diskr 0.1.0

Lightweight terminal file explorer and disk/storage manager for macOS
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use crossbeam_channel::Sender;
use rayon::prelude::*;
use std::path::PathBuf;

use crate::bulkstat;

pub type ScanId = u64;

/// Messages from the scanner thread back to the UI.
pub enum ScanMsg {
    DirSize {
        scan_id: ScanId,
        path: PathBuf,
        size: u64,
    },
    AllDone {
        scan_id: ScanId,
    },
}

pub struct Scanner {
    tx: Sender<ScanMsg>,
}

impl Scanner {
    pub fn new(tx: Sender<ScanMsg>) -> Self {
        Self { tx }
    }

    /// Scan each directory in `dirs` for its TOTAL recursive size on disk.
    /// Must NOT block the UI thread.
    pub fn scan_all(&self, scan_id: ScanId, dirs: Vec<PathBuf>) {
        let tx = self.tx.clone();
        std::thread::spawn(move || {
            dirs.into_par_iter().for_each(|dir| {
                let size = bulkstat::size_of_dir(&dir);
                let _ = tx.send(ScanMsg::DirSize {
                    scan_id,
                    path: dir,
                    size,
                });
            });
            let _ = tx.send(ScanMsg::AllDone { scan_id });
        });
    }
}