new release

2024-12-26 16:40:27 +00:00 · 2018-12-08 13:25:30 -05:00 · 2018-12-08 13:25:30 -05:00 · 3953ef08cc
commit 3953ef08cc
parent e6a98b34cb 00fea37f3f
35 changed files with 1356 additions and 369 deletions
--- a/sys/apis/config.lua
+++ b/sys/apis/config.lua
@ -15,8 +15,13 @@ function Config.load(fname, data)
 	if not fs.exists(filename) then
 		Util.writeTable(filename, data)
 	else
-		Util.merge(data, Util.readTable(filename) or { })
+		local contents = Util.readTable(filename) or
+			error('Configuration file is corrupt:' .. filename)
+
+		Util.merge(data, contents)
 	end
+
+	return data
 end

 function Config.loadWithCheck(fname, data)
@ -33,7 +38,7 @@ function Config.loadWithCheck(fname, data)
 		shell.run('edit ' .. filename)
 	end

-	Config.load(fname, data)
+	return Config.load(fname, data)
 end

 function Config.update(fname, data)
--- a/sys/apis/event.lua
+++ b/sys/apis/event.lua
@ -1,4 +1,5 @@
-local os = _G.os
+local os    = _G.os
+local table = _G.table

 local Event = {
 	uid       = 1,       -- unique id for handlers
@ -6,8 +7,29 @@ local Event = {
 	types     = { },     -- event handlers
 	timers    = { },     -- named timers
 	terminate = false,
+	free      = { },
 }

+-- Use a pool of coroutines for event handlers
+local function createCoroutine(h)
+	local co = table.remove(Event.free)
+	if not co then
+		co = coroutine.create(function(_, ...)
+			local args = { ... }
+			while true do
+				h.fn(table.unpack(args))
+				h.co = nil
+				table.insert(Event.free, co)
+				args = { coroutine.yield() }
+				h = table.remove(args, 1)
+				h.co = co
+			end
+		end)
+	end
+	h.primeCo = true -- TODO: fix...
+	return co
+end
+
 local Routine = { }

 function Routine:isDead()
@ -24,18 +46,20 @@ function Routine:terminate()
 end

 function Routine:resume(event, ...)
-	--if coroutine.status(self.co) == 'running' then
-		--return
-	--end
-
 	if not self.co then
 		error('Cannot resume a dead routine')
 	end

 	if not self.filter or self.filter == event or event == "terminate" then
-		local s, m = coroutine.resume(self.co, event, ...)
-
-		if coroutine.status(self.co) == 'dead' then
+		local s, m
+		if self.primeCo then
+			-- Only need self passed when using a coroutine from the pool
+			s, m = coroutine.resume(self.co, self, event, ...)
+			self.primeCo = nil
+		else
+			s, m = coroutine.resume(self.co, event, ...)
+		end
+		if self:isDead() then
 			self.co = nil
 			self.filter = nil
 			Event.routines[self.uid] = nil
@ -83,8 +107,14 @@ end
 function Event.off(h)
 	if h and h.event then
 		for _,event in pairs(h.event) do
+			local handler = Event.types[event][h.uid]
+			if handler then
+				handler:terminate()
+			end
 			Event.types[event][h.uid] = nil
 		end
+	elseif h and h.co then
+		h:terminate()
 	end
 end

@ -107,7 +137,12 @@ local function addTimer(interval, recurring, fn)
 end

 function Event.onInterval(interval, fn)
-	return addTimer(interval, true, fn)
+	return Event.addRoutine(function()
+		while true do
+			os.sleep(interval)
+			fn()
+		end
+	end)
 end

 function Event.onTimeout(timeout, fn)
@ -136,6 +171,18 @@ function Event.waitForEvent(event, timeout)
 	until e[1] == 'timer' and e[2] == timerId
 end

+-- Set a handler for the terminate event. Within the function, return
+-- true or false to indicate whether the event should be propagated to
+-- all sub-threads
+function Event.onTerminate(fn)
+	Event.termFn = fn
+end
+
+function Event.termFn()
+	Event.terminate = true
+	return true -- propagate
+end
+
 function Event.addRoutine(fn)
 	local r = setmetatable({
 		co  = coroutine.create(fn),
@ -171,7 +218,7 @@ local function processHandlers(event)
 		for _,h in pairs(handlers) do
 			if not h.co then
 				-- callbacks are single threaded (only 1 co per handler)
-				h.co = coroutine.create(h.fn)
+				h.co = createCoroutine(h)
 				Event.routines[h.uid] = h
 			end
 		end
@ -204,11 +251,16 @@ end
 function Event.pullEvent(eventType)
 	while true do
 		local e = { os.pullEventRaw() }
+		local propagate = true           -- don't like this...

-		Event.terminate = Event.terminate or e[1] == 'terminate'
+		if e[1] == 'terminate' then
+			propagate = Event.termFn()
+		end

-		processHandlers(e[1])
-		processRoutines(table.unpack(e))
+		if propagate then
+			processHandlers(e[1])
+			processRoutines(table.unpack(e))
+		end

 		if Event.terminate then
 			return { 'terminate' }
--- a/sys/apis/fs/netfs.lua
+++ b/sys/apis/fs/netfs.lua
@ -1,5 +1,5 @@
 local Socket       = require('socket')
-local synchronized = require('sync')
+local synchronized = require('sync').sync

 local fs = _G.fs

--- a/sys/apis/git.lua
+++ b/sys/apis/git.lua
@ -1,27 +1,51 @@
 local json = require('json')
 local Util = require('util')

+-- Limit queries to once per minecraft day
+-- TODO: will not work if time is stopped
+
 local TREE_URL = 'https://api.github.com/repos/%s/%s/git/trees/%s?recursive=1'
 local FILE_URL = 'https://raw.githubusercontent.com/%s/%s/%s/%s'
-
 local git = { }

-function git.list(repository)
+local fs = _G.fs
+local os = _G.os

+if not _G.GIT then
+	_G.GIT = { }
+end
+
+function git.list(repository)
 	local t = Util.split(repository, '(.-)/')

-	local user = t[1]
-	local repo = t[2]
-	local branch = t[3] or 'master'
+	local user = table.remove(t, 1)
+	local repo = table.remove(t, 1)
+	local branch = table.remove(t, 1) or 'master'
+	local path

-	local dataUrl = string.format(TREE_URL, user, repo, branch)
-	local contents = Util.download(dataUrl)
-
-	if not contents then
-		error('Invalid repository')
+	if not Util.empty(t) then
+		path = table.concat(t, '/') .. '/'
 	end

-	local data = json.decode(contents)
+	local cacheKey = table.concat({ user, repo, branch }, '-')
+	local fname = fs.combine('.git', cacheKey)
+
+	local function getContents()
+		if fs.exists(fname) then
+			local contents = Util.readTable(fname)
+			if contents and contents.data == os.day() then
+				return contents.data
+			end
+			fs.delete(fname)
+		end
+		local dataUrl = string.format(TREE_URL, user, repo, branch)
+		local contents = Util.download(dataUrl)
+		if contents then
+			return json.decode(contents)
+		end
+	end
+
+	local data = getContents() or error('Invalid repository')

 	if data.message and data.message:find("API rate limit exceeded") then
 		error("Out of API calls, try again later")
@ -31,15 +55,26 @@ function git.list(repository)
 		error("Invalid repository")
 	end

-	local list = { }
+	if not fs.exists(fname) then
+		Util.writeTable('.git/' .. cacheKey, { day = os.day(), data = data })
+	end

+	local list = { }
 	for _,v in pairs(data.tree) do
 		if v.type == "blob" then
 			v.path = v.path:gsub("%s","%%20")
-			list[v.path] = {
-				url = string.format(FILE_URL, user, repo, branch, v.path),
-				size = v.size,
-			}
+			if not path then
+				list[v.path] = {
+					url = string.format(FILE_URL, user, repo, branch, v.path),
+					size = v.size,
+				}
+			elseif Util.startsWith(v.path, path) then
+				local p = string.sub(v.path, #path)
+				list[p] = {
+					url = string.format(FILE_URL, user, repo, branch, path .. p),
+					size = v.size,
+				}
+			end
 		end
 	end

--- a/sys/apis/json.lua
+++ b/sys/apis/json.lua
@ -68,7 +68,6 @@ local function encodeCommon(val, pretty, tabLevel, tTracking)
 				str = str .. encodeCommon(v, pretty, tabLevel, tTracking)
 			end)
 		else
-debug(val)
 			arrEncoding(val, "{", "}", pairs, function(k,v)
 				assert(type(k) == "string", "JSON object keys must be strings", 2)
 				str = str .. encodeCommon(k, pretty, tabLevel, tTracking)
--- a/sys/apis/packages.lua
+++ b/sys/apis/packages.lua
@ -0,0 +1,60 @@
+local Util = require('util')
+
+local fs        = _G.fs
+local textutils = _G.textutils
+
+local PACKAGE_DIR = 'packages'
+
+local Packages = { }
+
+function Packages:installed()
+	self.cache = { }
+
+	if fs.exists(PACKAGE_DIR) then
+		for _, dir in pairs(fs.list(PACKAGE_DIR)) do
+			local path = fs.combine(fs.combine(PACKAGE_DIR, dir), '.package')
+			self.cache[dir] = Util.readTable(path)
+		end
+	end
+
+	return self.cache
+end
+
+function Packages:list()
+	if self.packageList then
+		return self.packageList
+	end
+	self.packageList = Util.readTable('usr/config/packages') or { }
+
+	return self.packageList
+end
+
+function Packages:isInstalled(package)
+	return self:installed()[package]
+end
+
+function Packages:getManifest(package)
+	local fname = 'packages/' .. package .. '/.package'
+	if fs.exists(fname) then
+		local c = Util.readTable(fname)
+		if c then
+			c.repository = c.repository:gsub('{{OPUS_BRANCH}}', _G.OPUS_BRANCH)
+			return c
+		end
+	end
+	local list = self:list()
+	local url = list and list[package]
+
+	if url then
+		local c = Util.httpGet(url)
+		if c then
+			c = textutils.unserialize(c)
+			if c then
+				c.repository = c.repository:gsub('{{OPUS_BRANCH}}', _G.OPUS_BRANCH)
+				return c
+			end
+		end
+	end
+end
+
+return Packages
--- a/sys/apis/peripheral.lua
+++ b/sys/apis/peripheral.lua
@ -28,9 +28,9 @@ function Peripheral.addDevice(deviceList, side)
 	end

 	if ptype == 'modem' then
-		if Peripheral.call(name, 'isWireless') then
-			ptype = 'wireless_modem'
-		else
+		if not Peripheral.call(name, 'isWireless') then
+--			ptype = 'wireless_modem'
+--		else
 			ptype = 'wired_modem'
 		end
 	end
@ -55,17 +55,21 @@ function Peripheral.addDevice(deviceList, side)
 	end

 	-- this can randomly fail
-	pcall(function() deviceList[name] = Peripheral.wrap(side) end)
+	if not deviceList[name] then
+		pcall(function()
+			deviceList[name] = Peripheral.wrap(side)
+		end)

-	if deviceList[name] then
-		Util.merge(deviceList[name], {
-			name = name,
-			type = ptype,
-			side = side,
-		})
-
-		return deviceList[name]
+		if deviceList[name] then
+			Util.merge(deviceList[name], {
+				name = name,
+				type = ptype,
+				side = side,
+			})
+		end
 	end
+
+	return deviceList[name]
 end

 function Peripheral.getBySide(side)
--- a/sys/apis/point.lua
+++ b/sys/apis/point.lua
@ -48,6 +48,13 @@ function Point.copy(pt)
 	return { x = pt.x, y = pt.y, z = pt.z }
 end

