diff --git a/.editorconfig b/.editorconfig
index f04c87852..f11468850 100644
--- a/.editorconfig
+++ b/.editorconfig
@@ -11,5 +11,8 @@ insert_final_newline = true
 [*.md]
 trim_trailing_whitespace = false
 
+[*.sexp]
+indent_size = 2
+
 [*.properties]
 insert_final_newline = false
diff --git a/.github/workflows/main-ci.yml b/.github/workflows/main-ci.yml
index 16f34b3e2..0be633a53 100644
--- a/.github/workflows/main-ci.yml
+++ b/.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
+        GITHUB_TOKEN=${{ secrets.GITHUB_TOKEN }} bin/illuaminate lint --github
diff --git a/illuaminate.sexp b/illuaminate.sexp
new file mode 100644
index 000000000..2271a01e5
--- /dev/null
+++ b/illuaminate.sexp
@@ -0,0 +1,25 @@
+; -*- mode: Lisp;-*-
+
+(sources
+  /src/main/resources/assets/computercraft/lua/bios.lua
+  /src/main/resources/assets/computercraft/lua/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 two global linters 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:set-global -var:unused-global))
+
+;; These warnings are broken right now
+(at completion.lua (linters -doc:malformed-type))
+(at (bios.lua worm.lua) (linters -control:unreachable))
diff --git a/src/main/resources/assets/computercraft/lua/bios.lua b/src/main/resources/assets/computercraft/lua/bios.lua
index cebfe1fa3..e4b792538 100644
--- a/src/main/resources/assets/computercraft/lua/bios.lua
+++ b/src/main/resources/assets/computercraft/lua/bios.lua
@@ -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
 
@@ -233,7 +233,7 @@ function write( sText )
                         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
@@ -332,7 +332,7 @@ function read( _sReplaceChar, _tHistory, _fnComplete, _sDefault )
 
         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( #sLine - nScroll, 0 ) ) )
         else
@@ -544,7 +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()
@@ -775,7 +775,7 @@ 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
@@ -808,8 +808,8 @@ 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 )
@@ -836,9 +836,9 @@ 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 )
@@ -867,7 +867,7 @@ 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
@@ -881,7 +881,7 @@ 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
@@ -896,7 +896,7 @@ 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
@@ -946,7 +946,7 @@ 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" )
diff --git a/src/main/resources/assets/computercraft/lua/rom/apis/command/commands.lua b/src/main/resources/assets/computercraft/lua/rom/apis/command/commands.lua
index 849bf8e7c..7afd34bad 100644
--- a/src/main/resources/assets/computercraft/lua/rom/apis/command/commands.lua
+++ b/src/main/resources/assets/computercraft/lua/rom/apis/command/commands.lua
@@ -33,9 +33,9 @@ local tNonNBTJSONCommands = {
     [ "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 )
diff --git a/src/main/resources/assets/computercraft/lua/rom/apis/disk.lua b/src/main/resources/assets/computercraft/lua/rom/apis/disk.lua
index 637a48b07..2c5e6ec8b 100644
--- a/src/main/resources/assets/computercraft/lua/rom/apis/disk.lua
+++ b/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
diff --git a/src/main/resources/assets/computercraft/lua/rom/apis/gps.lua b/src/main/resources/assets/computercraft/lua/rom/apis/gps.lua
index 08f698eb2..aab023209 100644
--- a/src/main/resources/assets/computercraft/lua/rom/apis/gps.lua
+++ b/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
diff --git a/src/main/resources/assets/computercraft/lua/rom/apis/help.lua b/src/main/resources/assets/computercraft/lua/rom/apis/help.lua
index b4e69921f..853ec09a0 100644
--- a/src/main/resources/assets/computercraft/lua/rom/apis/help.lua
+++ b/src/main/resources/assets/computercraft/lua/rom/apis/help.lua
@@ -37,7 +37,7 @@ function topics()
     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 )
diff --git a/src/main/resources/assets/computercraft/lua/rom/apis/paintutils.lua b/src/main/resources/assets/computercraft/lua/rom/apis/paintutils.lua
index 0988945e0..5420b029d 100644
--- a/src/main/resources/assets/computercraft/lua/rom/apis/paintutils.lua
+++ b/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
