platform/platform-impl/src/com/intellij/openapi/application/PluginPathManager.java

/*
 * Copyright 2000-2009 JetBrains s.r.o.
 *
 * 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.intellij.openapi.application;

import com.intellij.openapi.util.io.FileUtil;
import org.jetbrains.annotations.NotNull;

import java.io.File;
import java.io.FileFilter;
import java.util.*;

/**
 * @author yole
 */
public class PluginPathManager {
  private PluginPathManager() {
  }

  private static class SubrepoHolder {
    public static List<File> subrepos = findSubrepos();

    private static List<File> findSubrepos() {
      List<File> result = new ArrayList<File>();
      File[] gitRoots = getSortedGitRoots(new File(PathManager.getHomePath()));
      for (File subdir : gitRoots) {
        File pluginsDir = new File(subdir, "plugins");
        if (pluginsDir.exists()) {
          result.add(pluginsDir);
        }
        else {
          result.add(subdir);
        }
        result.addAll(Arrays.asList(getSortedGitRoots(subdir)));
      }
      return result;
    }

    @NotNull
    private static File[] getSortedGitRoots(@NotNull File dir) {
      File[] gitRoots = dir.listFiles(new FileFilter() {
        @Override
        public boolean accept(File child) {
          return child.isDirectory() && new File(child, ".git").exists();
        }
      });
      if (gitRoots == null) {
        return new File[0];
      }
      Arrays.sort(gitRoots, new Comparator<File>() {
        @Override
        public int compare(File file, File file2) {
          return FileUtil.compareFiles(file, file2);
        }
      });
      return gitRoots;
    }
  }

  public static File getPluginHome(String pluginName) {
    File subrepo = findSubrepo(pluginName);
    if (subrepo != null) {
      return subrepo;
    }
    return new File(PathManager.getHomePath(), "plugins/" + pluginName);
  }

  private static File findSubrepo(String pluginName) {
    for (File subrepo : SubrepoHolder.subrepos) {
      File candidate = new File(subrepo, pluginName);
      if (candidate.isDirectory()) {
        return candidate;
      }
    }
    return null;
  }

  public static String getPluginHomePath(String pluginName) {
    return getPluginHome(pluginName).getPath();
  }

  public static String getPluginHomePathRelative(String pluginName) {
    File subrepo = findSubrepo(pluginName);
    if (subrepo != null) {
      String homePath = FileUtil.toSystemIndependentName(PathManager.getHomePath());
      return "/" + FileUtil.getRelativePath(homePath, FileUtil.toSystemIndependentName(subrepo.getPath()), '/');
    }
    return "/plugins/" + pluginName;
  }
}