(In my experience with Octopress, every time we tried to implement an auto-open functionality, it backfired: the `$EDITOR` variable was not configured properly and/or most people didn't want to write the post just then. Or they wanted to generate a flurry of posts in quick succession.

Also, most users of some editors (e.g. vim) preferred for a file to open in the pre-existing buffer, instead of a new instance of the `vim` process. I know most GUI editors will tab nicely (e.g. TextMate) but this kind of functionality gets really personal :/