rust-cpython: raising error.WdirUnsupported
The Graph implementation of hg-cpython returns the appropriate error
upon encounter with the working directory special revision number, and
this gives us in particular a code path to test from test-rust-ancestors.py
In the current implementation, the exception is actually raised from
the iterator instantiation; we are nonetheless consuming the iterator
in the test with `list()` in order not to depend on implementation details.
// ancestors.rs
//
// Copyright 2018 Georges Racinet <gracinet@anybox.fr>
//
// This software may be used and distributed according to the terms of the
// GNU General Public License version 2 or any later version.
//! Bindings for Rust errors
//!
//! [`GraphError`] exposes `hg::GraphError` as a subclass of `ValueError`
//! but some variants of `hg::GraphError` can be converted directly to other
//! existing Python exceptions if appropriate.
//!
//! [`GraphError`]: struct.GraphError.html
use cpython::exc::ValueError;
use cpython::{PyErr, Python};
use hg;
py_exception!(rustext, GraphError, ValueError);
impl GraphError {
pub fn pynew(py: Python, inner: hg::GraphError) -> PyErr {
match inner {
hg::GraphError::ParentOutOfRange(r) => {
GraphError::new(py, ("ParentOutOfRange", r))
}
hg::GraphError::WorkingDirectoryUnsupported => {
match py
.import("mercurial.error")
.and_then(|m| m.get(py, "WdirUnsupported"))
{
Err(e) => e,
Ok(cls) => PyErr::from_instance(py, cls),
}
}
}
}
}