+function Point.round(pt)
+	pt.x = Util.round(pt.x)
+	pt.y = Util.round(pt.y)
+	pt.z = Util.round(pt.z)
+	return pt
+end
+
 function Point.same(pta, ptb)
 	return pta.x == ptb.x and
 				 pta.y == ptb.y and
@ -144,14 +151,21 @@ function Point.calculateMoves(pta, ptb, distance)
 		end
 	end

-	if ptb.heading then
-		if heading ~= ptb.heading then
-			moves = moves + Point.calculateTurns(heading, ptb.heading)
-			heading = ptb.heading
-		end
+	if not ptb.heading then
+		return moves, heading, moves
 	end

-	return moves, heading
+	-- calc turns as slightly less than moves
+	local weighted = moves
+	if heading ~= ptb.heading then
+		local turns = Point.calculateTurns(heading, ptb.heading)
+		moves = moves + turns
+		local wturns = { [0] = 0, [1] = .9, [2] = 1.9 }
+		weighted = weighted + wturns[turns]
+		heading = ptb.heading
+	end
+
+	return moves, heading, weighted
 end

 -- given a set of points, find the one taking the least moves
@ -164,7 +178,7 @@ function Point.closest(reference, pts)
 	for _,pt in pairs(pts) do
 		local distance = Point.turtleDistance(reference, pt)
 		if distance < lm then
-			local m = Point.calculateMoves(reference, pt, distance)
+			local _, _, m = Point.calculateMoves(reference, pt, distance)
 			if m < lm then
 				lpt = pt
 				lm = m
--- a/sys/apis/socket.lua
+++ b/sys/apis/socket.lua
@ -81,7 +81,8 @@ local function loopback(port, sport, msg)
 end

 local function newSocket(isLoopback)
-	for i = 16384, 32767 do
+	for _ = 16384, 32767 do
+		local i = math.random(16384, 32767)
 		if not device.wireless_modem.isOpen(i) then
 			local socket = {
 				shost = os.getComputerID(),
@ -128,6 +129,7 @@ function Socket.connect(host, port)
 		local e, id, sport, dport, msg = os.pullEvent()
 		if e == 'modem_message' and
 			 sport == socket.sport and
+			 type(msg) == 'table' and
 			 msg.dhost == socket.shost then

 			os.cancelTimer(timerId)
@ -171,7 +173,7 @@ local function trusted(msg, port)
 		local data = Crypto.decrypt(msg.t or '', pubKey)

 		--local sharedKey = modexp(pubKey, exchange.secretKey, public.primeMod)
-		return data.ts and tonumber(data.ts) and math.abs(os.time() - data.ts) < 1
+		return data.ts and tonumber(data.ts) and math.abs(os.time() - data.ts) < 24
 	end
 end

@ -184,6 +186,7 @@ function Socket.server(port)

 		if sport == port and
 			 msg and
+			 type(msg) == 'table' and
 			 msg.dhost == os.getComputerID() and
 			 msg.type == 'OPEN' then

--- a/sys/apis/sound.lua
+++ b/sys/apis/sound.lua
@ -0,0 +1,18 @@
+local peripheral  = _G.peripheral
+
+local Sound = {
+	_volume = 1,
+}
+
+function Sound.play(sound, vol)
+	local speaker = peripheral.find('speaker')
+	if speaker then
+		speaker.playSound('minecraft:' .. sound, vol or Sound._volume)
+	end
+end
+
+function Sound.setVolume(volume)
+	Sound._volume = math.max(0, math.min(volume, 1))
+end
+
+return Sound
--- a/sys/apis/sync.lua
+++ b/sys/apis/sync.lua
@ -1,26 +1,61 @@
-local syncLocks = { }
+local Sync = {
+  syncLocks = { }
+}

 local os = _G.os

-return function(obj, fn)
+function Sync.sync(obj, fn)
  local key = tostring(obj)
-  if syncLocks[key] then
+  if Sync.syncLocks[key] then
    local cos = tostring(coroutine.running())
-    table.insert(syncLocks[key], cos)
+    table.insert(Sync.syncLocks[key], cos)
    repeat
      local _, co = os.pullEvent('sync_lock')
    until co == cos
  else
-    syncLocks[key] = { }
+    Sync.syncLocks[key] = { }
  end
  local s, m = pcall(fn)
-  local co = table.remove(syncLocks[key], 1)
+  local co = table.remove(Sync.syncLocks[key], 1)
  if co then
    os.queueEvent('sync_lock', co)
  else
-    syncLocks[key] = nil
+    Sync.syncLocks[key] = nil
  end
  if not s then
    error(m)
  end
 end
+
+function Sync.lock(obj)
+  local key = tostring(obj)
+  if Sync.syncLocks[key] then
+    local cos = tostring(coroutine.running())
+    table.insert(Sync.syncLocks[key], cos)
+    repeat
+      local _, co = os.pullEvent('sync_lock')
+    until co == cos
+  else
+    Sync.syncLocks[key] = { }
+  end
+end
+
+function Sync.release(obj)
+  local key = tostring(obj)
+  if not Sync.syncLocks[key] then
+    error('Sync.release: Lock was not obtained', 2)
+  end
+  local co = table.remove(Sync.syncLocks[key], 1)
+  if co then
+    os.queueEvent('sync_lock', co)
+  else
+    Sync.syncLocks[key] = nil
+  end
+end
+
+function Sync.isLocked(obj)
+  local key = tostring(obj)
+  return not not Sync.syncLocks[key]
+end
+
+return Sync
--- a/sys/apis/ui.lua
+++ b/sys/apis/ui.lua
@ -3,6 +3,7 @@ local class      = require('class')
 local Event      = require('event')
 local Input      = require('input')
 local Peripheral = require('peripheral')
+local Sound      = require('sound')
 local Transition = require('ui.transition')
 local Util       = require('util')

@ -306,6 +307,9 @@ function Manager:setDefaultDevice(dev)
 end

 function Manager:addPage(name, page)
+	if not self.pages then
+		self.pages = { }
+	end
 	self.pages[name] = page
 end

@ -940,6 +944,7 @@ function UI.Device:postInit()
 end

 function UI.Device:resize()
+	self.device.setTextScale(self.textScale)
 	self.width, self.height = self.device.getSize()
 	self.lines = { }
 	self.canvas:resize(self.width, self.height)
@ -1055,6 +1060,17 @@ function UI.StringBuffer:insert(s, width)
 	end
 end

+function UI.StringBuffer:insertRight(s, width)
+	local len = #tostring(s or '')
+	if len > width then
+		s = _sub(s, 1, width)
+	end
+	if len < width then
+		table.insert(self.buffer, _rep(' ', width - len))
+	end
+	table.insert(self.buffer, s)
+end
+
 function UI.StringBuffer:get(sep)
 	return Util.widthify(table.concat(self.buffer, sep or ''), self.bufSize)
 end
@ -1205,7 +1221,7 @@ function UI.Page:focusNext()
 end

 function UI.Page:setFocus(child)
-	if not child.focus then
+	if not child or not child.focus then
 		return
 	end

@ -1218,7 +1234,8 @@ function UI.Page:setFocus(child)
 	self.focused = child
 	if not child.focused then
 		child.focused = true
-		self:emit({ type = 'focus_change', focused = child })
+		child:emit({ type = 'focus_change', focused = child })
+		--self:emit({ type = 'focus_change', focused = child })
 	end

 	child:focus()
@ -1250,6 +1267,7 @@ UI.Grid.defaults = {
 	backgroundSelectedColor = colors.gray,
 	headerBackgroundColor = colors.cyan,
 	headerTextColor = colors.white,
+	headerSortColor = colors.yellow,
 	unfocusedTextSelectedColor = colors.white,
 	unfocusedBackgroundSelectedColor = colors.gray,
 	focusIndicator = '>',
@ -1407,6 +1425,18 @@ function UI.Grid:getSelected()
 	end
 end

+function UI.Grid:setSelected(name, value)
+	if self.sorted then
+		for k,v in pairs(self.sorted) do
+			if self.values[v][name] == value then
+				self:setIndex(k)
+				return
+			end
+		end
+	end
+	self:setIndex(1)
+end
+
 function UI.Grid:focus()
 	self:drawRows()
 end
@ -1459,7 +1489,7 @@ function UI.Grid:update()
 end

 function UI.Grid:drawHeadings()
-	local sb = UI.StringBuffer(self.width)
+	local x = 1
 	for _,col in ipairs(self.columns) do
 		local ind = ' '
 		if col.key == self.sortColumn then
@ -1469,9 +1499,13 @@ function UI.Grid:drawHeadings()
 				ind = self.sortIndicator
 			end
 		end
-		sb:insert(ind .. col.heading, col.cw + 1)
+		self:write(x,
+			1,
+			Util.widthify(ind .. col.heading, col.cw + 1),
+			self.headerBackgroundColor,
+			col.key == self.sortColumn and self.headerSortColor or self.headerTextColor)
+		x = x + col.cw + 1
 	end
-	self:write(1, 1, sb:get(), self.headerBackgroundColor, self.headerTextColor)
 end

 function UI.Grid:sortCompare(a, b)
@ -1508,7 +1542,11 @@ function UI.Grid:drawRows()
 		end

 		for _,col in pairs(self.columns) do
-			sb:insert(ind .. safeValue(row[col.key] or ''), col.cw + 1)
+			if col.justify == 'right' then
+				sb:insertRight(ind .. safeValue(row[col.key] or ''), col.cw + 1)
+			else
+				sb:insert(ind .. safeValue(row[col.key] or ''), col.cw + 1)
+			end
 			ind = ' '
 		end

@ -1603,13 +1641,12 @@ function UI.Grid:eventHandler(event)
 				local col = 2
 				for _,c in ipairs(self.columns) do
 					if event.x < col + c.cw then
-						if self.sortColumn == c.key then
-							self:setInverseSort(not self.inverseSort)
-						else
-							self.sortColumn = c.key
-							self:setInverseSort(false)
-						end
-						self:draw()
+						self:emit({
+							type = 'grid_sort',
+							sortColumn = c.key,
+							inverseSort = self.sortColumn == c.key and not self.inverseSort,
+							element = self,
+						})
 						break
 					end
 					col = col + c.cw + 1
@ -1632,6 +1669,10 @@ function UI.Grid:eventHandler(event)
 		end
 		return false

+	elseif event.type == 'grid_sort' then
+		self.sortColumn = event.sortColumn
+		self:setInverseSort(event.inverseSort)
+		self:draw()
 	elseif event.type == 'scroll_down' then
 		self:setIndex(self.index + 1)
 	elseif event.type == 'scroll_up' then
@ -1854,6 +1895,8 @@ function UI.TitleBar:draw()
 	sb:center(string.format(' %s ', self.title))
 	if self.previousPage or self.event then
 		sb:insert(-1, self.closeInd)
+	else
+		sb:insert(-2, self.frameChar)
 	end
 	self:write(1, 1, sb:get())
 end
@ -2286,56 +2329,52 @@ function UI.Wizard:add(pages)
 	end
 end

-function UI.Wizard:enable()
+function UI.Wizard:getPage(index)
+	return Util.find(self.pages, 'index', index)
+end
+
+function UI.Wizard:enable(...)
 	self.enabled = true
-	for _,child in ipairs(self.children) do
-		if not child.index then
-			child:enable()
-		elseif child.index == 1 then
-			child:enable()
+	self.index = 1
+	local initial = self:getPage(1)
+	for _,child in pairs(self.children) do
+		if child == initial or not child.index then
+			child:enable(...)
 		else
 			child:disable()
 		end
 	end
-	self:emit({ type = 'enable_view', next = Util.find(self.pages, 'index', 1) })
+	self:emit({ type = 'enable_view', next = initial })
 end

