Updated harvest and added movescript.

libs/move_script/README.md

@@ -0,0 +1,27 @@
+# movescript.lua
+A more convenient way to move a robot.
+
+## Pastebin
+[4c2AN8Jw](https://pastebin.com/4c2AN8Jw)
+
+## Module Requirements
+*None*
+
+## Instructions
+Simply run `pastebin get 4c2AN8Jw /home/lib/movescript` to install movescript to the local computer. Then you can begin writing movescripts to tell your robots how to move. For example:
+
+```
+local ms = require("movescript")
+
+local my_script = "FFURFFL"
+ms.execute(my_script)
+```
+
+The above code will make the robot move forward twice, then up once, then turn right, then move forward twice, and finally turn left.
+
+It is also possible to specify the amount of times to perform an action, by giving an integer value before the character for the movement you want. For example:
+
+```
+local my_long_script = "10D2R5B3U"
+ms.execute(my_long_script)
+```

libs/move_script/movescript.lua

@@ -0,0 +1,71 @@
+--[[
+Author: Andrew Lalis
+File: movescript.lua
+Version: 1.0
+Last Modified: 27-09-2018
+   
+Description:
+This library enables string representation of robot movement, for easier
+robotic control without repeating functions many times.
+--]]
+
+local r = require("robot")
+
+local movescript = {}
+
+local functionMap = {
+	["U"] = r.up,
+	["D"] = r.down,
+	["L"] = r.turnLeft,
+	["R"] = r.turnRight,
+	["F"] = r.forward,
+	["B"] = r.back
+}
+
+--[[
+Executes a single instruction once.
+c - character: One uppercase character to translate into movement.
+--]]
+local function executeChar(c)
+	local f = functionMap[c]
+	if (f == nil) then
+		return
+	end
+	local success = f()
+	while (not success) do
+		success = f()
+	end
+end
+
+--[[
+Executes a single instruction, such as '15D'
+instruction - string: An integer followed by an uppercase character.
+--]]
+local function executeInstruction(instruction)
+	local count = string.match(instruction, "%d+")
+	local char = string.match(instruction, "%u")
+	if (count == nil) then
+		count = 1
+	end
+	if (char == nil) then
+		return
+	end
+	for i=1,count do
+		executeChar(char)
+	end
+end
+
+--[[
+Executes a given script.
+script - string: The script to execute.
+--]]
+function movescript.execute(script)
+	while (script ~= nil and script ~= "") do
+		-- Matches the next instruction, possibly prefixed by an integer value.
+		local next_instruction = string.match(script, "%d*%u")
+		executeInstruction(next_instruction)
+		script = string.sub(script, string.len(next_instruction) + 1)
+	end
+end
+
+return movescript

scripts/harvest/harvest.lua

@@ -25,16 +25,7 @@ local LEFT = 1
 local RIGHT = 0
 
 -- List of crops which will be harvested.
-local crop_definitions = {
-	["harvestcraft:pamsoybeancrop"] = {
-		growth_limit = 0.42,
-		item_name = "harvestcraft:soybeanitem"
-	},
-	["harvestcraft:pamspiceleafcrop"] = {
-		growth_limit = 0.42,
-		item_name = "harvestcraft:spiceleafitem"
-	}
-}
+local crop_definitions = {}
 
 -- Repeats the given function until it returns true.
 local function doUntilSuccess(func)
@@ -170,6 +161,7 @@ return - int: The total number of crops harvested.
 local function harvestField(rows, columns, start_location)
 	goToStart(rows, columns)
 	-- Begin harvesting.
+	robot.select(1)
 	local harvests = 0
 	for i=1,rows do
 		harvests = harvests + harvestRow(columns)
@@ -206,16 +198,15 @@ return - table|nil: The table defined in config, or nil if the file does not
 exist or another error occurs.
 --]]
 local function loadConfig(filename)
-	if (fs.exists(filename) and not fs.isDirectory(filename)) then
 	-- Config file exists.
-		file = io.open(filename, "r")
-		local t = serial.unserialize(file:read())
-		file:close()
-		return t
-	else
+	local f = io.open(filename, "r")
+	if (f == nil) then
 		print("No config file " .. filename .. " exists. Please create it before continuing.")
 		return nil
 	end
+	local t = serial.unserialize(f:read())
+	f:close()
+	return t
 end
 
 --[[