Materialize/misc/bazel/rules/rust_cxx_bridge.bzl

# Copyright Materialize, Inc. and contributors. All rights reserved.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License in the LICENSE file at the
# root of this repository, or online at
#
#     http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.

load("@bazel_skylib//rules:run_binary.bzl", "run_binary")
load("@rules_cc//cc:defs.bzl", "cc_library")

"""
Ripped from the `cxx` repository.

<https://github.com/dtolnay/cxx/blob/ea34e6350c7ff6528e9aebec1be7918dd2a2b608/tools/bazel/rust_cxx_bridge.bzl>

Please see the end of the file for the license.
"""

def rust_cxx_bridge(name, src, deps = [], headers_prefix = ""):
    """A macro defining a cxx bridge library

    Args:
        name (string): The name of the new target
        src (string): The rust source file to generate a bridge for
        deps (list, optional): A list of dependencies for the underlying cc_library. Defaults to [].
        headers_prefix (string, optional): An `include_prefix` for the generated headers.
    """
    native.alias(
        name = "%s/header" % name,
        actual = src + ".h",
    )

    native.alias(
        name = "%s/source" % name,
        actual = src + ".cc",
    )

    run_binary(
        name = "%s/generated" % name,
        srcs = [src],
        outs = [
            src + ".h",
            src + ".cc",
        ],
        args = [
            "$(location %s)" % src,
            "-o",
            "$(location %s.h)" % src,
            "-o",
            "$(location %s.cc)" % src,
        ],
        tool = "@cxxbridge-cmd//:cxxbridge-cmd",
    )

    cc_library(
        name = name,
        srcs = [src + ".cc"],
        deps = deps + [":%s/include" % name],
    )

    cc_library(
        name = "%s/include" % name,
        hdrs = [src + ".h"],
        include_prefix = headers_prefix,
    )

"""
`cxx/LICENSE-MIT`

Permission is hereby granted, free of charge, to any
person obtaining a copy of this software and associated
documentation files (the "Software"), to deal in the
Software without restriction, including without
limitation the rights to use, copy, modify, merge,
publish, distribute, sublicense, and/or sell copies of
the Software, and to permit persons to whom the Software
is furnished to do so, subject to the following
conditions:

The above copyright notice and this permission notice
shall be included in all copies or substantial portions
of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF
ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED
TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A
PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT
SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR
IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
DEALINGS IN THE SOFTWARE.
"""