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Class: Gem::CommandManager

Relationships & Source Files
Super Chains via Extension / Inclusion / Inheritance
Instance Chain:
self, UserInteraction, DefaultUserInteraction, Text
Inherits: Object
Defined in: lib/rubygems/command_manager.rb

Overview

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 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 Command for instructions on writing gem commands.

Class Method Summary

  • .instance

    Return the authoritative instance of the command manager.

  • .new ⇒ CommandManager constructor

    Register all the subcommands supported by the gem command.

  • .reset

    Reset the authoritative instance of the command manager.

Instance Attribute Summary

DefaultUserInteraction - Included

#ui

See DefaultUserInteraction.ui
#ui=

See DefaultUserInteraction.ui=

Instance Method Summary

UserInteraction - Included

#alert

Displays an alert statement.
#alert_error

Displays an error statement to the error output location.
#alert_warning

Displays a warning statement to the warning output location.
#ask

Asks a question and returns the answer.
#ask_for_password

Asks for a password with a prompt
#ask_yes_no

Asks a yes or no question.
#choose_from_list

Asks the user to answer question with an answer from the given list.
#say

Displays the given statement on the standard output (or equivalent).
#terminate_interaction

Terminates the RubyGems process with the given exit_code
#verbose

Calls say with msg or the results of the block if really_verbose is true.

DefaultUserInteraction - Included

#use_ui

See DefaultUserInteraction.use_ui

Text - Included

#clean_text

Remove any non-printable characters and make the text suitable for printing.
#format_text

Wraps text to wrap characters and optionally indents by indent characters.
#levenshtein_distance

This code is based directly on the Text gem implementation Returns a value representing the “cost” of transforming str1 into str2.
#truncate_text

Constructor Details

.new ⇒ CommandManager

Register all the subcommands supported by the gem command.

[ GitHub ] 

  


# File 'lib/rubygems/command_manager.rb', line 98



def initialize
  require 'timeout'
  @commands = {}

  BUILTIN_COMMANDS.each do |name|
    register_command name
  end
end


  







Class Method Details



  

    .instance  
  



  

    

Return the authoritative instance of the command manager.


  



  [ GitHub ]


  

  


# File 'lib/rubygems/command_manager.rb', line 76



def self.instance
  @command_manager ||= new
end


  








  

    .reset  
  



  

    

Reset the authoritative instance of the command manager.


  



  [ GitHub ]


  

  


# File 'lib/rubygems/command_manager.rb', line 91



def self.reset
  @command_manager = nil
end


  







Instance Method Details



  

    #[](command_name)  
  



  

    

Returns a Command instance for command_name


  



  [ GitHub ]


  

  


# File 'lib/rubygems/command_manager.rb', line 124



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.


  



  [ GitHub ]


  

  


# File 'lib/rubygems/command_manager.rb', line 133



def command_names
  @commands.keys.collect {|key| key.to_s}.sort
end


  








  

    #find_command(cmd_name)  
  

  [ GitHub ]


  

  


# File 'lib/rubygems/command_manager.rb', line 175



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)  
  

  [ GitHub ]


  

  


# File 'lib/rubygems/command_manager.rb', line 188



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  
  



  

    

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


  



  [ GitHub ]


  

  


# File 'lib/rubygems/command_manager.rb', line 84



def instance
  self
end


  








  

    #load_and_instantiate(command_name)   (private)
  

  [ GitHub ]


  

  


# File 'lib/rubygems/command_manager.rb', line 200



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


  








  

    #process_args(args, build_args = nil)  
  

  [ GitHub ]


  

  


# File 'lib/rubygems/command_manager.rb', line 152



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 clean_text("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)  
  



  

    

Register the Symbol command as a gem command.


  



  [ GitHub ]


  

  


# File 'lib/rubygems/command_manager.rb', line 110



def register_command(command, obj=false)
  @commands[command] = obj
end


  








  

    #run(args, build_args = nil)  
  



  

    

Run the command specified by args.


  



  [ GitHub ]


  

  


# File 'lib/rubygems/command_manager.rb', line 140



def run(args, build_args=nil)
  process_args(args, build_args)
rescue StandardError, Timeout::Error => ex
  alert_error clean_text("While executing gem ... (#{ex.class})\n    #{ex}")
  ui.backtrace ex

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


  








  

    #unregister_command(command)  
  



  

    

Unregister the Symbol command as a gem command.


  



  [ GitHub ]


  

  


# File 'lib/rubygems/command_manager.rb', line 117



def unregister_command(command)
  @commands.delete command
end