Martin Fowler on the software I've been using almost every day for the past 12 years...
Emacs is an elderly piece of software, dating back to the mid 70's. Its philosophy of allowing people to easily extend it by modifying the live environment is something shared with a few other elderly-but-groundbreaking systems, such as lisp machines and Smalltalk.
That philosophy seems rarer now. Certainly there are plenty of extensible systems, you can install plugins for browsers like Firefox and editing suites like Eclipse. The whole free/open source movement is about giving you access to the code that runs your machines so you can (in theory) tweak it to your heart's content. But there's a palpable difference between extensions in most of these environments and the kind of reprogramming you do in emacs or Smalltalk. Something about how it's easy to quickly do small modifications, such as the new command I added above. It's also about doing it without leaving the environment - I don't fire up some separate toolchain to add an emacs function, I work within emacs itself.
... Anyone who's had a taste of Internal Reprogrammability wonders why
all software isn't internally reprogrammable. That - in part - was the
impetus behind ScriptCraft, to make Minecraft internally
reprogrammable. With Bukkit and ScriptCraft, changing game behaviour on
the fly is simple - edit your script, save it, then type
at the in-game console. No need to recompile , package in a jar file,
restart servers, restart consoles and all of the other overhead that
makes java development such a pain. Bukkit does a great job of removing
most of that pain and ScriptCraft eliminates the need to recompile and repackage.
If internal reprogrammability is rare for tools aimed at programmers, it's even rarer for tools aimed at non-programmers. I've often wondered if that ought to change. What would come from making more tools exhibit this quality? Would this encourage more people to learn about programming, the better to control the environment that they spend so much time in? This was certainly part of Alan Kay's vision of the dynabook. He saw children not as passive consumers of media, but actively programming their environment.
That's what I hope ScriptCraft will encourage in young people playing Minecraft, that the next time they think "Wouldn't it be cool if you could do X in Minecraft", they don't go googling for a mod, they write the mod themselves.