-function UI.Wizard:nextView()
-	local currentView = Util.find(self.pages, 'enabled', true)
-	local nextView = Util.find(self.pages, 'index', currentView.index + 1)
-
-	if nextView then
-		self:emit({ type = 'enable_view', view = nextView })
-		self:addTransition('slideLeft')
-		currentView:disable()
-		nextView:enable()
-	end
-end
-
-function UI.Wizard:prevView()
-	local currentView = Util.find(self.pages, 'enabled', true)
-	local nextView = Util.find(self.pages, 'index', currentView.index - 1)
-
-	if nextView then
-		self:emit({ type = 'enable_view', view = nextView })
-		self:addTransition('slideRight')
-		currentView:disable()
-		nextView:enable()
-	end
+function UI.Wizard:isViewValid()
+	local currentView = self:getPage(self.index)
+	return not currentView.validate and true or currentView:validate()
 end

 function UI.Wizard:eventHandler(event)
 	if event.type == 'nextView' then
-		local currentView = Util.find(self.pages, 'enabled', true)
-		local nextView = Util.find(self.pages, 'index', currentView.index + 1)
-		currentView:emit({ type = 'enable_view', next = nextView, current = currentView })
+		local currentView = self:getPage(self.index)
+		if self:isViewValid() then
+			self.index = self.index + 1
+			local nextView = self:getPage(self.index)
+			currentView:emit({ type = 'enable_view', next = nextView, current = currentView })
+		end

 	elseif event.type == 'previousView' then
-		local currentView = Util.find(self.pages, 'enabled', true)
-		local nextView = Util.find(self.pages, 'index', currentView.index - 1)
-		currentView:emit({ type = 'enable_view', prev = nextView, current = currentView })
+		local currentView = self:getPage(self.index)
+		local nextView = self:getPage(self.index - 1)
+		if nextView then
+			self.index = self.index - 1
+			currentView:emit({ type = 'enable_view', prev = nextView, current = currentView })
+		end
 		return true

+	elseif event.type == 'wizard_complete' then
+		if self:isViewValid() then
+			self:emit({ type = 'accept' })
+		end
+
 	elseif event.type == 'enable_view' then
 		if event.current then
 			if event.next then
@ -2347,18 +2386,20 @@ function UI.Wizard:eventHandler(event)
 		end

 		local current = event.next or event.prev
-		if Util.find(self.pages, 'index', current.index - 1) then
+		if not current then error('property "index" is required on wizard pages') end
+
+		if self:getPage(self.index - 1) then
 			self.previousButton:enable()
 		else
 			self.previousButton:disable()
 		end

-		if Util.find(self.pages, 'index', current.index + 1) then
+		if self:getPage(self.index + 1) then
 			self.nextButton.text = 'Next >'
 			self.nextButton.event = 'nextView'
 		else
 			self.nextButton.text = 'Accept'
-			self.nextButton.event = 'accept'
+			self.nextButton.event = 'wizard_complete'
 		end
 		-- a new current view
 		current:enable()
@ -2381,12 +2422,12 @@ function UI.SlideOut:enable()
 	self.enabled = false
 end

-function UI.SlideOut:show()
+function UI.SlideOut:show(...)
 	self:addTransition('expandUp')
 	self.canvas:setVisible(true)
 	self.enabled = true
 	for _,child in pairs(self.children) do
-		child:enable()
+		child:enable(...)
 	end
 	self:draw()
 	self:capture(self)
@ -2494,6 +2535,7 @@ end

 function UI.Notification:error(value, timeout)
 	self.backgroundColor = colors.red
+	Sound.play('entity.villager.no', .5)
 	self:display(value, timeout)
 end

@ -2544,9 +2586,10 @@ UI.Throttle = class(UI.Window)
 UI.Throttle.defaults = {
 	UIElement = 'Throttle',
 	backgroundColor = colors.gray,
-	height = 6,
+	bordercolor = colors.cyan,
+	height = 4,
 	width = 10,
-	timeout = .095,
+	timeout = .075,
 	ctr = 0,
 	image = {
 		'  //)    (O )~@ &~&-( ?Q        ',
@ -2562,6 +2605,7 @@ function UI.Throttle:setParent()
 end

 function UI.Throttle:enable()
+	self.c = os.clock()
 	self.enabled = false
 end

@ -2570,27 +2614,26 @@ function UI.Throttle:disable()
 		self.enabled = false
 		self.canvas:removeLayer()
 		self.canvas = nil
-		self.c = nil
+		self.ctr = 0
 	end
 end

 function UI.Throttle:update()
 	local cc = os.clock()
-	if not self.c then
-		self.c = cc
-	elseif cc > self.c + self.timeout then
+	if cc > self.c + self.timeout then
 		os.sleep(0)
 		self.c = os.clock()
 		self.enabled = true
 		if not self.canvas then
-			self.canvas = self:addLayer(self.backgroundColor, colors.cyan)
+			self.canvas = self:addLayer(self.backgroundColor, self.borderColor)
 			self.canvas:setVisible(true)
-			self:clear(colors.cyan)
+			self:clear(self.borderColor)
 		end
 		local image = self.image[self.ctr + 1]
 		local width = self.width - 2
 		for i = 0, #self.image do
-			self:write(2, i + 2, image:sub(width * i + 1, width * i + width), colors.black, colors.white)
+			self:write(2, i + 1, image:sub(width * i + 1, width * i + width),
+				self.backgroundColor, self.textColor)
 		end

 		self.ctr = (self.ctr + 1) % #self.image
@ -2913,6 +2956,9 @@ UI.Chooser.defaults = {
 	choices = { },
 	nochoice = 'Select',
 	backgroundFocusColor = colors.lightGray,
+	textInactiveColor = colors.gray,
+	leftIndicator = '<',
+	rightIndicator = '>',
 	height = 1,
 }
 function UI.Chooser:setParent()
@ -2933,14 +2979,15 @@ function UI.Chooser:draw()
 	if self.focused then
 		bg = self.backgroundFocusColor
 	end
+	local fg = self.inactive and self.textInactiveColor or self.textColor
 	local choice = Util.find(self.choices, 'value', self.value)
 	local value = self.nochoice
 	if choice then
 		value = choice.name
 	end
-	self:write(1, 1, '<', bg, colors.black)
-	self:write(2, 1, ' ' .. Util.widthify(value, self.width-4) .. ' ', bg)
-	self:write(self.width, 1, '>', bg, colors.black)
+	self:write(1, 1, self.leftIndicator, self.backgroundColor, colors.black)
+	self:write(2, 1, ' ' .. Util.widthify(tostring(value), self.width-4) .. ' ', bg, fg)
+	self:write(self.width, 1, self.rightIndicator, self.backgroundColor, colors.black)
 end

 function UI.Chooser:focus()
@ -2951,22 +2998,26 @@ function UI.Chooser:eventHandler(event)
 	if event.type == 'key' then
 		if event.key == 'right' or event.key == 'space' then
 			local _,k = Util.find(self.choices, 'value', self.value)
+			local choice
 			if k and k < #self.choices then
-				self.value = self.choices[k+1].value
+				choice = self.choices[k+1]
 			else
-				self.value = self.choices[1].value
+				choice = self.choices[1]
 			end
-			self:emit({ type = 'choice_change', value = self.value })
+			self.value = choice.value
+			self:emit({ type = 'choice_change', value = self.value, element = self, choice = choice })
 			self:draw()
 			return true
 		elseif event.key == 'left' then
 			local _,k = Util.find(self.choices, 'value', self.value)
+			local choice
 			if k and k > 1 then
-				self.value = self.choices[k-1].value
+				choice = self.choices[k-1]
 			else
-				self.value = self.choices[#self.choices].value
+				choice = self.choices[#self.choices]
 			end
-			self:emit({ type = 'choice_change', value = self.value })
+			self.value = choice.value
+			self:emit({ type = 'choice_change', value = self.value, element = self, choice = choice })
 			self:draw()
 			return true
 		end
@ -2981,6 +3032,57 @@ function UI.Chooser:eventHandler(event)
 	end
 end

+--[[-- Chooser --]]--
+UI.Checkbox = class(UI.Window)
+UI.Checkbox.defaults = {
+	UIElement = 'Checkbox',
+	nochoice = 'Select',
+	checkedIndicator = 'X',
+	leftMarker = '[',
+	rightMarker = ']',
+	value = false,
+	textColor = colors.white,
+	backgroundColor = colors.black,
+	backgroundFocusColor = colors.lightGray,
+	height = 1,
+	width = 3,
+	accelerators = {
+		space = 'checkbox_toggle',
+		mouse_click = 'checkbox_toggle',
+	}
+}
+function UI.Checkbox:draw()
+	local bg = self.backgroundColor
+	if self.focused then
+		bg = self.backgroundFocusColor
+	end
+	if type(self.value) == 'string' then
+		self.value = nil  -- TODO: fix form
+	end
+	local text = string.format('[%s]', not self.value and ' ' or self.checkedIndicator)
+	self:write(1, 1, text, bg)
+	self:write(1, 1, self.leftMarker, self.backgroundColor, self.textColor)
+	self:write(2, 1, not self.value and ' ' or self.checkedIndicator, bg)
+	self:write(3, 1, self.rightMarker, self.backgroundColor, self.textColor)
+end
+
+function UI.Checkbox:focus()
+	self:draw()
+end
+
+function UI.Checkbox:reset()
+	self.value = false
+end
+
+function UI.Checkbox:eventHandler(event)
+	if event.type == 'checkbox_toggle' then
+		self.value = not self.value
+		self:emit({ type = 'checkbox_change', checked = self.value, element = self })
+		self:draw()
+		return true
+	end
+end
+
 --[[-- Text --]]--
 UI.Text = class(UI.Window)
 UI.Text.defaults = {
@ -3180,16 +3282,18 @@ function UI.Form:createForm()
 		end
 	end

