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.internal.storage.GitFileRevision;
  19 import org.eclipse.egit.core.project.RepositoryMapping;
  20 import org.eclipse.egit.ui.UIText;
  21 import org.eclipse.egit.ui.internal.GitCompareFileRevisionEditorInput;
  22 import org.eclipse.jface.action.IAction;
  23 import org.eclipse.jgit.lib.Constants;
  24 import org.eclipse.jgit.lib.Ref;
  25 import org.eclipse.jgit.lib.Repository;
  26 import org.eclipse.jgit.revwalk.RevCommit;
  27 import org.eclipse.jgit.revwalk.RevWalk;
  28 import org.eclipse.jgit.treewalk.TreeWalk;
  29 import org.eclipse.osgi.util.NLS;
  30 import org.eclipse.team.core.history.IFileRevision;
  31 import org.eclipse.team.internal.ui.history.FileRevisionTypedElement;
  32 import org.eclipse.team.ui.synchronize.SaveableCompareEditorInput;
  33
  34 /**
  35  * Compares the working tree content of a file with the version of the file
  36  * in the HEAD commit.
  37  */
  38 public class CompareWithHeadAction extends RepositoryAction {
  39
  40         public void execute(IAction action) throws InvocationTargetException {
  41                 final IResource resource = getSelectedResources()[0];
  42                 final RepositoryMapping mapping = RepositoryMapping.getMapping(resource.getProject());
  43                 final Repository repository = mapping.getRepository();
  44                 final String gitPath = mapping.getRepoRelativePath(resource);
  45
  46
  47                 final IFile baseFile = (IFile) resource;
  48                 final ITypedElement base = SaveableCompareEditorInput.createFileElement(baseFile);
  49
  50                 ITypedElement next;
  51                 try {
  52                         Ref head = repository.getRef(Constants.HEAD);
  53                         RevWalk rw = new RevWalk(repository);
  54                         RevCommit commit = rw.parseCommit(head.getObjectId());
  55
  56                         next = new GitCompareFileRevisionEditorInput.EmptyTypedElement(NLS.bind(UIText.GitHistoryPage_FileNotInCommit,
  57                                         resource.getName(), commit));
  58                         TreeWalk w = TreeWalk.forPath(repository, gitPath, commit.getTree());
  59                         // check if file is contained in commit
  60                         if (w != null) {
  61                                 final IFileRevision nextFile = GitFileRevision.inCommit(repository, commit, gitPath, null);
  62                                 next = new FileRevisionTypedElement(nextFile);
  63                         }
  64                 } catch (IOException e) {
  65                         // this exception is handled by TeamAction.run
  66                         throw new InvocationTargetException(e);
  67                 }
  68
  69
  70                 final GitCompareFileRevisionEditorInput in = new GitCompareFileRevisionEditorInput(
  71                                 base, next, null);
  72                 CompareUI.openCompareEditor(in);
  73         }
  74
  75         @Override
  76         public boolean isEnabled() {
  77                 final IResource[] selectedResources = getSelectedResources();
  78                 if (selectedResources.length != 1)
  79                         return false;
  80
  81                 final IResource resource = selectedResources[0];
  82                 if (!(resource instanceof IFile)) {
  83                         return false;
  84                 }
  85                 final RepositoryMapping mapping = RepositoryMapping.getMapping(resource.getProject());
  86                 return mapping != null;
  87         }
  88
  89
  90 }