def add_clear_sources_option

add_option(:"Local/Remote", '--clear-sources',

'Clear the gem sources') do |value, options|

Gem.sources = nil

options[:sources_cleared] = true

end

add_option(:"Local/Remote", '-s', '--source URL', URI::HTTP,

'Append URL to list of remote gem sources') do |source, options|

source << '/' if source !~ /\/\z/

if options.delete :sources_cleared