-	table.insert(self.children, UI.Button {
-		y = -self.margin, x = -12 - self.margin,
-		text = 'Ok',
-		event = 'form_ok',
-	})
-	table.insert(self.children, UI.Button {
-		y = -self.margin, x = -7 - self.margin,
-		text = 'Cancel',
-		event = 'form_cancel',
-	})
+	if not self.manualControls then
+		table.insert(self.children, UI.Button {
+			y = -self.margin, x = -12 - self.margin,
+			text = 'Ok',
+			event = 'form_ok',
+		})
+		table.insert(self.children, UI.Button {
+			y = -self.margin, x = -7 - self.margin,
+			text = 'Cancel',
+			event = 'form_cancel',
+		})
+	end
 end

 function UI.Form:validateField(field)
@ -3198,25 +3302,47 @@ function UI.Form:validateField(field)
 			return false, 'Field is required'
 		end
 	end
+	if field.validate == 'numeric' then
+		if #tostring(field.value) > 0 then
+			if not tonumber(field.value) then
+				return false, 'Invalid number'
+			end
+		end
+	end
+	return true
+end
+
+function UI.Form:save()
+	for _,child in pairs(self.children) do
+		if child.formKey then
+			local s, m = self:validateField(child)
+			if not s then
+				self:setFocus(child)
+				self:emit({ type = 'form_invalid', message = m, field = child })
+				return false
+			end
+		end
+	end
+	for _,child in pairs(self.children) do
+		if child.formKey then
+			if (child.pruneEmpty and type(child.value) == 'string' and #child.value == 0) or
+				 (child.pruneEmpty and type(child.value) == 'boolean' and not child.value) then
+				self.values[child.formKey] = nil
+			elseif child.validate == 'numeric' then
+				self.values[child.formKey] = tonumber(child.value)
+			else
+				self.values[child.formKey] = child.value
+			end
+		end
+	end
+
 	return true
 end

 function UI.Form:eventHandler(event)
 	if event.type == 'form_ok' then
-		for _,child in pairs(self.children) do
-			if child.formKey  then
-				local s, m = self:validateField(child)
-				if not s then
-					self:setFocus(child)
-					self:emit({ type = 'form_invalid', message = m, field = child })
-					return false
-				end
-			end
-		end
-		for _,child in pairs(self.children) do
-			if child.formKey then
-				self.values[child.formKey] = child.value
-			end
+		if not self:save() then
+			return false
 		end
 		self:emit({ type = self.event, UIElement = self })
 	else
--- a/sys/apis/ui/canvas.lua
+++ b/sys/apis/ui/canvas.lua
@ -137,7 +137,7 @@ function Canvas:writeBlit(x, y, text, bg, fg)
 			if bg then
 				bg = _sub(bg, 2 - x)
 			end
-			if bg then
+			if fg then
 				fg = _sub(fg, 2 - x)
 			end
 			width = width + x - 1
@ -149,7 +149,7 @@ function Canvas:writeBlit(x, y, text, bg, fg)
 			if bg then
 				bg = _sub(bg, 1, self.width - x + 1)
 			end
-			if bg then
+			if fg then
 				fg = _sub(fg, 1, self.width - x + 1)
 			end
 			width = #text
--- a/sys/apis/util.lua
+++ b/sys/apis/util.lua
@ -172,6 +172,20 @@ function Util.deepMerge(obj, args)
 	end
 end

+-- remove table entries if passed function returns false
+function Util.prune(t, fn)
+	for _,k in pairs(Util.keys(t)) do
+		local v = t[k]
+		if type(v) == 'table' then
+			t[k] = Util.prune(v, fn)
+		end
+		if not fn(t[k]) then
+			t[k] = nil
+		end
+	end
+	return t
+end
+
 function Util.transpose(t)
 	local tt = { }
 	for k,v in pairs(t) do
@ -207,6 +221,7 @@ function Util.findAll(t, name, value)
 end

 function Util.shallowCopy(t)
+	if not t then error('Util.shallowCopy: invalid table', 2) end
 	local t2 = { }
 	for k,v in pairs(t) do
 		t2[k] = v
@ -342,6 +357,7 @@ function Util.readFile(fname)
 end

 function Util.writeFile(fname, data)
+	if not fname or not data then error('Util.writeFile: invalid parameters', 2) end
 	local file = io.open(fname, "w")
 	if not file then
 		error('Unable to open ' .. fname, 2)
@ -415,7 +431,7 @@ end
 function Util.download(url, filename)
 	local contents, msg = Util.httpGet(url)
 	if not contents then
-		error(string.format('Failed to download %s\n%s', url, msg))
+		error(string.format('Failed to download %s\n%s', url, msg), 2)
 	end

 	if filename then
@ -475,6 +491,7 @@ function Util.insertString(str, istr, pos)
 end

 function Util.split(str, pattern)
+	if not str then error('Util.split: Invalid parameters', 2) end
 	pattern = pattern or "(.-)\n"
 	local t = {}
 	local function helper(line) table.insert(t, line) return "" end
@ -491,7 +508,7 @@ function Util.matches(str, pattern)
 	return t
 end

-function Util.startsWidth(s, match)
+function Util.startsWith(s, match)
 	return string.sub(s, 1, #match) == match
 end

@ -653,7 +670,6 @@ function Util.getOptions(options, args, ignoreInvalid)
 		end
 	end
 	return true, Util.size(rawOptions)
-
 end

 return Util
--- a/sys/apps/Network.lua
+++ b/sys/apps/Network.lua
@ -1,5 +1,6 @@
 _G.requireInjector(_ENV)

+local Config = require('config')
 local Event  = require('event')
 local Socket = require('socket')
 local UI     = require('ui')
@ -20,6 +21,9 @@ local gridColumns = {
 	{ heading = 'Status', key = 'status'   },
 }

+local trusted = Util.readTable('usr/.known_hosts')
+local config = Config.load('network', { })
+
 if UI.term.width >= 30 then
 	table.insert(gridColumns, { heading = 'Fuel',   key = 'fuel', width = 5 })
 	table.insert(gridColumns, { heading = 'Uptime', key = 'uptime' })
@ -39,7 +43,16 @@ local page = UI.Page {
 				{ text = 'Establish', event = 'trust'   },
 				{ text = 'Remove',    event = 'untrust' },
 			} },
-			{ text = 'Help', event = 'help' },
+			{ text = 'Help', event = 'help', noCheck = true },
+			{
+				text = '\206',
+				x = -3,
+				dropdown = {
+					{ text = 'Show all', event = 'show_all', noCheck = true },
+					UI.MenuBar.spacer,
+					{ text = 'Show trusted', event = 'show_trusted', noCheck = true },
+				},
+			},
 		},
 	},
 	grid = UI.ScrollingGrid {
@ -143,6 +156,16 @@ This only needs to be done once.
 				q = 'cancel',
 			}
 		})
+
+	elseif event.type == 'show_all' then
+		config.showTrusted = false
+		self.grid:setValues(network)
+		Config.update('network', config)
+
+	elseif event.type == 'show_trusted' then
+		config.showTrusted = true
+		Config.update('network', config)
+
 	elseif event.type == 'quit' then
 		Event.exitPullEvents()
 	end
@ -155,7 +178,7 @@ function page.menuBar:getActive(menuItem)
 		local trustList = Util.readTable('usr/.known_hosts') or { }
 		return t and trustList[t.id]
 	end
-	return not not t
+	return menuItem.noCheck or not not t
 end

 function page.grid:getRowTextColor(row, selected)
@ -184,7 +207,17 @@ function page.grid:getDisplayValues(row)
 end

 Event.onInterval(1, function()
-	page.grid:update()
+	local t = { }
+	if config.showTrusted then
+		for k,v in pairs(network) do
+			if trusted[k] then
+				t[k] = v
+			end
+		end
+		page.grid:setValues(t)
+	else
+		page.grid:update()
+	end
 	page.grid:draw()
 	page:sync()
 end)
--- a/sys/apps/Overview.lua
+++ b/sys/apps/Overview.lua
@ -1,14 +1,15 @@
 _G.requireInjector(_ENV)

-local class  = require('class')
-local Config = require('config')
-local Event  = require('event')
-local FileUI = require('ui.fileui')
-local NFT    = require('nft')
-local SHA1   = require('sha1')
-local Tween  = require('ui.tween')
-local UI     = require('ui')
-local Util   = require('util')
+local class    = require('class')
+local Config   = require('config')
+local Event    = require('event')
+local FileUI   = require('ui.fileui')
+local NFT      = require('nft')
+local Packages = require('packages')
+local SHA1     = require('sha1')
+local Tween    = require('ui.tween')
+local UI       = require('ui')
+local Util     = require('util')

 local colors     = _G.colors
 local fs         = _G.fs
@ -32,25 +33,28 @@ local config = {
 Config.load('Overview', config)

 local applications = { }
+local extSupport = Util.getVersion() >= 1.76

 local function loadApplications()
-
 	local requirements = {
-		turtle = function() return turtle end,
-		advancedTurtle = function() return turtle and term.isColor() end,
-		advanced = function() return term.isColor() end,
-		pocket = function() return pocket end,
-		advancedPocket = function() return pocket and term.isColor() end,
-		advancedComputer = function() return not turtle and not pocket and term.isColor() end,
+		turtle = not not turtle,
+		advancedTurtle = turtle and term.isColor(),
+		advanced = term.isColor(),
+		pocket = not not pocket,
+		advancedPocket = pocket and term.isColor(),
+		advancedComputer = not turtle and not pocket and term.isColor(),
 	}

 	applications = Util.readTable('sys/etc/app.db')

-	if fs.exists('usr/etc/apps') then
-		local dbs = fs.list('usr/etc/apps')
-		for _, db in pairs(dbs) do
-			local apps = Util.readTable('usr/etc/apps/' .. db) or { }
-			Util.merge(applications, apps)
+	for dir in pairs(Packages:installed()) do
+		local path = fs.combine('packages/' .. dir, 'etc/apps')
+		if fs.exists(path) then
+			local dbs = fs.list(path)
+			for _, db in pairs(dbs) do
+				local apps = Util.readTable(fs.combine(path, db)) or { }
+				Util.merge(applications, apps)
+			end
 		end
 	end

@ -72,13 +76,10 @@ local function loadApplications()
 		end

 		if a.requires then
-			local fn = requirements[a.requires]
-			if fn and not fn() then
-				return false
-			end
+			return requirements[a.requires]
 		end

-		return true -- Util.startsWidth(a.run, 'http') or shell.resolveProgram(a.run)
+		return true -- Util.startsWith(a.run, 'http') or shell.resolveProgram(a.run)
 	end)
 end

@ -117,7 +118,7 @@ local function parseIcon(iconText)
 		icon = NFT.parse(iconText)
 		if icon then
 			if icon.height > 3 or icon.width > 8 then
-				error('Invalid size')
+				error('Must be an NFT image - 3 rows, 8 cols max')
 			end
 		end
 		return icon
@ -174,6 +175,10 @@ local page = UI.Page {
 	},
 }

+if extSupport then
+	page.container.backgroundColor = colors.black
+end
+
 UI.Icon = class(UI.Window)
 UI.Icon.defaults = {
 	UIElement = 'Icon',
@ -194,7 +199,6 @@ function UI.Icon:eventHandler(event)
 end

 function page.container:setCategory(categoryName, animate)
-
 	-- reset the viewport window
 	self.children = { }
 	self.offy = 0
@ -231,7 +235,10 @@ function page.container:setCategory(categoryName, animate)
 	for _,program in ipairs(filtered) do

 		local icon
-		if program.icon then
+		if extSupport and program.iconExt then
+			icon = parseIcon(program.iconExt)
+		end
+		if not icon and program.icon then
 			icon = parseIcon(program.icon)
 		end
 		if not icon then
@ -344,7 +351,6 @@ function page:resize()
 end

 function page:eventHandler(event)
-
 	if event.type == 'tab_select' then
 		self.container:setCategory(event.button.text, true)
 		self.container:draw()
@ -455,7 +461,10 @@ function editor:enable(app)
 		self.form:setValues(app)

 		local icon
-		if app.icon then
+		if extSupport and app.iconExt then
+			icon = parseIcon(app.iconExt)
+		end
+		if not icon and app.icon then
 			icon = parseIcon(app.icon)
 		end
 		self.form.image:setImage(icon)
@ -479,7 +488,6 @@ function editor:updateApplications(app)
 end

 function editor:eventHandler(event)
-
 	if event.type == 'form_cancel' or event.type == 'cancel' then
 		UI:setPreviousPage()

