 0, 0 },
+      { 1, 1, 0, 0 },
+      { 0, 1, 0, 0 },
+      { 0, 0, 0, 0 },
     },
     {
-      { 0,0,0,0, },
-      { 0,1,1,0, },
-      { 1,1,0,0, },
-      { 0,0,0,0, },
+      { 0, 0, 0, 0 },
+      { 0, 1, 1, 0 },
+      { 1, 1, 0, 0 },
+      { 0, 0, 0, 0 },
     },
     ch = colorass("  ", "{}"),
     fg = colorass(colors.blue, colors.black),
@@ -27,16 +27,16 @@ local block_s1= {
   }
 local block_s2 = {
     {
-      { 0,1,0,0, },
-      { 1,1,0,0, },
-      { 1,0,0,0, },
-      { 0,0,0,0, },
+      { 0, 1, 0, 0 },
+      { 1, 1, 0, 0 },
+      { 1, 0, 0, 0 },
+      { 0, 0, 0, 0 },
     },
     {
-      { 0,0,0,0, },
-      { 1,1,0,0, },
-      { 0,1,1,0, },
-      { 0,0,0,0, },
+      { 0, 0, 0, 0 },
+      { 1, 1, 0, 0 },
+      { 0, 1, 1, 0 },
+      { 0, 0, 0, 0 },
     },
     ch = colorass("  ", "{}"),
     fg = colorass(colors.green, colors.black),
@@ -44,16 +44,16 @@ local block_s2= {
   }
 local block_line = {
     {
-      { 0,1,0,0, },
-      { 0,1,0,0, },
-      { 0,1,0,0, },
-      { 0,1,0,0, },
+      { 0, 1, 0, 0 },
+      { 0, 1, 0, 0 },
+      { 0, 1, 0, 0 },
+      { 0, 1, 0, 0 },
     },
     {
-      { 0,0,0,0, },
-      { 1,1,1,1, },
-      { 0,0,0,0, },
-      { 0,0,0,0, },
+      { 0, 0, 0, 0 },
+      { 1, 1, 1, 1 },
+      { 0, 0, 0, 0 },
+      { 0, 0, 0, 0 },
     },
     ch = colorass("  ", "[]"),
     fg = colorass(colors.pink, colors.black),
@@ -61,10 +61,10 @@ local block_line = {
   }
 local block_square = {
     {
-      { 1,1,0,0, },
-      { 1,1,0,0, },
-      { 0,0,0,0, },
-      { 0,0,0,0, },
+      { 1, 1, 0, 0 },
+      { 1, 1, 0, 0 },
+      { 0, 0, 0, 0 },
+      { 0, 0, 0, 0 },
     },
     ch = colorass("  ", "[]"),
     fg = colorass(colors.lightBlue, colors.black),
@@ -72,28 +72,28 @@ local block_square = {
   }
 local block_L1 = {
     {
-      { 1,1,0,0, },
-      { 0,1,0,0, },
-      { 0,1,0,0, },
-      { 0,0,0,0, },
+      { 1, 1, 0, 0 },
+      { 0, 1, 0, 0 },
+      { 0, 1, 0, 0 },
+      { 0, 0, 0, 0 },
     },
     {
-      { 0,0,0,0, },
-      { 1,1,1,0, },
-      { 1,0,0,0, },
-      { 0,0,0,0, },
+      { 0, 0, 0, 0 },
+      { 1, 1, 1, 0 },
+      { 1, 0, 0, 0 },
+      { 0, 0, 0, 0 },
     },
     {
-      { 0,1,0,0, },
-      { 0,1,0,0, },
-      { 0,1,1,0, },
-      { 0,0,0,0, },
+      { 0, 1, 0, 0 },
+      { 0, 1, 0, 0 },
+      { 0, 1, 1, 0 },
+      { 0, 0, 0, 0 },
     },
     {
-      { 0,0,1,0, },
-      { 1,1,1,0, },
-      { 0,0,0,0, },
-      { 0,0,0,0, },
+      { 0, 0, 1, 0 },
+      { 1, 1, 1, 0 },
+      { 0, 0, 0, 0 },
+      { 0, 0, 0, 0 },
     },
     ch = colorass("  ", "()"),
     fg = colorass(colors.orange, colors.black),
@@ -101,28 +101,28 @@ local block_L1 = {
   }
 local block_L2 = {
     {
-      { 0,1,0,0, },
-      { 0,1,0,0, },
-      { 1,1,0,0, },
-      { 0,0,0,0, },
+      { 0, 1, 0, 0 },
+      { 0, 1, 0, 0 },
+      { 1, 1, 0, 0 },
+      { 0, 0, 0, 0 },
     },
     {
-      { 0,0,0,0, },
-      { 1,1,1,0, },
-      { 0,0,1,0, },
-      { 0,0,0,0, },
+      { 0, 0, 0, 0 },
+      { 1, 1, 1, 0 },
+      { 0, 0, 1, 0 },
+      { 0, 0, 0, 0 },
     },
     {
-      { 0,1,1,0, },
-      { 0,1,0,0, },
-      { 0,1,0,0, },
-      { 0,0,0,0, },
+      { 0, 1, 1, 0 },
+      { 0, 1, 0, 0 },
+      { 0, 1, 0, 0 },
+      { 0, 0, 0, 0 },
     },
     {
-      { 1,0,0,0, },
-      { 1,1,1,0, },
-      { 0,0,0,0, },
-      { 0,0,0,0, },
+      { 1, 0, 0, 0 },
+      { 1, 1, 1, 0 },
+      { 0, 0, 0, 0 },
+      { 0, 0, 0, 0 },
     },
     ch = colorass("  ", "()"),
     fg = colorass(colors.brown, colors.black),
@@ -130,28 +130,28 @@ local block_L2 = {
   }
 local block_T = {
     {
-      { 0,1,0,0, },
-      { 1,1,0,0, },
-      { 0,1,0,0, },
-      { 0,0,0,0, },
+      { 0, 1, 0, 0 },
+      { 1, 1, 0, 0 },
+      { 0, 1, 0, 0 },
+      { 0, 0, 0, 0 },
     },
     {
-      { 0,0,0,0, },
-      { 1,1,1,0, },
-      { 0,1,0,0, },
-      { 0,0,0,0, },
+      { 0, 0, 0, 0 },
+      { 1, 1, 1, 0 },
+      { 0, 1, 0, 0 },
+      { 0, 0, 0, 0 },
     },
     {
-      { 0,1,0,0, },
-      { 0,1,1,0, },
-      { 0,1,0,0, },
-      { 0,0,0,0, },
+      { 0, 1, 0, 0 },
+      { 0, 1, 1, 0 },
+      { 0, 1, 0, 0 },
+      { 0, 0, 0, 0 },
     },
     {
-      { 0,1,0,0, },
-      { 1,1,1,0, },
-      { 0,0,0,0, },
-      { 0,0,0,0, },
+      { 0, 1, 0, 0 },
+      { 1, 1, 1, 0 },
+      { 0, 0, 0, 0 },
+      { 0, 0, 0, 0 },
     },
     ch = colorass("  ", "<>"),
     fg = colorass(colors.cyan, colors.black),
@@ -424,7 +424,7 @@ local function playGame()
     end
 
