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use crate::common::{Result, Text, TextBuilder};
use crate::events::Event;
use crate::fuzzy;
use async_std::channel::{Receiver, Sender};
use async_std::prelude::*;
use std::collections::VecDeque;
const BUFFER_LIMIT: usize = 5000;
const POOL_LIMIT: usize = 50000;
pub async fn task(mut input_recv: Receiver<Event>, output_sender: Sender<Event>) -> Result<()> {
log::trace!("starting search engine");
let mut pool: VecDeque<Text> = VecDeque::new();
let mut count = 0;
let mut query = String::from("");
while let Some(event) = input_recv.next().await {
match event {
Event::NewLine(s) => {
log::trace!("line: {:?}", s);
pool.push_back(TextBuilder::build(&s));
count += 1;
if pool.len() > POOL_LIMIT {
log::trace!(
"pool limit ({:?}) exceeded, dropping first line",
POOL_LIMIT
);
let _f = pool.pop_front();
}
if count > BUFFER_LIMIT {
count = 0;
let matches = fuzzy::search(&query, &pool);
output_sender
.send(Event::Flush((matches, pool.len())))
.await?;
}
}
Event::EOF => {
log::trace!("all input data done");
let matches = fuzzy::search(&query, &pool);
output_sender
.send(Event::Flush((matches, pool.len())))
.await?;
}
Event::Search(prompt) => {
query = prompt.as_string();
log::trace!("performing new search: '{}'", query);
let matches = fuzzy::search(&query, &pool);
let results = Event::SearchDone((matches, pool.len(), prompt.timestamp()));
output_sender.send(results).await?;
}
Event::Done | Event::Exit => break,
_ => (),
};
}
log::trace!("search engine done");
Ok(())
}