1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
|
#[macro_use]
extern crate anyhow;
mod bar;
mod blocks_cache;
mod button_manager;
mod color;
mod config;
mod i3bar_protocol;
mod output;
mod pointer_btn;
mod protocol;
mod shared_state;
mod state;
mod status_cmd;
mod text;
mod utils;
mod wm_info_provider;
use std::io::{self, ErrorKind};
use std::os::fd::{AsRawFd, RawFd};
use std::path::PathBuf;
use clap::Parser;
use nix::fcntl::OFlag;
use signal_hook::consts::*;
use wayrs_client::{Connection, IoMode};
use state::State;
#[derive(Parser)]
#[command(author, version, about, long_about = None)]
struct Cli {
/// The path to a config file.
#[arg(short, long, value_name = "FILE")]
config: Option<PathBuf>,
}
fn main() -> anyhow::Result<()> {
let args = Cli::parse();
let (sig_read, sig_write) = nix::unistd::pipe2(OFlag::O_NONBLOCK | OFlag::O_CLOEXEC)?;
signal_hook::low_level::pipe::register(SIGUSR1, sig_write)?;
let (mut conn, globals) = Connection::connect_and_collect_globals()?;
let mut state = State::new(&mut conn, &globals, args.config.as_deref());
conn.flush(IoMode::Blocking)?;
loop {
let poll = Poll::new(conn.as_raw_fd(), sig_read, state.status_cmd_fd())?;
if poll.wayland {
match conn.recv_events(IoMode::NonBlocking) {
Ok(()) => {
conn.dispatch_events(&mut state);
conn.flush(IoMode::Blocking)?;
}
Err(e) if e.kind() == ErrorKind::WouldBlock => (),
Err(e) => bail!(e),
}
}
if poll.signal {
nix::unistd::read(sig_read.as_raw_fd(), &mut [0; 1])?;
state.toggle_visibility(&mut conn);
conn.flush(IoMode::Blocking)?;
}
if let Some(status_cmd) = &mut state.shared_state.status_cmd {
if poll.cmd {
match status_cmd.receive_blocks() {
Ok(None) => (),
Ok(Some(blocks)) => {
state.set_blocks(&mut conn, blocks);
conn.flush(IoMode::Blocking)?;
}
Err(e) => {
let _ = state.shared_state.status_cmd.take().unwrap().child.kill();
state.set_error(&mut conn, e);
conn.flush(IoMode::Blocking)?;
}
}
}
}
}
}
struct Poll {
wayland: bool,
signal: bool,
cmd: bool,
}
impl Poll {
fn new(wayland: RawFd, signal: RawFd, cmd: Option<RawFd>) -> io::Result<Self> {
let mut fds = [libc::pollfd {
fd: 0,
events: libc::POLLIN,
revents: 0,
}; 3];
fds[0].fd = wayland.as_raw_fd();
fds[1].fd = signal.as_raw_fd();
fds[2].fd = cmd.map_or(0, |cmd| cmd.as_raw_fd());
loop {
// nix' (0.27) poll() implementation is hard to work with because of the lifetimes. In
// particular, it makes reusing the same buffer across poll()s very hard. It is better
// to just call directly into the libc at this point, it's not that hard. At least it is
// safer that trying to trick nix by using `BorrowedFd::borrow_raw()`.
let result =
unsafe { libc::poll(fds.as_mut_ptr(), if cmd.is_some() { 3 } else { 2 }, -1) };
if result == -1 {
let err = io::Error::last_os_error();
if err.kind() != ErrorKind::Interrupted {
return Err(io::Error::last_os_error());
}
} else {
return Ok(Self {
wayland: fds[0].revents & libc::POLLIN != 0,
signal: fds[1].revents & libc::POLLIN != 0,
cmd: fds[2].revents & libc::POLLIN != 0,
});
}
}
}
}
|