     if #rows > 0 then
-      for i=1,4 do
+      for _ = 1, 4 do
         sleep(.1)
         for r = 1, #rows do
           r = rows[r]
@@ -469,7 +469,6 @@ local function playGame()
   end
 
   local function blockFall()
-    local result = false
     if testBlockAt(curBlock, curX, curY + 1, curRot) then
       pitBlock(curBlock, curX, curY, curRot)
       --detect rows that clear
@@ -524,16 +523,16 @@ local function playGame()
         dropTimer = os.startTimer(dropSpeed)
       end
       if dx + dr ~= 0 then
-        if not testBlockAt(curBlock,curX+dx,curY+dy,(dr>0 and curRot%#curBlock+dr or curRot)) then
+        if not testBlockAt(curBlock, curX + dx, curY + dy, dr > 0 and curRot % #curBlock + dr or curRot) then
           eraseBlockAt(curBlock, curX, curY, curRot)
           curX = curX + dx
           curY = curY + dy
-          curRot=dr==0 and curRot or (curRot%#curBlock+dr)
+          curRot = dr == 0 and curRot or curRot % #curBlock + dr
           drawBlockAt(curBlock, curX, curY, curRot)
         end
       end
     elseif e[1] == "term_resize" then
-      local w,h=term.getSize()
+      local _, h = term.getSize()
       if h == 20 then
         heightAdjust = 0
       else
@@ -617,7 +616,7 @@ local function runMenu()
         level = math.max(level - 1, 1)
         drawMenu()
       elseif key >= keys.one and key <= keys.nine and selected == 1 then
-        level=(key-keys.one) + 1
+        level = key - keys.one + 1
         drawMenu()
       elseif key == keys.up or key == keys.w then
         selected = selected - 1

