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zaw's[1] history widget on Ctrl-R is so much better than the regular backward history search that it's difficult to imagine using a shell without it anymore.

1: https://github.com/zsh-users/zaw

I like the concept.
It would be cool if this functionality could be hooked into cd like rvm does.
No it would not. I cannot begin to count the hours I've lost debugging ruby script based tools implicitly dependent on this behaviour. Just no. rbenv is better, particularly due to totally not doing that sort of "magic".
I don't understand this concept at all. How this can help me?
The main feature seems to be that you're letting me use the same command in different environments, to do different things?
This looks useful!

I've also been working on tools to make user context switching easier on the terminal (such as a project of mine called prm[0]), and I'm currently working on bringing this sort of functionality to the desktop environment.

If you (or anyone else) wants to talk about these sorts of things, or know of any good relevant research, please drop me a line here or at eivind dot arvesen at gmail dot com.

[0]: https://github.com/eivind88/prm