diff --git a/src/main/resources/assets/computercraft/lua/rom/apis/peripheral.lua b/src/main/resources/assets/computercraft/lua/rom/apis/peripheral.lua
index 3f4fdc150..ecfccbb53 100644
--- a/src/main/resources/assets/computercraft/lua/rom/apis/peripheral.lua
+++ b/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
diff --git a/src/main/resources/assets/computercraft/lua/rom/apis/rednet.lua b/src/main/resources/assets/computercraft/lua/rom/apis/rednet.lua
index 5af3a4706..e38084ad5 100644
--- a/src/main/resources/assets/computercraft/lua/rom/apis/rednet.lua
+++ b/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
diff --git a/src/main/resources/assets/computercraft/lua/rom/apis/settings.lua b/src/main/resources/assets/computercraft/lua/rom/apis/settings.lua
index d60510937..9f9ba9822 100644
--- a/src/main/resources/assets/computercraft/lua/rom/apis/settings.lua
+++ b/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)
diff --git a/src/main/resources/assets/computercraft/lua/rom/apis/term.lua b/src/main/resources/assets/computercraft/lua/rom/apis/term.lua
index e9ad00408..98db90be7 100644
--- a/src/main/resources/assets/computercraft/lua/rom/apis/term.lua
+++ b/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 )
diff --git a/src/main/resources/assets/computercraft/lua/rom/apis/textutils.lua b/src/main/resources/assets/computercraft/lua/rom/apis/textutils.lua
index 447babb44..09130fbad 100644
--- a/src/main/resources/assets/computercraft/lua/rom/apis/textutils.lua
+++ b/src/main/resources/assets/computercraft/lua/rom/apis/textutils.lua
@@ -16,7 +16,7 @@ function slowWrite( sText, nRate )
         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" )
@@ -123,7 +123,7 @@ local function tabulateCommon( bPaged, ... )
     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 )
@@ -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
diff --git a/src/main/resources/assets/computercraft/lua/rom/apis/vector.lua b/src/main/resources/assets/computercraft/lua/rom/apis/vector.lua
index 2fd2fbdb6..7a6db14b7 100644
--- a/src/main/resources/assets/computercraft/lua/rom/apis/vector.lua
+++ b/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 )
diff --git a/src/main/resources/assets/computercraft/lua/rom/apis/window.lua b/src/main/resources/assets/computercraft/lua/rom/apis/window.lua
index 87ede5cbd..2f20220fc 100644
--- a/src/main/resources/assets/computercraft/lua/rom/apis/window.lua
+++ b/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
diff --git a/src/main/resources/assets/computercraft/lua/rom/programs/advanced/multishell.lua b/src/main/resources/assets/computercraft/lua/rom/programs/advanced/multishell.lua
index 51c1c1753..b07cccf3c 100644
--- a/src/main/resources/assets/computercraft/lua/rom/programs/advanced/multishell.lua
+++ b/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 )
@@ -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()
diff --git a/src/main/resources/assets/computercraft/lua/rom/programs/copy.lua b/src/main/resources/assets/computercraft/lua/rom/programs/copy.lua
index 70cde52a1..71ea68043 100644
--- a/src/main/resources/assets/computercraft/lua/rom/programs/copy.lua
+++ b/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
diff --git a/src/main/resources/assets/computercraft/lua/rom/programs/delete.lua b/src/main/resources/assets/computercraft/lua/rom/programs/delete.lua
index e2d296805..91f2e0c23 100644
--- a/src/main/resources/assets/computercraft/lua/rom/programs/delete.lua
+++ b/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: ", "")))
diff --git a/src/main/resources/assets/computercraft/lua/rom/programs/drive.lua b/src/main/resources/assets/computercraft/lua/rom/programs/drive.lua
index c1a38e6dd..807cf88b4 100644
--- a/src/main/resources/assets/computercraft/lua/rom/programs/drive.lua
+++ b/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
diff --git a/src/main/resources/assets/computercraft/lua/rom/programs/edit.lua b/src/main/resources/assets/computercraft/lua/rom/programs/edit.lua
index e481dd9cd..2d7d9357e 100644
--- a/src/main/resources/assets/computercraft/lua/rom/programs/edit.lua
+++ b/src/main/resources/assets/computercraft/lua/rom/programs/edit.lua