src/main/resources/assets/computercraft/lua/rom/programs/rednet/chat.lua

@@ -9,7 +9,7 @@ end
 
 local sOpenedModem = nil
 local function openModem()
-    for n,sModem in ipairs( peripheral.getNames() ) do
+    for _, sModem in ipairs( peripheral.getNames() ) do
         if peripheral.getType( sModem ) == "modem" then
             if not rednet.isOpen( sModem ) then
                 rednet.open( sModem )
@@ -94,7 +94,7 @@ if sCommand == "host" then
     end
 
     local function printUsers()
-        local x,y = term.getCursorPos()
+        local _, y = term.getCursorPos()
         term.setCursorPos( 1, y - 1 )
         term.clearLine()
         if nUsers == 1 then
@@ -108,7 +108,7 @@ if sCommand == "host" then
     local ok, error = pcall( function()
         parallel.waitForAny( function()
             while true do
-                local sEvent, timer = os.pullEvent( "timer" )
+                local _, timer = os.pullEvent( "timer" )
                 local nUserID = tPingPongTimer[ timer ]
                 if nUserID and tUsers[ nUserID ] then
                     local tUser = tUsers[ nUserID ]
@@ -130,14 +130,14 @@ if sCommand == "host" then
                 local tCommands
                 tCommands = {
                     ["me"] = function( tUser, sContent )
-                        if string.len(sContent) > 0 then
+                        if #sContent > 0 then
                             send( "* " .. tUser.sUsername .. " " .. sContent )
                         else
                             send( "* Usage: /me [words]", tUser.nUserID )
                         end
                     end,
                     ["nick"] = function( tUser, sContent )
-                        if string.len(sContent) > 0 then
+                        if #sContent > 0 then
                             local sOldName = tUser.sUsername
                             tUser.sUsername = sContent
                             send( "* " .. sOldName .. " is now known as " .. tUser.sUsername )
@@ -148,7 +148,7 @@ if sCommand == "host" then
                     ["users"] = function( tUser, sContent )
                         send( "* Connected Users:", tUser.nUserID )
                         local sUsers = "*"
-                        for nUserID, tUser in pairs( tUsers ) do
+                        for _, tUser in pairs( tUsers ) do
                             sUsers = sUsers .. " " .. tUser.sUsername
                         end
                         send( sUsers, tUser.nUserID )
@@ -156,7 +156,7 @@ if sCommand == "host" then
                     ["help"] = function( tUser, sContent )
                         send( "* Available commands:", tUser.nUserID )
                         local sCommands = "*"
-                        for sCommand, fnCommand in pairs( tCommands ) do
+                        for sCommand in pairs( tCommands ) do
                             sCommands = sCommands .. " /" .. sCommand
                         end
                         send( sCommands .. " /logout", tUser.nUserID )
@@ -199,7 +199,7 @@ if sCommand == "host" then
                                     if sCommand then
                                         local fnCommand = tCommands[ sCommand ]
                                         if fnCommand then
-                                            local sContent = string.sub( sMessage, string.len(sCommand)+3 )
+                                            local sContent = string.sub( sMessage, #sCommand + 3 )
                                             fnCommand( tUser, sContent )
                                         else
                                             send( "* Unrecognised command: /" .. sCommand, tUser.nUserID )
@@ -297,11 +297,10 @@ elseif sCommand == "join" then
     promptWindow.restoreCursor()
 
     local function drawTitle()
-        local x,y = titleWindow.getCursorPos()
-        local w,h = titleWindow.getSize()
+        local w = titleWindow.getSize()
         local sTitle = sUsername .. " on " .. sHostname
         titleWindow.setTextColour( highlightColour )
-        titleWindow.setCursorPos( math.floor( w/2 - string.len(sTitle)/2 ), 1 )
+        titleWindow.setCursorPos( math.floor( w / 2 - #sTitle / 2 ), 1 )
         titleWindow.clearLine()
         titleWindow.write( sTitle )
         promptWindow.restoreCursor()
@@ -322,7 +321,7 @@ elseif sCommand == "join" then
                 term.setTextColour( highlightColour )
                 write( sUsernameBit )
                 term.setTextColour( textColour )
-                write( string.sub( sMessage, string.len( sUsernameBit ) + 1 ) )
+                write( string.sub( sMessage, #sUsernameBit + 1 ) )
             else
                 write( sMessage )
             end
@@ -410,7 +409,7 @@ elseif sCommand == "join" then
     term.redirect( parentTerm )
 
