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A packaging of the IntelliJ Community Edition platform-impl library. This is release number 1 of trunk branch 142.
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/*
 * Copyright 2000-2013 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.vfs.encoding;

import com.intellij.openapi.actionSystem.*;
import com.intellij.openapi.application.Application;
import com.intellij.openapi.application.ApplicationManager;
import com.intellij.openapi.application.ModalityState;
import com.intellij.openapi.command.CommandProcessor;
import com.intellij.openapi.command.UndoConfirmationPolicy;
import com.intellij.openapi.command.undo.GlobalUndoableAction;
import com.intellij.openapi.command.undo.UndoManager;
import com.intellij.openapi.command.undo.UndoableAction;
import com.intellij.openapi.editor.Document;
import com.intellij.openapi.editor.Editor;
import com.intellij.openapi.fileEditor.FileDocumentManager;
import com.intellij.openapi.project.DumbAware;
import com.intellij.openapi.project.Project;
import com.intellij.openapi.project.ProjectLocator;
import com.intellij.openapi.ui.popup.JBPopupFactory;
import com.intellij.openapi.ui.popup.ListPopup;
import com.intellij.openapi.vfs.VirtualFile;
import com.intellij.util.Function;
import org.jetbrains.annotations.NotNull;
import org.jetbrains.annotations.Nullable;

import javax.swing.*;
import java.io.IOException;
import java.nio.charset.Charset;

/**
 * @author cdr
*/
public class ChangeFileEncodingAction extends AnAction implements DumbAware {
  private final boolean allowDirectories;

  public ChangeFileEncodingAction() {
    this(false);
  }

  public ChangeFileEncodingAction(boolean allowDirectories) {
    this.allowDirectories = allowDirectories;
  }

  private boolean checkEnabled(@NotNull VirtualFile virtualFile) {
    if (allowDirectories && virtualFile.isDirectory()) return true;
    FileDocumentManager documentManager = FileDocumentManager.getInstance();
    Document document = documentManager.getDocument(virtualFile);
    if (document == null) return false;

    return EncodingUtil.checkCanConvert(virtualFile) == null || EncodingUtil.checkCanReload(virtualFile).second == null;
  }

  @Override
  public void update(AnActionEvent e) {
    VirtualFile myFile = e.getData(CommonDataKeys.VIRTUAL_FILE);
    boolean enabled = myFile != null && checkEnabled(myFile);
    e.getPresentation().setEnabled(enabled);
    e.getPresentation().setVisible(myFile != null);
  }

  @Override
  public final void actionPerformed(final AnActionEvent e) {
    DataContext dataContext = e.getDataContext();

    ListPopup popup = createPopup(dataContext);
    if (popup != null) {
      popup.showInBestPositionFor(dataContext);
    }
  }

  @Nullable
  public ListPopup createPopup(@NotNull DataContext dataContext) {
    final VirtualFile virtualFile = CommonDataKeys.VIRTUAL_FILE.getData(dataContext);
    if (virtualFile == null) return null;
    boolean enabled = checkEnabled(virtualFile);
    if (!enabled) return null;
    Editor editor = CommonDataKeys.EDITOR.getData(dataContext);
    FileDocumentManager documentManager = FileDocumentManager.getInstance();
    final Document document = documentManager.getDocument(virtualFile);
    if (!allowDirectories && virtualFile.isDirectory() || document == null && !virtualFile.isDirectory()) return null;

    final byte[] bytes;
    try {
      bytes = virtualFile.isDirectory() ? null : virtualFile.contentsToByteArray();
    }
    catch (IOException e) {
      return null;
    }
    DefaultActionGroup group = createActionGroup(virtualFile, editor, document, bytes, null);

    return JBPopupFactory.getInstance().createActionGroupPopup(getTemplatePresentation().getText(),
      group, dataContext, JBPopupFactory.ActionSelectionAid.SPEEDSEARCH, false);
  }

  public DefaultActionGroup createActionGroup(@NotNull final VirtualFile myFile,
                                              final Editor editor,
                                              final Document document,
                                              final byte[] bytes,
                                              @Nullable final String clearItemText) {
    final String text = document == null ? null : document.getText();

    return new ChooseFileEncodingAction(myFile) {
     @Override
     public void update(final AnActionEvent e) {
     }