@@ -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
@@ -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
@@ -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
@@ -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
diff --git a/src/main/resources/assets/computercraft/lua/rom/programs/fun/advanced/paint.lua b/src/main/resources/assets/computercraft/lua/rom/programs/fun/advanced/paint.lua
index bd0bb12b4..5011458ca 100644
--- a/src/main/resources/assets/computercraft/lua/rom/programs/fun/advanced/paint.lua
+++ b/src/main/resources/assets/computercraft/lua/rom/programs/fun/advanced/paint.lua
@@ -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)
diff --git a/src/main/resources/assets/computercraft/lua/rom/programs/fun/advanced/redirection.lua b/src/main/resources/assets/computercraft/lua/rom/programs/fun/advanced/redirection.lua
index d58bb0a4a..232f6d863 100644
--- a/src/main/resources/assets/computercraft/lua/rom/programs/fun/advanced/redirection.lua
+++ b/src/main/resources/assets/computercraft/lua/rom/programs/fun/advanced/redirection.lua
@@ -66,8 +66,8 @@ local function printCentred( yc, 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()
@@ -177,7 +177,6 @@ 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
@@ -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")
diff --git a/src/main/resources/assets/computercraft/lua/rom/programs/fun/adventure.lua b/src/main/resources/assets/computercraft/lua/rom/programs/fun/adventure.lua
index 61f373e8e..eef035301 100644
--- a/src/main/resources/assets/computercraft/lua/rom/programs/fun/adventure.lua
+++ b/src/main/resources/assets/computercraft/lua/rom/programs/fun/adventure.lua
@@ -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." )
diff --git a/src/main/resources/assets/computercraft/lua/rom/programs/fun/dj.lua b/src/main/resources/assets/computercraft/lua/rom/programs/fun/dj.lua
index 4cc98a3ef..81775248b 100644
--- a/src/main/resources/assets/computercraft/lua/rom/programs/fun/dj.lua
+++ b/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
diff --git a/src/main/resources/assets/computercraft/lua/rom/programs/fun/worm.lua b/src/main/resources/assets/computercraft/lua/rom/programs/fun/worm.lua
index 33c7eed8f..58eb72fc0 100644
--- a/src/main/resources/assets/computercraft/lua/rom/programs/fun/worm.lua
+++ b/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
@@ -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
 
@@ -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 )
diff --git a/src/main/resources/assets/computercraft/lua/rom/programs/gps.lua b/src/main/resources/assets/computercraft/lua/rom/programs/gps.lua
index fc1ae7614..77621de75 100644
--- a/src/main/resources/assets/computercraft/lua/rom/programs/gps.lua
+++ b/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" )
diff --git a/src/main/resources/assets/computercraft/lua/rom/programs/help.lua b/src/main/resources/assets/computercraft/lua/rom/programs/help.lua
index 2925cf72d..c8653616a 100644
--- a/src/main/resources/assets/computercraft/lua/rom/programs/help.lua
+++ b/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()
diff --git a/src/main/resources/assets/computercraft/lua/rom/programs/list.lua b/src/main/resources/assets/computercraft/lua/rom/programs/list.lua
index 14ed40439..f493d8ae5 100644
--- a/src/main/resources/assets/computercraft/lua/rom/programs/list.lua
+++ b/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
diff --git a/src/main/resources/assets/computercraft/lua/rom/programs/lua.lua b/src/main/resources/assets/computercraft/lua/rom/programs/lua.lua
index e1a4cb0f2..50766b973 100644
--- a/src/main/resources/assets/computercraft/lua/rom/programs/lua.lua
+++ b/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 )
diff --git a/src/main/resources/assets/computercraft/lua/rom/programs/move.lua b/src/main/resources/assets/computercraft/lua/rom/programs/move.lua
index a794c90b9..5f12588e7 100644
--- a/src/main/resources/assets/computercraft/lua/rom/programs/move.lua
+++ b/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
diff --git a/src/main/resources/assets/computercraft/lua/rom/programs/pocket/falling.lua b/src/main/resources/assets/computercraft/lua/rom/programs/pocket/falling.lua
