brew failing when typing

[metalbracket]

brew doctor output

Your system is ready to brew.

Verification

• My "brew doctor output" above says Your system is ready to brew. and am still able to reproduce my issue.
• I ran brew update twice and am still able to reproduce my issue.
• This issue's title and/or description do not reference a single formula e.g. brew install wget. If they do, open an issue at https://github.com/Homebrew/homebrew-core/issues/new/choose instead.

brew config output

HOMEBREW_VERSION: 4.4.17
ORIGIN: https://github.com/Homebrew/brew
HEAD: 55f399c10dc7e6cc07497bdfccdecc96329e3b57
Last commit: 23 hours ago
Branch: master
Core tap JSON: 20 Jan 19:49 UTC
Core cask tap JSON: 20 Jan 19:49 UTC
HOMEBREW_PREFIX: /usr/local
HOMEBREW_CASK_OPTS: []
HOMEBREW_DISPLAY: /private/tmp/com.apple.launchd.mAIjh4Rybo/org.xquartz:0
HOMEBREW_EDITOR: codium --wait
HOMEBREW_MAKE_JOBS: 4
HOMEBREW_SORBET_RUNTIME: set
Homebrew Ruby: 3.3.7 => /usr/local/Homebrew/Library/Homebrew/vendor/portable-ruby/3.3.7/bin/ruby
CPU: quad-core 64-bit kabylake
Clang: 15.0.0 build 1500
Git: 2.39.3 => /Library/Developer/CommandLineTools/usr/bin/git
Curl: 8.7.1 => /usr/bin/curl
macOS: 13.7-x86_64
CLT: 15.1.0.0.1.1700200546
Xcode: N/A

What were you trying to do (and why)?

I was trying to use brew install to install a package but had caplocks on.

What happened (include all command output)?

brew INSTALL
/usr/local/Homebrew/Library/Homebrew/abstract_command.rb:59: warning: already initialized constant Homebrew::Cmd::InstallCmd::Args
/usr/local/Homebrew/Library/Homebrew/abstract_command.rb:59: warning: previous definition of Args was here
Error: private method `install' called for module Homebrew
/usr/local/Homebrew/Library/Homebrew/brew.rb:97:in `public_send'
/usr/local/Homebrew/Library/Homebrew/brew.rb:97:in `<main>'
Please report this issue:
https://docs.brew.sh/Troubleshooting

What did you expect to happen?

I expected it to install or fail

Step-by-step reproduction instructions (by running brew commands)

brew INSTALL

[metalbracket]

Also, it is using ` to open a string and ' to close like in `public_send'?

[rrotter]

Seeing a similar problem with brew --cache:

~ % brew --CACHE
Error: undefined method `__cache' for module Homebrew
/opt/homebrew/Library/Homebrew/brew.rb:97:in `public_send'
/opt/homebrew/Library/Homebrew/brew.rb:97:in `<main>'
Please report this issue:
  https://docs.brew.sh/Troubleshooting

#18705 partially addressed this issue here:

brew/Library/Homebrew/brew.rb

Lines 96 to 100 in de294f3

	begin
	Homebrew.public_send Commands.method_name(cmd)
	rescue NoMethodError => e
	case_error = "undefined method `#{cmd.downcase}' for module Homebrew"
	odie "Unknown command: brew #{cmd}" if e.message == case_error

This doesn't handle cases where the string in the NoMethodError is not correctly predicted with cmd.downcase (like --CACHE) or when there actually is a method, but it's private (which is the case for brew INSTALL).

FWIW, the private Homebrew.install method is actually from FileUtils.install:

brew(main):004> Homebrew.method(:install)
=> #<Method: #<Class:Homebrew>(FileUtils)#install(src, dest, mode: ..., owner: ..., group: ..., preserve: ..., noop: ..., verbose: ...) /opt/homebrew/Library/Homebrew/vendor/portable-ruby/3.3.7/lib/ruby/3.3.0/fileutils.rb:1609>

…and it's pulled into the Homebrew module's namespace here:

brew/Library/Homebrew/global.rb

Lines 59 to 60 in de294f3

	module Homebrew
	extend FileUtils

That has no bearing on a fix, but I spent quite a while looking into that mystery, so I'd thought I'd share.

I'll send a PR shortly that fixes what I've detailed above, but…

The warnings (warning: already initialized constant) are another problem altogether. They are caused by a recursive require, and I'm pretty sure it's actually a ruby bug. The warnings from brew INFO better illuminate what's going on:

~ % brew INFO
/opt/homebrew/Library/Homebrew/cmd/INFO.rb:19: warning: already initialized constant Homebrew::Cmd::Info::VALID_DAYS
/opt/homebrew/Library/Homebrew/cmd/info.rb:19: warning: previous definition of VALID_DAYS was here
/opt/homebrew/Library/Homebrew/cmd/INFO.rb:20: warning: already initialized constant Homebrew::Cmd::Info::VALID_FORMULA_CATEGORIES
/opt/homebrew/Library/Homebrew/cmd/info.rb:20: warning: previous definition of VALID_FORMULA_CATEGORIES was here
/opt/homebrew/Library/Homebrew/cmd/INFO.rb:21: warning: already initialized constant Homebrew::Cmd::Info::VALID_CATEGORIES
/opt/homebrew/Library/Homebrew/cmd/info.rb:21: warning: previous definition of VALID_CATEGORIES was here
/opt/homebrew/Library/Homebrew/abstract_command.rb:59: warning: already initialized constant Homebrew::Cmd::Info::Args
/opt/homebrew/Library/Homebrew/abstract_command.rb:59: warning: previous definition of Args was here

[rrotter]

I should add, the warnings are produced exactly at this line:

brew/Library/Homebrew/brew.rb

Line 65 in de294f3

internal_cmd = Commands.valid_internal_cmd?(cmd) || Commands.valid_internal_dev_cmd?(cmd) if cmd

which (counterintuitively?) is where we require the command.

[rrotter]

Ruby issue: #21091 recursive require not detected on case insensitive filesystem