@ -501,13 +509,17 @@ function editor:eventHandler(event)
 				local s, m = pcall(function()
 					local iconLines = Util.readFile(fileName)
 					if not iconLines then
-						error('Unable to load file')
+						error('Must be an NFT image - 3 rows, 8 cols max')
 					end
 					local icon, m = parseIcon(iconLines)
 					if not icon then
 						error(m)
 					end
-					self.form.values.icon = iconLines
+					if extSupport then
+						self.form.values.iconExt = iconLines
+					else
+						self.form.values.icon = iconLines
+					end
 					self.form.image:setImage(icon)
 					self.form.image:draw()
 				end)
--- a/sys/apps/PackageManager.lua
+++ b/sys/apps/PackageManager.lua
@ -0,0 +1,158 @@
+_G.requireInjector(_ENV)
+
+local Ansi     = require('ansi')
+local Packages = require('packages')
+local UI       = require('ui')
+
+local colors   = _G.colors
+local shell    = _ENV.shell
+local term     = _G.term
+
+UI:configure('PackageManager', ...)
+
+local page = UI.Page {
+	grid = UI.ScrollingGrid {
+		y = 2, ey = 7, x = 2, ex = -6,
+		values = { },
+		columns = {
+			{ heading = 'Package', key = 'name' },
+		},
+		sortColumn = 'name',
+		autospace = true,
+		help = 'Select a package',
+	},
+	add = UI.Button {
+		x = -4, y = 4,
+		text = '+',
+		event = 'action',
+		help = 'Install or update',
+	},
+	remove = UI.Button {
+		x = -4, y = 6,
+		text = '-',
+		event = 'action',
+		operation = 'uninstall',
+		operationText = 'Remove',
+		help = 'Remove',
+	},
+	description = UI.TextArea {
+		x = 2, y = 9, ey = -2,
+		--backgroundColor = colors.white,
+	},
+	statusBar = UI.StatusBar { },
+	action = UI.SlideOut {
+		backgroundColor = colors.cyan,
+		titleBar = UI.TitleBar {
+			event = 'hide-action',
+		},
+		button = UI.Button {
+			ex = -4, y = 4, width = 7,
+			text = 'Begin', event = 'begin',
+		},
+		output = UI.Embedded {
+			y = 6, ey = -2, x = 2, ex = -2,
+		},
+		statusBar = UI.StatusBar {
+			backgroundColor = colors.cyan,
+		},
+	},
+}
+
+function page.grid:getRowTextColor(row, selected)
+	if row.installed then
+		return colors.yellow
+	end
+	return UI.Grid.getRowTextColor(self, row, selected)
+end
+
+function page.action:show()
+	UI.SlideOut.show(self)
+	self.output:draw()
+	self.output.win.redraw()
+end
+
+function page:run(operation, name)
+	local oterm = term.redirect(self.action.output.win)
+	self.action.output:clear()
+	local cmd = string.format('package %s %s', operation, name)
+	--for _ = 1, 3 do
+	--	print(cmd .. '\n')
+	--	os.sleep(1)
+	--end
+	term.setCursorPos(1, 1)
+	term.clear()
+	term.setTextColor(colors.yellow)
+	print(cmd .. '\n')
+	term.setTextColor(colors.white)
+	shell.run(cmd)
+	term.redirect(oterm)
+	self.action.output:draw()
+end
+
+function page:updateSelection(selected)
+	self.add.operation = selected.installed and 'update' or 'install'
+	self.add.operationText = selected.installed and 'Update' or 'Install'
+end
+
+function page:eventHandler(event)
+	if event.type == 'focus_change' then
+		self.statusBar:setStatus(event.focused.help)
+
+	elseif event.type == 'grid_focus_row' then
+		local manifest = event.selected.manifest
+
+		self.description.value = string.format('%s%s\n\n%s%s',
+			Ansi.yellow, manifest.title,
+			Ansi.white, manifest.description)
+		self.description:draw()
+		self:updateSelection(event.selected)
+
+	elseif event.type == 'action' then
+		local selected = self.grid:getSelected()
+		if selected then
+			self.operation = event.button.operation
+			self.action.button.text = event.button.operationText
+			self.action.titleBar.title = selected.manifest.title
+			self.action.button.text = 'Begin'
+			self.action.button.event = 'begin'
+			self.action:show()
+		end
+
+	elseif event.type == 'hide-action' then
+		self.action:hide()
+
+	elseif event.type == 'begin' then
+		local selected = self.grid:getSelected()
+		self:run(self.operation, selected.name)
+		selected.installed = Packages:isInstalled(selected.name)
+
+		self:updateSelection(selected)
+		self.action.button.text = 'Done'
+		self.action.button.event = 'hide-action'
+		self.action.button:draw()
+
+	elseif event.type == 'quit' then
+		UI:exitPullEvents()
+	end
+	UI.Page.eventHandler(self, event)
+end
+
+for k in pairs(Packages:list()) do
+	local manifest = Packages:getManifest(k)
+	if not manifest then
+		manifest = {
+			invalid = true,
+			description = 'Unable to download manifest',
+			title = '',
+		}
+	end
+	table.insert(page.grid.values, {
+		installed = not not Packages:isInstalled(k),
+		name = k,
+		manifest = manifest,
+	})
+end
+page.grid:update()
+
+UI:setPage(page)
+UI:pullEvents()
--- a/sys/apps/System.lua
+++ b/sys/apps/System.lua
@ -141,61 +141,63 @@ local systemPage = UI.Page {
 }

 if turtle then
-	local Home = require('turtle.home')
+	pcall(function()
+		local Home = require('turtle.home')
+-- TODO: dont rely on turtle.home
+		local values = { }
+		Config.load('gps', values.home and { values.home } or { })

-	local values = { }
-	Config.load('gps', values.home and { values.home } or { })
-
-	systemPage.tabs:add({
-		gpsTab = UI.Window {
-			tabTitle = 'GPS',
-			labelText = UI.Text {
-				x = 3, y = 2,
-				value = 'On restart, return to this location'
-			},
-			grid = UI.Grid {
-				x = 3, ex = -3, y = 4,
-				height = 2,
-				values = values,
-				inactive = true,
-				columns = {
-					{ heading = 'x', key = 'x' },
-					{ heading = 'y', key = 'y' },
-					{ heading = 'z', key = 'z' },
+		systemPage.tabs:add({
+			gpsTab = UI.Window {
+				tabTitle = 'GPS',
+				labelText = UI.Text {
+					x = 3, y = 2,
+					value = 'On restart, return to this location'
+				},
+				grid = UI.Grid {
+					x = 3, ex = -3, y = 4,
+					height = 2,
+					values = values,
+					inactive = true,
+					columns = {
+						{ heading = 'x', key = 'x' },
+						{ heading = 'y', key = 'y' },
+						{ heading = 'z', key = 'z' },
+					},
+				},
+				button1 = UI.Button {
+					x = 3, y = 7,
+					text = 'Set home',
+					event = 'gps_set',
+				},
+				button2 = UI.Button {
+					ex = -3, y = 7, width = 7,
+					text = 'Clear',
+					event = 'gps_clear',
 				},
 			},
-			button1 = UI.Button {
-				x = 3, y = 7,
-				text = 'Set home',
-				event = 'gps_set',
-			},
-			button2 = UI.Button {
-				ex = -3, y = 7, width = 7,
-				text = 'Clear',
-				event = 'gps_clear',
-			},
-		},
-	})
-	function systemPage.tabs.gpsTab:eventHandler(event)
-		if event.type == 'gps_set' then
-			systemPage.notification:info('Determining location', 10)
-			systemPage:sync()
-			if Home.set() then
-				Config.load('gps', values)
-				self.grid:setValues(values.home and { values.home } or { })
+		})
+		function systemPage.tabs.gpsTab:eventHandler(event)
+			if event.type == 'gps_set' then
+				systemPage.notification:info('Determining location', 10)
+				systemPage:sync()
+				if Home.set() then
+					Config.load('gps', values)
+					self.grid:setValues(values.home and { values.home } or { })
+					self.grid:draw()
+					systemPage.notification:success('Location set')
+				else
+					systemPage.notification:error('Unable to determine location')
+				end
+				return true
+			elseif event.type == 'gps_clear' then
+				fs.delete('usr/config/gps')
+				self.grid:setValues({ })
 				self.grid:draw()
-				systemPage.notification:success('Location set')
-			else
-				systemPage.notification:error('Unable to determine location')
+				return true
 			end
-			return true
-		elseif event.type == 'gps_clear' then
-			fs.delete('usr/config/gps')
-			self.grid:setValues({ })
-			self.grid:draw()
-			return true
 		end
-	end
+	end)
 end

 if settings then
--- a/sys/apps/package.lua
+++ b/sys/apps/package.lua
@ -0,0 +1,97 @@
+_G.requireInjector(_ENV)
+
+local Git      = require('git')
+local Packages = require('packages')
+local Util     = require('util')
+
+local fs       = _G.fs
+local term     = _G.term
+
+local args     = { ... }
+local action   = table.remove(args, 1)
+
+local function Syntax(msg)
+	_G.printError(msg)
+	print('\nSyntax: Package list | install [name] ... |  update [name] | uninstall [name]')
+	error(0)
+end
+
+local function progress(max)
+	-- modified from: https://pastebin.com/W5ZkVYSi (apemanzilla)
+	local _, y = term.getCursorPos()
+	local wide, _ = term.getSize()
+	term.setCursorPos(1, y)
+	term.write("[")
+	term.setCursorPos(wide - 6, y)
+	term.write("]")
+	local done = 0
+	return function()
+		done = done + 1
+		local value = done / max
+		term.setCursorPos(2,y)
+		term.write(("="):rep(math.floor(value * (wide - 8))))
+		local percent = math.floor(value * 100) .. "%"
+		term.setCursorPos(wide - percent:len(),y)
+		term.write(percent)
+	end
+end
+
+local function install(name)
+	local manifest = Packages:getManifest(name) or error('Invalid package')
+	local packageDir = fs.combine('packages', name)
+	local method = args[2] or 'local'
+	if method == 'remote' then
+		Util.writeTable(packageDir .. '/.install', {
+			mount = string.format('%s gitfs %s', packageDir, manifest.repository),
+		})
+		Util.writeTable(fs.combine(packageDir, '.package'), manifest)
+	else
+		local list = Git.list(manifest.repository)
+		local showProgress = progress(Util.size(list))
+		for path, entry in pairs(list) do
+			Util.download(entry.url, fs.combine(packageDir, path))
+			showProgress()
+		end
+	end
+	return
+end
+
+if action == 'list' then
+	for k in pairs(Packages:list()) do
+		Util.print('[%s] %s', Packages:isInstalled(k) and 'x' or ' ', k)
+	end
+	return
+end
+
+if action == 'install' then
+	local name = args[1] or Syntax('Invalid package')
+	if Packages:isInstalled(name) then
+		error('Package is already installed')
+	end
+	install(name)
+	print('installation complete')
+	return
+end
+
+if action == 'update' then
+	local name = args[1] or Syntax('Invalid package')
+	if not Packages:isInstalled(name) then
+		error('Package is not installed')
+	end
+	install(name)
+	print('update complete')
+	return
+end
+
+if action == 'uninstall' then
+	local name = args[1] or Syntax('Invalid package')
+	if not Packages:isInstalled(name) then
+		error('Package is not installed')
+	end
+	local packageDir = fs.combine('packages', name)
+	fs.delete(packageDir)
+	print('removed: ' .. packageDir)
+	return
+end
+
+Syntax('Invalid command')
--- a/sys/apps/shell
+++ b/sys/apps/shell
@ -365,7 +365,7 @@ local term      = _G.term
 local textutils = _G.textutils

 local terminal = term.current()
-Terminal.scrollable(terminal, 100)
+--Terminal.scrollable(terminal, 100)
 terminal.noAutoScroll = true

 local config = {
@ -568,10 +568,10 @@ local function shellRead(history)
 		local ie = Input:translate(event, p1, p2, p3)
 		if ie then
 			if ie.code == 'scroll_up' then
-				terminal.scrollUp()
+				--terminal.scrollUp()

 			elseif ie.code == 'scroll_down' then
-				terminal.scrollDown()
+				--terminal.scrollDown()

 			elseif ie.code == 'terminate' then
 				bExit = true
--- a/sys/apps/telnet.lua
+++ b/sys/apps/telnet.lua
@ -10,7 +10,7 @@ local os         = _G.os
 local read       = _G.read
 local term       = _G.term

