108 lines
3.0 KiB
Python
108 lines
3.0 KiB
Python
# Copyright 2017 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.
|
|
|
|
"""Skylib module containing a library rule for aggregating rules files."""
|
|
|
|
StarlarkLibraryInfo = provider(
|
|
"Information on contained Starlark rules.",
|
|
fields = {
|
|
"srcs": "Top level rules files.",
|
|
"transitive_srcs": "Transitive closure of rules files required for " +
|
|
"interpretation of the srcs",
|
|
},
|
|
)
|
|
|
|
def _bzl_library_impl(ctx):
|
|
deps_files = [x.files for x in ctx.attr.deps]
|
|
all_files = depset(ctx.files.srcs, order = "postorder", transitive = deps_files)
|
|
return [
|
|
# All dependent files should be listed in both `files` and in `runfiles`;
|
|
# this ensures that a `bzl_library` can be referenced as `data` from
|
|
# a separate program, or from `tools` of a genrule().
|
|
DefaultInfo(
|
|
files = all_files,
|
|
runfiles = ctx.runfiles(transitive_files = all_files),
|
|
),
|
|
|
|
# We also define our own provider struct, for aggregation and testing.
|
|
StarlarkLibraryInfo(
|
|
srcs = ctx.files.srcs,
|
|
transitive_srcs = all_files,
|
|
),
|
|
]
|
|
|
|
bzl_library = rule(
|
|
implementation = _bzl_library_impl,
|
|
attrs = {
|
|
"srcs": attr.label_list(
|
|
allow_files = [".bzl", ".scl"],
|
|
doc = "List of `.bzl` and `.scl` files that are processed to create this target.",
|
|
),
|
|
"deps": attr.label_list(
|
|
allow_files = [".bzl", ".scl"],
|
|
providers = [
|
|
[StarlarkLibraryInfo],
|
|
],
|
|
doc = """List of other `bzl_library` targets that are required by the
|
|
Starlark files listed in `srcs`.""",
|
|
),
|
|
},
|
|
doc = """Creates a logical collection of Starlark .bzl and .scl files.
|
|
|
|
Example:
|
|
Suppose your project has the following structure:
|
|
|
|
```
|
|
[workspace]/
|
|
WORKSPACE
|
|
BUILD
|
|
checkstyle/
|
|
BUILD
|
|
checkstyle.bzl
|
|
lua/
|
|
BUILD
|
|
lua.bzl
|
|
luarocks.bzl
|
|
```
|
|
|
|
In this case, you can have `bzl_library` targets in `checkstyle/BUILD` and
|
|
`lua/BUILD`:
|
|
|
|
`checkstyle/BUILD`:
|
|
|
|
```python
|
|
load("@bazel_skylib//:bzl_library.bzl", "bzl_library")
|
|
|
|
bzl_library(
|
|
name = "checkstyle-rules",
|
|
srcs = ["checkstyle.bzl"],
|
|
)
|
|
```
|
|
|
|
`lua/BUILD`:
|
|
|
|
```python
|
|
load("@bazel_skylib//:bzl_library.bzl", "bzl_library")
|
|
|
|
bzl_library(
|
|
name = "lua-rules",
|
|
srcs = [
|
|
"lua.bzl",
|
|
"luarocks.bzl",
|
|
],
|
|
)
|
|
```
|
|
""",
|
|
)
|