Merge Bundler 2.1.0.pre.1 as developed version from upstream.

  https://github.com/bundler/bundler/commit/a53709556b95a914e874b22ed2116a46b0528852

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@67539 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 12 insertions, 1 deletions

diff --git a/lib/bundler/plugin/index.rb b/lib/bundler/plugin/index.rb
index f09587dfda..faabf3a8d1 100644
--- a/lib/bundler/plugin/index.rb
+++ b/lib/bundler/plugin/index.rb
@@ -58,7 +58,10 @@ module Bundler
         raise SourceConflict.new(name, common) unless common.empty?
         sources.each {|k| @sources[k] = name }
 
-        hooks.each {|e| (@hooks[e] ||= []) << name }
+        hooks.each do |event|
+          event_hooks = (@hooks[event] ||= []) << name
+          event_hooks.uniq!
+        end
 
         @plugin_paths[name] = path
         @load_paths[name] = load_paths
@@ -100,6 +103,14 @@ module Bundler
         @plugin_paths[name]
       end
 
+      def installed_plugins
+        @plugin_paths.keys
+      end
+
+      def plugin_commands(plugin)
+        @commands.find_all {|_, n| n == plugin }.map(&:first)
+      end
+
       def source?(source)
         @sources.key? source
       end