-local options, args = Util.args({ ... })
+local args = { ... }

 local remoteId = tonumber(table.remove(args, 1) or '')
 if not remoteId then
@ -19,11 +19,11 @@ if not remoteId then
 end

 if not remoteId then
-	error('Syntax: telnet [-title TITLE] ID [PROGRAM]')
+	error('Syntax: telnet ID [PROGRAM] [ARGS]')
 end

-if options.title and multishell then
-	multishell.setTitle(multishell.getCurrent(), options.title)
+if multishell then
+	multishell.setTitle(multishell.getCurrent(), 'Telnet ' .. remoteId)
 end

 local socket, msg = Socket.connect(remoteId, 23)
--- a/sys/apps/vnc.lua
+++ b/sys/apps/vnc.lua
@ -1,12 +1,13 @@
 _G.requireInjector(_ENV)

-local Event    = require('event')
-local Socket   = require('socket')
-local Terminal = require('terminal')
-local Util     = require('util')
+local Event      = require('event')
+local Socket     = require('socket')
+local Terminal   = require('terminal')
+local Util       = require('util')

 local colors     = _G.colors
 local multishell = _ENV.multishell
+local os         = _G.os
 local term       = _G.term

 local remoteId
@ -26,75 +27,104 @@ if multishell then
 	multishell.setTitle(multishell.getCurrent(), 'VNC-' .. remoteId)
 end

-print('connecting...')
-local socket, msg = Socket.connect(remoteId, 5900)
+local function connect()
+	local socket, msg = Socket.connect(remoteId, 5900)

-if not socket then
-	error(msg)
-end
+	if not socket then
+		return false, msg
+	end

-local function writeTermInfo()
-	local w, h = term.getSize()
-	socket:write({
-		type = 'termInfo',
-		width = w,
-		height = h,
-		isColor = term.isColor(),
+	local function writeTermInfo()
+		local w, h = term.getSize()
+		socket:write({
+			type = 'termInfo',
+			width = w,
+			height = h,
+			isColor = term.isColor(),
+		})
+	end
+
+	writeTermInfo()
+
+	local ct = Util.shallowCopy(term.current())
+
+	if not ct.isColor() then
+		Terminal.toGrayscale(ct)
+	end
+
+	ct.clear()
+	ct.setCursorPos(1, 1)
+
+	Event.addRoutine(function()
+		while true do
+			local data = socket:read()
+			if not data then
+				break
+			end
+			for _,v in ipairs(data) do
+				ct[v.f](unpack(v.args))
+			end
+		end
+	end)
+
+	local filter = Util.transpose({
+		'char', 'paste', 'key', 'key_up',
+		'mouse_scroll', 'mouse_click', 'mouse_drag', 'mouse_up',
 	})
-end

-writeTermInfo()
-
-local ct = Util.shallowCopy(term.current())
-
-if not ct.isColor() then
-	Terminal.toGrayscale(ct)
-end
-
-Event.addRoutine(function()
 	while true do
-		local data = socket:read()
-		if not data then
+		local e = Event.pullEvent()
+		local event = e[1]
+
+		if not socket.connected then
 			break
 		end
-		for _,v in ipairs(data) do
-			ct[v.f](unpack(v.args))
+
+		if filter[event] then
+			socket:write({
+				type = 'shellRemote',
+				event = e,
+			})
+		elseif event == 'term_resize' then
+			writeTermInfo()
+		elseif event == 'terminate' then
+			socket:close()
+			ct.setBackgroundColor(colors.black)
+			ct.clear()
+			ct.setCursorPos(1, 1)
+			return true
 		end
 	end
-end)
-
-ct.clear()
-ct.setCursorPos(1, 1)
-
-local filter = Util.transpose({
-	'char', 'paste', 'key', 'key_up',
-	'mouse_scroll', 'mouse_click', 'mouse_drag', 'mouse_up',
-})
+	return false, "Connection Lost"
+end

 while true do
-	local e = Event.pullEvent()
-	local event = e[1]
+	term.clear()
+	term.setCursorPos(1, 1)

-	if not socket.connected then
-		print()
-		print('Connection lost')
-		print('Press enter to exit')
-		_G.read()
+	print('connecting...')
+	local s, m = connect()
+	if s then
 		break
 	end

-	if filter[event] then
-		socket:write({
-			type = 'shellRemote',
-			event = e,
-		})
-	elseif event == 'term_resize' then
-		writeTermInfo()
-	elseif event == 'terminate' then
-		socket:close()
-		ct.setBackgroundColor(colors.black)
-		ct.clear()
-		ct.setCursorPos(1, 1)
-		break
+	term.setBackgroundColor(colors.black)
+	term.setTextColor(colors.white)
+	term.clear()
+	term.setCursorPos(1, 1)
+	print(m)
+	print('\nPress any key to exit')
+	print('\nRetrying in ... ')
+	local x, y = term.getCursorPos()
+	for i = 5, 1, -1 do
+		local timerId = os.startTimer(1)
+		term.setCursorPos(x, y)
+		term.write(i)
+		repeat
+			local e, id = os.pullEvent()
+			if e == 'char' or e == 'key' then
+				return
+			end
+		until e == 'timer' and id == timerId
 	end
 end
--- a/sys/boot/opus.boot
+++ b/sys/boot/opus.boot
@ -11,7 +11,7 @@ for k,v in pairs(_ENV) do
 	sandboxEnv[k] = v
 end

-_G.debug = function() end
+_G._debug = function() end

 local function makeEnv()
 	local env = setmetatable({ }, { __index = _G })
--- a/sys/etc/app.db
+++ b/sys/etc/app.db
@ -1,10 +1,21 @@
 {
+	[ "0a999012ffb87b3edac99adbdfc498b12831a1e2" ] = {
+		title = "Packages",
+		category = "System",
+		run = "PackageManager.lua",
+		iconExt = "\030c\0317\151\131\131\131\0307\031c\148\
+\030c\0317\151\131\0310\143\0317\131\0307\031c\148\
+\0307\031c\138\030f\0317\151\131\131\131",
+	},
 	[ "53ebc572b4a44802ba114729f07bdaaf5409a9d7" ] = {
+		title = "Network",
 		category = "Apps",
 		icon = "\0304  \030    \
 \030f \0304 \0307 \030 \031  \031f)\
 \030f \0304 \0307 \030 \031f)",
-		title = "Network",
+		iconExt = "\030 \031f    \0305\031f\140\030f\0315\137\144\
+\030 \031f\030f\0314\131\131\0304\031f\148\030  \0305\155\150\149\
+\030 \031f\030f\0310\147\0300\031f\141\0304\149\0307\0318\149\030    ",
 		run = "Network.lua",
 	},
 	c7116629a6a855cb774d9c7c8ad822fd83c71fb5 = {
@ -13,6 +24,9 @@
 		icon = "\0304\031f \030f\0310o..\0304\031f \
 \0304\031f \030f\0310.o.\0304\031f \
 \0304\031f   - ",
+		iconExt = "\0307\031f\135\0300\0317\159\0307\0310\144\031f\139\
+\0300\0317\131\0307\0310\147\0300\0317\156\131\
+\130\143\143\129",
 		run = "rom/programs/reboot",
 	},
 	fb91e24fa52d8d2b32937bf04d843f730319a902 = {
@ -21,6 +35,9 @@
 		icon = "\0301\03171\03180\030 \031   \
 \0301\03181\030 \031    \
 \0301\03170\03180\03171\0307\031f>",
+		iconExt = "\031f\128\0313\152\131\131\132\031f\128\
+\0313\139\159\129\0303\031f\159\129\139\
+\031f\128\0313\136\0303\031f\143\143\030f\0313\134\031f\128",
 		run = "http://pastebin.com/raw/UzGHLbNC",
 	},
 	c47ae15370cfe1ed2781eedc1dc2547d12d9e972 = {
@ -29,6 +46,9 @@
 		icon = "  \031f?\031  \
 \031f?\031    \
 	 \031f?",
+		iconExt = "\0300\031f\129\030f\0310\131\0300\031f\148\030f\0310\148\
+\030 \031  \0300\031f\131\030f\0310\142\129\
+\030 \031  \0300\031f\131\030f\128",
 		run = "Help.lua",
 	},
 	b0832074630eb731d7fbe8074de48a90cd9bb220 = {
@ -37,46 +57,77 @@
 		icon = "\030f     \
 \030f\0310lua>\031  \
 \030f     ",
+		iconExt = "\0300\031f\151\030f\128\0300\159\159\159\030f\0310\144\0304\031f\159\030f\128\
+\0300\031f\149\030f\128\0300\149\149\151\145\030f\128\0314\153\
+\130\131\130\131\130\131\0314\130\031f\128",
 		run = "sys/apps/Lua.lua",
 	},
-	df485c871329671f46570634d63216761441bcd6 = {
-		title = "Devices",
-		category = "System",
-		icon = "\0304  \030   \
-\030f \0304 \0307 \030 \031  \031f_\
-\030f \0304 \0307 \030 \031f/",
-		run = "Devices.lua",
-	},
 	bc0792d8dc81e8aa30b987246a5ce97c40cd6833 = {
 		title = "System",
 		category = "System",
 		icon = "   \0307\031f| \
 \0307\031f---o\030 \031  \
 	 \0307\031f| ",
+		iconExt = "\0318\138\0308\031f\130\0318\128\031f\129\030f\0318\133\
+\0318\143\0308\128\0317\143\0318\128\030f\143\
+\0318\138\135\143\139\133",
 		run = "System.lua",
 	},
-	c5497bca58468ae64aed6c0fd921109217988db3 = {
-		title = "Events",
-		category = "System",
-		icon = "\0304\031f  \030    \0311e\
-\030f\031f \0304 \030  \0311ee\031f \
-\030f\031f \0304 \030 \0311e\031f   ",
-		run = "Events.lua",
-	},
 	[ "2a4d562b1d9a9c90bdede6fac8ce4f7402462b86" ] = {
 		title = "Tasks",
 		category = "System",
 		icon = "\030f\031f    \0315/\
 \030f\031f \0315/\\/ \
 \030f\0315/\031f    ",
+		iconExt = "\031f\128\128\0305\159\030f\128\0305\159\030f\0315\134\031f\128\
+\031f\128\0315\152\129\137\0305\031f\158\139\030f\0317 \
+\0315\134\031f\128\128\128\128\0305\154\030f\0317 ",
 		run = "Tasks.lua",
 	},
+	[ "a0365977708b7387ee9ce2c13e5820e6e11732cb" ] = {
+		title = "Pain",
+		category = "Apps",
+		icon = "\030 \031f\0307\031f\159\030    \159\030    \
+\030 \031f\0308\031f\135\0307\0318\144\140\030f\0317\159\143\031c\139\0302\135\030f\0312\157\
+\030 \031f\030f\0318\143\133\0312\136\0302\031f\159\159\143\131\030f\0312\132",
+		run = "http://pastebin.com/raw/wJQ7jav0",
+	},
+	[ "48d6857f6b2869d031f463b13aa34df47e18c548" ] = {
+		title = "Breakout",
+		category = "Games",
+		icon = "\0301\031f \0309 \030c \030b \030e \030c \0306 \
+\030 \031f       \
+\030 \031f   \0300   \0310 ",
+		iconExt = "\030 \031f\030f\0319\144\030d\031f\159\030b\159\030f\0311\144\031b\144\030c\031f\159\030f\0311\144\
+\030 \031f\030f\0311\130\031b\129\0319\130\031e\130\0310\144\031d\129\0316\129\
+\030 \031f\030f\0310\136\140\140\030     ",
+		run = "https://gist.github.com/LDDestroier/c7528d95bc0103545c2a/raw",
+	},
+	[ "53a5d150062b1e03206b9e15854b81060e3c7552" ] = {
+		title = "Minesweeper",
+		category = "Games",
+		icon = "\030f\031f \03131\0308\031f  \030f\031d2\
+\030f\031f \031d2\03131\0308\031f \030f\03131\
+\030f\03131\0308\031f  \030f\03131\031e3",
+		run = "https://pastebin.com/raw/nsKrHTbN",
+	},
+	[ "01c933b2a36ad8ed2d54089cb2903039046c1216" ] = {
+		title = "Enchat",
+		icon = "\030e\031f\151\030f\031e\156\0311\140\0314\140\0315\140\031d\140\031b\140\031a\132\
+\030f\0314\128\030e\031f\132\030f\031e\132\0318nchat\
+\030f\031e\138\141\0311\140\0314\140\0315\132\0317v\03183\031a\132",
+		category = "Apps",
+		run = "https://raw.githubusercontent.com/LDDestroier/enchat/master/enchat3.lua",
+	},
 	[ "6ce6c512ea433a7fc5c8841628e7696cd0ff7f2b" ] = {
 		title = "Files",
 		category = "Apps",
 		icon = "\0300\0317==\031  \0307 \
 \0300\0317====\
 \0300\0317====",
+		iconExt = "\030 \031f\0300\031f\136\140\132\0308\130\030f\0318\144\
+\030 \031f\030f\0310\157\0300\031f\147\030f\0310\142\143\149\
+\030 \031f\0300\031f\136\140\132\140\030f\0310\149",
 		run = "Files.lua",
 	},
 	[ "7fddb7d8d1d60b1eeefa9af01082e0811d4b484d" ] = {
@ -85,12 +136,18 @@
 		icon = "\0304\031f     \
 \0304\031f \030f\0310zz\031   \
 \0304\031f \030f    ",
+		iconExt = "\030e\031f\135\030f\031e\148\030e\128\031f\151\139\
+\030e\031e\128\030f\031f\128\031e\143\031f\128\030e\031e\128\
+\031e\139\030e\031f\130\131\129\030f\031e\135",
 		run = "/rom/programs/shutdown",
 	},
 	bdc1fd5d3c0f3dcfd55d010426e61bf9451e680d = {
 		title = "Shell",
 		category = "Apps",
-		icon = "\030f\0314\151\131\131\131\131\
+		icon = "\0304     \030  \
+\0304 \030f\0314> \0310_\031  \
+\0304 \030f    \030  ",
+		iconExt = "\030f\0314\151\131\131\131\131\
 \030f\0314\149\030f\0314> \0310_ \
 \030f\0314\149\030f    ",
 		run = "shell",
@ -127,6 +184,9 @@
 		icon = "\030d \030  \030e \030  \
 \030d \030    \
 \030d    ",
+		iconExt = "\030 \031f\0305\031f\151\030f\0315\135\131\0305\031f\146\
+\030 \031f\030f\0315\130\141\0305\031f\139\030f\0315\130\
+\030 \031f\0305\031f\146\143\030f\0315\158\031e\130",
 		run = "/rom/programs/fun/worm",
 	},
 	[ "9f46ca3ef617166776ef6014a58d4e66859caa62" ] = {
@ -135,6 +195,17 @@
 		icon = " \030f   \
 \030f  \0307  \
 \030f \0307  \0300 ",
+		iconExt = "\031f\128\0307\143\131\131\131\131\143\030f\128\
+\0307\031f\129\0317\128\0319\136\0309\031b\136\132\0307\0319\132\0317\128\031f\130\
+\0317\130\143\0307\128\128\128\128\030f\143\129",
 		run = "/rom/programs/fun/dj",
 	},
+	[ "76b849f460640bc789c433894382fb5acbac42a2" ] = {
+		title = "Tron",
+		category = "Games",
+	iconExt = "\030 \031f\030b\031f\143\030f\128\128\030b\143\143\143\030f\128\128\
+\030 \031f\0309\031b\140\030b\031f\151\030f\031b\131\0307\148\0317\128\030b\151\030f\031b\131\148\
+\030 \031f\030f\031b\131\031f\128\031b\131\0317\131\031f\128\0317\131\031b\131\031f\128",
+		run = "https://raw.githubusercontent.com/LDDestroier/CC/master/tron.lua",
+	},
 }
--- a/sys/etc/ext.theme
+++ b/sys/etc/ext.theme
@ -8,6 +8,15 @@
 	Button = {
 		--focusIndicator = '\183',
 	},
+	Checkbox = {
+		checkedIndicator = '\4',
+		leftMarker = '\124',
+		rightMarker = '\124',
+	},
+	Chooser = {
+		leftIndicator = '\17',
+		rightIndicator = '\16',
+	},
 	Grid = {
 		focusIndicator = '\183',
 		inverseSortIndicator = '\24',
--- a/sys/extensions/1.device.lua
+++ b/sys/extensions/1.device.lua
@ -33,12 +33,25 @@ local keyboard = _G.device.keyboard
 local mouse    = _G.device.mouse
 local os       = _G.os