     @NotNull
     @Override
     protected DefaultActionGroup createPopupActionGroup(JComponent button) {
       return createCharsetsActionGroup(clearItemText, null, new Function() {
         @Override
         public String fun(Charset charset) {
           assert myFile.isDirectory() || text != null : charset;
           EncodingUtil.Magic8 safeToReload = myFile.isDirectory() ? EncodingUtil.Magic8.ABSOLUTELY : EncodingUtil.isSafeToReloadIn(myFile, text, bytes, charset);
           boolean enabled = safeToReload != EncodingUtil.Magic8.NO_WAY;
           if (!enabled) {
             EncodingUtil.Magic8 safeToConvert = myFile.isDirectory() ? EncodingUtil.Magic8.ABSOLUTELY : EncodingUtil.isSafeToConvertTo(myFile, text, bytes, charset);
             enabled = safeToConvert != EncodingUtil.Magic8.NO_WAY;
           }
           return enabled ? "Change encoding to '"+charset.displayName()+"'" : null;
         }
       }); // no 'clear'
     }

     @Override
     protected void chosen(@Nullable VirtualFile virtualFile, @NotNull Charset charset) {
       if (virtualFile != null) {
         ChangeFileEncodingAction.this.chosen(document, editor, virtualFile, bytes, charset);
       }
     }
   }
   .createPopupActionGroup(null);
  }

  // returns true if charset was changed, false if failed
  protected boolean chosen(final Document document,
                           final Editor editor,
                           @NotNull final VirtualFile virtualFile,
                           byte[] bytes,
                           @NotNull final Charset charset) {

    String text = document.getText();
    EncodingUtil.Magic8 isSafeToConvert = EncodingUtil.isSafeToConvertTo(virtualFile, text, bytes, charset);
    EncodingUtil.Magic8 isSafeToReload = EncodingUtil.isSafeToReloadIn(virtualFile, text, bytes, charset);

    final Project project = ProjectLocator.getInstance().guessProjectForFile(virtualFile);
    final Charset oldCharset = virtualFile.getCharset();
    final Runnable undo;
    final Runnable redo;

    if (isSafeToConvert == EncodingUtil.Magic8.ABSOLUTELY && isSafeToReload == EncodingUtil.Magic8.ABSOLUTELY) {
      //change and forget
      undo = new Runnable() {
        @Override
        public void run() {
          EncodingManager.getInstance().setEncoding(virtualFile, oldCharset);
        }
      };
      redo = new Runnable() {
        @Override
        public void run() {
          EncodingManager.getInstance().setEncoding(virtualFile, charset);
        }
      };
    }
    else {
      IncompatibleEncodingDialog dialog = new IncompatibleEncodingDialog(virtualFile, charset, isSafeToReload, isSafeToConvert);
      dialog.show();
      if (dialog.getExitCode() == IncompatibleEncodingDialog.RELOAD_EXIT_CODE) {
        undo = new Runnable() {
          @Override
          public void run() {
            EncodingUtil.reloadIn(virtualFile, oldCharset);
          }
        };
        redo = new Runnable() {
          @Override
          public void run() {
            EncodingUtil.reloadIn(virtualFile, charset);
          }
        };
      }
      else if (dialog.getExitCode() == IncompatibleEncodingDialog.CONVERT_EXIT_CODE) {
        undo = new Runnable() {
          @Override
          public void run() {
            EncodingUtil.saveIn(document, editor, virtualFile, oldCharset);
          }
        };
        redo = new Runnable() {
          @Override
          public void run() {
            EncodingUtil.saveIn(document, editor, virtualFile, charset);
          }
        };
      }
      else {
        return false;
      }
    }

    final UndoableAction action = new GlobalUndoableAction(virtualFile) {
      @Override
      public void undo() {
        // invoke later because changing document inside undo/redo is not allowed
        Application application = ApplicationManager.getApplication();
        application.invokeLater(undo, ModalityState.NON_MODAL, (project == null ? application : project).getDisposed());
      }

      @Override
      public void redo() {
        // invoke later because changing document inside undo/redo is not allowed
        Application application = ApplicationManager.getApplication();
        application.invokeLater(redo, ModalityState.NON_MODAL, (project == null ? application : project).getDisposed());
      }
    };

    redo.run();
    CommandProcessor.getInstance().executeCommand(project, new Runnable() {
      @Override
      public void run() {
        UndoManager undoManager = project == null ? UndoManager.getGlobalInstance() : UndoManager.getInstance(project);
        undoManager.undoableActionPerformed(action);
      }
    }, "Change encoding for '" + virtualFile.getName() + "'", null, UndoConfirmationPolicy.REQUEST_CONFIRMATION);

    return true;
  }
}