Trac has a built-in functionality for visualizing "diffs", or changes to files.
There are different kinds of change sets. Some correspond to revisions made in the repositories, others aggregate changes made in several revisions. Ultimately, any kind of difference can be shown.
The changeset view consists of two parts, the header and the diff views.
The header shows an overview of the whole changeset. Here you will find metadata:
If more than one revision is involved in the set of changes being displayed, the Timestamp, Author and Message fields will not be shown.
A colored rectangle indicates how the file is affected by the changeset:
The color legend is located below the header.
Below the header is the main part of the changeset, the diff view. Each file is shown in a separate section. There are two different diff styles: inline and side-by-side. You can switch between the styles using the preferences form:
In addition, various advanced options are available in the preferences form for adjusting the display of the diffs:
When viewing a repository check-in, such as when following a changeset link or a changeset event in the timeline, Trac will display the exact changes made by the check-in.
There will also be navigation links to the Previous Changeset and the Next Changeset.
From the changeset view, the changeset can be downloaded in unified diff format using the links at the bottom of the page. The full content of each file in the changeset can also be downloaded as a zip archive.
Often you want to look at changes made on a file or on a directory spanning multiple revisions. The easiest way to get there is from the TracRevisionLog, where you can select the old and the new revisions of the file or directory, and then click the View changes button.
One of the core features of version control systems is the possibility to work simultaneously on different Lines of Developments, commonly called "branches". Trac enables you to examine the exact differences between such branches.
Following the View changes ... button in the TracBrowser leads to the diff page, where you can enter From: and To: path/revision pairs. The resulting set of differences consist of the changes that should be applied to the From: content to get to the To: content.
For convenience, it is possible to invert the roles of the old and the new path/revision pairs by clicking the Reverse Diff link on the changeset page.
Another way to examine changes is to use the Last Change link provided by the TracBrowser.
This link will take you to the last change that was made on that path. From there, you can use the Previous Change and Next Change links to traverse the change history of the file or directory.
See also: TracGuide, TracBrowser