cpython 0.2.0

Bindings to Python
Documentation 
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#[macro_use] extern crate cpython;

use cpython::{PyResult, Python, NoArgs, ObjectProtocol, PyDict};
use std::sync::atomic;
use std::sync::atomic::Ordering::Relaxed;

#[test]
fn no_args() {
    static CALL_COUNT: atomic::AtomicUsize = atomic::ATOMIC_USIZE_INIT;

    fn f(_py: Python) -> PyResult<usize> {
        Ok(CALL_COUNT.fetch_add(1, Relaxed))
    }

    let gil = Python::acquire_gil();
    let py = gil.python();
    let obj = py_fn!(py, f());

    assert_eq!(CALL_COUNT.load(Relaxed), 0);
    assert_eq!(obj.call(py, NoArgs, None).unwrap().extract::<i32>(py).unwrap(), 0);
    assert_eq!(obj.call(py, NoArgs, None).unwrap().extract::<i32>(py).unwrap(), 1);
    assert_eq!(CALL_COUNT.load(Relaxed), 2);
    assert!(obj.call(py, (1,), None).is_err());
    assert_eq!(CALL_COUNT.load(Relaxed), 2);
    assert_eq!(obj.call(py, NoArgs, Some(&PyDict::new(py))).unwrap().extract::<i32>(py).unwrap(), 2);
    assert_eq!(CALL_COUNT.load(Relaxed), 3);
    let dict = PyDict::new(py);
    dict.set_item(py, "param", 42).unwrap();
    assert!(obj.call(py, NoArgs, Some(&dict)).is_err());
    assert_eq!(CALL_COUNT.load(Relaxed), 3);
}

#[test]
fn one_arg() {
    fn f(_py: Python, i: usize) -> PyResult<usize> {
        Ok(i * 2)
    }

    let gil = Python::acquire_gil();
    let py = gil.python();
    let obj = py_fn!(py, f(i: usize));

    assert!(obj.call(py, NoArgs, None).is_err());
    assert_eq!(obj.call(py, (1,), None).unwrap().extract::<i32>(py).unwrap(), 2);
    assert!(obj.call(py, (1, 2), None).is_err());

    let dict = PyDict::new(py);
    dict.set_item(py, "i", 42).unwrap();
    assert_eq!(obj.call(py, NoArgs, Some(&dict)).unwrap().extract::<i32>(py).unwrap(), 84);
    assert!(obj.call(py, (1,), Some(&dict)).is_err());
    dict.set_item(py, "j", 10).unwrap();
    assert!(obj.call(py, NoArgs, Some(&dict)).is_err());
}

#[test]
fn inline_two_args() {
    let gil = Python::acquire_gil();
    let py = gil.python();
    let obj = py_fn!(py, f(a: i32, b: i32) -> PyResult<i32> {
        drop(py); // avoid unused variable warning
        Ok(a * b)
    });

    assert!(obj.call(py, NoArgs, None).is_err());
    assert_eq!(obj.call(py, (6, 7), None).unwrap().extract::<i32>(py).unwrap(), 42);
}

/* TODO: reimplement flexible sig support
#[test]
fn flexible_sig() {
    fn f(py: Python, args: &PyTuple, kwargs: &PyDict) -> PyResult<usize> {
        Ok(args.len(py) + 100 * kwargs.map_or(0, |kwargs| kwargs.len(py)))
    }

    let gil = Python::acquire_gil();
    let py = gil.python();
    let obj = py_fn!(f(*args, **kwargs)).to_py_object(py);

    assert_eq!(obj.call(py, NoArgs, None).unwrap().extract::<i32>(py).unwrap(), 0);
    assert_eq!(obj.call(py, (1,), None).unwrap().extract::<i32>(py).unwrap(), 1);
    assert_eq!(obj.call(py, (1,2), None).unwrap().extract::<i32>(py).unwrap(), 2);

    let dict = PyDict::new(py);
    dict.set_item(py, "i", 42).unwrap();
    assert_eq!(obj.call(py, NoArgs, Some(&dict)).unwrap().extract::<i32>(py).unwrap(), 100);
    assert_eq!(obj.call(py, (1,2), Some(&dict)).unwrap().extract::<i32>(py).unwrap(), 102);
    dict.set_item(py, "j", 10).unwrap();
    assert_eq!(obj.call(py, (1,2,3), Some(&dict)).unwrap().extract::<i32>(py).unwrap(), 203);
}
*/