I know many langauges, but I enjoy ruby the most. I'm not sure why programming an IDE and running arbitrary ruby programs wouldn't be useful?
I can make a one-liner in ruby to do what I want as fast as I can make a macro, generally. Moving files and directories, find and replace with conditional logic, running cleanup scripts, after-update hooks, generated files. Those are just a couple of things I might use it for, and I'd like it in the IDE so I can just work out of there. The point of programming is that it lets me do anything.
For eg. In Perl there is big momentum behind Padre (http://padre.perlide.org/) and there are similar projects in Python (quick google shows Leo & Pyk).
I can make a one-liner in ruby to do what I want as fast as I can make a macro, generally. Moving files and directories, find and replace with conditional logic, running cleanup scripts, after-update hooks, generated files. Those are just a couple of things I might use it for, and I'd like it in the IDE so I can just work out of there. The point of programming is that it lets me do anything.