     -- Print error notice
-    local w,h = term.getSize()
+    local _, h = term.getSize()
     term.setCursorPos( 1, h )
     term.clearLine()
     term.setCursorBlink( false )

src/main/resources/assets/computercraft/lua/rom/programs/rednet/repeat.lua

@@ -1,7 +1,7 @@
 
 -- Find modems
 local tModems = {}
-for n,sModem in ipairs( peripheral.getNames() ) do
+for _, sModem in ipairs( peripheral.getNames() ) do
     if peripheral.getType( sModem ) == "modem" then
         table.insert( tModems, sModem )
     end
@@ -59,7 +59,7 @@ local ok, error = pcall( function()
 
                         -- Log the event
                         nTransmittedMessages = nTransmittedMessages + 1
-                        local x,y = term.getCursorPos()
+                        local _, y = term.getCursorPos()
                         term.setCursorPos( 1, y - 1 )
                         term.clearLine()
                         if nTransmittedMessages == 1 then

src/main/resources/assets/computercraft/lua/rom/programs/redstone.lua

@@ -17,7 +17,7 @@ if sCommand == "probe" then
 
     local count = 0
     local bundledCount = 0
-    for n,sSide in ipairs( redstone.getSides() ) do
+    for _, sSide in ipairs( redstone.getSides() ) do
         if redstone.getBundledInput( sSide ) > 0 then
             bundledCount = bundledCount + 1
         end
@@ -39,7 +39,7 @@ if sCommand == "probe" then
     if bundledCount > 0 then
         print()
         print( "Bundled inputs:" )
-        for i,sSide in ipairs( redstone.getSides() ) do
+        for _, sSide in ipairs( redstone.getSides() ) do
             local nInput = redstone.getBundledInput( sSide )
             if nInput ~= 0 then
                 write( sSide .. ": " )
@@ -69,7 +69,7 @@ elseif sCommand == "pulse" then
     local sSide = tArgs[2]
     local nCount = tonumber( tArgs[3] ) or 1
     local nPeriod = tonumber( tArgs[4] ) or 0.5
-    for n=1,nCount do
+    for _ = 1, nCount do
         redstone.setOutput( sSide, true )
         sleep( nPeriod / 2 )
         redstone.setOutput( sSide, false )

src/main/resources/assets/computercraft/lua/rom/programs/set.lua

@@ -2,7 +2,7 @@
 local tArgs = { ... }
 if #tArgs == 0 then
     -- "set"
-    local x,y = term.getCursorPos()
+    local _, y = term.getCursorPos()
     local tSettings = {}
     for n, sName in ipairs( settings.getNames() ) do
         tSettings[n] = textutils.serialize(sName) .. " is " .. textutils.serialize(settings.get(sName))

src/main/resources/assets/computercraft/lua/rom/programs/shell.lua

@@ -9,10 +9,10 @@ if multishell then
 end
 
 local bExit = false
-local sDir = (parentShell and parentShell.dir()) or ""
-local sPath = (parentShell and parentShell.path()) or ".:/rom/programs"
-local tAliases = (parentShell and parentShell.aliases()) or {}
-local tCompletionInfo = (parentShell and parentShell.getCompletionInfo()) or {}
+local sDir = parentShell and parentShell.dir() or ""
+local sPath = parentShell and parentShell.path() or ".:/rom/programs"
+local tAliases = parentShell and parentShell.aliases() or {}
+local tCompletionInfo = parentShell and parentShell.getCompletionInfo() or {}
 local tProgramStack = {}
 
 local shell = {}
@@ -70,7 +70,7 @@ local function createShellEnv( sDir )
                 end
             end
             return nil, sError
-        end
+        end,
     }
 
     local sentinel = {}
@@ -287,7 +287,7 @@ function shell.programs( _bIncludeHidden )
 
