cmd/info: show size information

[cho-m]

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Follow up to #18144

Proof of concept for now on getting size info into brew info.

May need to see if any better ways to get this information out of the manifest. A bit trickier than just tab info.

❯ brew info cling git-town --github-manifest
==> cling: stable 1.0 (bottled)
C++ interpreter
https://root.cern/cling/
Not installed
Bottle size: 264.3MB
From: https://github.com/Homebrew/homebrew-core/blob/HEAD/Formula/c/cling.rb
License: (LGPL-2.1-only or NCSA) and (Apache-2.0 with LLVM-exception)
==> Dependencies
Build: cmake ✘

==> git-town: stable 15.3.0 (bottled)
High-level command-line interface for Git
https://www.git-town.com/
Not installed
Bottle size: 5MB
Installed size: 16.0MB
From: https://github.com/Homebrew/homebrew-core/blob/HEAD/Formula/g/git-town.rb
License: MIT
==> Dependencies
Build: go ✔

For comparison

• Apt uses Download-Size and Installed-Size.
• https://archlinux.org/packages shows Package Size and Installed Size.

Also, mainly an approximate if pouring bottle into non-standard prefix.

[MikeMcQuaid]

Makes sense to me so far, nice work!

Would be interested (post-merge) in benchmarks for this so we can consider how to get to being able to put these in the API.

CC @reitermarkus also for thoughts on whether the parallel downloading work overlaps here and when it might be ready.

[reitermarkus]

on whether the parallel downloading work overlaps here

Yes, slight overlap, but the changes to Resource here seem to be exactly the same, so shouldn't conflict too hard.

[cho-m]

Updated and should be ready for review. Will be working on more JSON API code path in #18403 (WIP).

Changes include:

• always show size info if manifest is already downloaded
• Renamed arg to --fetch-manifest as that is literally what it does. After WIP PR, this will behave similar to brew fetch --only-manifest <formula>; brew info <formula>

[MikeMcQuaid]

This is great, thanks @cho-m!