Initial support for gem-uninstall

lib/pry/commands/gem_uninstall.rb

@@ -0,0 +1,28 @@
+class Pry
+  class Command::GemUninstall < Pry::ClassCommand
+    match 'gem-uninstall'
+    group 'Gems'
+    description 'Uninstall a gem and refresh the gem cache.'
+    command_options :argument_required => true
+
+    banner <<-'BANNER'
+      Usage: gem-uninstall GEM_NAME
+
+      Uninstalls the given gem and refreshes the gem cache
+
+      gem-uninstall pry-stack_explorer
+    BANNER
+
+    def setup
+      require 'rubygems/uninstaller' unless defined? Gem::Uninstaller
+    end
+
+    def process(gem)
+      puts "Uninstalling gem #{gem}"
+      Rubygem.uninstall(gem)
+      output.puts "Gem `#{ text.green(gem) }` uninstalled."
+    end
+  end
+
+  Pry::Commands.add_command(Pry::Command::GemUninstall)
+end

lib/pry/rubygem.rb

@@ -76,6 +76,23 @@ class Pry
       else
         Gem.refresh
       end
+
+      # Uninstalls a gem.
+      #
+      # @param [String] name the name of the gem to uninstall
+      #
+      def uninstall(name)
+        uninstaller = Gem::Uninstaller.new(name)
+        uninstaller.uninstall
+      rescue Errno::EACCES
+        raise CommandError,
+          "Insufficient permissions to uninstall #{ Pry::Helpers::Text.green(name) }."
+      rescue Gem::InstallError
+        raise CommandError,
+          "Gem #{ Pry::Helpers::Text.green(name) } is not installed. Aborting uninstallation."
+      else
+        Gem.refresh
+      end
     end
 
   end