+local drivers = { }
+
 kernel.hook('peripheral', function(_, eventData)
 	local side = eventData[1]
 	if side then
 		local dev = Peripheral.addDevice(device, side)
 		if dev then
-			os.queueEvent('device_attach', dev.name)
+			if drivers[dev.type] then
+				local e = drivers[dev.type](dev)
+				if type(e) == 'table' then
+					for _, v in pairs(e) do
+						os.queueEvent('device_attach', v.name)
+					end
+				elseif e then
+					os.queueEvent('device_attach', e.name)
+				end
+			end
+
+			os.queueEvent('device_attach', dev.name, dev)
 		end
 	end
 end)
@ -48,7 +61,12 @@ kernel.hook('peripheral_detach', function(_, eventData)
 	if side then
 		local dev = Util.find(device, 'side', side)
 		if dev then
-			os.queueEvent('device_detach', dev.name)
+			os.queueEvent('device_detach', dev.name, dev)
+			if dev._children then
+				for _,v in pairs(dev._children) do
+					os.queueEvent('peripheral_detach', v.name)
+				end
+			end
 			device[dev.name] = nil
 		end
 	end
@ -109,3 +127,60 @@ kernel.hook('monitor_touch', function(event, eventData)
 		return true -- stop propagation
 	end
 end)
+
+local function createDevice(name, devType, method, manipulator)
+	local dev = {
+		name = name,
+		side = name,
+		type = devType,
+	}
+	local methods = {
+		'drop', 'getDocs', 'getItem', 'getItemMeta', 'getTransferLocations',
+		'list', 'pullItems', 'pushItems', 'size', 'suck',
+	}
+	if manipulator[method] then
+		for _,k in pairs(methods) do
+			dev[k] = function(...)
+				return manipulator[method]()[k](...)
+			end
+		end
+		if not manipulator._children then
+			manipulator._children = { dev }
+		else
+			table.insert(manipulator._children, dev)
+		end
+		device[name] = dev
+	end
+end
+
+drivers['manipulator'] = function(dev)
+	if dev.getName then
+		local name
+		pcall(function()
+			name = dev.getName()
+		end)
+		if name then
+			if dev.getInventory then
+				createDevice(name .. ':inventory', 'inventory', 'getInventory', dev)
+			end
+			if dev.getEquipment then
+				createDevice(name .. ':equipment', 'equipment', 'getEquipment', dev)
+			end
+			if dev.getEnder then
+				createDevice(name .. ':enderChest', 'enderChest', 'getEnder', dev)
+			end
+
+			return dev._children
+		end
+	end
+end
+
+-- initialize drivers
+for _,v in pairs(device) do
+	if drivers[v.type] then
+		local s, m = pcall(drivers[v.type], v)
+		if not s and m then
+			_G.printError(m)
+		end
+	end
+end
--- a/sys/extensions/4.user.lua
+++ b/sys/extensions/4.user.lua
@ -11,10 +11,10 @@ end
 if not fs.exists('usr/autorun') then
 	fs.makeDir('usr/autorun')
 end
-if not fs.exists('usr/config/fstab') then
-	Util.writeFile('usr/config/fstab',
-		'usr gitfs kepler155c/opus-apps/' .. _G.OPUS_BRANCH)
-end
+--if not fs.exists('usr/config/fstab') then
+--	Util.writeFile('usr/config/fstab',
+--		'usr gitfs kepler155c/opus-apps/' .. _G.OPUS_BRANCH)
+--end

 if not fs.exists('usr/config/shell') then
 	Util.writeTable('usr/config/shell', {
@ -24,6 +24,17 @@ if not fs.exists('usr/config/shell') then
 	})
 end

+if not fs.exists('usr/config/packages') then
+	local packages = {
+		[ 'develop-1.8' ] = 'https://pastebin.com/raw/WhEiNGZE',
+		[ 'master-1.8' ] = 'https://pastebin.com/raw/pexZpAxt',
+	}
+
+	if packages[_G.OPUS_BRANCH] then
+		Util.download(packages[_G.OPUS_BRANCH], 'usr/config/packages')
+	end
+end
+
 local config = Util.readTable('usr/config/shell')
 if config.aliases then
 	for k in pairs(shell.aliases()) do
--- a/sys/extensions/5.network.lua
+++ b/sys/extensions/5.network.lua
@ -1,5 +1,10 @@
-local kernel = _G.kernel
-local os     = _G.os
+_G.requireInjector(_ENV)
+
+local Config = require('config')
+
+local device     = _G.device
+local kernel     = _G.kernel
+local os         = _G.os

 _G.network = { }

@ -11,15 +16,44 @@ local function startNetwork()
 	})
 end

+local function setModem(dev)
+	if not device.wireless_modem and dev.isWireless() then
+		local config = Config.load('os', { })
+		if not config.wirelessModem or dev.name == config.wirelessModem then
+			device.wireless_modem = dev
+			os.queueEvent('device_attach', 'wireless_modem')
+			return dev
+		end
+	end
+end
+
+-- create a psuedo-device named 'wireleess_modem'
 kernel.hook('device_attach', function(_, eventData)
-	if eventData[1] == 'wireless_modem' then
-		startNetwork()
+	local dev = device[eventData[1]]
+	if dev and dev.type == 'modem' then
+		if setModem(dev) then
+			startNetwork()
+		end
 	end
 end)

