kenshii 0.2.0

Disk usage analyzer written in Rust
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mod app;
mod tree;
mod treemap;
mod ui;

use app::App;
use clap::Parser;
use crossterm::{
    event::{self, Event, KeyCode, KeyEventKind},
    execute,
    terminal::{disable_raw_mode, enable_raw_mode, EnterAlternateScreen, LeaveAlternateScreen},
};
use ratatui::{backend::CrosstermBackend, widgets::ListState, Terminal};
use std::io::{self, Stdout};
use std::path::PathBuf;
use std::time::{Duration, Instant};
use tree::DirNode;

#[derive(Parser, Debug)]
#[command(name = "wiztree-rs", version, about)]
struct Args {
    #[arg(default_value = ".")]
    path: PathBuf,
}

fn main() -> io::Result<()> {
    let args = Args::parse();

    let path = args
        .path
        .canonicalize()
        .unwrap_or_else(|_| args.path.clone());
    if !path.is_dir() {
        eprintln!("Not a directory: {}", path.display());
        std::process::exit(1);
    }

    eprintln!("Scanning {} ...", path.display());
    let start = Instant::now();
    let root = DirNode::scan(&path);
    eprintln!(
        "Done in {:.2}s — {} bytes across {} files.",
        start.elapsed().as_secs_f64(),
        root.size,
        root.file_count
    );

    let mut terminal = setup_terminal()?;
    let mut app = App::new(root);
    let result = run(&mut terminal, &mut app, &path);
    restore_terminal(&mut terminal)?;

    if let Err(err) = result {
        eprintln!("Error: {err}");
        std::process::exit(1);
    }
    Ok(())
}

fn setup_terminal() -> io::Result<Terminal<CrosstermBackend<Stdout>>> {
    enable_raw_mode()?;
    let mut stdout = io::stdout();
    execute!(stdout, EnterAlternateScreen)?;
    Terminal::new(CrosstermBackend::new(stdout))
}

fn restore_terminal(terminal: &mut Terminal<CrosstermBackend<Stdout>>) -> io::Result<()> {
    disable_raw_mode()?;
    execute!(terminal.backend_mut(), LeaveAlternateScreen)?;
    terminal.show_cursor()
}

fn run(
    terminal: &mut Terminal<CrosstermBackend<Stdout>>,
    app: &mut App,
    scan_path: &PathBuf,
) -> io::Result<()> {
    let mut list_state = ListState::default();

    loop {
        list_state.select(Some(app.selected));
        terminal.draw(|f| ui::draw(f, app, &mut list_state))?;

        if event::poll(Duration::from_millis(150))? {
            if let Event::Key(key) = event::read()? {
                if key.kind != KeyEventKind::Press {
                    continue;
                }
                match key.code {
                    KeyCode::Char('q') | KeyCode::Esc => break,
                    KeyCode::Down | KeyCode::Char('j') => app.move_down(),
                    KeyCode::Up | KeyCode::Char('k') => app.move_up(),
                    KeyCode::PageDown => app.page_down(10),
                    KeyCode::PageUp => app.page_up(10),
                    KeyCode::Enter | KeyCode::Right | KeyCode::Char('l') => app.enter(),
                    KeyCode::Backspace | KeyCode::Left | KeyCode::Char('h') => app.back(),
                    KeyCode::Char('s') => app.toggle_sort(),
                    KeyCode::Char('t') | KeyCode::Tab => app.toggle_bottom_panel(),
                    KeyCode::Char('r') => {
                        app.status = Some("rescanning...".to_string());
                        terminal.draw(|f| ui::draw(f, app, &mut list_state))?;
                        let root = DirNode::scan(scan_path);
                        *app = App::new(root);
                    }
                    _ => {}
                }
            }
        }
    }
    Ok(())
}