Quitting.bit

package:application/vnd.bitty-archive;
data:text/json;count=144;path=info.json;
{
  "id": 0,
  "title": "Basics/03. Quitting",
  "description": "",
  "author": "Tony",
  "version": "1.0",
  "genre": "TUTORIAL",
  "url": ""
}
data:text/lua;count=938;path=main.lua;
--[[
Example for the Bitty Engine

Copyright (C) 2020 - 2024 Tony Wang, all rights reserved

Homepage: https://paladin-t.github.io/bitty/
]]

-- Get a persistence file path under the writable directory.
local tmpPath = Path.combine(Path.writableDirectory, 'basics_quitting.txt')
print('Using: ', tmpPath)

-- Reads and returns persisted data from file.
local function read()
	local result = 0
	local file = File.new()
	if file:open(tmpPath, Stream.Read) then
		result = file:readLine()
		result = tonumber(result)
		file:close()
	end

	return result
end

-- Writes data to file.
local function write(data)
	local file = File.new()
	if file:open(tmpPath, Stream.Write) then
		file:writeLine(tostring(data))
		file:close()
	end
end

local counter = 0

function setup()
	counter = read() -- Read on setup.
	print('Counter: ' .. counter)
end

function quit()
	counter = counter + 1
	write(counter) -- Write the new value to file on quit.
end