Add news mod

mods/news/README.txt

@@ -0,0 +1,26 @@
+Minetest News
+-------------
+
+News that pops up in a formspec when a player joins the server.
+
+Create a text file called news.txt in the world folder.
+
+This text file can be updated any time and will always be current in game without a server reboot
+
+To add extra articles just create a text file for each article in the world folder in the format
+
+news_[article name].txt
+
+(i.e. news_crafting.txt would show an article for the command /news crafting)
+
+
+This version shows pops up if news.txt was changed since last log on.
+
+This modification is still bit rough as it needs cronjob which will be generating md5 hash of news.txt
+into file called news.txt.md5 . Without that file, script will crash.
+
+example cron line:
+
+* *  * * *   user   md5sum /path/to/news.txt > /path/to/news.txt.md5
+
+As I don't use windows, I will not provide information how to do so on windows.

mods/news/init.lua

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+local news = {}
+local news_player_stamps = {}
+
+local file = io.open(minetest.get_worldpath().."/player_stamps.txt", "r")
+if file then
+	news_player_stamps = minetest.deserialize(file:read("*all"))
+	file:close()
+	if not news_player_stamps then
+		news_player_stamps = {}
+	end
+end
+local function update_hash()
+	local file = io.open(minetest.get_worldpath().."/news.txt.md5", "r")
+	local news_h
+	if file then
+		local news_hfile_content = file:read("*all")
+		news_h = string.match(news_hfile_content, "(%w+)")
+		file:close()
+	end
+	return news_h
+end
+
+local news_hash = update_hash()
+
+local function compare_hashes(data, hash)
+	if data ~= nil then
+		if data == hash then
+			return false
+		else
+			return true
+		end
+	else
+		return nil
+	end
+end
+
+local function save_file()
+	local file = io.open(minetest.get_worldpath().."/player_stamps.txt", "w")
+	if file then
+		file:write(minetest.serialize(news_player_stamps))
+		file:close()
+	end
+end
+
+
+news.path = minetest.get_worldpath()
+
+function news.formspec(player,article)
+
+	if ( article == "" or article == nil ) then
+		article = "news.txt"
+	else
+		article = "news_"..article..".txt"
+	end
+
+	local newsfile = io.open(news.path.."/"..article,"r")
+
+	local formspec = "size[12,10]"
+
+	if newsfile ~= nil then
+		local newscontent = newsfile:read("*a")
+		formspec = formspec.."textarea[.25,.25;12,10;news;;"..newscontent.."]"
+	else
+		formspec = formspec.."label[.25,.25;Article does not exist]"
+	end
+	formspec = formspec.."button_exit[.25,9;2,1;exit;Close"
+	if ( newsfile ~= nil ) then
+		newsfile:close()
+	end
+	return formspec
+end
+
+function news.show_formspec(player)
+	local name = player:get_player_name()
+	minetest.show_formspec(name,"news",news.formspec(player))
+	minetest.log('action','Showing formspec to '..name)
+end
+
+
+minetest.register_chatcommand("news",{
+	params = "<article>",
+	description="Shows the server news",
+	func = function (name,params)
+		local player = minetest.get_player_by_name(name)
+		minetest.show_formspec(name,"news",news.formspec(player,params))
+	end,
+})
+
+minetest.register_on_joinplayer(function (player)
+	local name = player:get_player_name()
+	if news_player_stamps[name] == nil then
+		news_hash = update_hash()
+		news_player_stamps[name] = news_hash
+		minetest.after(5,news.show_formspec,player)
+		save_file()
+	else
+		news_hash = update_hash()
+		if compare_hashes(news_player_stamps[name], news_hash) ~= nil and compare_hashes(news_player_stamps[name], news_hash) then
+			news_player_stamps[name] = news_hash
+			minetest.after(5,news.show_formspec,player)
+			save_file()
+		end
+	end
+end)
+