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/*******************************************************************************
* Copyright (C) 2009, Stefan Lay <stefan.lay@sap.com>
*
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/epl-v10.html
*******************************************************************************/
package org.eclipse.egit.ui.internal.actions;
import java.io.IOException;
import org.eclipse.compare.CompareUI;
import org.eclipse.compare.ITypedElement;
import org.eclipse.core.commands.ExecutionEvent;
import org.eclipse.core.commands.ExecutionException;
import org.eclipse.core.resources.IFile;
import org.eclipse.core.resources.IResource;
import org.eclipse.egit.core.project.RepositoryMapping;
import org.eclipse.egit.ui.Activator;
import org.eclipse.egit.ui.internal.CompareUtils;
import org.eclipse.egit.ui.internal.GitCompareFileRevisionEditorInput;
import org.eclipse.jgit.lib.Constants;
import org.eclipse.jgit.lib.Ref;
import org.eclipse.jgit.lib.Repository;
import org.eclipse.jgit.revwalk.RevCommit;
import org.eclipse.jgit.revwalk.RevWalk;
import org.eclipse.team.ui.synchronize.SaveableCompareEditorInput;
/**
* Compares the working tree content of a file with the version of the file in
* the HEAD commit.
*/
public class CompareWithHeadActionHandler extends RepositoryActionHandler {
public Object execute(ExecutionEvent event) throws ExecutionException {
final IResource resource = getSelectedResources(event)[0];
final RepositoryMapping mapping = RepositoryMapping.getMapping(resource
.getProject());
final Repository repository = mapping.getRepository();
final String gitPath = mapping.getRepoRelativePath(resource);
final IFile baseFile = (IFile) resource;
final ITypedElement base = SaveableCompareEditorInput
.createFileElement(baseFile);
ITypedElement next;
try {
Ref head = repository.getRef(Constants.HEAD);
RevWalk rw = new RevWalk(repository);
RevCommit commit = rw.parseCommit(head.getObjectId());
next = CompareUtils.getFileRevisionTypedElement(gitPath, commit,
repository);
} catch (IOException e) {
Activator.handleError(e.getMessage(), e, true);
return null;
}
final GitCompareFileRevisionEditorInput in = new GitCompareFileRevisionEditorInput(
base, next, null);
CompareUI.openCompareEditor(in);
return null;
}
@Override
public boolean isEnabled() {
final IResource[] selectedResources = getSelectedResources();
if (selectedResources.length != 1)
return false;
final IResource resource = selectedResources[0];
if (!(resource instanceof IFile)) {
return false;
}
final RepositoryMapping mapping = RepositoryMapping.getMapping(resource
.getProject());
return mapping != null;
}
}
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