Forums Scripts & Popups on input doesn't work for /msg

I have a script that sends text from one channel to another with /msg $chan

So I did a script today to manage that text entered there, but I discover the script can't handle any text with ON INPUT
When I type and press enter it reads perfectly, but when I send the text with /msg # command, nothing happens.

I wonder if there's any event trigger command to read messages send by myself besides ON INPUT

thanks in advance