1 files changed, 78 insertions, 0 deletions
diff --git a/lib/rubygems/path_support.rb b/lib/rubygems/path_support.rb
new file mode 100644
index 0000000000..0809f8ab40
--- /dev/null
+++ b/lib/rubygems/path_support.rb
@@ -0,0 +1,78 @@
+######################################################################
+# This file is imported from the rubygems project.
+# DO NOT make modifications in this repo. They _will_ be reverted!
+# File a patch instead and assign it to Ryan Davis or Eric Hodel.
+######################################################################
+
+##
+#
+# Gem::PathSupport facilitates the GEM_HOME and GEM_PATH environment settings
+# to the rest of RubyGems.
+#
+class Gem::PathSupport
+  ##
+  # The default system path for managing Gems.
+  attr_reader :home
+
+  ##
+  # Array of paths to search for Gems.
+  attr_reader :path
+
+  ##
+  #
+  # Constructor. Takes a single argument which is to be treated like a
+  # hashtable, or defaults to ENV, the system environment.
+  #
+  def initialize(env=ENV)
+    @env = env
+
+    # note 'env' vs 'ENV'...
+    @home     = env["GEM_HOME"] || ENV["GEM_HOME"] || Gem.default_dir
+    self.path = env["GEM_PATH"] || ENV["GEM_PATH"]
+  end
+
+  private
+
+  ##
+  # Set the Gem home directory (as reported by Gem.dir).
+
+  def home=(home)
+    @home = home.to_s
+  end
+
+  ##
+  # Set the Gem search path (as reported by Gem.path).
+
+  def path=(gpaths)
+    # FIX: it should be [home, *path], not [*path, home]
+
+    gem_path = []
+
+    # FIX: I can't tell wtf this is doing.
+    gpaths ||= (ENV['GEM_PATH'] || "").empty? ? nil : ENV["GEM_PATH"]
+
+    if gpaths
+      if gpaths.kind_of?(Array)
+        gem_path = gpaths.dup
+      else
+        gem_path = gpaths.split(File::PATH_SEPARATOR)
+      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 = Gem.default_path + [@home]
+
+      if defined?(Gem::APPLE_GEM_HOME)
+        gem_path << Gem::APPLE_GEM_HOME
+      end
+    end
+
+    @path = gem_path.uniq
+  end
+end