Life, the work day, and personal projects don't always give us the opportunity the commit code at a logical completion (functionality subset programmed, bug fix completely patched, etc.).
Sometimes we need to stop working half way through a new method, or through a half-baked fix. Think... The work day ends, or it is time to shut down for the evening.
I feel guilty in doing a commit at this point. Mostly because my commit message is some daft comment saying "Started to do blah" or "Did this partially but need to complete".
Committing without a nice a logical stop feels sloppy, mostly for commit log and historical purposes.
But at the same time I don't like to "disconnect" from the code or call it quits with an uncommitted working directory. Maybe unfounded, but also for the sense of not having a dvcs backup at this point in case of a hardware failure.
What is the right approach here? When you are at a force programming stopping point but not a logical stopping point in the code, commit or wait until that logical containment is done to commit? Does the latter contradict the "commit often" mantra? It just seems history and diffing this could become difficult to understand after the fact.