pokeme.rs

        match event {
            // Sample structure.
            // Ok(Message(Standard { ts: "1465616511.000007", channel: Some("G0RFEFRF1"),
            //    user: Some("U04R67MSW"), text: Some("#sloakme"), is_starred: None,
            //    pinned_to: None, reactions: None, edited: None, attachments: None }))
            Ok(&slack::Event::Message(slack::Message::Standard {
                channel: Some(ref channel),
                user: Some(ref user),
                text: Some(ref text),
                ..
            })) if text.contains("#pokeme") => {
                let pokemon = thread_rng().choose(&self.pokedex).unwrap();
                let attachment_json = json::encode(&vec![attachment_for_pokemon(pokemon)]).unwrap();
                let _ = cli.post_message(
                    channel,
                    &format!("You are a {}!", &pokemon.species),
                    Some(&attachment_json));
            },
            Ok(_) => (),
            Err(err) => println!("Error on event: {}", err),
        }