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# Copyright 2015 Benjamin Barenblat. 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 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.
def _change_extension(path, new_extension):
# TODO(bbarenblat): Don’t hard-code "/" as the path separator.
basename_start = path.rfind("/")
if basename_start == -1:
basename_start = 0
extension_start = path.rfind(".", basename_start)
if extension_start == -1:
# No extension, so add one.
return path + "." + new_extension
else:
return path[:extension_start] + "." + new_extension
def _ocaml_interface_impl(ctx):
# ocamlopt completely ignores the -o option if you’re compiling OCaml. (It
# works correctly if you’re compiling C using ocamlopt as a driver.) As a
# workaround, compute the path to the file ocamlopt will generate and then
# move it into its final (Bazel-approved) location.
input_file_path = ctx.files.src[0].path
generated_interface_path = _change_extension(input_file_path, "cmi")
cmd = (
"set -e;" +
"ocamlopt" +
" -intf " + input_file_path + ";" +
"mv " + generated_interface_path +
" " + ctx.outputs.compiled_interface.path
)
ctx.action(
inputs=[],
outputs=[ctx.outputs.compiled_interface],
progress_message="Compiling OCaml interface %s" % ctx.label.name,
command=cmd,
)
ocaml_interface = rule(
implementation=_ocaml_interface_impl,
attrs={
"src": attr.label(allow_files=True, mandatory=True, single_file=True)
},
outputs={"compiled_interface": "%{src}.cmi"},
)
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