Brew doctor shows "Error: formulae require at least a URL"

[quackduck]

Brew gives me an error on brew doctor:

ishan@mac [~/Desktop/GitHub/Go/uniclip] |>  brew update; brew update; brew doctor
Already up-to-date.
Already up-to-date.
Error: formulae require at least a URL
Please report this issue:
  https://docs.brew.sh/Troubleshooting
/usr/local/Homebrew/Library/Homebrew/formula.rb:253:in `determine_active_spec'
/usr/local/Homebrew/Library/Homebrew/formula.rb:206:in `initialize'
/usr/local/Homebrew/Library/Homebrew/formulary.rb:153:in `new'
/usr/local/Homebrew/Library/Homebrew/formulary.rb:153:in `get_formula'
/usr/local/Homebrew/Library/Homebrew/formulary.rb:305:in `get_formula'
/usr/local/Homebrew/Library/Homebrew/formulary.rb:366:in `factory'
/usr/local/Homebrew/Library/Homebrew/formulary.rb:413:in `from_keg'
/usr/local/Homebrew/Library/Homebrew/formulary.rb:386:in `from_rack'
/usr/local/Homebrew/Library/Homebrew/diagnostic.rb:739:in `block in check_for_unreadable_installed_formula'
/usr/local/Homebrew/Library/Homebrew/diagnostic.rb:738:in `each'
/usr/local/Homebrew/Library/Homebrew/diagnostic.rb:738:in `check_for_unreadable_installed_formula'
/usr/local/Homebrew/Library/Homebrew/cmd/doctor.rb:64:in `block in doctor'
/usr/local/Homebrew/Library/Homebrew/cmd/doctor.rb:57:in `each'
/usr/local/Homebrew/Library/Homebrew/cmd/doctor.rb:57:in `doctor'
/usr/local/Homebrew/Library/Homebrew/brew.rb:122:in `<main>'

[carlocab]

What does brew config say?

[quackduck]

HOMEBREW_VERSION: 3.0.1-122-gcdaf5cc
ORIGIN: https://github.com/Homebrew/brew
HEAD: cdaf5cca165c3edfc63074f5cd6ca04234bb3ef4
Last commit: 2 days ago
Core tap ORIGIN: https://github.com/Homebrew/homebrew-core
Core tap HEAD: 1bd50bf3a468b9781c1a2b2ea02c045de603f37d
Core tap last commit: 30 minutes ago
Core tap branch: master
HOMEBREW_PREFIX: /usr/local
HOMEBREW_CASK_OPTS: []
HOMEBREW_MAKE_JOBS: 4
Homebrew Ruby: 2.6.3 => /System/Library/Frameworks/Ruby.framework/Versions/2.6/usr/bin/ruby
CPU: quad-core 64-bit broadwell
Clang: 12.0 build 1200
Git: 2.30.1 => /usr/local/bin/git
Curl: 7.64.1 => /usr/bin/curl
macOS: 11.2-x86_64
CLT: 12.4.0.0.1.1610135815
Xcode: N/A

[gromgit]

What's the output of brew readall?

[quackduck]

Error: Invalid formula: /usr/local/Homebrew/Library/Taps/quackduck/homebrew-tap/rem.rb
formulae require at least a URL

mentioned file:

# typed: false
# frozen_string_literal: true

# This file was generated by GoReleaser. DO NOT EDIT.
class Rem < Formula
  desc "Rem is a CLI Trash which makes it ridiculously easy to recover them."
  homepage "https://github.com/quackduck/rem"
  version "2.2.0"
  bottle :unneeded
  depends_on :linux

  if OS.linux? && Hardware::CPU.intel?
    url "https://github.com/quackduck/rem/releases/download/v2.2.0/rem_2.2.0_Linux_x86_64.tar.gz"
    sha256 "d08a3f6cd7de9f290216ad033935d7be3af98488b0a314c1100e14c83870796c"
  end
  if OS.linux? && Hardware::CPU.arm? && !Hardware::CPU.is_64_bit?
    url "https://github.com/quackduck/rem/releases/download/v2.2.0/rem_2.2.0_Linux_armv6.tar.gz"
    sha256 "5915602c3a6dd313d56fcc14a1aafabf54e426b3acbf45974d0814d651b5cb0f"
  end

  def install
    bin.install "rem"
  end
end

[quackduck]

Deleting that file fixes the problem, but what is the problem with that file?

[SMillerDev]

you're on a mac so there is no block that provides a URL, which is a requirement for formulae. Since it has depends_on :linux it should be changed to:

  if Hardware::CPU.intel?
    url "https://github.com/quackduck/rem/releases/download/v2.2.0/rem_2.2.0_Linux_x86_64.tar.gz"
    sha256 "d08a3f6cd7de9f290216ad033935d7be3af98488b0a314c1100e14c83870796c"
  end
  if Hardware::CPU.arm? && !Hardware::CPU.is_64_bit?
    url "https://github.com/quackduck/rem/releases/download/v2.2.0/rem_2.2.0_Linux_armv6.tar.gz"
    sha256 "5915602c3a6dd313d56fcc14a1aafabf54e426b3acbf45974d0814d651b5cb0f"
  end

[quackduck]

That makes sense! Thanks!

[quackduck]

I've fixed the issue just now