java/com/google/devtools/bazel/e4b/preferences/BazelPreferenceInitializer.java

// Copyright 2016 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.bazel.e4b.preferences;

import java.io.File;

import org.eclipse.core.runtime.preferences.AbstractPreferenceInitializer;
import org.eclipse.jface.preference.IPreferenceStore;

import com.google.devtools.bazel.e4b.Activator;

/**
 * Initialize the preferences of Bazel. The only preferences stored for now is the path to the Bazel
 * binary, which is expected to be in /usr/local/bin/bazel by default.
 */
public class BazelPreferenceInitializer extends AbstractPreferenceInitializer {

  private static String which(String name, String def) {
    for (String dirname : System.getenv("PATH").split(File.pathSeparator)) {
      File file = new File(dirname, name);
      if (file.isFile() && file.canExecute()) {
        return file.getAbsolutePath();
      }
    }
    return def;
  }

  @Override
  public void initializeDefaultPreferences() {
    IPreferenceStore store = Activator.getDefault().getPreferenceStore();
    store.setDefault("BAZEL_PATH", which("bazel", "/usr/local/bin/bazel"));
  }

}