build(ariadne): vendor clap

third_party/crates/is_terminal_polyfill-1.70.2/src/lib.rs

@@ -0,0 +1,50 @@
+//! > Polyfill for `is_terminal` stdlib feature for use with older MSRVs
+
+#![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<'_>
+);