Function tbot::compositors::filter_map[][src]

pub fn filter_map<C, T, M, MF, H, HF>(
    mapper: M,
    handler: H
) -> impl Fn(Arc<C>) -> BoxFuture<'static, ()> where
    C: Context,
    T: Send + 'static,
    M: Fn(Arc<C>) -> MF + Send + Sync + 'static,
    MF: Future<Output = Option<T>> + Send + 'static,
    H: Fn(T) -> HF + Send + Sync + 'static,
    HF: Future<Output = ()> + Send + 'static, 

Filters and maps updates: calls predicate, and if it returned Some, calls handler with that value.

Example

use tbot::{Bot, contexts::Text, compositors::filter_map};
use std::sync::Arc;

let mut bot = Bot::from_env("BOT_TOKEN").event_loop();
bot.text(filter_map(
    |context: Arc<Text>| async move { context.reply_to.clone() },
    |reply_to| async move {
        println!("Recevied a message in reply to {}", reply_to.id);
    },
));