It's almost done (it would take one or two weeks to clean it up for FOSS release). It's a CLI tool. It works great for my use case, but I'm wondering if there's any interest in a tool like this.

Say you have a simple time-tracking tool that tracks what you do daily. The only problem is that there are gaps and whatnot, which might not look nice if you need to send it to someone else. This tool fixes pretty much all of that.

Main format is a JSON with a "description", and either "duration" or a "start"/"end" pair. It supports the Timewarrior format out of the box (CLI Time tracking tool).