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//! > Polyfill for `is_terminal` stdlib feature for use with older MSRVs
#![cfg_attr(docsrs, feature(doc_auto_cfg))]
#![warn(clippy::print_stderr)]
#![warn(clippy::print_stdout)]
/// Trait to determine if a descriptor/handle refers to a terminal/tty.
pub trait IsTerminal: sealed::Sealed {
/// Returns `true` if the descriptor/handle refers to a terminal/tty.
///
/// On platforms where Rust does not know how to detect a terminal yet, this will return
/// `false`. This will also return `false` if an unexpected error occurred, such as from
/// passing an invalid file descriptor.
///
/// # Platform-specific behavior
///
/// On Windows, in addition to detecting consoles, this currently uses some heuristics to
/// detect older msys/cygwin/mingw pseudo-terminals based on device name: devices with names
/// starting with `msys-` or `cygwin-` and ending in `-pty` will be considered terminals.
/// Note that this [may change in the future][changes].
///
/// [changes]: std::io#platform-specific-behavior
fn is_terminal(&self) -> bool;
}
mod sealed {
pub trait Sealed {}
}
macro_rules! impl_is_terminal {
($($t:ty),*$(,)?) => {$(
impl sealed::Sealed for $t {}
impl IsTerminal for $t {
#[inline]
fn is_terminal(&self) -> bool {
std::io::IsTerminal::is_terminal(self)
}
}
)*}
}
impl_is_terminal!(
std::fs::File,
std::io::Stdin,
std::io::StdinLock<'_>,
std::io::Stdout,
std::io::StdoutLock<'_>,
std::io::Stderr,
std::io::StderrLock<'_>
);
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