Implement rudimentary `plugin` command

Add `plugin` command and add `-l` aka `--list` switch to it. It allows
to display the list of all intalled Pry plugins.

Also, change the `PluginManager.show_installed_plugins` method a little
bit: it takes Hash parameter instead of Array one.

Last but not least, adjust `--installed-plugins` switch of Pry to that
method change.

Signed-off-by: Kyrylo Silin <kyrylosilin@gmail.com>

2 files changed, 5 insertions, 5 deletions

diff --git a/lib/pry/cli.rb b/lib/pry/cli.rb
index fe62285e..dc8541e4 100644
--- a/lib/pry/cli.rb
+++ b/lib/pry/cli.rb
@@ -129,7 +129,7 @@ Copyright (c) 2011 John Mair (banisterfiend)
   end
 
   on "installed-plugins", "List installed plugins." do
-    Pry::PluginManager.show_installed_plugins(Pry.locate_plugins)
+    Pry::PluginManager.show_installed_plugins(Pry.plugins)
     exit
   end
 
diff --git a/lib/pry/plugins.rb b/lib/pry/plugins.rb
index 42566a48..397ce95c 100644
--- a/lib/pry/plugins.rb
+++ b/lib/pry/plugins.rb
@@ -62,15 +62,15 @@ class Pry
 
     # Display a list of all installed plugins.
     #
-    # @param [Array<PluginManager::Plugin>] plugins The Array of installed
-    #   plugins.
+    # @param [Hash{String => PluginManager::Plugin}] plugins The Array of
+    #   installed plugins.
     # @param [IO] output The output stream.
     # @return [void]
     def self.show_installed_plugins(plugins, output=Pry.config.output)
       output.puts "Installed Plugins:"
       output.puts "--"
-      plugins.each do |plugin|
-        output.puts "#{ plugin.name }".ljust(18) + plugin.spec.summary
+      plugins.each do |name, plugin|
+        output.puts "#{ name }".ljust(18) + plugin.spec.summary
       end
     end