From c36f43c75967b1a5dc662086e6f51ea494d607b2 Mon Sep 17 00:00:00 2001
From: Zheyu Shen <arsdragonfly@gmail.com>
Date: Fri, 2 Oct 2015 11:02:01 +0800
Subject: [PATCH] Add live message adding & removal

---
 init.lua | 83 ++++++++++++++++++++++++++++++++++++++++++++++++++++++--
 1 file changed, 80 insertions(+), 3 deletions(-)

diff --git a/init.lua b/init.lua
index c812498..a68d9b2 100644
--- a/init.lua
+++ b/init.lua
@@ -4,23 +4,41 @@ arsdragonfly@gmail.com
 6/19/2013
 --]]
 --Time between two subsequent messages.
-local MESSAGE_INTERVAL = 0 
+local MESSAGE_INTERVAL = 0
 
 math.randomseed(os.time())
 
 random_messages = {}
 random_messages.messages = {} --This table contains all messages.
 
+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();
-	return 120 
+	return 120
 end
 
 function random_messages.set_interval() --Read the interval from minetest.conf(set it if it doesn'st exist)
 	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")
@@ -45,7 +63,33 @@ function random_messages.display_message(message_number)
 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:
@@ -61,3 +105,36 @@ minetest.register_globalstep(function(dtime)
 	end
 end)
 
+local register_chatcommand_table = {
+	params = "viewmessages | removemessage <number> | addmessage <number>",
+	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)