custom help files + redo System UI

sys/apis/config.lua

@@ -7,6 +7,7 @@ local Config = { }
 
 function Config.load(fname, data)
 	local filename = 'usr/config/' .. fname
+	data = data or { }
 
 	if not fs.exists('usr/config') then
 		fs.makeDir('usr/config')

sys/apis/turtle/home.lua

@@ -0,0 +1,42 @@
+local Config = require('config')
+local GPS    = require('gps')
+
+local turtle = _G.turtle
+
+local Home = { }
+
+function Home.go()
+  local config = { }
+  Config.load('gps', config)
+
+  if config.home then
+    if turtle.enableGPS() then
+      return turtle.pathfind(config.home)
+    end
+  end
+end
+
+function Home.set()
+  local config = { }
+  Config.load('gps', config)
+
+  local pt = GPS.getPoint()
+  if pt then
+    local originalHeading = turtle.point.heading
+    local heading = GPS.getHeading()
+    if heading then
+      local turns = (turtle.point.heading - originalHeading) % 4
+      pt.heading = (heading - turns) % 4
+      config.home = pt
+      Config.update('gps', config)
+
+      pt = GPS.getPoint()
+      pt.heading = heading
+      turtle.setPoint(pt, true)
+      turtle._goto(config.home)
+      return config.home
+    end
+  end
+end
+
+return Home

sys/apis/ui.lua

@@ -2250,6 +2250,13 @@ function UI.Tabs:add(children)
 	end
 end
 
+function UI.Tabs:selectTab(tab)
+	local menuItem = Util.find(self.tabBar:getFocusables(), 'tabUid', tab.uid)
+	if menuItem then
+		self.tabBar:emit({ type = 'tab_select', button = { uid = menuItem.uid } })
+	end
+end
+
 function UI.Tabs:enable()
 	self.enabled = true
 	self.tabBar:enable()
@@ -2999,6 +3006,7 @@ function UI.Chooser:eventHandler(event)
 		if event.key == 'right' or event.key == 'space' then
 			local _,k = Util.find(self.choices, 'value', self.value)
 			local choice
+			if not k then k = 1 end
 			if k and k < #self.choices then
 				choice = self.choices[k+1]
 			else
@@ -3021,7 +3029,7 @@ function UI.Chooser:eventHandler(event)
 			self:draw()
 			return true
 		end
-	elseif event.type == 'mouse_click' then
+	elseif event.type == 'mouse_click' or event.type == 'mouse_doubleclick' then
 		if event.x == 1 then
 			self:emit({ type = 'key', key = 'left' })
 			return true