org.eclipse.egit.ui/src/org/eclipse/egit/ui/internal/actions/CompareWithHeadAction.java

   1 /*******************************************************************************
   2  * Copyright (C) 2009, Stefan Lay <stefan.lay@sap.com>
   3  *
   4  * All rights reserved. This program and the accompanying materials
   5  * are made available under the terms of the Eclipse Public License v1.0
   6  * which accompanies this distribution, and is available at
   7  * http://www.eclipse.org/legal/epl-v10.html
   8  *******************************************************************************/
   9 package org.eclipse.egit.ui.internal.actions;
  10
  11 import java.io.IOException;
  12 import java.lang.reflect.InvocationTargetException;
  13
  14 import org.eclipse.compare.CompareUI;
  15 import org.eclipse.compare.ITypedElement;
  16 import org.eclipse.core.resources.IFile;
  17 import org.eclipse.core.resources.IResource;
  18 import org.eclipse.egit.core.project.RepositoryMapping;
  19 import org.eclipse.egit.ui.internal.CompareUtils;
  20 import org.eclipse.egit.ui.internal.GitCompareFileRevisionEditorInput;
  21 import org.eclipse.jface.action.IAction;
  22 import org.eclipse.jgit.lib.Constants;
  23 import org.eclipse.jgit.lib.Ref;
  24 import org.eclipse.jgit.lib.Repository;
  25 import org.eclipse.jgit.revwalk.RevCommit;
  26 import org.eclipse.jgit.revwalk.RevWalk;
  27 import org.eclipse.team.ui.synchronize.SaveableCompareEditorInput;
  28
  29 /**
  30  * Compares the working tree content of a file with the version of the file
  31  * in the HEAD commit.
  32  */
  33 public class CompareWithHeadAction extends RepositoryAction {
  34
  35         public void execute(IAction action) throws InvocationTargetException {
  36                 final IResource resource = getSelectedResources()[0];
  37                 final RepositoryMapping mapping = RepositoryMapping.getMapping(resource.getProject());
  38                 final Repository repository = mapping.getRepository();
  39                 final String gitPath = mapping.getRepoRelativePath(resource);
  40
  41
  42                 final IFile baseFile = (IFile) resource;
  43                 final ITypedElement base = SaveableCompareEditorInput.createFileElement(baseFile);
  44
  45                 ITypedElement next;
  46                 try {
  47                         Ref head = repository.getRef(Constants.HEAD);
  48                         RevWalk rw = new RevWalk(repository);
  49                         RevCommit commit = rw.parseCommit(head.getObjectId());
  50
  51                         next = CompareUtils.getFileRevisionTypedElement(gitPath, commit,
  52                                         repository);
  53                 } catch (IOException e) {
  54                         // this exception is handled by TeamAction.run
  55                         throw new InvocationTargetException(e);
  56                 }
  57
  58
  59                 final GitCompareFileRevisionEditorInput in = new GitCompareFileRevisionEditorInput(
  60                                 base, next, null);
  61                 CompareUI.openCompareEditor(in);
  62         }
  63
  64         @Override
  65         public boolean isEnabled() {
  66                 final IResource[] selectedResources = getSelectedResources();
  67                 if (selectedResources.length != 1)
  68                         return false;
  69
  70                 final IResource resource = selectedResources[0];
  71                 if (!(resource instanceof IFile)) {
  72                         return false;
  73                 }
  74                 final RepositoryMapping mapping = RepositoryMapping.getMapping(resource.getProject());
  75                 return mapping != null;
  76         }
  77
  78
  79 }