com.google.devtools.build.lib.skylark.util.SkylarkUtil.java Source code

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Here is the source code for com.google.devtools.build.lib.skylark.util.SkylarkUtil.java

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// Copyright 2015 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.skylark.util;

import com.google.common.io.Files;
import com.google.devtools.build.lib.testutil.Scratch;
import com.google.devtools.build.lib.vfs.Path;

import java.io.File;
import java.io.IOException;
import java.nio.charset.Charset;

/**
 * Utility class to perform Skylark-related setup.
 */
public class SkylarkUtil {
    public static void setup(Scratch scratch) throws IOException {
        scratch.file("tools/build_rules/BUILD");
        scratch.file("rules/BUILD");
        copyExistingSkylarkFiles(scratch, "tools/build_rules", "rules");
        copyExistingSkylarkFiles(scratch, "third_party/bazel/tools/build_rules", "rules");
    }

    private static void copyExistingSkylarkFiles(Scratch scratch, String from, String to) throws IOException {
        File rulesDir = new File(from);
        if (rulesDir.exists() && rulesDir.isDirectory()) {
            for (String fileName : rulesDir.list()) {
                File file = new File(from + "/" + fileName);
                if (file.isFile() && fileName.endsWith(".bzl")) {
                    String context = Files.toString(file, Charset.defaultCharset());
                    Path path = scratch.resolve(to + "/" + fileName);
                    if (path.exists()) {
                        scratch.overwriteFile(path.getPathString(), context);
                    } else {
                        scratch.file(path.getPathString(), context);
                    }
                }
            }
        }
    }
}