Gem::PathSupport

    # File lib/rubygems/path_support.rb, line 19
19:   def initialize(env=ENV)
20:     @env = env
21: 
22:     # note 'env' vs 'ENV'...
23:     @home     = env["GEM_HOME"] || ENV["GEM_HOME"] || Gem.default_dir
24: 
25:     if File::ALT_SEPARATOR then
26:       @home   = @home.gsub(File::ALT_SEPARATOR, File::SEPARATOR)
27:     end
28: 
29:     self.path = env["GEM_PATH"] || ENV["GEM_PATH"]
30:   end

    # File lib/rubygems/path_support.rb, line 37
37:   def home=(home)
38:     @home = home.to_s
39:   end

    # File lib/rubygems/path_support.rb, line 44
44:   def path=(gpaths)
45:     gem_path = [@home]
46: 
47:     # FIX: I can't tell wtf this is doing.
48:     gpaths ||= (ENV['GEM_PATH'] || "").empty? ? nil : ENV["GEM_PATH"]
49: 
50:     if gpaths then
51:       if gpaths.kind_of?(Array) then
52:         gem_path.push(*gpaths)
53:       else
54:         gem_path.push(*gpaths.split(File::PATH_SEPARATOR))
55:       end
56: 
57:       if File::ALT_SEPARATOR then
58:         gem_path.map! do |this_path|
59:           this_path.gsub File::ALT_SEPARATOR, File::SEPARATOR
60:         end
61:       end
62:     else
63:       gem_path.push(*Gem.default_path)
64: 
65:       gem_path << APPLE_GEM_HOME if defined?(APPLE_GEM_HOME)
66:     end
67: 
68:     @path = gem_path.uniq
69:   end