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A packaging of the IntelliJ Community Edition python-community library. This is release number 1 of trunk branch 142.

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/*
 * Copyright 2000-2014 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.jetbrains.python;

import com.intellij.ide.IconProvider;
import com.intellij.openapi.module.Module;
import com.intellij.openapi.module.ModuleUtilCore;
import com.intellij.openapi.roots.FileIndexFacade;
import com.intellij.openapi.vfs.VirtualFile;
import com.intellij.psi.PsiDirectory;
import com.intellij.psi.PsiElement;
import com.intellij.util.PlatformIcons;
import com.jetbrains.python.psi.PyUtil;
import org.jetbrains.annotations.NotNull;

import javax.swing.*;
import java.util.Collection;

/**
 * @author yole
 */
public class PyDirectoryIconProvider extends IconProvider {
  @Override
  public Icon getIcon(@NotNull PsiElement element, int flags) {
    if (element instanceof PsiDirectory) {
      final PsiDirectory directory = (PsiDirectory)element;
      // Preserve original icons for excluded directories and source roots
      if (!isSpecialDirectory(directory) && isImportablePackage(directory)) {
        return PlatformIcons.PACKAGE_ICON;
      }
    }
    return null;
  }

  private static boolean isSpecialDirectory(@NotNull PsiDirectory directory) {
    final VirtualFile vFile = directory.getVirtualFile();
    if (FileIndexFacade.getInstance(directory.getProject()).isExcludedFile(vFile)) {
      return true;
    }
    final Module module = ModuleUtilCore.findModuleForPsiElement(directory);
    return module == null || PyUtil.getSourceRoots(module).contains(vFile);
  }

  private static boolean isImportablePackage(@NotNull PsiDirectory directory) {
    final Collection sourceRoots = PyUtil.getSourceRoots(directory);
    for (PsiDirectory dir = directory; dir != null; dir = dir.getParentDirectory()) {
      if (sourceRoots.contains(dir.getVirtualFile())) {
        return true;
      }
      if (!PyNames.isIdentifier(dir.getName()) || !PyUtil.isPackage(dir, false, null)) {
        return false;
      }
    }
    return false;
  }
}