The command manager registers and installs all the individual sub-commands supported by the gem command.

Extra commands can be provided by writing a rubygems_plugin.rb file in an installed gem. You should register your command against the Gem::CommandManager instance, like this:

# file rubygems_plugin.rb
require 'rubygems/command_manager'

class Gem::Commands::EditCommand < Gem::Command
  # ...
end

Gem::CommandManager.instance.register_command :edit

See Gem::Command for instructions on writing gem commands.

Methods
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Included Modules
Class Public methods
instance()

Return the authoritative instance of the command manager.

Source: show | on GitHub 

# File ../ruby/lib/rubygems/command_manager.rb, line 36
def self.instance
  @command_manager ||= new
end
new()

Register all the subcommands supported by the gem command.

Source: show | on GitHub 

# File ../ruby/lib/rubygems/command_manager.rb, line 50
def initialize
  require 'timeout'
  @commands = {}
  register_command :build
  register_command :cert
  register_command :check
  register_command :cleanup
  register_command :contents
  register_command :dependency
  register_command :environment
  register_command :fetch
  register_command :generate_index
  register_command :help
  register_command :install
  register_command :list
  register_command :lock
  register_command :outdated
  register_command :owner
  register_command :pristine
  register_command :push
  register_command :query
  register_command :rdoc
  register_command :search
  register_command :server
  register_command :sources
  register_command :specification
  register_command :stale
  register_command :uninstall
  register_command :unpack
  register_command :update
  register_command :which
end
reset()

Reset the authoritative instance of the command manager.

Source: show | on GitHub 

# File ../ruby/lib/rubygems/command_manager.rb, line 43
def self.reset
  @command_manager = nil
end
Instance Public methods
[](command_name)

Return the registered command from the command name.

Source: show | on GitHub 

# File ../ruby/lib/rubygems/command_manager.rb, line 100
def [](command_name)
  command_name = command_name.intern
  return nil if @commands[command_name].nil?
  @commands[command_name] ||= load_and_instantiate(command_name)
end
command_names()

Return a sorted list of all command names (as strings).

Source: show | on GitHub 

# File ../ruby/lib/rubygems/command_manager.rb, line 109
def command_names
  @commands.keys.collect {|key| key.to_s}.sort
end
find_command(cmd_name)

Source: show | on GitHub 

# File ../ruby/lib/rubygems/command_manager.rb, line 151
def find_command(cmd_name)
  possibilities = find_command_possibilities cmd_name
  if possibilities.size > 1 then
    raise "Ambiguous command #{cmd_name} matches [#{possibilities.join(', ')}]"
  elsif possibilities.size < 1 then
    raise "Unknown command #{cmd_name}"
  end

  self[possibilities.first]
end
find_command_possibilities(cmd_name)

Source: show | on GitHub 

# File ../ruby/lib/rubygems/command_manager.rb, line 162
def find_command_possibilities(cmd_name)
  len = cmd_name.length

  command_names.select { |n| cmd_name == n[0, len] }
end
process_args(args)

Source: show | on GitHub 

# File ../ruby/lib/rubygems/command_manager.rb, line 128
def process_args(args)
  args = args.to_str.split(/\s+/) if args.respond_to?(:to_str)
  if args.size == 0
    say Gem::Command::HELP
    terminate_interaction(1)
  end
  case args[0]
  when '-h', '--help'
    say Gem::Command::HELP
    terminate_interaction(0)
  when '-v', '--version'
    say Gem::VERSION
    terminate_interaction(0)
  when /^-/
    alert_error "Invalid option: #{args[0]}.  See 'gem --help'."
    terminate_interaction(1)
  else
    cmd_name = args.shift.downcase
    cmd = find_command(cmd_name)
    cmd.invoke(*args)
  end
end
register_command(command)

Register the Symbol command as a gem command.

Source: show | on GitHub 

# File ../ruby/lib/rubygems/command_manager.rb, line 86
def register_command(command)
  @commands[command] = false
end
run(args)

Run the config specified by args.

Source: show | on GitHub 

# File ../ruby/lib/rubygems/command_manager.rb, line 116
def run(args)
  process_args(args)
rescue StandardError, Timeout::Error => ex
  alert_error "While executing gem ... (#{ex.class})\n    #{ex.to_s}"
  ui.errs.puts "\t#{ex.backtrace.join "\n\t"}" if
    Gem.configuration.backtrace
  terminate_interaction(1)
rescue Interrupt
  alert_error "Interrupted"
  terminate_interaction(1)
end
unregister_command(command)

Unregister the Symbol command as a gem command.

Source: show | on GitHub 

# File ../ruby/lib/rubygems/command_manager.rb, line 93
def unregister_command(command)
  @commands.delete command
end
Instance Private methods
load_and_instantiate(command_name)

Source: show | on GitHub 

# File ../ruby/lib/rubygems/command_manager.rb, line 170
def load_and_instantiate(command_name)
  command_name = command_name.to_s
  const_name = command_name.capitalize.gsub(/_(.)/) { $1.upcase } << "Command"
  commands = Gem::Commands
  retried = false

  begin
    commands.const_get(const_name).new
  rescue NameError
    raise if retried

    retried = true
    begin
      require "rubygems/commands/#{command_name}_command"
    rescue Exception => e
      alert_error "Loading command: #{command_name} (#{e.class})\n    #{e}"
      ui.errs.puts "\t#{e.backtrace.join "\n\t"}" if
        Gem.configuration.backtrace
    end
    retry
  end
end