Trac Changeset Module

Trac has a built-in functionality for visualizing diffs - changes to files.

The Changeset View

When viewing a commited changeset, such as when clicking a changeset TracLink or a changeset event-line in the timeline, Trac will display what changes this current set of patches imposes.

The changeset view consists of two parts, the header and the diff view.

Changeset Header

The header shows an overview of the whole changeset. Here you will find information such as:

Timestamp -- When the changeset was commited
Author -- Who commited the changeset
Message -- A brief description from the author (the commit log message)
Files -- A list of files affected by this changeset

In front of each listed file, you'll find a colored rectangle. The color indicates how the file is affected by the changeset.

Green: Added
Red: Removed
Yellow: Modified

The color legend is located below the header as a reminder.

Diff View

Below the header is the main part of the changeset, the diff view. Each file is shown in a separate section, each of which will contain only the regions of the file that are affected by the changeset. There are two different styles of displaying the diffs: inline or side-by-side (you can switch between those styles using the preferences form):

The inline style shows the changed regions of a file underneath eachother. A region removed from the file will be colored red, an added region will be colored green. If a region was modified, the old version is displayed above the new version. Line numbers on the left side indicate the exact position of the change in both the old and the new version of the file.
The side-by-side style shows the old version of the left and the new version on the right (this will typically require more screen width than the inline style.) Added and removed regions will be colored in the same way as with the inline style (green and red, respectively), but modified regions will have a yellow background.

In addition, various advanced options are available in the preferences form for adjusting the display of the diffs:

You can set how many lines are displayed before and after every change
You can toggle whether blank lines, case changes and white space changes are ignored, thereby letting you find the functional changes more quickly