init.lua

channels = {}
channels.huds = {}
channels.players = {}

channels.allow_global_channel = minetest.settings:get_bool("channels.allow_global_channel") ~= false
channels.disable_private_messages = minetest.settings:get_bool("channels.disable_private_messages") == true
channels.suggested_channel = minetest.settings:get("channels.suggested_channel")

dofile(minetest.get_modpath("channels") .. "/chatcommands.lua")
dofile(minetest.get_modpath("channels") .. "/saves.lua")




if channels.disable_private_messages then
    minetest.registered_chatcommands["msg"] = nil
end

local function remind_global_off()
	if not channels.allow_global_channel and channels.suggested_channel then
        local players_online = minetest.get_connected_players()
        if #players_online > 0 then
            channels.say_chat("*server*",
                "<*server*> Out-of-channel chat is off." ..
                "(try '/channel join " .. channels.suggested_channel .. "' ?)"
            )
        end
	end
end

if not channels.allow_global_channel then
	local global_inhibition_counter = 0 -- local to the file

	minetest.register_globalstep(function(dtime)
		global_inhibition_counter = global_inhibition_counter + dtime
		if global_inhibition_counter > 5*60 then
			global_inhibition_counter = 0
		else
			return
		end

		remind_global_off()
	end)
end

minetest.register_on_chat_message(function(name, message)
	local pl_channel = channels.players[name]

	if pl_channel == "" then
		channels.players[name] = nil
		pl_channel = nil
	end

	if not pl_channel then
		if not channels.allow_global_channel then
			minetest.chat_send_player(name, "No channel selected. Run '/channel' for more info")
			-- return true to prevent subsequent/global handler from kicking in
			return true
		end
	end
	
	channels.say_chat(name, "<" .. name .. "> " .. message, pl_channel)
	return true
end)

minetest.register_on_joinplayer(function(player)
    local name = player:get_player_name()
	local playerchannel = channels.players[name]
    if playerchannel then
        channels.players[name] = nil -- leave channel temporarily, to re-register the HUD
        channels.command_join(name, playerchannel)
        minetest.chat_send_player(name, "Joined chat channel #"..playerchannel)
    end
end)

minetest.register_on_leaveplayer(function(player)
	local name = player:get_player_name()
	-- do not nil channels.players[name]; it forms part of the data for saving
	channels.huds[name] = nil
end)