class Pry class Command::GemList < Pry::ClassCommand match 'gem-list' group 'Gems' description 'List and search installed gems.' banner <<-'BANNER' Usage: gem-list [REGEX] List all installed gems, when a regex is provided, limit the output to those that match the regex. BANNER def process(pattern = nil) pattern = Regexp.compile(pattern || '') gems = Rubygem.list(pattern).group_by(&:name) gems.each do |gem, specs| specs.sort! do |a,b| Gem::Version.new(b.version) <=> Gem::Version.new(a.version) end versions = specs.each_with_index.map do |spec, index| index == 0 ? text.bright_green(spec.version.to_s) : text.green(spec.version.to_s) end output.puts "#{text.default gem} (#{versions.join ', '})" end end end Pry::Commands.add_command(Pry::Command::GemList) end