plugins/timer: add sample plugin for game time [Carl]

plugins/timer/init.lua

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+-- license:BSD-3-Clause
+-- copyright-holders:Carl
+require('lfs')
+local exports = {}
+exports.name = "timer"
+exports.version = "0.0.1"
+exports.description = "Game play timer"
+exports.license = "The BSD 3-Clause License"
+exports.author = { name = "Carl" }
+
+local dummy = exports
+
+function dummy.startplugin()
+	local timer_path = "timer"
+	local timer_started = false
+	local total_time = 0
+	local start_time = 0
+
+	local function get_filename()
+		local path
+		if emu.softname() ~= "" then
+			path = timer_path .. '/' .. emu.romname() .. "_" .. emu.softname() .. ".time"
+		else
+			path = timer_path .. '/' .. emu.romname() .. ".time"
+		end
+		return path
+	end
+
+	emu.register_start(function()
+		local file
+		if timer_started then
+			total_time = total_time + (os.time() - start_time)
+			os.remove(get_filename()) -- truncate file
+			file = io.open(get_filename(), "w")
+			if not file then
+				lfs.mkdir(timer_path)
+				file = io.open(get_filename(), "w")
+			end
+			if file then
+				file:write(total_time)
+				file:close()
+			end
+		end
+		timer_started = true
+		local file = io.open(get_filename(), "r")
+		if file then
+			total_time = file:read("n")
+			file:close()
+		end
+		start_time = os.time()
+	end)
+
+	local function sectohms(time)
+		local hrs = math.floor(time / 3600)
+		local min = math.floor((time % 3600) / 60)
+		local sec = math.floor(time % 60)
+		return string.format("%02d:%02d:%02d", hrs, min, sec)
+	end
+
+	local function menu_populate()
+		local time = os.time() - start_time
+		return {{ "Current time", "", 32 },
+			{ sectohms(time), "", 32 },
+			{ "Total time", "", 32 },
+			{ sectohms(total_time + time), "", 32 }}
+	end
+
+	local function menu_callback(index, event)
+		return true
+	end
+
+	emu.register_menu(menu_callback, menu_populate, "Timer")
+end
+
+return exports

plugins/timer/plugin.json

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+{
+  "plugin": {
+    "name": "timer",
+	"description": "Timer plugin",
+    "version": "0.0.1",
+    "author": "Carl",
+	"type": "plugin",
+	"start": "false"
+  }
+}