view rust/hg-cpython/src/exceptions.rs @ 48788:f90337706ce7

filemerge: make `_maketempfiles()` more reusable

`_maketempfiles()` is very specialized for its current use. I hope to
use it also when creating temporary files for input for tools that do
partial conflict resolution. That'll be possible if the function is
more generic. Instead of passing in two contexts (for "other" and
"base") and an optional path (for "local"), let's pass a single list
of files to make backups for. Even if we don't end up using for
partial conflict resolution, this is still a simplification (but I do
have a WIP patch for partial conflict resolution and it is able to
benefit from this).

Differential Revision: https://phab.mercurial-scm.org/D12193

// ancestors.rs
//
// Copyright 2018 Georges Racinet <[e-mail]>
//
// 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))
            }
            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),
                }
            }
        }
    }

    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);