dz6 0.8.0

Fast Vim-inspired hex editor for the terminal
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mod app;
mod commands;
mod config;
mod database;
mod draw;
mod editor;
mod events;
mod global;
mod header;
mod hex;
mod initfile;
mod input_history;
mod reader;
mod ruler;
mod text;
mod themes;
mod util;
mod widgets;

use std::process;

use clap::Parser;
use ratatui::crossterm::event;

use app::App;

/// vim-like hexadecimal editor
#[derive(Parser, Debug)]
#[command(version, about, long_about = None)]
struct Args {
    /// File to open
    file: String,

    /// Initial cursor offset (hex default; `t` suffix = decimal)
    #[arg(short, long, default_value = "0")]
    offset: String,

    /// Set read-only mode
    #[arg(short, long)]
    readonly: bool,
}

fn main() {
    let args = Args::parse();
    let mut app = App::new();
    let cursor_offset = util::parse_offset(&args.offset).unwrap_or_default();

    app.load_file(&args.file, cursor_offset, args.readonly)
        .unwrap_or_else(|e| {
            eprintln!("{}: {}", args.file, e);
            process::exit(1);
        });

    app.list_state.select_first();

    // read init file ignoring errors
    let _ = app.read_initfile();

    let mut terminal = ratatui::init();

    while app.running {
        terminal
            .draw(|f| {
                update_page_size(&mut app, f.area().height);
                app.screen = f.area();
                draw::draw(f, &mut app)
            })
            .expect("failed to draw frame");

        let event = event::read().expect("unable to read event");
        events::handle_events(&mut app, event).expect("unable to read events");
    }

    ratatui::restore();
}

/// Page size is dynamically calculated as:
/// frame height - (command line + status line + header) * bytes per line
pub fn update_page_size(app: &mut App, height: u16) {
    // Prevent panic on underflow with small screen sizes
    // Currently, we can't have them because of widgets such as Calculator,
    // but we might add support for such small screen sizes in the future
    let page_size = if height.checked_sub(3).is_some() {
        (height - 3) as usize * app.config.hex_mode_bytes_per_line
    } else {
        app.config.hex_mode_bytes_per_line
    };

    if page_size != app.reader.page_current_size {
        app.reader.page_current_size = page_size;
        app.reader.page_end = app.reader.page_start + page_size.wrapping_sub(1);
    }
}

#[macro_export]
macro_rules! beep {
    () => {
        print!("\x07")
    };
}