[random_messages] Update

- For #397

mods/random_messages/README.txt

@@ -1,6 +1,13 @@
 RandomMessages mod by arsdragonfly.
 Put your messages in (world directory)/random_messages,1 message per line.
 Messages can be all kinds of hints, mod usage, etc.
+Add/Remove messages on the fly:
+/rmessages viewmessages
+to see all the messages.
+/rmessages addmessage blah blah blah
+to add the random message blah blah blah.
+/rmessages removemessage 2
+to remove the 2nd random message in /rmessages viewmessages .
 In minetest.conf, random_messages_interval decides how often a message is sent.
 Released under CC0.
 Special thanks to:

mods/random_messages/depends.txt

@@ -1 +0,0 @@
-default

mods/random_messages/init.lua

@@ -11,6 +11,21 @@ math.randomseed(os.time())
 random_messages = {}
 random_messages.messages = {} --This table contains all messages.
 
+function table.count( t )
+	local i = 0
+	for k in pairs( t ) do i = i + 1 end
+	return i
+end
+
+function table.random( t )
+	local rk = math.random( 1, table.count( t ) )
+	local i = 1
+	for k, v in pairs( t ) do
+		if ( i == rk ) then return v, k end
+		i = i + 1
+	end
+end
+
 function random_messages.initialize() --Set the interval in minetest.conf.
 	minetest.setting_set("random_messages_interval",120)
 	minetest.setting_save();
@@ -21,6 +36,15 @@ function random_messages.set_interval() --Read the interval from minetest.conf(s
 	MESSAGE_INTERVAL = tonumber(minetest.setting_get("random_messages_interval")) or random_messages.initialize()
 end
 
+function random_messages.check_params(name,func,params)
+	local stat,msg = func(params)
+	if not stat then
+		minetest.chat_send_player(name,msg)
+		return false
+	end
+	return true
+end
+
 function random_messages.read_messages()
 	local line_number = 1
 	local input = io.open(minetest.get_worldpath().."/random_messages","r")
@@ -39,22 +63,86 @@ function random_messages.read_messages()
 end
 
 function random_messages.display_message(message_number)
-	if random_messages.messages[message_number] then
-		minetest.chat_send_all(random_messages.messages[message_number])
+	local msg = random_messages.messages[message_number] or message_number
+	if msg then
+		minetest.chat_send_all(msg)
 	end
 end
 
 function random_messages.show_message()
-	random_messages.display_message(math.random(#random_messages.messages))
+	random_messages.display_message(table.random(random_messages.messages))
+end
+
+function random_messages.list_messages()
+	local str = ""
+	for k,v in pairs(random_messages.messages) do
+		str = str .. k .. " | " .. v .. "\n"
+	end
+	return str
+end
+
+function random_messages.remove_message(k)
+	table.remove(random_messages.messages,k)
+	random_messages.save_messages()
+end
+
+function random_messages.add_message(t)
+	table.insert(random_messages.messages,table.concat(t," ",2))
+	random_messages.save_messages()
+end
+
+function random_messages.save_messages()
+		local output = io.open(minetest.get_worldpath().."/random_messages","w")
+		for k,v in pairs(random_messages.messages) do
+			output:write(v .. "\n")
+		end
+		io.close(output)
 end
 
 --When server starts:
 random_messages.set_interval()
 random_messages.read_messages()
 
-local function tick()
-	random_messages.show_message()
-	minetest.after(MESSAGE_INTERVAL, tick)
-end
-minetest.after(MESSAGE_INTERVAL, tick)
+local TIMER = 0
+minetest.register_globalstep(function(dtime)
+	TIMER = TIMER + dtime;
+	if TIMER > MESSAGE_INTERVAL then
+		random_messages.show_message()
+		TIMER = 0
+	end
+end)
 
+local register_chatcommand_table = {
+	params = "viewmessages | removemessage <number> | addmessage <number>",
+	privs = {server = true},
+	description = "View and/or alter the server's random messages",
+	func = function(name,param)
+		local t = string.split(param, " ")
+		if t[1] == "viewmessages" then
+			minetest.chat_send_player(name,random_messages.list_messages())
+		elseif t[1] == "removemessage" then
+			if not random_messages.check_params(
+			name,
+			function (params)
+				if not tonumber(params[2]) or
+				random_messages.messages[tonumber(params[2])] == nil then
+					return false,"ERROR: No such message."
+				end
+				return true
+			end,
+			t) then return end
+			random_messages.remove_message(t[2])
+		elseif t[1] == "addmessage" then
+			if not t[2] then
+				minetest.chat_send_player(name,"ERROR: No message.")
+			else
+				random_messages.add_message(t)
+			end
+		else
+				minetest.chat_send_player(name,"ERROR: Invalid command.")
+		end
+	end
+}
+
+minetest.register_chatcommand("random_messages", register_chatcommand_table)
+minetest.register_chatcommand("rmessages", register_chatcommand_table)