show_commands

# File lib/rubygems/commands/help_command.rb, line 320
  def show_commands # :nodoc:
    out = []
    out << "GEM commands are:"
    out << nil

    margin_width = 4

    desc_width = @command_manager.command_names.map { |n| n.size }.max + 4

    summary_width = 80 - margin_width - desc_width
    wrap_indent = ' ' * (margin_width + desc_width)
    format = "#{' ' * margin_width}%-#{desc_width}s%s"

    @command_manager.command_names.each do |cmd_name|
      command = @command_manager[cmd_name]

      summary =
        if command then
          command.summary
        else
          "[No command found for #{cmd_name}]"
        end

      summary = wrap(summary, summary_width).split "\n"
      out << sprintf(format, cmd_name, summary.shift)
      until summary.empty? do
        out << "#{wrap_indent}#{summary.shift}"
      end
    end

    out << nil
    out << "For help on a particular command, use 'gem help COMMAND'."
    out << nil
    out << "Commands may be abbreviated, so long as they are unambiguous."
    out << "e.g. 'gem i rake' is short for 'gem install rake'."

    say out.join("\n")
  end