Add lib

kai/lib.lua

@@ -0,0 +1,76 @@
+-- Do not lose state when reset (chunkloading etc)
+state = (function ()
+    local path = ".state"
+    local state_table = {}
+    
+    if fs.exists(path) then
+        local f = fs.open(path, "r")
+        state_table = textutils.unserialize(f.readAll())
+        f.close()
+    end
+    
+    return setmetatable({}, {
+        __index = state_table,
+
+        __newindex = function(self, k, v)
+            rawset(state_table, k, v)
+            local f = fs.open(path, "w")
+            f.write(textutils.serialize(state_table))
+            f.close()
+        end,
+    })
+end)()
+
+--[[
+    orientation:
+    0 = South (+z)
+    1 = West  (-x)
+    2 = North (-z)
+    3 = East  (+x)
+]]
+
+function move(raw_move, position_update)
+    return function()
+        success, err = raw_move()
+        if not success then
+            return false, err
+        end
+        position_update()
+    end
+end
+
+return {
+    state = state,
+
+    fwd = move(turtle.forward, function()
+        if state.o == 1 or state.o == 3 then
+            state.x = state.x + ((state.o == 1) and -1 or 1)
+        else
+            state.z = state.z + ((state.o == 2) and -1 or 1)
+        end
+    end),
+
+    back = move(turtle.back, function()
+        if state.o == 1 or state.o == 3 then
+            state.x = state.x + ((state.o == 1 and 1 or -1))
+        else
+            state.z = state.z + ((state.o == 2) and 1 or -1)
+        end
+    end),
+
+    up = move(turtle.up, function()
+        state.y = state.y + 1
+    end),
+
+    down = move(turtle.down, function()
+        state.y = state.y - 1
+    end),
+
+    left = move(turtle.turnLeft, function()
+        state.o = (state.o - 1) % 4
+    end),
+
+    right = move(turtle.turnRight, function()
+        state.o = (state.o + 1) % 4
+    end),
+}