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use std::ffi::{CString, OsStr};
use std::io::{self, Write};
use std::os::unix::prelude::OsStrExt;
use std::os::unix::process::CommandExt;
use std::path::PathBuf;
use std::process::{Command, Stdio};
use std::ptr::null_mut;
use std::sync::atomic::{AtomicBool, Ordering};
use std::thread;
use std::time::Duration;
use anyhow::{ensure, Context};
use directories::UserDirs;
use git_version::git_version;
use niri_config::Config;
use smithay::output::Output;
use smithay::reexports::rustix::time::{clock_gettime, ClockId};
use smithay::utils::{Logical, Point, Rectangle, Size};
pub fn clone2<T: Clone, U: Clone>(t: (&T, &U)) -> (T, U) {
(t.0.clone(), t.1.clone())
}
pub fn version() -> String {
format!(
"{} ({})",
env!("CARGO_PKG_VERSION"),
git_version!(fallback = "unknown commit"),
)
}
pub fn get_monotonic_time() -> Duration {
let ts = clock_gettime(ClockId::Monotonic);
Duration::new(ts.tv_sec as u64, ts.tv_nsec as u32)
}
pub fn center(rect: Rectangle<i32, Logical>) -> Point<i32, Logical> {
rect.loc + rect.size.downscale(2).to_point()
}
pub fn output_size(output: &Output) -> Size<i32, Logical> {
let output_scale = output.current_scale().integer_scale();
let output_transform = output.current_transform();
let output_mode = output.current_mode().unwrap();
output_transform
.transform_size(output_mode.size)
.to_logical(output_scale)
}
pub fn make_screenshot_path(config: &Config) -> anyhow::Result<Option<PathBuf>> {
let Some(path) = &config.screenshot_path else {
return Ok(None);
};
let format = CString::new(path.clone()).context("path must not contain nul bytes")?;
let mut buf = [0u8; 2048];
let mut path;
unsafe {
let time = libc::time(null_mut());
ensure!(time != -1, "error in time()");
let tm = libc::localtime(&time);
ensure!(!tm.is_null(), "error in localtime()");
let rv = libc::strftime(buf.as_mut_ptr().cast(), buf.len(), format.as_ptr(), tm);
ensure!(rv != 0, "error formatting time");
path = PathBuf::from(OsStr::from_bytes(&buf[..rv]));
}
if let Ok(rest) = path.strip_prefix("~") {
let dirs = UserDirs::new().context("error retrieving home directory")?;
path = [dirs.home_dir(), rest].iter().collect();
}
Ok(Some(path))
}
pub static REMOVE_ENV_RUST_BACKTRACE: AtomicBool = AtomicBool::new(false);
pub static REMOVE_ENV_RUST_LIB_BACKTRACE: AtomicBool = AtomicBool::new(false);
/// Spawns the command to run independently of the compositor.
pub fn spawn<T: AsRef<OsStr> + Send + 'static>(command: Vec<T>) {
let _span = tracy_client::span!();
if command.is_empty() {
return;
}
// Spawning and waiting takes some milliseconds, so do it in a thread.
let res = thread::Builder::new()
.name("Command Spawner".to_owned())
.spawn(move || {
let (command, args) = command.split_first().unwrap();
spawn_sync(command, args);
});
if let Err(err) = res {
warn!("error spawning a thread to spawn the command: {err:?}");
}
}
fn spawn_sync(command: impl AsRef<OsStr>, args: impl IntoIterator<Item = impl AsRef<OsStr>>) {
let _span = tracy_client::span!();
let command = command.as_ref();
let mut process = Command::new(command);
process
.args(args)
.stdin(Stdio::null())
.stdout(Stdio::null())
.stderr(Stdio::null());
// Remove RUST_BACKTRACE and RUST_LIB_BACKTRACE from the environment if needed.
if REMOVE_ENV_RUST_BACKTRACE.load(Ordering::Relaxed) {
process.env_remove("RUST_BACKTRACE");
}
if REMOVE_ENV_RUST_LIB_BACKTRACE.load(Ordering::Relaxed) {
process.env_remove("RUST_LIB_BACKTRACE");
}
// Double-fork to avoid having to waitpid the child.
unsafe {
process.pre_exec(|| {
match libc::fork() {
-1 => return Err(io::Error::last_os_error()),
0 => (),
_ => libc::_exit(0),
}
Ok(())
});
}
let mut child = match process.spawn() {
Ok(child) => child,
Err(err) => {
warn!("error spawning {command:?}: {err:?}");
return;
}
};
match child.wait() {
Ok(status) => {
if !status.success() {
warn!("child did not exit successfully: {status:?}");
}
}
Err(err) => {
warn!("error waiting for child: {err:?}");
}
}
}
pub fn write_png_rgba8(
w: impl Write,
width: u32,
height: u32,
pixels: &[u8],
) -> Result<(), png::EncodingError> {
let mut encoder = png::Encoder::new(w, width, height);
encoder.set_color(png::ColorType::Rgba);
encoder.set_depth(png::BitDepth::Eight);
let mut writer = encoder.write_header()?;
writer.write_image_data(pixels)
}
#[cfg(feature = "dbus")]
pub fn show_screenshot_notification(image_path: Option<PathBuf>) {
let mut notification = notify_rust::Notification::new();
notification
.summary("Screenshot captured")
.body("You can paste the image from the clipboard.")
.urgency(notify_rust::Urgency::Normal)
.hint(notify_rust::Hint::Transient(true));
// Try to add the screenshot as an image if possible.
if let Some(path) = image_path {
match path.canonicalize() {
Ok(path) => match url::Url::from_file_path(path) {
Ok(url) => {
notification.image_path(url.as_str());
}
Err(err) => {
warn!("error converting screenshot path to file url: {err:?}");
}
},
Err(err) => {
warn!("error canonicalizing screenshot path: {err:?}");
}
}
}
if let Err(err) = notification.show() {
warn!("error showing screenshot notification: {err:?}");
}
}
#[inline(never)]
pub fn cause_panic() {
let a = Duration::from_secs(1);
let b = Duration::from_secs(2);
let _ = a - b;
}
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