erb module example

helloworld.erl

-module(helloworld).
-behaviour(gen_server).
-include("erb.hrl").

-export([start_link/1]).
-export([init/1, handle_call/3, handle_cast/2, handle_info/2, terminate/2, code_change/3]).
-define(SERVER, ?MODULE).

start_link(Bot) ->
    gen_server:start_link(?SERVER, ?MODULE, [Bot], []).

init([Bot]) ->
    ok = gen_server:call(Bot#bot.router, {subscribeToCommand, hello}),
    {ok, {}}.

handle_call(_Request, _From, State) ->
    {noreply, State}.

handle_cast({hello, Data}, State) ->
    [Nick|_] = string:tokens(Data#data.origin, "!@"),
    Message = io_lib:format("Hello, ~s!", [Nick]),
    ok = gen_server:cast((State#state.bot)#bot.dispatcher, {privmsg, Data#data.destination, Message}),
    {noreply, State};
handle_cast(_Request, State) ->
    {noreply, State}.

handle_info(_Reqest, State) ->
    {noreply, State}.

terminate(_Reason, _State) ->
    ok.

code_change(_OldVsn, State, _Extra) ->
    {ok, State}.