// 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::{RuntimeError, ValueError},

    py_exception, 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))

            }

        }

    }

    pub fn pynew_from_vcsgraph(

        py: Python,

        inner: vcsgraph::graph::GraphReadError,

    ) -> PyErr {

        match inner {

            vcsgraph::graph::GraphReadError::InconsistentGraphData => {

                GraphError::new(py, "InconsistentGraphData")

            }

            vcsgraph::graph::GraphReadError::InvalidKey => {

                GraphError::new(py, "ParentOutOfRange")

            }

            vcsgraph::graph::GraphReadError::KeyedInvalidKey(r) => {

                GraphError::new(py, ("ParentOutOfRange", r))

            }

            vcsgraph::graph::GraphReadError::WorkingDirectoryUnsupported => {

                match py

                    .import("mercurial.error")

                    .and_then(|m| m.get(py, "WdirUnsupported"))

                {

                    Err(e) => e,

                    Ok(cls) => PyErr::from_instance(py, cls),

                }

            }

        }

    }

}

py_exception!(rustext, HgPathPyError, RuntimeError);

py_exception!(rustext, FallbackError, RuntimeError);

py_exception!(shared_ref, AlreadyBorrowed, RuntimeError);