Use gvim for diff under TortoiseCVS
From Vim Tips Wiki
created July 17, 2006 · complexity basic · author Tom Purl · version 6.0
The diff mode of Vim and Gvim is really excellent, and I like to use it as the external diff application with TortoiseCVS. Here's how you would configure this:
1. Right-click any file and choose "CVS -> Preferences".
2. In the TortoiseCVS window, choose the "Tools" tab.
3. Place the following in the "Diff Application" text box (adjust for your Vim install location):
4. Place the following in the "Two-way diff parameters" text box:
-d "%1" "%2"
Now you should be able to right-click a CVS-controlled file, choose the "CVS diff" option and view results in Gvim.
Any additional Gvim parameters should only appear in the "Two-way diff parameters" text box, not the "Diff application" text box.