     -- Sort and return
     local tItemList = {}
-    for sItem, b in pairs( tItems ) do
+    for sItem in pairs( tItems ) do
         table.insert( tItemList, sItem )
     end
     table.sort( tItemList )
@@ -304,7 +304,7 @@ local function completeProgram( sLine )
         local tSeen = {}
 
         -- Add aliases
-        for sAlias, sCommand in pairs( tAliases ) do
+        for sAlias in pairs( tAliases ) do
             if #sAlias > #sLine and string.sub( sAlias, 1, #sLine ) == sLine then
                 local sResult = string.sub( sAlias, #sLine + 1 )
                 if not tSeen[ sResult ] then
@@ -397,7 +397,7 @@ function shell.setCompletionFunction( sProgram, fnComplete )
     expect(1, sProgram, "string")
     expect(2, fnComplete, "function")
     tCompletionInfo[ sProgram ] = {
-        fnComplete = fnComplete
+        fnComplete = fnComplete,
     }
 end
 

src/main/resources/assets/computercraft/lua/rom/programs/turtle/dance.lua

@@ -81,7 +81,7 @@ textutils.slowWrite( "Preparing to get down." )
 textutils.slowPrint( "..", 0.75 )
 
 local sAudio = nil
-for n,sName in pairs( peripheral.getNames() ) do
+for _, sName in pairs( peripheral.getNames() ) do
     if disk.hasAudio( sName ) then
         disk.playAudio( sName )
         print( "Jamming to " .. disk.getAudioTitle( sName ) )
@@ -95,7 +95,7 @@ print( "Press any key to stop the groove" )
 parallel.waitForAny(
     function()
         while not bEnd do
-            local event, key = os.pullEvent("key")
+            local _, key = os.pullEvent("key")
             if key ~= keys.escape then
                 return
             end

src/main/resources/assets/computercraft/lua/rom/programs/turtle/excavate.lua

@@ -81,7 +81,7 @@ local function collect()
     if nTotalItems > collected then
         collected = nTotalItems
         if math.fmod(collected + unloaded, 50) == 0 then
-            print( "Mined "..(collected + unloaded).." items." )
+            print( "Mined " .. collected + unloaded .. " items." )
         end
     end
 
@@ -98,9 +98,8 @@ function refuel( ammount )
         return true
     end
 
-    local needed = ammount or (xPos + zPos + depth + 2)
+    local needed = ammount or xPos + zPos + depth + 2
     if turtle.getFuelLevel() < needed then
-        local fueled = false
         for n = 1, 16 do
             if turtle.getItemCount(n) > 0 then
                 turtle.select(n)
@@ -292,7 +291,7 @@ local alternate = 0
 local done = false
 while not done do
     for n = 1, size do
-        for m=1,size-1 do
+        for _ = 1, size - 1 do
             if not tryForwards() then
                 done = true
                 break
@@ -354,4 +353,4 @@ if reseal then
     turtle.placeDown()
 end
 
-print( "Mined "..(collected + unloaded).." items total." )
+print( "Mined " .. collected + unloaded .. " items total." )

src/main/resources/assets/computercraft/lua/rom/programs/turtle/refuel.lua

@@ -23,7 +23,7 @@ end
 if turtle.getFuelLevel() ~= "unlimited" then
     for n = 1, 16 do
         -- Stop if we've reached the limit, or are fully refuelled.
-        if (nLimit and nLimit <= 0) or turtle.getFuelLevel() >= turtle.getFuelLimit() then
+        if nLimit and nLimit <= 0 or turtle.getFuelLevel() >= turtle.getFuelLimit() then
             break
         end
 

src/main/resources/assets/computercraft/lua/rom/programs/turtle/tunnel.lua

@@ -15,8 +15,6 @@ if length < 1 then
     print( "Tunnel length must be positive" )
     return
 end
-
-local depth = 0
 local collected = 0
 
 local function collect()

src/main/resources/assets/computercraft/lua/rom/programs/turtle/turn.lua

@@ -31,7 +31,7 @@ while nArg <= #tArgs do
 
     local fnHandler = tHandlers[string.lower(sDirection)]
     if fnHandler then
-        for n=1,nDistance do
+        for _ = 1, nDistance do
             fnHandler( nArg )
         end
     else

