org.eclipse.egit.ui.internal.history.command.CompareWithWorkingTreeHandler.java Source code

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Here is the source code for org.eclipse.egit.ui.internal.history.command.CompareWithWorkingTreeHandler.java

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/*******************************************************************************
 * Copyright (C) 2010, Mathias Kinzler <mathias.kinzler@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.history.command;

import java.io.File;
import java.util.Iterator;

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.egit.core.project.RepositoryMapping;
import org.eclipse.egit.ui.internal.CompareUtils;
import org.eclipse.egit.ui.internal.GitCompareFileRevisionEditorInput;
import org.eclipse.egit.ui.internal.history.GitHistoryPage;
import org.eclipse.jface.viewers.IStructuredSelection;
import org.eclipse.jgit.lib.Constants;
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;

/**
 * Compare the file content of a commit with the working tree
 */
public class CompareWithWorkingTreeHandler extends AbstractHistoryCommanndHandler {
    public Object execute(ExecutionEvent event) throws ExecutionException {
        IStructuredSelection selection = getSelection(getPage());
        if (selection.size() == 1) {
            Iterator<?> it = selection.iterator();
            RevCommit commit = (RevCommit) it.next();
            Object input = getPage().getInputInternal().getSingleFile();
            if (input instanceof IFile) {
                IFile file = (IFile) input;
                final RepositoryMapping mapping = RepositoryMapping.getMapping(file.getProject());
                final String gitPath = mapping.getRepoRelativePath(file);
                ITypedElement right = CompareUtils.getFileRevisionTypedElement(gitPath, commit,
                        mapping.getRepository());
                final GitCompareFileRevisionEditorInput in = new GitCompareFileRevisionEditorInput(
                        SaveableCompareEditorInput.createFileElement(file), right, null);
                openInCompare(event, in);
            }
            if (input instanceof File) {
                File file = (File) input;
                // TODO can we create a ITypedElement from the local file?
                Repository repo = getRepository(event);
                RevCommit leftCommit;
                try {
                    leftCommit = new RevWalk(repo).parseCommit(repo.resolve(Constants.HEAD));
                } catch (Exception e) {
                    throw new ExecutionException(e.getMessage(), e);
                }
                final String gitPath = getRepoRelativePath(repo, file);
                ITypedElement left = CompareUtils.getFileRevisionTypedElement(gitPath, leftCommit, repo);
                ITypedElement right = CompareUtils.getFileRevisionTypedElement(gitPath, commit, repo);
                final GitCompareFileRevisionEditorInput in = new GitCompareFileRevisionEditorInput(left, right,
                        null);
                openInCompare(event, in);
                return null;
            }
        }
        return null;
    }

    @Override
    public boolean isEnabled() {
        GitHistoryPage page = getPage();
        if (page == null)
            return false;
        int size = getSelection(page).size();
        if (size != 1)
            return false;
        return page.getInputInternal().isSingleFile();
    }
}