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// Copyright 2018 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.packageprinter;
import com.google.common.eventbus.EventBus;
import com.google.devtools.build.lib.events.PrintingEventHandler;
import com.google.devtools.build.lib.events.Reporter;
import com.google.devtools.build.lib.skyframe.packages.BazelPackageLoader;
import com.google.devtools.build.lib.skyframe.packages.PackageLoader;
import com.google.devtools.build.lib.vfs.FileSystem;
import com.google.devtools.build.lib.vfs.JavaIoFileSystem;
import com.google.devtools.build.lib.vfs.Path;
import java.nio.file.Paths;
/**
* PackagePrinter prints the list of rules in a Bazel package.
*
* <p>That is, it prints the names of the rules in a BUILD file after macro expansion.
*/
public class BazelPackagePrinter {
public static void main(String[] args) throws Exception {
if (!verifyArgs(args)) {
System.err.println(
"Usage example: BazelPackagePrinter "
+ "--workspace_root=. "
+ "--install_base=$(bazel info install_base) "
+ "--output_base=$(bazel info output_base) "
+ "package/to/print");
System.exit(1);
}
FileSystem fileSystem = new JavaIoFileSystem();
PackageLoader loader =
newPackageLoader(
fileSystem.getPath(getAbsPathFlag(args[0], "--workspace_root=")),
fileSystem.getPath(getAbsPathFlag(args[1], "--install_base=")),
fileSystem.getPath(getAbsPathFlag(args[2], "--output_base=")));
Lib.printPackageContents(loader, args[3]);
}
/** newPackageLoader returns a new PackageLoader. */
static PackageLoader newPackageLoader(Path workspaceDir, Path installBase, Path outputBase) {
return BazelPackageLoader.builder(workspaceDir, installBase, outputBase)
.useDefaultSkylarkSemantics()
.setReporter(new Reporter(new EventBus(), PrintingEventHandler.ERRORS_TO_STDERR))
.setLegacyGlobbingThreads(400)
.setSkyframeThreads(300)
.build();
}
static boolean verifyArgs(String[] args) {
if (args.length != 4) {
return false;
}
if (!args[0].startsWith("--workspace_root=")) {
return false;
}
if (!args[1].startsWith("--install_base=")) {
return false;
}
if (!args[2].startsWith("--output_base=")) {
return false;
}
return true;
}
static String getAbsPathFlag(String flagName, String arg) {
return Paths.get(flagName.substring(arg.length())).toAbsolutePath().toString();
}
}
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