src/main/resources/assets/computercraft/lua/rom/startup.lua

@@ -163,7 +163,7 @@ if settings.get( "shell.allow_startup" ) then
     tUserStartups = findStartups( "/" )
 end
 if settings.get( "shell.allow_disk_startup" ) then
-    for n,sName in pairs( peripheral.getNames() ) do
+    for _, sName in pairs( peripheral.getNames() ) do
         if disk.isPresent( sName ) and disk.hasData( sName ) then
             local startups = findStartups( disk.getMountPath( sName ) )
             if startups then

src/test/resources/test-rom/mcfly.lua

@@ -11,19 +11,19 @@
 
 --- Assert an argument to the given function has the specified type.
 --
--- @tparam string The function's name
--- @tparam int    The argument index to this function
--- @tparam string The type this argument should have. May be 'value' for any
---                non-nil value.
--- @param val     The value to check
--- @raise If this value doesn't match the expected type.
-local function check(func, arg, ty, val)
+-- @tparam string func The function's name
+-- @tparam int    idx  The argument index to this function
+-- @tparam string ty   The type this argument should have. May be 'value' for 
+--                     any non-nil value.
+-- @param val     val  The value to check
+-- @throws If this value doesn't match the expected type.
+local function check(func, idx, ty, val)
     if ty == 'value' then
         if val == nil then
-            error(('%s: bad argument #%d (got nil)'):format(func, arg), 3)
+            error(('%s: bad argument #%d (got nil)'):format(func, idx), 3)
         end
     elseif type(val) ~= ty then
-        return error(('%s: bad argument #%d (expected %s, got %s)'):format(func, arg, ty, type(val)), 3)
+        return error(('%s: bad argument #%d (expected %s, got %s)'):format(func, idx, ty, type(val)), 3)
     end
 end
 
@@ -122,7 +122,7 @@ local error_mt = { __tostring = function(self) return self.message end }
 --- Attempt to execute the provided function, gathering a stack trace when it
 -- errors.
 --
--- @tparam
+-- @tparam function() fn The function to run
 -- @return[1] true
 -- @return[2] false
 -- @return[2] The error object
@@ -170,7 +170,7 @@ end
 --- Fail a test with the given message
 --
 -- @tparam string message The message to fail with
--- @raises An error with the given message
+-- @throws An error with the given message
 local function fail(message)
     check('fail', 1, 'string', message)
     error(setmetatable({ message = message, fail = true }, error_mt))
@@ -192,7 +192,7 @@ expect_mt.__index = expect_mt
 --- Assert that this expectation has the provided value
 --
 -- @param value The value to require this expectation to be equal to
--- @raises If the values are not equal
+-- @throws If the values are not equal
 function expect_mt:equals(value)
     if value ~= self.value then
         fail(("Expected %s\n but got %s"):format(format(value), format(self.value)))
@@ -206,7 +206,7 @@ expect_mt.eq = expect_mt.equals
 --- Assert that this expectation does not equal the provided value
 --
 -- @param value The value to require this expectation to not be equal to
--- @raises If the values are equal
+-- @throws If the values are equal
 function expect_mt:not_equals(value)
     if value == self.value then
         fail(("Expected any value but %s"):format(format(value)))
@@ -220,7 +220,7 @@ expect_mt.ne = expect_mt.not_equals
 --- Assert that this expectation has something of the provided type
 --
 -- @tparam string exp_type The type to require this expectation to have
--- @raises If it does not have that thpe
+-- @throws If it does not have that thpe
 function expect_mt:type(exp_type)
     local actual_type = type(self.value)
     if exp_type ~= actual_type then
@@ -270,7 +270,7 @@ end
 -- the provided object.
 --
 -- @param value The value to check for structural equivalence
--- @raises If they are not equivalent
+-- @throws If they are not equivalent
 function expect_mt:same(value)
     if not matches({}, true, self.value, value) then
         fail(("Expected %s\n but got %s"):format(format(value), format(self.value)))
@@ -283,7 +283,7 @@ end
 -- in the provided object.
 --
 -- @param value The value to check against
--- @raises If this does not match the provided value
+-- @throws If this does not match the provided value
 function expect_mt:matches(value)
     if not matches({}, false, value, self.value) then
         fail(("Expected %s\nto match %s"):format(format(self.value), format(value)))
@@ -296,7 +296,7 @@ end
 --
 -- @tparam[opt] number The exact number of times the function must be called.
 -- If not given just require the function to be called at least once.
--- @raises If this function was not called the expected number of times.
+-- @throws If this function was not called the expected number of times.
 function expect_mt:called(times)
     if getmetatable(self.value) ~= stub_mt or self.value.arguments == nil then
         fail(("Expected stubbed function, got %s"):format(type(self.value)))
@@ -380,7 +380,7 @@ local expect = setmetatable( {
     -- @return The new expectation
     __call = function(_, value)
         return setmetatable({ value = value }, expect_mt)
-    end
+    end,
 })
 
