Mercurial > public > mercurial-scm > hg-stable
diff rust/hg-cpython/src/lib.rs @ 40978:5532823e8c18
rust-cpython: start cpython crate bindings
This changeset introduces the hg-cpython crate,
that compiles as a shared library holding a whole
Python package (mercurial.rustext), with only the empty
'ancestor' submodule for now.
Such bindings will be easier and safer to develop and maintain
that those of `hg-direct-ffi`.
They don't involve C code, only unsafe Rust that's mostly isolated
within the cpython crate.
The long-term goal would be to import the provided modules, such
as rustext.ancestor with mercurial.policy.importmod, same as
we already do with cext modules.
Differential Revision: https://phab.mercurial-scm.org/D5434
| author | Georges Racinet <gracinet@anybox.fr> |
|---|---|
| date | Mon, 03 Dec 2018 06:52:17 +0100 |
| parents | |
| children | 4c25038c112c |
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--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/rust/hg-cpython/src/lib.rs Mon Dec 03 06:52:17 2018 +0100 @@ -0,0 +1,40 @@ +// lib.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. + +//! Python bindings of `hg-core` objects using the `cpython` crate. +//! Once compiled, the resulting single shared library object can be placed in +//! the `mercurial` package directly as `rustext.so` or `rustext.dll`. +//! It holds several modules, so that from the point of view of Python, +//! it behaves as the `cext` package. +//! +//! Example: +//! ``` +//! >>> from mercurial.rustext import ancestor +//! >>> ancestor.__doc__ +//! 'Generic DAG ancestor algorithms - Rust implementation' +//! ``` + +#[macro_use] +extern crate cpython; +extern crate hg; + +mod ancestors; +mod exceptions; + +py_module_initializer!(rustext, initrustext, PyInit_rustext, |py, m| { + m.add( + py, + "__doc__", + "Mercurial core concepts - Rust implementation", + )?; + + let dotted_name: String = m.get(py, "__name__")?.extract(py)?; + m.add(py, "__package__", "mercurial")?; + m.add(py, "ancestor", ancestors::init_module(py, &dotted_name)?)?; + m.add(py, "GraphError", py.get_type::<exceptions::GraphError>())?; + Ok(()) +});