1 files changed, 210 insertions, 0 deletions
diff --git a/vendor/atty/src/lib.rs b/vendor/atty/src/lib.rs
new file mode 100644
index 000000000..501cad694
--- /dev/null
+++ b/vendor/atty/src/lib.rs
@@ -0,0 +1,210 @@
+//! atty is a simple utility that answers one question
+//! > is this a tty?
+//!
+//! usage is just as simple
+//!
+//! ```
+//! if atty::is(atty::Stream::Stdout) {
+//!   println!("i'm a tty")
+//! }
+//! ```
+//!
+//! ```
+//! if atty::isnt(atty::Stream::Stdout) {
+//!   println!("i'm not a tty")
+//! }
+//! ```
+
+#![cfg_attr(unix, no_std)]
+
+#[cfg(unix)]
+extern crate libc;
+#[cfg(windows)]
+extern crate winapi;
+
+#[cfg(windows)]
+use winapi::shared::minwindef::DWORD;
+#[cfg(windows)]
+use winapi::shared::ntdef::WCHAR;
+
+/// possible stream sources
+#[derive(Clone, Copy, Debug)]
+pub enum Stream {
+    Stdout,
+    Stderr,
+    Stdin,
+}
+
+/// returns true if this is a tty
+#[cfg(all(unix, not(target_arch = "wasm32")))]
+pub fn is(stream: Stream) -> bool {
+    extern crate libc;
+
+    let fd = match stream {
+        Stream::Stdout => libc::STDOUT_FILENO,
+        Stream::Stderr => libc::STDERR_FILENO,
+        Stream::Stdin => libc::STDIN_FILENO,
+    };
+    unsafe { libc::isatty(fd) != 0 }
+}
+
+/// returns true if this is a tty
+#[cfg(target_os = "hermit")]
+pub fn is(stream: Stream) -> bool {
+    extern crate hermit_abi;
+
+    let fd = match stream {
+        Stream::Stdout => hermit_abi::STDOUT_FILENO,
+        Stream::Stderr => hermit_abi::STDERR_FILENO,
+        Stream::Stdin => hermit_abi::STDIN_FILENO,
+    };
+    hermit_abi::isatty(fd)
+}
+
+/// returns true if this is a tty
+#[cfg(windows)]
+pub fn is(stream: Stream) -> bool {
+    use winapi::um::winbase::{
+        STD_ERROR_HANDLE as STD_ERROR, STD_INPUT_HANDLE as STD_INPUT,
+        STD_OUTPUT_HANDLE as STD_OUTPUT,
+    };
+
+    let (fd, others) = match stream {
+        Stream::Stdin => (STD_INPUT, [STD_ERROR, STD_OUTPUT]),
+        Stream::Stderr => (STD_ERROR, [STD_INPUT, STD_OUTPUT]),
+        Stream::Stdout => (STD_OUTPUT, [STD_INPUT, STD_ERROR]),
+    };
+    if unsafe { console_on_any(&[fd]) } {
+        // False positives aren't possible. If we got a console then
+        // we definitely have a tty on stdin.
+        return true;
+    }
+
+    // At this point, we *could* have a false negative. We can determine that
+    // this is true negative if we can detect the presence of a console on
+    // any of the other streams. If another stream has a console, then we know
+    // we're in a Windows console and can therefore trust the negative.
+    if unsafe { console_on_any(&others) } {
+        return false;
+    }
+
+    // Otherwise, we fall back to a very strange msys hack to see if we can
+    // sneakily detect the presence of a tty.
+    unsafe { msys_tty_on(fd) }
+}
+
+/// returns true if this is _not_ a tty
+pub fn isnt(stream: Stream) -> bool {
+    !is(stream)
+}
+
+/// Returns true if any of the given fds are on a console.
+#[cfg(windows)]
+unsafe fn console_on_any(fds: &[DWORD]) -> bool {
+    use winapi::um::{consoleapi::GetConsoleMode, processenv::GetStdHandle};
+
+    for &fd in fds {
+        let mut out = 0;
+        let handle = GetStdHandle(fd);
+        if GetConsoleMode(handle, &mut out) != 0 {
+            return true;
+        }
+    }
+    false
+}
+
+/// Returns true if there is an MSYS tty on the given handle.
+#[cfg(windows)]
+unsafe fn msys_tty_on(fd: DWORD) -> bool {
+    use std::{mem, slice};
+
+    use winapi::{
+        ctypes::c_void,
+        shared::minwindef::MAX_PATH,
+        um::{
+            fileapi::FILE_NAME_INFO, minwinbase::FileNameInfo, processenv::GetStdHandle,
+            winbase::GetFileInformationByHandleEx,
+        },
+    };
+
+    let size = mem::size_of::<FILE_NAME_INFO>();
+    let mut name_info_bytes = vec![0u8; size + MAX_PATH * mem::size_of::<WCHAR>()];
+    let res = GetFileInformationByHandleEx(
+        GetStdHandle(fd),
+        FileNameInfo,
+        &mut *name_info_bytes as *mut _ as *mut c_void,
+        name_info_bytes.len() as u32,
+    );
+    if res == 0 {
+        return false;
+    }
+    let name_info: &FILE_NAME_INFO = &*(name_info_bytes.as_ptr() as *const FILE_NAME_INFO);
+    let s = slice::from_raw_parts(
+        name_info.FileName.as_ptr(),
+        name_info.FileNameLength as usize / 2,
+    );
+    let name = String::from_utf16_lossy(s);
+    // This checks whether 'pty' exists in the file name, which indicates that
+    // a pseudo-terminal is attached. To mitigate against false positives
+    // (e.g., an actual file name that contains 'pty'), we also require that
+    // either the strings 'msys-' or 'cygwin-' are in the file name as well.)
+    let is_msys = name.contains("msys-") || name.contains("cygwin-");
+    let is_pty = name.contains("-pty");
+    is_msys && is_pty
+}
+
+/// returns true if this is a tty
+#[cfg(target_arch = "wasm32")]
+pub fn is(_stream: Stream) -> bool {
+    false
+}
+
+#[cfg(test)]
+mod tests {
+    use super::{is, Stream};
+
+    #[test]
+    #[cfg(windows)]
+    fn is_err() {
+        // appveyor pipes its output
+        assert!(!is(Stream::Stderr))
+    }
+
+    #[test]
+    #[cfg(windows)]
+    fn is_out() {
+        // appveyor pipes its output
+        assert!(!is(Stream::Stdout))
+    }
+
+    #[test]
+    #[cfg(windows)]
+    fn is_in() {
+        assert!(is(Stream::Stdin))
+    }
+
+    #[test]
+    #[cfg(unix)]
+    fn is_err() {
+        assert!(is(Stream::Stderr))
+    }
+
+    #[test]
+    #[cfg(unix)]
+    fn is_out() {
+        assert!(is(Stream::Stdout))
+    }
+
+    #[test]
+    #[cfg(target_os = "macos")]
+    fn is_in() {
+        // macos on travis seems to pipe its input
+        assert!(is(Stream::Stdin))
+    }
+
+    #[test]
+    #[cfg(all(not(target_os = "macos"), unix))]
+    fn is_in() {
+        assert!(is(Stream::Stdin))
+    }
+}