 --- The stack of "describe"s.
@@ -623,7 +623,7 @@ end
 -- And some summary statistics
 local actual_count = tests_run - test_status.pending
 local info = ("Ran %s test(s), of which %s passed (%g%%).")
-    :format(actual_count, test_status.pass, (test_status.pass / actual_count) * 100)
+    :format(actual_count, test_status.pass, test_status.pass / actual_count * 100)
 
 if test_status.pending > 0 then
     info = info .. (" Skipped %d pending test(s)."):format(test_status.pending)

src/test/resources/test-rom/spec/apis/gps_spec.lua

@@ -2,7 +2,7 @@ describe("The gps library", function()
     describe("gps.locate", function()
         it("validates arguments", function()
             stub(_G, "commands", { getBlockPosition = function()
-            end })
+            end, })
 
             gps.locate()
             gps.locate(1)

src/test/resources/test-rom/spec/apis/io_spec.lua

@@ -60,10 +60,10 @@ describe("The io library", function()
 
         expect(io.output():seek()):equal(0)
         assert(io.write("alo alo"))
-        expect(io.output():seek()):equal(#("alo alo"))
-        expect(io.output():seek("cur", -3)):equal(#("alo alo") - 3)
+        expect(io.output():seek()):equal(#"alo alo")
+        expect(io.output():seek("cur", -3)):equal(#"alo alo" - 3)
         assert(io.write("joao"))
-        expect(io.output():seek("end"):equal(#("alo joao")))
+        expect(io.output():seek("end"):equal(#"alo joao"))
 
         expect(io.output():seek("set")):equal(0)
 

src/test/resources/test-rom/spec/base_spec.lua

@@ -70,7 +70,7 @@ describe("The Lua base library", function()
 
         it("does not prefix for unnamed chunks", function()
             local info = debug.getinfo(loadstring("return 1"), "S")
-            expect(info):matches { short_src = '[string "return 1"]', source = "return 1", }
+            expect(info):matches { short_src = '[string "return 1"]', source = "return 1" }
         end)
 
         it("does not prefix when already prefixed", function()

src/test/resources/test-rom/spec/modules/cc/shell/completion_spec.lua

@@ -5,7 +5,7 @@ describe("cc.shell.completion", function()
         it("completes both", function()
             expect(c.dirOrFile(shell, "rom/")):same {
                 "apis/", "apis", "autorun/", "autorun", "help/", "help",
-                "modules/", "modules", "motd.txt", "programs/", "programs", "startup.lua"
+                "modules/", "modules", "motd.txt", "programs/", "programs", "startup.lua",
             }
         end)
 

src/test/resources/test-rom/spec/programs/command/commands_spec.lua

@@ -10,7 +10,7 @@ describe("The commands program", function()
     it("lists commands", function()
         local pagedTabulate = stub(textutils, "pagedTabulate", function(x) print(table.unpack(x)) end)
         stub(_G, "commands", {
-            list = function() return { "computercraft" } end
+            list = function() return { "computercraft" } end,
         })
 
         expect(capture(stub, "/rom/programs/command/commands.lua"))

src/test/resources/test-rom/spec/programs/command/exec_spec.lua

@@ -15,7 +15,7 @@ describe("The exec program", function()
 
     it("runs a command", function()
         stub(_G, "commands", {
-            exec = function() return true, {"Hello World!"} end
+            exec = function() return true, {"Hello World!"} end,
         })
 
         expect(capture(stub, "/rom/programs/command/exec.lua computercraft"))
@@ -24,7 +24,7 @@ describe("The exec program", function()
 
