brew/Library/Homebrew/global.rb

require 'extend/module'
require 'extend/fileutils'
require 'extend/pathname'
require 'extend/ARGV'
require 'extend/string'
require 'extend/symbol'
require 'extend/enumerable'
require 'os'
require 'utils'
require 'exceptions'
require 'set'
require 'rbconfig'

ARGV.extend(HomebrewArgvExtension)

HOMEBREW_VERSION = '0.9.5'
HOMEBREW_WWW = 'http://brew.sh'

def cache
  if ENV['HOMEBREW_CACHE']
    Pathname.new(ENV['HOMEBREW_CACHE'])
  else
    # we do this for historic reasons, however the cache *should* be the same
    # directory whichever user is used and whatever instance of brew is executed
    home_cache = Pathname.new("~/Library/Caches/Homebrew").expand_path
    if home_cache.directory? and home_cache.writable_real?
      home_cache
    else
      Pathname.new("/Library/Caches/Homebrew").extend Module.new {
        def mkpath
          unless exist?
            super
            chmod 0775
          end
        end
      }
    end
  end
end

HOMEBREW_CACHE = cache
undef cache

# Where brews installed via URL are cached
HOMEBREW_CACHE_FORMULA = HOMEBREW_CACHE+"Formula"

if not defined? HOMEBREW_BREW_FILE
  HOMEBREW_BREW_FILE = ENV['HOMEBREW_BREW_FILE'] || which('brew').to_s
end

# Where we link under
HOMEBREW_PREFIX = Pathname.new(HOMEBREW_BREW_FILE).dirname.parent

# Where .git is found
HOMEBREW_REPOSITORY = Pathname.new(HOMEBREW_BREW_FILE).realpath.dirname.parent

HOMEBREW_LIBRARY = HOMEBREW_REPOSITORY/"Library"
HOMEBREW_CONTRIB = HOMEBREW_REPOSITORY/"Library/Contributions"

# Where we store built products; /usr/local/Cellar if it exists,
# otherwise a Cellar relative to the Repository.
HOMEBREW_CELLAR = if (HOMEBREW_PREFIX+"Cellar").exist?
  HOMEBREW_PREFIX+"Cellar"
else
  HOMEBREW_REPOSITORY+"Cellar"
end

HOMEBREW_LOGS = Pathname.new(ENV['HOMEBREW_LOGS'] || '~/Library/Logs/Homebrew/').expand_path

HOMEBREW_TEMP = Pathname.new(ENV.fetch('HOMEBREW_TEMP', '/tmp'))

if RbConfig.respond_to?(:ruby)
  RUBY_PATH = Pathname.new(RbConfig.ruby)
else
  RUBY_PATH = Pathname.new(RbConfig::CONFIG["bindir"]).join(
    RbConfig::CONFIG["ruby_install_name"] + RbConfig::CONFIG["EXEEXT"]
  )
end
RUBY_BIN = RUBY_PATH.dirname

if RUBY_PLATFORM =~ /darwin/
  MACOS_FULL_VERSION = `/usr/bin/sw_vers -productVersion`.chomp
  MACOS_VERSION = MACOS_FULL_VERSION[/10\.\d+/]
  OS_VERSION = "Mac OS X #{MACOS_FULL_VERSION}"
else
  MACOS_FULL_VERSION = MACOS_VERSION = "0"
  OS_VERSION = RUBY_PLATFORM
end

HOMEBREW_GITHUB_API_TOKEN = ENV["HOMEBREW_GITHUB_API_TOKEN"]
HOMEBREW_USER_AGENT = "Homebrew #{HOMEBREW_VERSION} (Ruby #{RUBY_VERSION}-#{RUBY_PATCHLEVEL}; #{OS_VERSION})"

HOMEBREW_CURL_ARGS = '-f#LA'

require 'tap_constants'

module Homebrew
  include FileUtils
  extend self

  attr_accessor :failed
  alias_method :failed?, :failed
end

HOMEBREW_PULL_OR_COMMIT_URL_REGEX = %r[https://github\.com/([\w-]+)/homebrew(-[\w-]+)?/(?:pull/(\d+)|commit/[0-9a-fA-F]{4,40})]

require 'compat' unless ARGV.include? "--no-compat" or ENV['HOMEBREW_NO_COMPAT']

ORIGINAL_PATHS = ENV['PATH'].split(File::PATH_SEPARATOR).map{ |p| Pathname.new(p).expand_path rescue nil }.compact.freeze