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// Copyright 2014 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.
package com.google.devtools.build.lib.bazel.rules.common;
import static com.google.devtools.build.lib.packages.Attribute.ConfigurationTransition.DATA;
import static com.google.devtools.build.lib.packages.Attribute.attr;
import static com.google.devtools.build.lib.packages.BuildType.LABEL_LIST;
import static com.google.devtools.build.lib.packages.BuildType.LICENSE;
import static com.google.devtools.build.lib.syntax.Type.STRING;
import com.google.devtools.build.lib.analysis.BaseRuleClasses;
import com.google.devtools.build.lib.analysis.RuleDefinition;
import com.google.devtools.build.lib.analysis.RuleDefinitionEnvironment;
import com.google.devtools.build.lib.packages.RuleClass;
import com.google.devtools.build.lib.packages.RuleClass.Builder;
import com.google.devtools.build.lib.rules.filegroup.Filegroup;
import com.google.devtools.build.lib.util.FileTypeSet;
/**
* Rule object implementing "filegroup".
*/
public final class BazelFilegroupRule implements RuleDefinition {
@Override
public RuleClass build(Builder builder, RuleDefinitionEnvironment env) {
// filegroup ignores any filtering set with setSrcsAllowedFiles.
return builder
/*<!-- #BLAZE_RULE(filegroup).ATTRIBUTE(srcs) -->
The list of targets that are members of the file group.
${SYNOPSIS}
<p>
It is common to use the result of a <a href="#glob">glob</a> expression for the value
of the <code>srcs</code> attribute. If a rule and a source file with the same name both
exist in the package, the glob will return the outputs of the rule instead of the source
file.
</p>
<!-- #END_BLAZE_RULE.ATTRIBUTE -->*/
.add(attr("srcs", LABEL_LIST).allowedFileTypes(FileTypeSet.ANY_FILE))
/*<!-- #BLAZE_RULE(filegroup).ATTRIBUTE(data) -->
The list of files needed by this rule at runtime.
${SYNOPSIS}
<p>
Targets named in the <code>data</code> attribute will be added to the
<code>runfiles</code> of this <code>filegroup</code> rule. When the
<code>filegroup</code> is referenced in the <code>data</code> attribute of
another rule its <code>runfiles</code> will be added to the <code>runfiles</code>
of the depending rule. See the <a href="build-ref.html#data">data dependencies</a>
section and <a href="#common.data">general documentation of <code>data</code></a>
for more information about how to depend on and use data files.
</p>
<!-- #END_BLAZE_RULE.ATTRIBUTE -->*/
.add(attr("data", LABEL_LIST).cfg(DATA).allowedFileTypes(FileTypeSet.ANY_FILE))
.add(attr("output_licenses", LICENSE))
/*<!-- #BLAZE_RULE(filegroup).ATTRIBUTE(path) -->
An optional string to set a path to the files in the group, relative to the package path.
${SYNOPSIS}
<p>
This attribute can be used internally by other rules depending on this
<code>filegroup</code> to find the name of the directory holding the files.
</p>
<!-- #END_BLAZE_RULE.ATTRIBUTE -->*/
.add(attr("path", STRING))
.build();
}
@Override
public Metadata getMetadata() {
return RuleDefinition.Metadata.builder()
.name("filegroup")
.ancestors(BaseRuleClasses.BaseRule.class)
.factoryClass(Filegroup.class)
.build();
}
}
/*<!-- #BLAZE_RULE (NAME = filegroup, TYPE = BINARY, FAMILY = General)[GENERIC_RULE] -->
${ATTRIBUTE_SIGNATURE}
<p>
Use <code>filegroup</code> to give a convenient name to a collection of targets.
These can then be referenced from other rules.
</p>
<p>
Using <code>filegroup</code> is encouraged instead of referencing directories directly.
The latter is unsound since the build system does not have full knowledge of all files
below the directory, so it may not rebuild when these files change. When combined with
<a href="#glob">glob</a>, <code>filegroup</code> can ensure that all files are explicitly
known to the build system.
</p>
${ATTRIBUTE_DEFINITION}
<h4 id="filegroup_example">Examples</h4>
<p>
To create a <code>filegroup</code> consisting of two source files, do
</p>
<pre class="code">
filegroup(
name = "mygroup",
srcs = [
"a_file.txt",
"some/subdirectory/another_file.txt",
],
)
</pre>
<p>
Or, use a <code>glob</code> to grovel a testdata directory:
</p>
<pre class="code">
filegroup(
name = "exported_testdata",
srcs = glob([
"testdata/*.dat",
"testdata/logs/**/*.log",
]),
)
</pre>
<p>
To make use of these definitions, reference the <code>filegroup</code> with a label from any rule:
</p>
<pre class="code">
cc_library(
name = "my_library",
srcs = ["foo.cc"],
data = [
"//my_package:exported_testdata",
"//my_package:mygroup",
],
)
</pre>
<!-- #END_BLAZE_RULE -->*/
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