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bazel-skylib/rules/write_file.bzl
László Csomor 2d1669ed88
write_file: add rule and tests (#122)
This PR adds two new rules: write_file and
write_xfile.

Both rules solve a common problem: to write a text
file with user-defined contents.

The problem is routinely solved using a genrule.
That however requires Bash, since genrules execute
Bash commands.  Requiring Bash is a problem on
Windows.

The new rules do not require any shell.

The only difference between the rules is that
write_xfile creates an executable file while
write_file doesn't.

See https://github.com/bazelbuild/bazel/issues/4319
2019-03-19 07:52:56 +01:00

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# Copyright 2019 The Bazel Authors. 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.
"""A rule that writes a UTF-8 encoded text file from user-specified contents.
native.genrule() is sometimes used to create a text file. The 'write_file' and
macro does this with a simpler interface than genrule.
The rules generated by the macro do not use Bash or any other shell to write the
file. Instead they use Starlark's built-in file writing action
(ctx.actions.write).
"""
load(
":write_file_private.bzl",
_write_file = "write_file",
)
write_file = _write_file