class Gem::CommandManager

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'

Gem::CommandManager.instance.register_command :edit

You should put the implementation of your command in rubygems/commands.

# file rubygems/commands/edit_command.rb
class Gem::Commands::EditCommand < Gem::Command
  # ...
end

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

Public Class Methods

instance() click to toggle source

Return the authoritative instance of the command manager.

# File lib/rubygems/command_manager.rb, line 73
def self.instance
  @command_manager ||= new
end

new() click to toggle source

# File lib/rubygems/command_manager.rb, line 95
def initialize
  require 'timeout'
  @commands = {}

  BUILTIN_COMMANDS.each do |name|
    register_command name
  end
end

reset() click to toggle source

Reset the authoritative instance of the command manager.

# File lib/rubygems/command_manager.rb, line 88
def self.reset
  @command_manager = nil
end

Public Instance Methods

[](command_name) click to toggle source

Returns a Command instance for command_name

# File lib/rubygems/command_manager.rb, line 121
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() click to toggle source

Return a sorted list of all command names as strings.

# File lib/rubygems/command_manager.rb, line 130
def command_names
  @commands.keys.collect {|key| key.to_s}.sort
end

find_command(cmd_name) click to toggle source

# File lib/rubygems/command_manager.rb, line 172
def find_command(cmd_name)
  possibilities = find_command_possibilities cmd_name

  if possibilities.size > 1 then
    raise Gem::CommandLineError,
          "Ambiguous command #{cmd_name} matches [#{possibilities.join(', ')}]"
  elsif possibilities.empty? then
    raise Gem::CommandLineError, "Unknown command #{cmd_name}"
  end

  self[possibilities.first]
end

find_command_possibilities(cmd_name) click to toggle source

# File lib/rubygems/command_manager.rb, line 185
def find_command_possibilities(cmd_name)
  len = cmd_name.length

  found = command_names.select { |name| cmd_name == name[0, len] }

  exact = found.find { |name| name == cmd_name }

  exact ? [exact] : found
end

instance() click to toggle source

Returns self. Allows a CommandManager instance to stand in for the class itself.

# File lib/rubygems/command_manager.rb, line 81
def instance
  self
end

process_args(args, build_args=nil) click to toggle source

# File lib/rubygems/command_manager.rb, line 149
def process_args(args, build_args=nil)
  if args.empty? then
    say Gem::Command::HELP
    terminate_interaction 1
  end

  case args.first
  when '-h', '--help' then
    say Gem::Command::HELP
    terminate_interaction 0
  when '-v', '--version' then
    say Gem::VERSION
    terminate_interaction 0
  when /^-/ then
    alert_error "Invalid option: #{args.first}.  See 'gem --help'."
    terminate_interaction 1
  else
    cmd_name = args.shift.downcase
    cmd = find_command cmd_name
    cmd.invoke_with_build_args args, build_args
  end
end

register_command(command, obj=false) click to toggle source

# File lib/rubygems/command_manager.rb, line 107
def register_command(command, obj=false)
  @commands[command] = obj
end

run(args, build_args=nil) click to toggle source

Run the command specified by args.

# File lib/rubygems/command_manager.rb, line 137
def run(args, build_args=nil)
  process_args(args, build_args)
rescue StandardError, Timeout::Error => ex
  alert_error "While executing gem ... (#{ex.class})\n    #{ex}"
  ui.backtrace ex

  terminate_interaction(1)
rescue Interrupt
  alert_error "Interrupted"
  terminate_interaction(1)
end

unregister_command(command) click to toggle source

Unregister the Symbol command as a gem command.

# File lib/rubygems/command_manager.rb, line 114
def unregister_command(command)
  @commands.delete command
end

Private Instance Methods

load_and_instantiate(command_name) click to toggle source

# File lib/rubygems/command_manager.rb, line 197
def load_and_instantiate(command_name)
  command_name = command_name.to_s
  const_name = command_name.capitalize.gsub(/_(.)/) { $1.upcase } << "Command"
  load_error = nil

  begin
    begin
      require "rubygems/commands/#{command_name}_command"
    rescue LoadError => e
      load_error = e
    end
    Gem::Commands.const_get(const_name).new
  rescue Exception => e
    e = load_error if load_error

    alert_error "Loading command: #{command_name} (#{e.class})\n\t#{e}"
    ui.backtrace e
  end
end