openstackclient: fix error for some with readline

[cardoe]

When using the openstack CLI on some macOS machines users will get the following:

Readline features including tab completion have been disabled because no supported version of readline was found. To resolve this, install pyreadline3 on Windows or gnureadline on Linux/Mac.

This adds installing gnureadline.

• [x] Have you followed the guidelines for contributing?
• [x] Have you ensured that your commits follow the commit style guide?
• [x] Have you checked that there aren't other open pull requests for the same formula update/change?
• [x] Have you built your formula locally with HOMEBREW_NO_INSTALL_FROM_API=1 brew install --build-from-source <formula>, where <formula> is the name of the formula you're submitting?
• [x] Is your test running fine brew test <formula>, where <formula> is the name of the formula you're submitting?
• [x] Does your build pass brew audit --strict <formula> (after doing HOMEBREW_NO_INSTALL_FROM_API=1 brew install --build-from-source <formula>)? If this is a new formula, does it pass brew audit --new <formula>?

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[SMillerDev]

Why are they getting this? Is it because of a macOS bug?

[cardoe]

Why are they getting this? Is it because of a macOS bug?

Not sure. It seems so far when Python 3.13 was used that it's triggered. I can get some more folks to give me feedback.

[Bo98]

Do you have steps to reproduce? A common bug with tab completion we hear is code that does:

readline.parse_and_bind("tab:complete")

This is incorrect on macOS and should instead be:

if readline.backend == "editline":
    readline.parse_and_bind("bind ^I rl_complete")
else:
    readline.parse_and_bind("tab: complete")

[Bo98]

Ah right I see it's from cmd2 using readline.set_completion_display_matches_hook. In that case this seems like the only solution, at least until cmd2 3.0.

Ideally we'd only do this on macOS though - don't think we support OS-specific packages yet but another maintainer might know for sure.

[cardoe]

Is there something I should pursue to land this? Or suggest to OpenStack upstream a change?

[cardoe]

Happy to close or do the needful to land this. Just need some advice on direction.

[daeho-ro]

• https://github.com/Homebrew/homebrew-core/issues/132854

[daeho-ro]

I don't know why it fails on intel macos 😥

[github-actions[bot]]

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