Info: hide older kegs

[HaraldNordgren]

I temporarily switched to my old laptop with outdated packages, and was confused about the output now, so thought I would improve it.

Only show the newest keg of each formula plus any linked keg in the "Installed Kegs and Versions" section by default. Older, non-linked kegs are listed only with --verbose.

$ brew info python
==> python@3.14 ↑: 3.7.1 → stable 3.14.6
...
==> Installed Kegs and Versions
python@3.9 ↑  3.9.4 → 3.9.25 (7,828 files, 121.3MB) [Linked]
python@3.14 ↑ 3.7.1 → 3.14.6 (3,904 files, 63.3MB)


$ brew info python -v
==> python@3.14 ↑: 3.7.1 → stable 3.14.6
...
==> Installed Kegs and Versions
python@3.9 ↑  3.9.4 → 3.9.25 (7,828 files, 121.3MB) [Linked]
  Built from source on 2021-04-11 at 22:10:27
python@3.14 ↑ 3.7.1 → 3.14.6 (3,904 files, 63.3MB)
  Poured from bottle on 2018-11-18 at 00:53:51
python@3.14 ↑ 3.6.4_4        (4,831 files, 105MB)
  Poured from bottle on 2018-03-10 at 12:12:56
python@3.14 ↑ 3.6.1          (3,807 files, 61MB)
  Poured from bottle on 2017-06-25 at 03:09:08
python@3.14 ↑ 2.7.14_2       (3,576 files, 51.8MB)
  Poured from bottle on 2018-02-04 at 12:50:32

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• AI was used to generate or assist with generating this PR.

Claude Code wrote the code as it iterated toward the solution.

Manually tested changes.

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[HaraldNordgren]

Prevent a problem where kegs were showing up twice because of symlinking.

[carlocab]

I'm not convinced this is the right fix. In general, I think it is useful if brew info $formula shows all the installed versions kegs (the header does say ==> Installed Kegs and Versions after all).

The output you're seeing does seem pathological, but this seems to be atypical for brew info (usually it just shows older installed versions).

[HaraldNordgren]

@carlocab I'm temporarily on an old machine that is stuck at macOS 12 and cannot be upgraded anymore, so Homebrew is does not officially support it. I hope that is not causing this.

The output you're seeing does seem pathological, but this seems to be atypical for brew info (usually it just shows older installed versions).

With that said, we recently changed how older versions are displayed, maybe that's why the output is expected for you?

• Annotate upgradable dependencies in install plans #22761 (Annotate upgradable dependencies in install plans)
• info: indicate upgrade target for outdated @-versioned formulae #22321 (info: indicate upgrade target for outdated @-versioned formulae)
• info: show other installed versions #22241 (info: show other installed versions)

The main problem with the old unliked version is that because brew switch doesn't exist anymore, there is not way to actually switch to them. So they are zombie versions, why do we need to display them? I thought I would keep them around inside of the verbose view just for correctness 😃

[HaraldNordgren]

We can also change the header to be ==> Installed Versions