index 3680b6b66..afecfa67b 100644
--- a/src/main/resources/assets/computercraft/lua/rom/programs/pocket/falling.lua
+++ b/src/main/resources/assets/computercraft/lua/rom/programs/pocket/falling.lua
@@ -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
diff --git a/src/main/resources/assets/computercraft/lua/rom/programs/rednet/chat.lua b/src/main/resources/assets/computercraft/lua/rom/programs/rednet/chat.lua
index 329f15db8..2bf5404ee 100644
--- a/src/main/resources/assets/computercraft/lua/rom/programs/rednet/chat.lua
+++ b/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 ]
@@ -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 )
@@ -297,8 +297,7 @@ 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 )
@@ -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 )
diff --git a/src/main/resources/assets/computercraft/lua/rom/programs/rednet/repeat.lua b/src/main/resources/assets/computercraft/lua/rom/programs/rednet/repeat.lua
index c8fdc89b8..452ffb587 100644
--- a/src/main/resources/assets/computercraft/lua/rom/programs/rednet/repeat.lua
+++ b/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
diff --git a/src/main/resources/assets/computercraft/lua/rom/programs/redstone.lua b/src/main/resources/assets/computercraft/lua/rom/programs/redstone.lua
index 8a6d2db86..ff38a89ef 100644
--- a/src/main/resources/assets/computercraft/lua/rom/programs/redstone.lua
+++ b/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 )
diff --git a/src/main/resources/assets/computercraft/lua/rom/programs/set.lua b/src/main/resources/assets/computercraft/lua/rom/programs/set.lua
index 9acad56c2..94ef6b621 100644
--- a/src/main/resources/assets/computercraft/lua/rom/programs/set.lua
+++ b/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))
diff --git a/src/main/resources/assets/computercraft/lua/rom/programs/shell.lua b/src/main/resources/assets/computercraft/lua/rom/programs/shell.lua
index 3c15e04b3..13c4b90c0 100644
--- a/src/main/resources/assets/computercraft/lua/rom/programs/shell.lua
+++ b/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 = {}
@@ -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
diff --git a/src/main/resources/assets/computercraft/lua/rom/programs/turtle/dance.lua b/src/main/resources/assets/computercraft/lua/rom/programs/turtle/dance.lua
index 6f32a1df0..246992f78 100644
--- a/src/main/resources/assets/computercraft/lua/rom/programs/turtle/dance.lua
+++ b/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
diff --git a/src/main/resources/assets/computercraft/lua/rom/programs/turtle/excavate.lua b/src/main/resources/assets/computercraft/lua/rom/programs/turtle/excavate.lua
index 677e43678..5e7f32274 100644
--- a/src/main/resources/assets/computercraft/lua/rom/programs/turtle/excavate.lua
+++ b/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." )
diff --git a/src/main/resources/assets/computercraft/lua/rom/programs/turtle/refuel.lua b/src/main/resources/assets/computercraft/lua/rom/programs/turtle/refuel.lua
index d9f606f8c..fa69de01c 100644
--- a/src/main/resources/assets/computercraft/lua/rom/programs/turtle/refuel.lua
+++ b/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
 
diff --git a/src/main/resources/assets/computercraft/lua/rom/programs/turtle/tunnel.lua b/src/main/resources/assets/computercraft/lua/rom/programs/turtle/tunnel.lua
index 9345a6225..9bf4e2665 100644
--- a/src/main/resources/assets/computercraft/lua/rom/programs/turtle/tunnel.lua
+++ b/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()
diff --git a/src/main/resources/assets/computercraft/lua/rom/programs/turtle/turn.lua b/src/main/resources/assets/computercraft/lua/rom/programs/turtle/turn.lua
index 4ab6151ec..df90142d2 100644
--- a/src/main/resources/assets/computercraft/lua/rom/programs/turtle/turn.lua
+++ b/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
diff --git a/src/main/resources/assets/computercraft/lua/rom/startup.lua b/src/main/resources/assets/computercraft/lua/rom/startup.lua
index e6b396b39..af8ff4fbc 100644
--- a/src/main/resources/assets/computercraft/lua/rom/startup.lua
+++ b/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