LÖVE

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love.filesystem.write(filename,data

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love.filesystem.read(filename)

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easy_unlocked = true
medium_unlocked = false

function saveGame()
    local save = ""
    if(easy_unlocked) then
          save = save.."easy_unlocked = true;"
    end
    if(medium_unlocked) then
           save = save.."medium_unlocked = true;"
    end
    love.filesystem.write("save.txt",save)
end

function loadGame()
   toload = love.filesystem.load("save.txt")
   toload()
end

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function loadData()
	if love.filesystem.exists("savedata.txt") then
		local txt = love.filesystem.read("savedata.txt")
		local s = txt:split(";")
		for i = 1, #s do
			local s2 = s[i]:split(" = ")
			local value = s2[2]
			if value == "true" then
				value = true
			elseif value == "false" then
				value = false
			elseif value == "nil" then
				value = nil
			elseif tonumber(value) then
				value = tonumber(value)
			end
			_G[s2[1]] = value
		end
	end
end

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function string:split(delimiter)
	local result = {}
	local from	= 1
	local delim_from, delim_to = string.find( self, delimiter, from	 )
	while delim_from do
		table.insert( result, string.sub( self, from , delim_from-1 ) )
		from = delim_to + 1
		delim_from, delim_to = string.find( self, delimiter, from  )
	end
	table.insert( result, string.sub( self, from  ) )
	return result
end

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function saveData(t) --t is a table of variables names, like {"speed", "gravity", "mapname"}
	local s = ""
	for i = 1, #t do
		s = s .. t[i] .. " = "
		if type(_G[t[i]]) == "table" then
			s = s .. tabletostring(t[i])
		elseif type(_G[t[i]]) == "string" then
			s = s .. "\"" .. _G[t[i]] .. "\""
		else
			s = s .. tostring(_G[t[i]])
		end
		if i ~= #t then
			s = s .. "\r\n"
		end
	end
	love.filesystem.write("savedata.lua", s)
end

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function tabletostring(t)
	local t = t
	if type(t) == "string" then
		t = _G[t]
	end
	local ret = "{"
	for i, v in pairs(t) do
		if type(i) ~= "number" then
			ret = ret .. i .. " = "
		end
		if type(v) == "table" then
			ret = ret .. tabletostring(v)
		elseif type(v) == "string" then
			ret = ret .. "\"" .. v .. "\""
		else
			ret = ret .. tostring(v)
		end
		ret = ret .. ", "
	end
	return string.sub(ret, 1, -3) .. "}"
end

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require "savedata"

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local chunk = love.filesystem.load("savedata.lua")
chunk()