     it("reports command failures", function()
         stub(_G, "commands", {
-            exec = function() return false, {"Hello World!"} end
+            exec = function() return false, {"Hello World!"} end,
         })
 
         expect(capture(stub, "/rom/programs/command/exec.lua computercraft"))

src/test/resources/test-rom/spec/programs/edit_spec.lua

@@ -1,5 +1,4 @@
 local capture = require "test_helpers".capture_program
-local testFile = require "test_helpers".testFile
 
 describe("The edit program", function()
 

src/test/resources/test-rom/spec/programs/http/pastebin_spec.lua

@@ -17,7 +17,7 @@ describe("The pastebin program", function()
                         local tHeader = {}
                         tHeader["Content-Type"] = "text/plain; charset=utf-8"
                         return tHeader
-                    end
+                    end,
                 }
             end,
             post = function()
@@ -28,7 +28,7 @@ describe("The pastebin program", function()
                     close = function()
                     end,
                 }
-            end
+            end,
         })
     end
 

src/test/resources/test-rom/spec/programs/http/wget_spec.lua

@@ -14,7 +14,7 @@ describe("The wget program", function()
                     close = function()
                     end,
                 }
-            end
+            end,
         })
     end
 

src/test/resources/test-rom/spec/programs/pocket/equip_spec.lua

@@ -9,7 +9,7 @@ describe("The pocket equip program", function()
 
     it("can equip an upgrade", function()
         stub(_G, "pocket", {
-            equipBack = function() return true end
+            equipBack = function() return true end,
         })
 
         expect(capture(stub, "/rom/programs/pocket/equip.lua"))
@@ -18,7 +18,7 @@ describe("The pocket equip program", function()
 
     it("handles when an upgrade cannot be equipped", function()
         stub(_G, "pocket", {
-            equipBack = function() return false, "Cannot equip this item." end
+            equipBack = function() return false, "Cannot equip this item." end,
         })
 
         expect(capture(stub, "/rom/programs/pocket/equip.lua"))

src/test/resources/test-rom/spec/programs/pocket/unequip_spec.lua

@@ -9,7 +9,7 @@ describe("The pocket unequip program", function()
 
     it("unequips an upgrade", function()
         stub(_G, "pocket", {
-            unequipBack = function() return true end
+            unequipBack = function() return true end,
         })
 
         expect(capture(stub, "/rom/programs/pocket/unequip.lua"))
@@ -18,7 +18,7 @@ describe("The pocket unequip program", function()
 
     it("handles when an upgrade cannot be equipped", function()
         stub(_G, "pocket", {
-            unequipBack = function() return false, "Nothing to remove." end
+            unequipBack = function() return false, "Nothing to remove." end,
         })
 
         expect(capture(stub, "/rom/programs/pocket/unequip.lua"))

src/test/resources/test-rom/spec/programs/turtle/refuel_spec.lua

@@ -17,7 +17,7 @@ describe("The refuel program", function()
             end,
             getFuelLimit = function()
                 return fuel_limit
-            end
+            end,
         })
     end
 

src/test/resources/test-rom/spec/programs/turtle/unequip_spec.lua

@@ -21,7 +21,7 @@ describe("The turtle unequip program", function()
             select = function() end,
             getItemCount = function() return 0 end,
             equipRight = function() return true end,
-            equipLeft = function() return true end
+            equipLeft = function() return true end,
         })
 
         expect(capture(stub, "/rom/programs/turtle/unequip.lua left"))
@@ -42,7 +42,7 @@ describe("The turtle unequip program", function()
             equipLeft = function()
                 item_count = 1
                 return true
-            end
+            end,
         })
 
         expect(capture(stub, "/rom/programs/turtle/unequip.lua left"))
@@ -57,7 +57,7 @@ describe("The turtle unequip program", function()
             select = function() end,
             getItemCount = function() return 1 end,
             equipRight = function() return true end,
-            equipLeft = function() return true end
+            equipLeft = function() return true end,
         })
 
         expect(capture(stub, "/rom/programs/turtle/unequip.lua left"))

src/test/resources/test-rom/spec/test_helpers.lua

@@ -37,7 +37,7 @@ local function capture_program(stub, program, ...)
         output = table.concat(output),
         error = table.concat(error),
         combined = table.concat(combined),
-        ok = ok
+        ok = ok,
     }
 end