1 files changed, 93 insertions, 0 deletions
diff --git a/vendor/gix-prompt/src/unix.rs b/vendor/gix-prompt/src/unix.rs
new file mode 100644
index 000000000..a08d2d777
--- /dev/null
+++ b/vendor/gix-prompt/src/unix.rs
@@ -0,0 +1,93 @@
+/// The path to the default TTY on linux
+pub const TTY_PATH: &str = "/dev/tty";
+
+#[cfg(unix)]
+pub(crate) mod imp {
+    use std::{
+        io::{BufRead, Write},
+        os::unix::io::{AsRawFd, RawFd},
+    };
+
+    use nix::sys::{termios, termios::Termios};
+    use parking_lot::{const_mutex, lock_api::MutexGuard, Mutex, RawMutex};
+
+    use crate::{unix::TTY_PATH, Error, Mode, Options};
+
+    static TERM_STATE: Mutex<Option<Termios>> = const_mutex(None);
+
+    /// Ask the user given a `prompt`, returning the result.
+    pub(crate) fn ask(prompt: &str, Options { mode, .. }: &Options<'_>) -> Result<String, Error> {
+        match mode {
+            Mode::Disable => Err(Error::Disabled),
+            Mode::Hidden => {
+                let state = TERM_STATE.lock();
+                let mut in_out = std::fs::OpenOptions::new().write(true).read(true).open(TTY_PATH)?;
+                let restore = save_term_state_and_disable_echo(state, in_out.as_raw_fd())?;
+                in_out.write_all(prompt.as_bytes())?;
+
+                let mut buf_read = std::io::BufReader::with_capacity(64, in_out);
+                let mut out = String::with_capacity(64);
+                buf_read.read_line(&mut out)?;
+
+                out.pop();
+                if out.ends_with('\r') {
+                    out.pop();
+                }
+                restore.now()?;
+                Ok(out)
+            }
+            Mode::Visible => {
+                let mut in_out = std::fs::OpenOptions::new().write(true).read(true).open(TTY_PATH)?;
+                in_out.write_all(prompt.as_bytes())?;
+
+                let mut buf_read = std::io::BufReader::with_capacity(64, in_out);
+                let mut out = String::with_capacity(64);
+                buf_read.read_line(&mut out)?;
+                Ok(out.trim_end().to_owned())
+            }
+        }
+    }
+
+    type TermiosGuard<'a> = MutexGuard<'a, RawMutex, Option<Termios>>;
+
+    struct RestoreTerminalStateOnDrop<'a> {
+        state: TermiosGuard<'a>,
+        fd: RawFd,
+    }
+
+    impl<'a> RestoreTerminalStateOnDrop<'a> {
+        fn now(mut self) -> Result<(), Error> {
+            let state = self.state.take().expect("BUG: we exist only if something is saved");
+            termios::tcsetattr(self.fd, termios::SetArg::TCSAFLUSH, &state)?;
+            Ok(())
+        }
+    }
+
+    impl<'a> Drop for RestoreTerminalStateOnDrop<'a> {
+        fn drop(&mut self) {
+            if let Some(state) = self.state.take() {
+                termios::tcsetattr(self.fd, termios::SetArg::TCSAFLUSH, &state).ok();
+            }
+        }
+    }
+
+    fn save_term_state_and_disable_echo(
+        mut state: TermiosGuard<'_>,
+        fd: RawFd,
+    ) -> Result<RestoreTerminalStateOnDrop<'_>, Error> {
+        assert!(
+            state.is_none(),
+            "BUG: recursive calls are not possible and we restore afterwards"
+        );
+
+        let prev = termios::tcgetattr(fd)?;
+        let mut new = prev.clone();
+        *state = prev.into();
+
+        new.local_flags &= !termios::LocalFlags::ECHO;
+        new.local_flags |= termios::LocalFlags::ECHONL;
+        termios::tcsetattr(fd, termios::SetArg::TCSAFLUSH, &new)?;
+
+        Ok(RestoreTerminalStateOnDrop { fd, state })
+    }
+}