1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
|
# 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"],
doc = "List of `.bzl` files that are processed to create this target.",
),
"deps": attr.label_list(
allow_files = [".bzl"],
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 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",
],
)
```
""",
)
|
