# class Gem::PathSupport

Gem::PathSupport facilitates the GEM_HOME and GEM_PATH environment settings to the rest of RubyGems.

### Attributes

home[R]

The default system path for managing Gems.

path[R]

Array of paths to search for Gems.

### Public Class Methods

new(env) click to toggle source

Constructor. Takes a single argument which is to be treated like a hashtable, or defaults to ENV, the system environment.

    # File lib/rubygems/path_support.rb, line 24
    def initialize(env)
      @home     = env["GEM_HOME"] || Gem.default_dir

      if File::ALT_SEPARATOR then
        @home   = @home.gsub(File::ALT_SEPARATOR, File::SEPARATOR)
      end

      @path = split_gem_path env["GEM_PATH"], @home

      @spec_cache_dir = env["GEM_SPEC_CACHE"] || Gem.default_spec_cache_dir

      @spec_cache_dir = @spec_cache_dir.dup.untaint
    end

### Private Instance Methods

default_path() click to toggle source

Return the default Gem path

    # File lib/rubygems/path_support.rb, line 71
    def default_path
      gem_path = Gem.default_path + [@home]

      if defined?(APPLE_GEM_HOME)
        gem_path << APPLE_GEM_HOME
      end
      gem_path
    end

split_gem_path(gpaths, home) click to toggle source

Split the Gem search path (as reported by Gem.path).

    # File lib/rubygems/path_support.rb, line 43
    def split_gem_path gpaths, home
      # FIX: it should be [home, *path], not [*path, home]

      gem_path = []

      if gpaths
        gem_path = gpaths.split(Gem.path_separator)
        # Handle the path_separator being set to a regexp, which will cause
        # end_with? to error
        if gpaths =~ /#{Gem.path_separator}\z/
          gem_path += default_path
        end

        if File::ALT_SEPARATOR then
          gem_path.map! do |this_path|
            this_path.gsub File::ALT_SEPARATOR, File::SEPARATOR
          end
        end

        gem_path << home
      else
        gem_path = default_path
      end

      gem_path.uniq
    end