Zawinski: Yeah. Maybe there'd be a vague description of the division between library and front end. But probably not. If I was working alone I wouldn't bother with that because that part is just kind of obvious to me. And then the first thing I would do with something like that is either start at the top or at the bottom. So start with either, put a window on the screen that has some buttons on it, and then dig down and start building the stuff that those buttons do. Or you can start at the other side and start writing the thing that parses mailboxes and that saves mailboxes. Either way. or both and meet in the middle.

I find that getting something on the screen as soon as possible really helps focus the problem for me. It helps me decide what to work on next. Because if you're just looking at that big to-do list it's like, eh, I don't know which one I should do—does it matter which one I do? But if there's something you can actually look at, even if it's just the debug output of your mailbox parser, it's like, OK, there! That's something; what's the next direction this needs to go in? OK, instead of just displaying a tree structure, now maybe I should be emitting HTML or something along those lines. Or parsing the headers in a more detailed way. You just look for the next thing to build on from there.