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use std::fs;
use std::io;
use std::path::{Path, PathBuf};
use std::process::{Command, Child, Stdio};
use std::sync::{Mutex, Arc};
use systray;
use dialog::{self, DialogBox};
use tempfile::tempdir;
use crate::error::*;
mod error;
const ICON_EXCLAM_PNG: &[u8] = include_bytes!("../resources/exclam.png");
const ICON_OK_PNG: &[u8] = include_bytes!("../resources/ok.png");
fn join(sep: &str, v: &[String]) -> String {
let mut res = String::new();
let mut first = true;
for item in v {
if first { first = false; }
else { res.push_str(sep); }
res.push_str(item);
}
res
}
struct State {
// Child is 'cat >/dev/null', with stdin piped.
// Close stdin to terminate.
inhibitor: Option<(Child, Vec<String>)>,
ok_path: String,
exclam_path: String,
}
impl State {
fn new(ok_path: &str, exclam_path: &str) -> State {
State {
inhibitor: None,
ok_path: ok_path.to_string(),
exclam_path: exclam_path.to_string(),
}
}
fn what_inhibited(&self) -> Option<&[String]> {
match &self.inhibitor {
Some((_, v)) => Some(v),
None => None,
}
}
fn inhibit(&mut self, what: &[String]) -> io::Result<()> {
self.uninhibit()?;
let mut whatarg = "--what=".to_string();
whatarg.push_str(&join(":", what));
let child = Command::new("systemd-inhibit")
.arg(whatarg)
.arg("--who=Tom's acpi-inhibitor")
.arg("--why=User request")
.arg("cat")
.stdin(Stdio::piped())
.stdout(Stdio::null())
.spawn()?;
self.inhibitor = Some((child, what.to_vec()));
Ok(())
}
fn uninhibit(&mut self) -> io::Result<()> {
if let Some((ch, _)) = &mut self.inhibitor {
// This automatically closes the child's stdin
ch.wait()?;
self.inhibitor = None;
}
Ok(())
}
fn poll(&mut self) -> io::Result<()> {
if let Some((ch, _)) = &mut self.inhibitor {
if ch.try_wait()?.is_some() {
self.inhibitor = None;
}
}
Ok(())
}
}
fn show_dialog(title: &str, body: &str) -> io::Result<()> {
dialog::Message::new(body).title(title).show()
.map_err(|e| io::Error::new(io::ErrorKind::Other, format!("{}", e)))
}
fn status_message(state: &mut State) -> io::Result<String> {
state.poll()?;
let mut msg;
match state.what_inhibited() {
Some(what) => {
msg = "Currently inhibiting: ".to_string();
msg.push_str(&join(", ", what));
}
None => {
msg = "Currently functioning normally (not inhibited)".to_string();
}
}
Ok(msg)
}
fn update_icon(app: &mut systray::Application, state: &mut State) -> io::Result<()> {
match state.what_inhibited() {
Some(_) => app.set_icon_from_file(&state.exclam_path).iores(),
None => app.set_icon_from_file(&state.ok_path).iores(),
}
}
fn materialise_icon(dir: &Path, fname: &str, bytes: &[u8]) -> io::Result<PathBuf> {
let mut pathbuf = dir.to_path_buf();
pathbuf.push(fname);
fs::write(&pathbuf, bytes)?;
Ok(pathbuf)
}
fn main() -> io::Result<()> {
let resources_dir = tempdir()?;
let resources_path = resources_dir.path();
let icon_ok_path = materialise_icon(&resources_path, "ok.png", ICON_OK_PNG)?;
let icon_exclam_path = materialise_icon(&resources_path, "exclam.png", ICON_EXCLAM_PNG)?;
let mut app = systray::Application::new().iores()?;
let state = Arc::new(Mutex::new(State::new(
icon_ok_path.to_str().unwrap(),
icon_exclam_path.to_str().unwrap()
)));
app.set_icon_from_file(icon_ok_path.to_str().unwrap()).iores()?;
{
let state = state.clone();
app.add_menu_item("Status", move |window| {
let mut state = state.as_ref().lock().unwrap();
let msg = status_message(&mut state)?;
update_icon(window, &mut state)?;
show_dialog("acpi-inhibitor status", &msg)
}).iores()?;
}
app.add_menu_separator().iores()?;
macro_rules! switcher_menu {
($label:expr, $keys:expr) => {{
let state = state.clone();
app.add_menu_item($label, move |mut window| {
let mut state = state.as_ref().lock().unwrap();
let keys = $keys;
if state.what_inhibited() == Some(keys) {
state.uninhibit()?;
} else {
state.inhibit(keys)?;
}
update_icon(&mut window, &mut state)?;
Ok::<_, io::Error>(())
}).iores()?;
}}
}
switcher_menu!("Shutdown/sleep/idle", &["shutdown".to_string(), "sleep".to_string(), "idle".to_string()]);
switcher_menu!("Lid switch", &["handle-lid-switch".to_string()]);
app.add_menu_separator().iores()?;
app.add_menu_item("Quit", |window| {
window.quit();
Ok::<_, systray::Error>(())
}).iores()?;
app.wait_for_message().iores()
}
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