Refactor `$LOAD_PATH`.

Library/Homebrew/brew.rb

@@ -12,20 +12,7 @@ if RUBY_X < 2 || (RUBY_X == 2 && RUBY_Y < 3)
   raise "Homebrew must be run under Ruby 2.3! You're running #{RUBY_VERSION}."
 end
 
-require "pathname"
-HOMEBREW_LIBRARY_PATH = Pathname.new(__FILE__).realpath.parent
-
-require "English"
-
-unless $LOAD_PATH.include?("#{HOMEBREW_LIBRARY_PATH}/cask/lib")
-  $LOAD_PATH.unshift("#{HOMEBREW_LIBRARY_PATH}/cask/lib")
-end
-
-unless $LOAD_PATH.include?(HOMEBREW_LIBRARY_PATH.to_s)
-  $LOAD_PATH.unshift(HOMEBREW_LIBRARY_PATH.to_s)
-end
-
-require "global"
+require_relative "global"
 
 begin
   trap("INT", std_trap) # restore default CTRL-C handler

Library/Homebrew/config.rb

@@ -46,14 +46,3 @@ HOMEBREW_TEMP = begin
   tmp.mkpath unless tmp.exist?
   tmp.realpath
 end
-
-unless defined? HOMEBREW_LIBRARY_PATH
-  # Root of the Homebrew code base
-  HOMEBREW_LIBRARY_PATH = Pathname.new(__FILE__).realpath.parent
-end
-
-# Load path used by standalone scripts to access the Homebrew code base
-HOMEBREW_LOAD_PATH = [
-  HOMEBREW_LIBRARY_PATH,
-  HOMEBREW_LIBRARY_PATH/"cask/lib",
-].join(File::PATH_SEPARATOR)

Library/Homebrew/dev-cmd/ruby.rb

@@ -8,6 +8,6 @@ module Homebrew
   module_function
 
   def ruby
-    exec ENV["HOMEBREW_RUBY_PATH"], "-I", HOMEBREW_LOAD_PATH, "-rglobal", "-rdev-cmd/irb", *ARGV
+    exec ENV["HOMEBREW_RUBY_PATH"], "-I", $LOAD_PATH.join(File::PATH_SEPARATOR), "-rglobal", "-rdev-cmd/irb", *ARGV
   end
 end

Library/Homebrew/dev-cmd/test.rb

@@ -65,7 +65,7 @@ module Homebrew
         args = %W[
           #{RUBY_PATH}
           -W0
-          -I #{HOMEBREW_LOAD_PATH}
+          -I #{$LOAD_PATH.join(File::PATH_SEPARATOR)}
           --
           #{HOMEBREW_LIBRARY_PATH}/test.rb
           #{f.path}

Library/Homebrew/formula_installer.rb

@@ -729,7 +729,7 @@ class FormulaInstaller
     args = %W[
       nice #{RUBY_PATH}
       -W0
-      -I #{HOMEBREW_LOAD_PATH}
+      -I #{$LOAD_PATH.join(File::PATH_SEPARATOR)}
       --
       #{HOMEBREW_LIBRARY_PATH}/build.rb
       #{formula.specified_path}
@@ -886,7 +886,7 @@ class FormulaInstaller
     args = %W[
       nice #{RUBY_PATH}
       -W0
-      -I #{HOMEBREW_LOAD_PATH}
+      -I #{$LOAD_PATH.join(File::PATH_SEPARATOR)}
       --
       #{HOMEBREW_LIBRARY_PATH}/postinstall.rb
       #{formula.path}

Library/Homebrew/global.rb

 require "pathname"
+require "English"
+
+HOMEBREW_LIBRARY_PATH = Pathname.new(__FILE__).realpath.parent
+
+unless $LOAD_PATH.include?("#{HOMEBREW_LIBRARY_PATH}/cask/lib")
+  $LOAD_PATH.push("#{HOMEBREW_LIBRARY_PATH}/cask/lib")
+end
+
+unless $LOAD_PATH.include?(HOMEBREW_LIBRARY_PATH.to_s)
+  $LOAD_PATH.push(HOMEBREW_LIBRARY_PATH.to_s)
+end
+
+require "config"
+
 require "English"
 require "ostruct"
 require "messages"
@@ -12,7 +26,6 @@ HOMEBREW_PRODUCT = ENV["HOMEBREW_PRODUCT"]
 HOMEBREW_VERSION = ENV["HOMEBREW_VERSION"]
 HOMEBREW_WWW = "https://brew.sh".freeze
 
-require "config"
 require "extend/git_repository"
 
 HOMEBREW_REPOSITORY.extend(GitRepositoryExtension)

Library/Homebrew/test/spec_helper.rb

@@ -14,11 +14,9 @@ require "rubocop"
 require "rubocop/rspec/support"
 require "find"
 
-$LOAD_PATH.unshift(File.expand_path("#{ENV["HOMEBREW_LIBRARY"]}/Homebrew/cask/lib"))
-$LOAD_PATH.unshift(File.expand_path("#{ENV["HOMEBREW_LIBRARY"]}/Homebrew"))
-$LOAD_PATH.unshift(File.expand_path("#{ENV["HOMEBREW_LIBRARY"]}/Homebrew/test/support/lib"))
+$LOAD_PATH.push(File.expand_path("#{ENV["HOMEBREW_LIBRARY"]}/Homebrew/test/support/lib"))
 
-require "global"
+require_relative "../global"
 
 require "test/support/no_seed_progress_formatter"
 require "test/support/helper/fixtures"

Library/Homebrew/test/support/helper/spec/shared_context/integration_test.rb

@@ -83,8 +83,7 @@ RSpec.shared_context "integration test" do
     @ruby_args ||= begin
       ruby_args = [
         "-W0",
-        "-I", HOMEBREW_LOAD_PATH,
-        "-rconfig"
+        "-I", $LOAD_PATH.join(File::PATH_SEPARATOR)
       ]
       if ENV["HOMEBREW_TESTS_COVERAGE"]
         simplecov_spec = Gem.loaded_specs["simplecov"]

Library/Homebrew/test/support/lib/config.rb

@@ -13,13 +13,7 @@ TEST_TMPDIR = ENV.fetch("HOMEBREW_TEST_TMPDIR") do |k|
 end
 
 # Paths pointing into the Homebrew code base that persist across test runs
-HOMEBREW_LIBRARY_PATH  = Pathname.new(File.expand_path("../../..", __dir__))
 HOMEBREW_SHIMS_PATH    = HOMEBREW_LIBRARY_PATH.parent/"Homebrew/shims"
-HOMEBREW_LOAD_PATH     = [
-  File.expand_path(__dir__),
-  HOMEBREW_LIBRARY_PATH,
-  HOMEBREW_LIBRARY_PATH/"cask/lib",
-].join(File::PATH_SEPARATOR)
 
 # Paths redirected to a temporary directory and wiped at the end of the test run
 HOMEBREW_PREFIX        = Pathname(TEST_TMPDIR)/"prefix"