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computer/26/path.lua

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+pp = require("cc.pretty").pretty_print
+
+_G.facing = _G.facing or "south"
+_G.pos = _G.pos or vector.new(0,0,0)
+
+local up = vector.new(0,1,0)
+
+local rightOf = {
+	south = "west",
+	west = "north",
+	north = "east",
+	east = "south"
+}
+
+local leftOf = {
+	west = "south",
+	north = "west",
+	east = "north",
+	south = "east"
+}
+
+local vecOf = {
+	north = vector.new(0,0,-1),
+	south = vector.new(0,0,1),
+	east = vector.new(1,0,0),
+	west = vector.new(-1,0,0),
+}
+
+function goUp()
+	if turtle.up() then
+		_G.pos.y = _G.pos.y + 1
+		return true
+	end
+	printError("failed to go up")
+	printError(pos)
+	return false
+end
+
+function goDown()
+	if turtle.down() then
+		_G.pos.y = _G.pos.y - 1
+		return true
+	end
+	printError("failed to go down")
+	printError(pos)
+	return false
+end
+
+function goLeft()
+	turtle.turnLeft()
+	_G.facing = leftOf[_G.facing]
+end
+
+function goRight()
+	turtle.turnRight()
+	_G.facing = rightOf[_G.facing]
+end
+
+function goForward()
+	if turtle.forward() then
+		_G.pos = _G.pos + vecOf[_G.facing]
+		return true
+	end
+	-- printError("failed to go forward")
+	-- printError(pos)
+	return false
+end
+
+function goBack()
+	if turtle.back() then
+		_G.pos = _G.pos - vecOf[_G.facing]
+		return true
+	end
+	printError("failed to go backward")
+	printError(pos)
+	return false
+end
+
+function stepTo(target, dig)
+	local delta = target - _G.pos
+	-- print(delta)
+	if delta.y > 0 then
+		if dig then
+			repeat turtle.digUp() until goUp()
+		else
+			goUp()
+		end
+	elseif delta.y < 0 then
+		if dig then
+			turtle.digDown()
+		end
+		goDown()
+	elseif delta:dot(vecOf[_G.facing]) > 0 then
+		if dig then
+			repeat turtle.dig() until goForward()
+		else
+			goForward()
+		end
+	elseif delta:dot(vecOf[_G.facing]:cross(up)) > 0 then
+        goRight()
+    else
+        goLeft()
+	end
+end
+
+function goTo(target, face, dig)
+	while target ~= _G.pos do
+		stepTo(target, dig)
+	end
+	if face and face ~= _G.facing then
+		if rightOf[_G.facing] == face then
+			goRight()
+		elseif leftOf[_G.facing] == face then
+			goLeft()
+		else
+			goRight()
+			goRight()
+		end
+	end
+end
+
+function goHome()
+	goTo(vector.new(0,0,0), "south")
+end