* lib/rubygems: Import RubyGems 2.1

* test/rubygems:  Ditto.


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@41873 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

lib/rubygems/source/local.rb

@@ -0,0 +1,122 @@
+require 'rubygems/source'
+
+class Gem::Source::Local < Gem::Source
+  def initialize
+    @uri = nil
+  end
+
+  ##
+  # Local sorts before Gem::Source and after Gem::Source::Installed
+
+  def <=> other
+    case other
+    when Gem::Source::Installed then
+      -1
+    when Gem::Source::Local then
+      0
+    when Gem::Source then
+      1
+    else
+      nil
+    end
+  end
+
+  def inspect # :nodoc:
+    "#<%s specs: %p>" % [self.class, @specs.keys]
+  end
+
+  def load_specs(type)
+    names = []
+
+    @specs = {}
+
+    Dir["*.gem"].each do |file|
+      begin
+        pkg = Gem::Package.new(file)
+      rescue SystemCallError, Gem::Package::FormatError
+        # ignore
+      else
+        tup = pkg.spec.name_tuple
+        @specs[tup] = [File.expand_path(file), pkg]
+
+        case type
+        when :released
+          unless pkg.spec.version.prerelease?
+            names << pkg.spec.name_tuple
+          end
+        when :prerelease
+          if pkg.spec.version.prerelease?
+            names << pkg.spec.name_tuple
+          end
+        when :latest
+          tup = pkg.spec.name_tuple
+
+          cur = names.find { |x| x.name == tup.name }
+          if !cur
+            names << tup
+          elsif cur.version < tup.version
+            names.delete cur
+            names << tup
+          end
+        else
+          names << pkg.spec.name_tuple
+        end
+      end
+    end
+
+    names
+  end
+
+  def find_gem(gem_name, version=Gem::Requirement.default,
+               prerelease=false)
+    load_specs :complete
+
+    found = []
+
+    @specs.each do |n, data|
+      if n.name == gem_name
+        s = data[1].spec
+
+        if version.satisfied_by?(s.version)
+          if prerelease
+            found << s
+          elsif !s.version.prerelease?
+            found << s
+          end
+        end
+      end
+    end
+
+    found.sort_by { |s| s.version }.last
+  end
+
+  def fetch_spec(name)
+    load_specs :complete
+
+    if data = @specs[name]
+      data.last.spec
+    else
+      raise Gem::Exception, "Unable to find spec for '#{name}'"
+    end
+  end
+
+  def download(spec, cache_dir=nil)
+    load_specs :complete
+
+    @specs.each do |name, data|
+      return data[0] if data[1].spec == spec
+    end
+
+    raise Gem::Exception, "Unable to find file for '#{spec.full_name}'"
+  end
+
+  def pretty_print q # :nodoc:
+    q.group 2, '[Local gems:', ']' do
+      q.breakable
+      q.seplist @specs.keys do |v|
+        q.text v.full_name
+      end
+    end
+  end
+
+end