server-nalc/mods/email/init.lua

email = {
	log = function(msg) end
}
local _loading = true

if minetest.global_exists("chatplus") then
	email.log = chatplus.log

	function chatplus.on_old_inbox(inbox)
		if _loading then
			return
		end

		email.inboxes = inbox
	end
end

function email.init()
	email.inboxes = {}
	email.load()
	_loading = false
	if minetest.global_exists("chatplus") and chatplus.old_inbox then
		chatplus.on_old_inbox(chatplus.old_inbox)
	end
end

function email.load()
	local file = io.open(minetest.get_worldpath() .. "/email.txt", "r")
	if file then
		local from_file = minetest.deserialize(file:read("*all"))
		file:close()
		if type(from_file) == "table" then
			if from_file.mod == "email" and tonumber(from_file.ver_min) <= 1 then
				email.inboxes = from_file.inboxes
			else
				error("[Email] Attempt to read incompatible email.txt file.")
			end
		end
	end
end

function email.save()
	local file = io.open(minetest.get_worldpath() .. "/email.txt", "w")
	if file then
		file:write(minetest.serialize({
			mod = "email", version = 1, ver_min = 1,
			inboxes = email.inboxes }))
		file:close()
	end
end
minetest.register_on_shutdown(email.save)

function email.get_inbox(name)
	return email.inboxes[name] or {}
end

function email.clear_inbox(name)
	email.inboxes[name] = nil
	email.save()
end

minetest.register_on_joinplayer(function(player)
	local inbox = email.get_inbox(player:get_player_name())
	if #inbox > 0 then
		minetest.after(10, function()
			minetest.chat_send_player(player:get_player_name(),
				"(" ..  #inbox .. ") You have mail! Type /inbox to recieve")
		end)
	end
end)

function email.get_formspec(name)
	local inbox = email.get_inbox(name)

	local fs = "size[12,8]"
	fs  = fs .. "vertlabel[0,0;email Mail]"

	function row(fs, c1, date, from, msg)
		date = minetest.formspec_escape(date)
		from = minetest.formspec_escape(from)
		msg = minetest.formspec_escape(msg)
		return fs .. ",#d0d0d0," .. table.concat({date, c1, from, msg}, ",")
	end

	fs  = fs .. "tablecolumns[color;text;color;text;text]"
	fs  = fs .. "tableoptions[highlight=#ffffff33]"
	fs  = fs .. "table[0.5,0;11.25,7;inbox;"
	fs  = fs .. "#ffffff,Date,,From,Message"
	if #inbox == 0 then
		fs = row(fs, "#d0d0d0", "", ":)", "Well done! Your inbox is empty!")
	else
		for i = 1, #inbox do
			local color = "#ffffff"
			if minetest.check_player_privs(inbox[i].from, {kick = true, ban = true}) then
				color = "#FFD700"
			end
			local msg = inbox[i].msg
			fs = row(fs, color, inbox[i].date, inbox[i].from, msg:sub(1, 44))
			while #msg > 45 do
				msg = msg:sub(45, #msg)
				fs = row(fs, color, "", "", msg:sub(1, 44))
			end
		end
	end
	fs = fs .. "]"

	fs = fs .. "button[0,7.25;2,1;clear;Delete All]"
	--fs = fs .. "button[0,7.25;2,1;clear;Mark as read]"
	fs = fs .. "button_exit[10.1,7.25;2,1;close;Close]"
	fs = fs .. "label[2,7.4;Exit then type /mail username message to reply]"

	return fs
end

function email.show_inbox(name, text_mode)
	if text_mode then
		local inbox = email.get_inbox(name)
		if #inbox == 0 then
			return true, "Your inbox is empty!"
		else
			minetest.chat_send_player(name, #inbox .. " items in your inbox:")
			for i = 1, #inbox do
				local item = inbox[i]
				minetest.chat_send_player(name, i .. ") " ..item.date ..
					" <" .. item.from .. "> " .. item.msg)
			end
			return true, "End of mail (" .. #inbox .. " items)"
		end
	else
		local fs = email.get_formspec(name)
		minetest.show_formspec(name, "email:inbox", fs)

		return true, "Opened inbox!"
	end

	return true
end

minetest.register_on_player_receive_fields(function(player,formname,fields)
	if fields.clear then
		local name = player:get_player_name()
		email.clear_inbox(name)
		minetest.chat_send_player(name, "Inbox cleared!")
		email.show_inbox(name)
	end

	--[[if fields.mark_all_read then
		if player and player.inbox and #player.inbox > 0 then
			for i = 1, #player.inbox do
				player.inbox[i].read = true
			end
			minetest.chat_send_player(name, "Marked all as read!")
			email.show_inbox(name)
		end
	end]]--
end)

function email.send_mail(name, to, msg)
	minetest.log("Email - To: "..to..", From: "..name..", MSG: "..msg)
	email.log("Email - To: "..to..", From: "..name..", MSG: "..msg)
	if true then
		local mail = {
			date = os.date("%Y-%m-%d %H:%M:%S"),
			from = name,
			msg = msg}

		if email.inboxes[to] then
			table.insert(email.inboxes[to], mail)
		else
			email.inboxes[to] = { mail }
		end

		email.save()

		minetest.chat_send_player(to, name .. " sent you mail! Type /inbox to see it.")

		return true, "Message sent to " .. to
	else
		return false, "Player '" .. to .. "' does not exist"
	end
end

minetest.register_chatcommand("inbox", {
	params = "[/clear/text]",
	description = "Inbox: Blank to see inbox. Use 'clear' to empty inbox, 'text' for text only.",
	func = function(name, param)
		if param == "clear" then
			email.clear_inbox(name)

			return true, "Inbox cleared"
		elseif param == "text" or param == "txt" or param == "t" then
			return email.show_inbox(name, true)
		else
			return email.show_inbox(name, false)
		end
	end
})

minetest.register_chatcommand("mail", {
	params = "name msg",
	description = "mail: add a message to a player's inbox",
	func = function(name, param)
		local to, msg = string.match(param, "^([%a%d_-]+) (.+)")
		if to and msg then
			return email.send_mail(name, to, msg)
		else
			return false, "Usage: mail <playername> <some message>"
		end

	end
})

dofile(minetest.get_modpath("email") .. "/hud.lua")

email.init()