How to compile ejabberd hooks in Eclipse

Question

I am trying to make simple ejabberd hooks or module. For this I follow these steps using eclipse.

1. create Erlang project and I gives reference to ejabberd source code , which is I have download from github.

2. Now I write code

   %% @author anuj
   %% @doc @todo Add description to hello_word.
   
   -module(hello_word).
   -behavior(gen_mod).
   -export([start/2,stop/1]).
   
   start(_Host, _Opt) ->
          ?INFO_MSG("Loading module 'mod_hello' ", []).
   
   stop(_Host) ->
             ok.
   

Now i am compile it using this command

(ErModule1_ejabberd@anuj)2> c(hello_word).

This gives this error message to me

hello_word.erl:11: undefined macro 'INFO_MSG/2'
hello_word.erl:8: function start/2 undefined
hello_word.erl:6: Warning: behaviour gen_mod undefined
error

Can anyone correct in this proccess how can i make a simple hook for ejabberd and compile it.

Answer 1

The INFO_MSG is a macro defined in logger.hrl. You need to include it in your file:

-include("logger.hrl").