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|
/*
* bb - bin.rs
*
* Copyright 2019 Manos Pitsidianakis
*
* bb is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* bb is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with bb. If not, see <http://www.gnu.org/licenses/>.
*/
//!
//! This crate contains the frontend stuff of the application. The application entry way on
//! `src/bin.rs` creates an event loop and passes input to the `ui` module.
//!
//! The mail handling stuff is done in the `bb` crate which includes all backend needs. The
//! split is done to theoretically be able to create different frontends with the same innards.
//!
extern crate crossbeam;
extern crate nix;
extern crate signal_hook;
extern crate termion;
use crossbeam::channel::{bounded, tick};
use crossbeam::select;
use libc::c_int;
use std::io::Error;
use std::time::Duration;
mod ui;
use ui::*;
fn notify(signals: &[c_int]) -> Result<crossbeam::channel::Receiver<c_int>, Error> {
let (s, r) = bounded(100);
let signals = signal_hook::iterator::Signals::new(signals)?;
std::thread::spawn(move || {
for signal in signals.forever() {
s.send(signal).unwrap();
}
});
Ok(r)
}
fn main() -> Result<(), Error> {
let signals = &[
signal_hook::SIGALRM,
signal_hook::SIGTERM,
signal_hook::SIGINT,
signal_hook::SIGQUIT,
/* Catch SIGWINCH to handle terminal resizing */
signal_hook::SIGWINCH,
];
let ticker = tick(Duration::from_millis(1600));
let signal_recvr = notify(signals)?;
/* Create the application State */
let mut state = State::new();
let receiver = state.receiver();
let window = Box::new(Window::new(
Box::new(ui::components::KernelMetrics::new()),
Box::new(ui::components::ProcessList::new()),
));
state.register_component(window);
state.render();
state.redraw(true);
/* Keep track of the input mode. See ui::UIMode for details */
'main: loop {
/* Poll on all channels. Currently we have the input channel for stdin, watching events and the signal watcher. */
select! {
recv(ticker) -> _ => {
state.redraw(true);
},
recv(signal_recvr) -> sig => {
eprintln!("got signal {:?}", sig);
match sig.unwrap() {
signal_hook::SIGWINCH => {
state.update_size();
state.render();
state.redraw(true);
},
_ => {}
}
},
recv(receiver) -> msg => {
match msg.unwrap() {
ThreadEvent::Input(Key::Ctrl('z')) => {
state.switch_to_main_screen();
//_thread_handler.join().expect("Couldn't join on the associated thread");
let self_pid = nix::unistd::Pid::this();
nix::sys::signal::kill(self_pid, nix::sys::signal::Signal::SIGSTOP).unwrap();
state.switch_to_alternate_screen();
state.restore_input();
// BUG: thread sends input event after one received key
state.update_size();
state.render();
state.redraw(true);
},
ThreadEvent::Input(k) => {
match k {
Key::Char('q') | Key::Char('Q') if state.mode == UIMode::Normal => {
drop(state);
break 'main;
},
key => {
state.rcv_event(UIEvent::Input(key));
state.redraw(false);
},
}
},
}
},
}
}
Ok(())
}
|
