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Class: Gem::Commands::HelpCommand

Relationships & Source Files
Super Chains via Extension / Inclusion / Inheritance
Class Chain:
self, ::Gem::Command
Instance Chain:
self, ::Gem::Command, ::Gem::UserInteraction, ::Gem::DefaultUserInteraction
Inherits: Gem::Command
Defined in: lib/rubygems/commands/help_command.rb

Class Attribute Summary

::Gem::Command - Inherited

.build_args

Arguments used when building gems.
.build_args=, .extra_args, .extra_args=

Class Method Summary

::Gem::Command - Inherited

.add_common_option,
.add_specific_extra_args

Add a list of extra arguments for the given command.
.common_options,
.new

Initializes a generic gem command named command.
.specific_extra_args

Return an array of extra arguments for the command.
.specific_extra_args_hash

Accessor for the specific extra args hash (self initializing).

Instance Attribute Summary

::Gem::Command - Inherited

#defaults

The default options for the command.
#program_name

The name of the command for command-line invocation.
#summary

A short description of the command.
#command

The name of the command.
#options

The options for the command.

::Gem::DefaultUserInteraction - Included

#ui

See DefaultUserInteraction.ui
#ui=

See DefaultUserInteraction.ui=

Instance Method Summary

::Gem::Command - Inherited

#add_extra_args

Adds extra args from ~/.gemrc.
#add_option

Add a command-line option and handler to the command.
#arguments

Override to provide details of the arguments a command takes.
#begins?

True if long begins with the characters from short.
#defaults_str

Override to display the default values of the command options.
#description

Override to display a longer description of what this command does.
#execute

Override to provide command handling.
#get_all_gem_names

Get all gem names from the command line.
#get_all_gem_names_and_versions

Get all [gem, version] from the command line.
#get_one_gem_name

Get a single gem name from the command line.
#get_one_optional_argument

Get a single optional argument from the command line.
#handle_options

Handle the given list of arguments by parsing them and recording the results.
#handles?

True if the command handles the given argument list.
#invoke

Invoke the command with the given list of arguments.
#invoke_with_build_args

Invoke the command with the given list of normal arguments and additional build arguments.
#merge_options

Merge a set of command options with the set of default options (without modifying the default option hash).
#remove_option

Remove previously defined command-line argument name.
#show_help

Display the help message for the command.
#show_lookup_failure

Display to the user that a gem couldn't be found and reasons why.
#usage

Override to display the usage for an individual gem command.
#when_invoked

Call the given block when invoked.
#add_parser_run_info

Adds a section with title and content to the parser help view.
#configure_options,
#create_option_parser

Creates an option parser and fills it in with the help info for the command.
#parser

Create on demand parser.
#wrap

Wraps text to width

::Gem::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.

::Gem::DefaultUserInteraction - Included

#use_ui

See DefaultUserInteraction.use_ui

Constructor Details

.new ⇒ HelpCommand

[ GitHub ] 

  


# File 'lib/rubygems/commands/help_command.rb', line 282



def initialize
  super 'help', "Provide help on the 'gem' command"

  @command_manager = Gem::CommandManager.instance
end


  







Instance Method Details



  

    #execute  
  

  [ GitHub ]


  

  


# File 'lib/rubygems/commands/help_command.rb', line 292



def execute
  arg = options[:args][0]

  _, help = SUBCOMMANDS.find do |command,|
    begins? command, arg
  end

  if help then
    if Symbol === help then
      send help
    else
      say help
    end
    return
  end

  if options[:help] then
    show_help

  elsif arg then
    show_command_help arg

  else
    say Gem::Command::HELP
  end
end