Re: [EGIT PATCH] Show diff when double-clicking on file in commit dialog

[Robin Stocker <robin@nibor.org>]

When double-clicking on a file in the commit dialog, a compare dialog is
shown with the changes that are about to be committed. It compares the
HEAD version with the working tree version.

Signed-off-by: Robin Stocker <robin@nibor.org>
---

Robin Rosenberg schrieb:
> söndag 08 mars 2009 21:09:49 skrev Robin Stocker <robin@nibor.org>:
>> An essential feature I miss in EGit at the moment (apart from the
>> synchronize view [1]) is seeing what changes one is about to commit. In
>> the Subclipse SVN plugin one can double-click a file in the commit
>> dialog and the diff is shown.
> Hi, Robin. I miss that too!
> 
>> This patch is a first step for adding this to EGit. It only compares the
>> index version to the working tree version as I couldn't figure out an
>> easy way to get the HEAD version.
> You can look at how GitDocument does it.
> 
>> It's more a proof of concept than a final patch. What do you think?
> 
> I've started on an version with the diff integrated into the same dialog, for
> some reasons it's not done yet, but we might takes this meanwhile unless
> I complete the dialog real quick, as this is really useful, provided we compare
> with HEAD.

That sounds even better! For the meantime, I've updated the patch to
compare with HEAD.

-- Robin

.../egit/ui/internal/dialogs/CommitDialog.java     |   56 ++++++++++++++++++++
 1 files changed, 56 insertions(+), 0 deletions(-)

diff --git a/org.spearce.egit.ui/src/org/spearce/egit/ui/internal/dialogs/CommitDialog.java b/org.spearce.egit.ui/src/org/spearce/egit/ui/internal/dialogs/CommitDialog.java
index 8b7fe45..b69a4ba 100644
--- a/org.spearce.egit.ui/src/org/spearce/egit/ui/internal/dialogs/CommitDialog.java
+++ b/org.spearce.egit.ui/src/org/spearce/egit/ui/internal/dialogs/CommitDialog.java
@@ -18,6 +18,8 @@
 import java.util.Comparator;
 import java.util.Iterator;
 
+import org.eclipse.compare.CompareUI;
+import org.eclipse.compare.ITypedElement;
 import org.eclipse.core.resources.IFile;
 import org.eclipse.core.resources.IProject;
 import org.eclipse.jface.dialogs.Dialog;
@@ -52,9 +54,17 @@
 import org.eclipse.swt.widgets.Table;
 import org.eclipse.swt.widgets.TableColumn;
 import org.eclipse.swt.widgets.Text;
+import org.eclipse.team.core.RepositoryProvider;
+import org.eclipse.team.core.history.IFileHistory;
+import org.eclipse.team.core.history.IFileRevision;
+import org.eclipse.team.internal.ui.history.FileRevisionTypedElement;
 import org.eclipse.ui.model.WorkbenchLabelProvider;
+import org.spearce.egit.core.GitProvider;
+import org.spearce.egit.core.internal.storage.GitFileHistoryProvider;
 import org.spearce.egit.core.project.RepositoryMapping;
 import org.spearce.egit.ui.UIText;
+import org.spearce.egit.ui.internal.GitCompareFileRevisionEditorInput;
+import org.spearce.jgit.lib.Commit;
 import org.spearce.jgit.lib.Constants;
 import org.spearce.jgit.lib.GitIndex;
 import org.spearce.jgit.lib.PersonIdent;
@@ -262,6 +272,8 @@ public void modifyText(ModifyEvent e) {
 		resourcesTable.setLayoutData(GridDataFactory.fillDefaults().hint(600,
 				200).span(2,1).grab(true, true).create());
 
+		resourcesTable.addSelectionListener(new CommitItemSelectionListener());
+
 		resourcesTable.setHeaderVisible(true);
 		TableColumn statCol = new TableColumn(resourcesTable, SWT.LEFT);
 		statCol.setText(UIText.CommitDialog_Status);
@@ -505,6 +517,50 @@ public void widgetSelected(SelectionEvent e) {
 
 	}
 
+	class CommitItemSelectionListener extends SelectionAdapter {
+
+		public void widgetDefaultSelected(SelectionEvent e) {
+			IStructuredSelection selection = (IStructuredSelection) filesViewer.getSelection();
+
+			CommitItem commitItem = (CommitItem) selection.getFirstElement();
+			if (commitItem == null) {
+				return;
+			}
+
+			IProject project = commitItem.file.getProject();
+			RepositoryMapping mapping = RepositoryMapping.getMapping(project);
+			if (mapping == null) {
+				return;
+			}
+			Repository repository = mapping.getRepository();
+
+			Commit headCommit;
+			try {
+				headCommit = repository.mapCommit(Constants.HEAD);
+			} catch (IOException e1) {
+				headCommit = null;
+			}
+			if (headCommit == null) {
+				return;
+			}
+
+			GitProvider provider = (GitProvider) RepositoryProvider.getProvider(project);
+			GitFileHistoryProvider fileHistoryProvider = (GitFileHistoryProvider) provider.getFileHistoryProvider();
+
+			IFileHistory fileHistory = fileHistoryProvider.getFileHistoryFor(commitItem.file, 0, null);
+
+			IFileRevision baseFile = fileHistory.getFileRevision(headCommit.getCommitId().name());
+			IFileRevision nextFile = fileHistoryProvider.getWorkspaceFileRevision(commitItem.file);
+
+			ITypedElement base = new FileRevisionTypedElement(baseFile);
+			ITypedElement next = new FileRevisionTypedElement(nextFile);
+
+			GitCompareFileRevisionEditorInput input = new GitCompareFileRevisionEditorInput(base, next, null);
+			CompareUI.openCompareDialog(input);
+		}
+
+	}
+
 	@Override
 	protected void okPressed() {
 		commitMessage = commitText.getText();
-- 
1.6.1.2