1
  2
  3
  4
  5
  6
  7
  8
  9
 10
 11
 12
 13
 14
 15
 16
 17
 18
 19
 20
 21
 22
 23
 24
 25
 26
 27
 28
 29
 30
 31
 32
 33
 34
 35
 36
 37
 38
 39
 40
 41
 42
 43
 44
 45
 46
 47
 48
 49
 50
 51
 52
 53
 54
 55
 56
 57
 58
 59
 60
 61
 62
 63
 64
 65
 66
 67
 68
 69
 70
 71
 72
 73
 74
 75
 76
 77
 78
 79
 80
 81
 82
 83
 84
 85
 86
 87
 88
 89
 90
 91
 92
 93
 94
 95
 96
 97
 98
 99
100
101
102
103
104
105
106
107
108
109
110
111
112
113

#[cfg(all(feature = "interrupt-handler", not(feature = "disable-interrupts")))]
mod _impl {
    use std::{
        io,
        sync::atomic::{AtomicUsize, Ordering},
    };

    pub fn init_handler(mut message_channel: impl io::Write + Send + 'static) {
        ctrlc::set_handler(move || {
            const MESSAGES: &[&str] = &[
                "interrupt requested", 
                "please wait…", 
                "the program will respond soon…", 
                "if the program doesn't respond quickly enough, please let us know here: https://github.com/Byron/gitoxide/issues"
            ];
            static CURRENT_MESSAGE: AtomicUsize = AtomicUsize::new(0);
            if !super::is_triggered() {
                CURRENT_MESSAGE.store(0, Ordering::Relaxed);
            }
            let msg_idx =CURRENT_MESSAGE.fetch_add(1, Ordering::Relaxed);
            super::IS_INTERRUPTED.store(true, Ordering::Relaxed);
            writeln!(message_channel, "{}", MESSAGES[msg_idx % MESSAGES.len()]).ok();
        })
        .expect("it is up to the application to ensure only one interrupt handler is installed, and this function is called only once.")
    }
}
use std::io;
#[cfg(not(feature = "disable-interrupts"))]
use std::sync::atomic::{AtomicBool, Ordering};

#[cfg(any(feature = "disable-interrupts", not(feature = "interrupt-handler")))]
mod _impl {
    use std::io;

    pub fn init_handler(_message_channel: impl io::Write + Send + 'static) {}
}
pub use _impl::init_handler;

pub struct Read<R> {
    pub inner: R,
}

impl<R> io::Read for Read<R>
where
    R: io::Read,
{
    fn read(&mut self, buf: &mut [u8]) -> io::Result<usize> {
        if is_triggered() {
            return Err(io::Error::new(io::ErrorKind::Other, "interrupted by user"));
        }
        self.inner.read(buf)
    }
}

impl<R> io::BufRead for Read<R>
where
    R: io::BufRead,
{
    fn fill_buf(&mut self) -> io::Result<&[u8]> {
        self.inner.fill_buf()
    }

    fn consume(&mut self, amt: usize) {
        self.inner.consume(amt)
    }
}

#[cfg(not(feature = "disable-interrupts"))]
static IS_INTERRUPTED: AtomicBool = AtomicBool::new(false);

#[cfg(not(feature = "disable-interrupts"))]
pub fn is_triggered() -> bool {
    IS_INTERRUPTED.load(Ordering::Relaxed)
}
#[cfg(feature = "disable-interrupts")]
pub fn is_triggered() -> bool {
    false
}
pub fn trigger() {
    #[cfg(not(feature = "disable-interrupts"))]
    IS_INTERRUPTED.store(true, Ordering::Relaxed);
}
pub fn reset() {
    #[cfg(not(feature = "disable-interrupts"))]
    IS_INTERRUPTED.store(false, Ordering::Relaxed);
}

/// Useful if some parts of the program set the interrupt programmatically to cause others to stop, while
/// assuring the interrupt state is reset at the end of the function to avoid other side-effects.
///
/// Note that this is inherently racy and that this will only work deterministically if there is only one
/// top-level function running in a process.
pub struct ResetOnDrop {
    was_interrupted: bool,
}

impl Default for ResetOnDrop {
    fn default() -> Self {
        ResetOnDrop {
            was_interrupted: is_triggered(),
        }
    }
}

impl Drop for ResetOnDrop {
    fn drop(&mut self) {
        if self.was_interrupted {
            trigger()
        } else {
            reset()
        }
    }
}