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//! Making it a little more convenient and safe to query whether
//! something is a terminal teletype or not.
//! This module defines the IsTty trait and the is_tty method to
//! return true if the item represents a terminal.
#[cfg(unix)]
use std::os::unix::io::AsRawFd;
#[cfg(windows)]
use std::os::windows::io::AsRawHandle;
#[cfg(windows)]
use winapi::um::consoleapi::GetConsoleMode;
/// Adds the is_tty method to types that might represent a terminal
pub trait IsTty {
/// Returns true if the instance is a terminal teletype, false
/// otherwise.
fn is_tty(&self) -> bool;
}
/// On unix, the `isatty()` library function returns true if a file
/// descriptor is a terminal. Let's implement `IsTty` for anything
/// that has an associated raw file descriptor.
#[cfg(unix)]
impl<S: AsRawFd> IsTty for S {
fn is_tty(&self) -> bool {
let fd = self.as_raw_fd();
unsafe { libc::isatty(fd) == 1 }
}
}
#[cfg(windows)]
impl<S: AsRawHandle> IsTty for S {
fn is_tty(&self) -> bool {
let mut mode = 0;
let ok = unsafe { GetConsoleMode(self.as_raw_handle() as *mut _, &mut mode) };
ok == 1
}
}