custom help files + redo System UI

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