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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.facet;

import com.intellij.ide.highlighter.ArchiveFileType;
import com.intellij.openapi.application.ApplicationManager;
import com.intellij.openapi.module.Module;
import com.intellij.openapi.project.Project;
import com.intellij.openapi.roots.*;
import com.intellij.openapi.roots.impl.OrderEntryUtil;
import com.intellij.openapi.roots.impl.libraries.LibraryImpl;
import com.intellij.openapi.roots.impl.libraries.LibraryTableBase;
import com.intellij.openapi.roots.impl.libraries.ProjectLibraryTable;
import com.intellij.openapi.roots.libraries.Library;
import com.intellij.openapi.vfs.JarFileSystem;
import com.intellij.openapi.vfs.LocalFileSystem;
import com.intellij.openapi.vfs.VirtualFile;
import com.jetbrains.python.library.PythonLibraryType;
import org.jetbrains.annotations.Nullable;

import java.util.Collections;
import java.util.HashSet;
import java.util.List;
import java.util.Set;

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

  public static void attachPythonLibrary(final Module module,
                                         @Nullable final ModifiableRootModel existingModel,
                                         final String libraryName,
                                         final List paths) {
    final ModifiableModelsProvider modelsProvider = ModifiableModelsProvider.SERVICE.getInstance();
    ApplicationManager.getApplication().runWriteAction(new Runnable() {
      public void run() {
        // add all paths to library
        final ModifiableRootModel model = existingModel != null ? existingModel : modelsProvider.getModuleModifiableModel(module);
        final LibraryOrderEntry orderEntry = OrderEntryUtil.findLibraryOrderEntry(model, libraryName);
        if (orderEntry != null) {
          // update existing
          Library lib = orderEntry.getLibrary();
          if (lib != null) {
            if (lib instanceof LibraryImpl && ((LibraryImpl)lib).getKind() == null) {   // replace old python libraries with python specific ones
              model.removeOrderEntry(orderEntry);
              ProjectLibraryTable.getInstance(model.getProject()).removeLibrary(lib);
              createNewLibrary(model);
              return;
            }
            fillLibrary(module.getProject(), lib, paths);
            if (existingModel == null) {
              modelsProvider.commitModuleModifiableModel(model);
            }
            return;
          }
        }
        // create new
        createNewLibrary(model);
      }

      private void createNewLibrary(ModifiableRootModel model) {
        final LibraryTableBase.ModifiableModelEx projectLibrariesModel =
          (LibraryTableBase.ModifiableModelEx)modelsProvider.getLibraryTableModifiableModel(model.getProject());
        Library lib = projectLibrariesModel.createLibrary(libraryName, PythonLibraryType.getInstance().getKind());
        fillLibrary(module.getProject(), lib, paths);
        projectLibrariesModel.commit();
        model.addLibraryEntry(lib);
        if (existingModel == null) {
          modelsProvider.commitModuleModifiableModel(model);
        }
      }
    });
  }

  private static void fillLibrary(Project project, Library lib, List paths) {
    Library.ModifiableModel modifiableModel = lib.getModifiableModel();
    for (String root : lib.getUrls(OrderRootType.CLASSES)) {
      modifiableModel.removeRoot(root, OrderRootType.CLASSES);
    }
    Set roots = new HashSet();
    ProjectRootManager rootManager = ProjectRootManager.getInstance(project);
    Collections.addAll(roots, rootManager.getContentRoots());
    Collections.addAll(roots, rootManager.getContentSourceRoots());
    if (paths != null) {
      for (String dir : paths) {
        VirtualFile pathEntry = LocalFileSystem.getInstance().findFileByPath(dir);
        if (pathEntry != null && !pathEntry.isDirectory() && pathEntry.getFileType() instanceof ArchiveFileType) {
          pathEntry = JarFileSystem.getInstance().getJarRootForLocalFile(pathEntry);
        }
        // buildout includes source root of project in paths; don't add it as library home
        if (pathEntry != null && roots.contains(pathEntry)) {
          continue;
        }
        if (pathEntry != null) {
          modifiableModel.addRoot(pathEntry, OrderRootType.CLASSES);
        }
        else {
          modifiableModel.addRoot("file://"+dir, OrderRootType.CLASSES);
        }
      }
    }
    modifiableModel.commit();
  }

  public static void detachPythonLibrary(final Module module, final String libraryName) {
    final ModifiableModelsProvider modelsProvider = ModifiableModelsProvider.SERVICE.getInstance();
    ApplicationManager.getApplication().runWriteAction(new Runnable() {
      public void run() {
        // remove the library
        final ModifiableRootModel model = modelsProvider.getModuleModifiableModel(module);
        OrderEntry entry = OrderEntryUtil.findLibraryOrderEntry(model, libraryName);
        if (entry == null) {
          modelsProvider.disposeModuleModifiableModel(model);
        }
        else {
          model.removeOrderEntry(entry);
          modelsProvider.commitModuleModifiableModel(model);
        }
      }
    });
  }
}