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//! TTY related functionality.
use std::path::PathBuf;
use std::sync::Arc;
use std::{env, io};
use polling::{Event, PollMode, Poller};
#[cfg(not(windows))]
mod unix;
#[cfg(not(windows))]
pub use self::unix::*;
#[cfg(windows)]
pub mod windows;
#[cfg(windows)]
pub use self::windows::*;
/// Configuration for the `Pty` interface.
#[derive(Clone, Debug, PartialEq, Eq, Default)]
pub struct Options {
/// Shell options.
///
/// [`None`] will use the default shell.
pub shell: Option<Shell>,
/// Shell startup directory.
pub working_directory: Option<PathBuf>,
/// Remain open after child process exits.
pub hold: bool,
}
/// Shell options.
#[derive(Clone, Debug, PartialEq, Eq, Default)]
pub struct Shell {
/// Path to a shell program to run on startup.
pub(crate) program: String,
/// Arguments passed to shell.
pub(crate) args: Vec<String>,
}
impl Shell {
pub fn new(program: String, args: Vec<String>) -> Self {
Self { program, args }
}
}
/// This trait defines the behaviour needed to read and/or write to a stream.
/// It defines an abstraction over polling's interface in order to allow either one
/// read/write object or a separate read and write object.
pub trait EventedReadWrite {
type Reader: io::Read;
type Writer: io::Write;
/// # Safety
///
/// The underlying sources must outlive their registration in the `Poller`.
unsafe fn register(&mut self, _: &Arc<Poller>, _: Event, _: PollMode) -> io::Result<()>;
fn reregister(&mut self, _: &Arc<Poller>, _: Event, _: PollMode) -> io::Result<()>;
fn deregister(&mut self, _: &Arc<Poller>) -> io::Result<()>;
fn reader(&mut self) -> &mut Self::Reader;
fn writer(&mut self) -> &mut Self::Writer;
}
/// Events concerning TTY child processes.
#[derive(Debug, PartialEq, Eq)]
pub enum ChildEvent {
/// Indicates the child has exited, with an error code if available.
Exited(Option<i32>),
}
/// A pseudoterminal (or PTY).
///
/// This is a refinement of EventedReadWrite that also provides a channel through which we can be
/// notified if the PTY child process does something we care about (other than writing to the TTY).
/// In particular, this allows for race-free child exit notification on UNIX (cf. `SIGCHLD`).
pub trait EventedPty: EventedReadWrite {
/// Tries to retrieve an event.
///
/// Returns `Some(event)` on success, or `None` if there are no events to retrieve.
fn next_child_event(&mut self) -> Option<ChildEvent>;
}
/// Setup environment variables.
pub fn setup_env() {
// Default to 'alacritty' terminfo if it is available, otherwise
// default to 'xterm-256color'. May be overridden by user's config
// below.
let terminfo = if terminfo_exists("alacritty") { "alacritty" } else { "xterm-256color" };
env::set_var("TERM", terminfo);
// Advertise 24-bit color support.
env::set_var("COLORTERM", "truecolor");
// Prevent child processes from inheriting startup notification env.
env::remove_var("DESKTOP_STARTUP_ID");
env::remove_var("XDG_ACTIVATION_TOKEN");
}
/// Check if a terminfo entry exists on the system.
fn terminfo_exists(terminfo: &str) -> bool {
// Get first terminfo character for the parent directory.
let first = terminfo.get(..1).unwrap_or_default();
let first_hex = format!("{:x}", first.chars().next().unwrap_or_default() as usize);
// Return true if the terminfo file exists at the specified location.
macro_rules! check_path {
($path:expr) => {
if $path.join(first).join(terminfo).exists()
|| $path.join(&first_hex).join(terminfo).exists()
{
return true;
}
};
}
if let Some(dir) = env::var_os("TERMINFO") {
check_path!(PathBuf::from(&dir));
} else if let Some(home) = home::home_dir() {
check_path!(home.join(".terminfo"));
}
if let Ok(dirs) = env::var("TERMINFO_DIRS") {
for dir in dirs.split(':') {
check_path!(PathBuf::from(dir));
}
}
if let Ok(prefix) = env::var("PREFIX") {
let path = PathBuf::from(prefix);
check_path!(path.join("etc/terminfo"));
check_path!(path.join("lib/terminfo"));
check_path!(path.join("share/terminfo"));
}
check_path!(PathBuf::from("/etc/terminfo"));
check_path!(PathBuf::from("/lib/terminfo"));
check_path!(PathBuf::from("/usr/share/terminfo"));
check_path!(PathBuf::from("/boot/system/data/terminfo"));
// No valid terminfo path has been found.
false
}
|