-if _G.device.wireless_modem then
+kernel.hook('device_detach', function(_, eventData)
+	if device.wireless_modem and eventData[1] == device.wireless_modem.name then
+		device['wireless_modem'] = nil
+		os.queueEvent('device_detach', 'wireless_modem')
+	end
+end)
+
+for _,dev in pairs(device) do
+	if dev.type == 'modem' then
+		if setModem(dev) then
+			break
+		end
+	end
+end
+
+if device.wireless_modem then
 	print('waiting for network...')
 	startNetwork()
 	os.pullEvent('network_up')
 end
-
--- a/sys/extensions/6.packages.lua
+++ b/sys/extensions/6.packages.lua
@ -0,0 +1,45 @@
+_G.requireInjector(_ENV)
+
+local Packages = require('packages')
+local Util     = require('util')
+
+local shell = _ENV.shell
+local fs = _G.fs
+
+local appPaths = Util.split(shell.path(), '(.-):')
+local luaPaths = Util.split(_G.LUA_PATH, '(.-):')
+
+local function addPath(t, e)
+	local function hasEntry()
+		for _,v in ipairs(t) do
+			if v == e then
+				return true
+			end
+		end
+	end
+	if not hasEntry() then
+		table.insert(t, 1, e)
+	end
+end
+
+-- dependency graph
+-- https://github.com/mpeterv/depgraph/blob/master/src/depgraph/init.lua
+
+for name in pairs(Packages:installed()) do
+	local packageDir = fs.combine('packages', name)
+	if fs.exists(fs.combine(packageDir, '.install')) then
+		local install = Util.readTable(fs.combine(packageDir, '.install'))
+		if install and install.mount then
+			fs.mount(table.unpack(Util.matches(install.mount)))
+		end
+	end
+
+	addPath(appPaths, packageDir)
+	local apiPath = fs.combine(fs.combine('packages', name), 'apis')
+	if fs.exists(apiPath) then
+		addPath(luaPaths, apiPath)
+	end
+end
+
+shell.setPath(table.concat(appPaths, ':'))
+_G.LUA_PATH = table.concat(luaPaths, ':')
--- a/sys/extensions/6.tl3.lua
+++ b/sys/extensions/6.tl3.lua
@ -7,7 +7,7 @@ _G.requireInjector(_ENV)
 local Pathing      = require('turtle.pathfind')
 local GPS          = require('gps')
 local Point        = require('point')
-local synchronized = require('sync')
+local synchronized = require('sync').sync
 local Util         = require('util')

 local os         = _G.os
@ -458,6 +458,7 @@ function turtle.back()
 end

 local function moveTowardsX(dx)
+	if not tonumber(dx) then error('moveTowardsX: Invalid arguments') end
 	local direction = dx - turtle.point.x
 	local move

@ -662,11 +663,11 @@ function turtle._goto(pt)
 	local dx, dy, dz, dh = pt.x, pt.y, pt.z, pt.heading
 	if not turtle.gotoSingleTurn(dx, dy, dz, dh) then
 		if not gotoMultiTurn(dx, dy, dz) then
-			return false
+			return false, 'Failed to reach location'
 		end
 	end
 	turtle.setHeading(dh)
-	return true
+	return pt
 end

 -- avoid lint errors
@ -738,6 +739,8 @@ function turtle.getSlot(indexOrId, slots)
 		}
 	end

+	-- inconsistent return value
+	-- null is returned if indexOrId is a string and no item is present
 	return {
 		qty = 0,  -- deprecate
 		count = 0,
@ -794,8 +797,12 @@ function turtle.getSummedInventory()
 end

 function turtle.has(item, count)
-	local slot = turtle.getSummedInventory()[item]
-	return slot and slot.count >= (count or 1)
+	if item:match('.*:%d') then
+		local slot = turtle.getSummedInventory()[item]
+		return slot and slot.count >= (count or 1)
+	end
+	local slot = turtle.getSlot(item)
+	return slot and slot.count > 0
 end

 function turtle.getFilledSlots(startSlot)
@ -966,6 +973,18 @@ function turtle.addWorldBlock(pt)
 	Pathing.addBlock(pt)
 end

+local movementStrategy = turtle.pathfind
+
+function turtle.setMovementStrategy(strategy)
+	if strategy == 'pathing' then
+		movementStrategy = turtle.pathfind
+	elseif strategy == 'goto' then
+		movementStrategy = turtle._goto
+	else
+		error('Invalid movement strategy')
+	end
+end
+
 function turtle.faceAgainst(pt, options) -- 4 sided
 	options = options or { }
 	options.dest = { }
@ -980,7 +999,7 @@ function turtle.faceAgainst(pt, options) -- 4 sided
 		})
 	end

-	return turtle.pathfind(Point.closest(turtle.point, options.dest), options)
+	return movementStrategy(Point.closest(turtle.point, options.dest), options)
 end

 -- move against this point
@ -1012,7 +1031,7 @@ function turtle.moveAgainst(pt, options) -- 6 sided
 		})
 	end

-	return turtle.pathfind(Point.closest(turtle.point, options.dest), options)
+	return movementStrategy(Point.closest(turtle.point, options.dest), options)
 end

 local actionsAt = {
@ -1097,7 +1116,7 @@ local function _actionAt(action, pt, ...)
 		direction = 'up'
 	end

-	if turtle.pathfind(apt) then
+	if movementStrategy(apt) then
 		return action[direction](...)
 	end
 end
--- a/sys/extensions/7.multishell.lua
+++ b/sys/extensions/7.multishell.lua
@ -1,7 +1,8 @@
 _G.requireInjector(_ENV)

-local Config = require('config')
-local Util   = require('util')
+local Config   = require('config')
+local Packages = require('packages')
+local Util     = require('util')

 local colors     = _G.colors
 local fs         = _G.fs
@ -32,6 +33,7 @@ local config = {
 		backgroundColor = colors.gray,
 		tabBarBackgroundColor = colors.gray,
 		focusBackgroundColor = colors.gray,
+		errorColor = colors.black,
 	},
 	color = {
 		textColor  = colors.lightGray,
@ -40,6 +42,7 @@ local config = {
 		backgroundColor = colors.gray,
 		tabBarBackgroundColor = colors.gray,
 		focusBackgroundColor = colors.gray,
+		errorColor = colors.red,
 	},
 }
 Config.load('multishell', config)
@ -129,6 +132,7 @@ function multishell.openTab(tab)
 			print('\nPress enter to close')
 			routine.isDead = true
 			routine.hidden = false
+			redrawMenu()
 			while true do
 				local e, code = os.pullEventRaw('key')
 				if e == 'terminate' or e == 'key' and code == keys.enter then
@ -252,8 +256,9 @@ kernel.hook('multishell_redraw', function()
 			tab.ex = tabX + tab.width
 			tabX = tabX + tab.width
 			if tab ~= currentTab then
+				local textColor = tab.isDead and _colors.errorColor or _colors.textColor
 				write(tab.sx, tab.title:sub(1, tab.width - 1),
-					_colors.backgroundColor, _colors.textColor)
+					_colors.backgroundColor, textColor)
 			end
 		end
 	end
@ -371,6 +376,10 @@ local function startup()
 	end

 	runDir('sys/autorun', shell.run)
+	for name in pairs(Packages:installed()) do
+		local packageDir = 'packages/' .. name .. '/autorun'
+		runDir(packageDir, shell.run)
+	end
 	runDir('usr/autorun', shell.run)

 	if not success then
--- a/sys/kernel.lua
+++ b/sys/kernel.lua
@ -28,12 +28,18 @@ local focusedRoutineEvents = Util.transpose {
 	'paste', 'terminate',
 }

-_G.debug = function(pattern, ...)
+_G._debug = function(pattern, ...)
 	local oldTerm = term.redirect(kernel.window)
 	Util.print(pattern, ...)
 	term.redirect(oldTerm)
 end

+if not _G.debug then -- don't clobber lua debugger
+	function _G.debug(...)
+		_G._debug(...)
+	end
+end
+
 -- any function that runs in a kernel hook does not run in
 -- a separate coroutine or have a window. an error in a hook
 -- function will crash the system.
--- a/sys/network/redserver.lua
+++ b/sys/network/redserver.lua
@ -83,11 +83,15 @@ Event.on('modem_message', function(_, _, dport, dhost, request)
 	if dport == 80 and dhost == computerId and type(request) == 'table' then
 		if request.method == 'GET' then
 			local query
+			if not request.path or type(request.path) ~= 'string' then
+				return
+			end
 			local path = request.path:gsub('%?(.*)', function(v)
 				query = parseQuery(v)
 				return ''
 			end)
 			if fs.isDir(path) then
+			-- TODO: more validation
 				modem.transmit(request.replyPort, request.replyAddress, {
 					statusCode = 200,
 					contentType = 'table/directory',
--- a/sys/network/snmp.lua
+++ b/sys/network/snmp.lua
@ -150,11 +150,13 @@ local function sendInfo()
 		end
 		if device.neuralInterface then
 			info.status = device.neuralInterface.status
-			if not info.status and device.neuralInterface.getMetaOwner then
-				info.status = 'health: ' ..
-					math.floor(device.neuralInterface.getMetaOwner().health /
-						device.neuralInterface.getMetaOwner().maxHealth * 100)
-			end
+			pcall(function()
+				if not info.status and device.neuralInterface.getMetaOwner then
+					info.status = 'health: ' ..
+						math.floor(device.neuralInterface.getMetaOwner().health /
+							device.neuralInterface.getMetaOwner().maxHealth * 100)
+				end
+			end)
 		end
 		device.wireless_modem.transmit(999, os.getComputerID(), info)
 	end
--- a/sys/network/transport.lua
+++ b/sys/network/transport.lua
@ -33,7 +33,7 @@ function transport.read(socket)
 end

 function transport.write(socket, data)
-	--debug('>> ' .. Util.tostring({ type = 'DATA', seq = socket.wseq }))
+	--_debug('>> ' .. Util.tostring({ type = 'DATA', seq = socket.wseq }))
 	socket.transmit(socket.dport, socket.dhost, data)

 	--local timerId = os.startTimer(3)
@ -45,7 +45,7 @@ function transport.write(socket, data)
 end

 function transport.ping(socket)
-	--debug('>> ' .. Util.tostring({ type = 'DATA', seq = socket.wseq }))
+	--_debug('>> ' .. Util.tostring({ type = 'DATA', seq = socket.wseq }))
 	if os.clock() - socket.activityTimer > 10 then
 		socket.activityTimer = os.clock()
 		socket.transmit(socket.dport, socket.dhost, {
@ -78,9 +78,12 @@ Event.on('modem_message', function(_, _, dport, dhost, msg, distance)
 		local socket = transport.sockets[dport]
 		if socket and socket.connected then

-			--if msg.type then debug('<< ' .. Util.tostring(msg)) end
+			--if msg.type then _debug('<< ' .. Util.tostring(msg)) end
+			if socket.co and coroutine.status(socket.co) == 'dead' then
+				_G._debug('socket coroutine dead')
+				socket:close()

-			if msg.type == 'DISC' then
+			elseif msg.type == 'DISC' then
 				-- received disconnect from other end
 				if socket.connected then
 					os.queueEvent('transport_' .. socket.uid)
@ -108,9 +111,9 @@ Event.on('modem_message', function(_, _, dport, dhost, msg, distance)
 				socket.activityTimer = os.clock()
 				if msg.seq ~= socket.rseq then
 					print('transport seq error - closing socket ' .. socket.sport)
-					debug(msg.data)
-					debug('current ' .. socket.rseq)
-					debug('expected ' .. msg.seq)
+					_debug(msg.data)
+					_debug('current ' .. socket.rseq)
+					_debug('expected ' .. msg.seq)
 --					socket:close()
 --					os.queueEvent('transport_' .. socket.uid)
 				else
@ -122,7 +125,7 @@ Event.on('modem_message', function(_, _, dport, dhost, msg, distance)
 						os.queueEvent('transport_' .. socket.uid)
 					end

-					--debug('>> ' .. Util.tostring({ type = 'ACK', seq = msg.seq }))
+					--_debug('>> ' .. Util.tostring({ type = 'ACK', seq = msg.seq }))
 					--socket.transmit(socket.dport, socket.dhost, {
 					--  type = 'ACK',
 					--  seq = msg.seq,