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you can install directly from the pull request, without waiting for it to be merged: https://github.com/mxcl/homebrew/wiki/Tips-N%27-Tricks

use this URL: https://raw.github.com/ridiculousfish/homebrew/9a481458491b6...

There's the package fishfish whose version is stable OpenBeta_r2.

That version is nearly a year old; the fishfish formula was temporary and will be removed from Homebrew as soon as the canonical fish formula has been updated to 2.0. Hopefully the Homebrew maintainers will merge this soon (not sure what the hold-up is): https://github.com/mxcl/homebrew/pull/19887

It was available just now in brew for me.

That's probably the old 1.23.1 version. Run "brew info fish" and that's most likely what you'll see. Homebrew maintainers, as noted above, have not yet merged the pull request: https://github.com/mxcl/homebrew/pull/19887