Diff with previous version

My Tortoise context menu provides a "Diff with previous version" option,
which generates exactly the diff I need. However, when I try to script the
same functionality, I get different behavior.

"Diff with previous version" shows the on-disk copy of my file in the right
pane (called "Working copy"), and the previous revision in the left pane
(called "Revision 68"), so I see the differences I'm looking for.

However, when I try to simulate this from the command line (TortoiseProc
/command:diff /path:MyFile.java), I see the same right pane, but "Revision
69" in the left pane, so there are no differences.

How do I perform the "Diff with previous version" command with TortoiseProc,
by using command parameters, etc.? If there is no way, is there a way to do
it with a pure command-line SVN package?

I'm trying to genericize this diff, so I can add a hook to my text editor to
show the diff between the current version and previous version of any file,
without having to know the exact version numbers of the file selected.

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