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Class: Gem::StreamUI

Relationships & Source Files
Namespace Children
Classes:
SilentDownloadReporter, SilentProgressReporter, SimpleProgressReporter, ThreadedDownloadReporter, VerboseProgressReporter
Extension / Inclusion / Inheritance Descendants
Subclasses:
ConsoleUI, MockGemUi, SilentUI
Super Chains via Extension / Inclusion / Inheritance
Class Chain:
self, Deprecate
Inherits: Object
Defined in: lib/rubygems/user_interaction.rb

Overview

StreamUI implements a simple stream based user interface.

Class Method Summary

Deprecate - Extended

deprecate

Simple deprecation method that deprecates name by wrapping it up in a dummy method.
skip_during

Temporarily turn off warnings.

Instance Attribute Summary

  • #errs readonly

    The error stream.

  • #ins readonly

    The input stream.

  • #outs readonly

    The output stream.

  • #tty? ⇒ Boolean readonly

    Returns true if TTY methods should be used on this StreamUI.

Instance Method Summary

Constructor Details

.new(in_stream, out_stream, err_stream = STDERR, usetty = true) ⇒ StreamUI

Creates a new StreamUI wrapping in_stream for user input, out_stream for standard output, err_stream for error output. If usetty is true then special operations (like asking for passwords) will use the TTY commands to disable character echo.

[ GitHub ] 

  


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



def initialize(in_stream, out_stream, err_stream=STDERR, usetty=true)
  @ins = in_stream
  @outs = out_stream
  @errs = err_stream
  @usetty = usetty
end


  







Instance Attribute Details



  

    #errs   (readonly)
  



  

    

The error stream


  



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# File 'lib/rubygems/user_interaction.rb', line 192



attr_reader :errs


  








  

    #ins   (readonly)
  



  

    

The input stream


  



  [ GitHub ]


  

  


# File 'lib/rubygems/user_interaction.rb', line 182



attr_reader :ins


  








  

    #outs   (readonly)
  



  

    

The output stream


  



  [ GitHub ]


  

  


# File 'lib/rubygems/user_interaction.rb', line 187



attr_reader :outs


  








  

    #tty?  ⇒ Boolean  (readonly)
  



  

    

Returns true if TTY methods should be used on this StreamUI.


  





  


  [ GitHub ]


  

  


# File 'lib/rubygems/user_interaction.rb', line 210



def tty?
  @usetty && @ins.tty?
end


  







Instance Method Details



  

    #_gets_noecho  
  

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# File 'lib/rubygems/user_interaction.rb', line 324



def _gets_noecho
  require_io_console
  @ins.noecho {@ins.gets}
end


  








  

    #alert(statement, question = nil)  
  



  

    

Display an informational alert.  Will ask question if it is not nil.


  



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# File 'lib/rubygems/user_interaction.rb', line 339



def alert(statement, question=nil)
  @outs.puts "INFO:  #{statement}"
  ask(question) if question
end


  








  

    #alert_error(statement, question = nil)  
  



  

    

Display an error message in a location expected to get error messages. Will ask question if it is not nil.


  



  [ GitHub ]


  

  


# File 'lib/rubygems/user_interaction.rb', line 356



def alert_error(statement, question=nil)
  @errs.puts "ERROR:  #{statement}"
  ask(question) if question
end


  








  

    #alert_warning(statement, question = nil)  
  



  

    

Display a warning on stderr.  Will ask question if it is not nil.


  



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# File 'lib/rubygems/user_interaction.rb', line 347



def alert_warning(statement, question=nil)
  @errs.puts "WARNING:  #{statement}"
  ask(question) if question
end


  








  

    #ask(question)  
  



  

    

Ask a question.  Returns an answer if connected to a tty, nil otherwise.


  



  [ GitHub ]


  

  


# File 'lib/rubygems/user_interaction.rb', line 288



def ask(question)
  return nil if not tty?

  @outs.print(question + "  ")
  @outs.flush

  result = @ins.gets
  result.chomp! if result
  result
end


  








  

    #ask_for_password(question)  
  



  

    

Ask for a password. Does not echo response to terminal.


  



  [ GitHub ]


  

  


# File 'lib/rubygems/user_interaction.rb', line 302



def ask_for_password(question)
  return nil if not tty?

  @outs.print(question, "  ")
  @outs.flush

  password = _gets_noecho
  @outs.puts
  password.chomp! if password
  password
end


  








  

    #ask_yes_no(question, default = nil)  
  



  

    

Ask a question.  Returns a true for yes, false for no.  If not connected to a tty, raises an exception if default is nil, otherwise returns default.


  



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# File 'lib/rubygems/user_interaction.rb', line 252



def ask_yes_no(question, default=nil)
  unless tty?
    if default.nil?
      raise Gem::OperationNotSupportedError,
            "Not connected to a tty and no default specified"
    else
      return default
    end
  end

  default_answer = case default
                   when nil
                     'yn'
                   when true
                     'Yn'
                   else
                     'yN'
                   end

  result = nil

  while result.nil? do
    result = case ask "#{question} [#{default_answer}]"
             when /^y/i then true
             when /^n/i then false
             when /^$/  then default
             else            nil
             end
  end

  return result
end


  








  

    #backtrace(exception)  
  



  

    

Prints a formatted backtrace to the errors stream if backtraces are enabled.


  



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# File 'lib/rubygems/user_interaction.rb', line 218



def backtrace(exception)
  return unless Gem.configuration.backtrace

  @errs.puts "\t#{exception.backtrace.join "\n\t"}"
end


  








  

    #choose_from_list(question, list)  
  



  

    

Choose from a list of options.  question is a prompt displayed above the list.  list is a list of option strings.  Returns the pair [option_name, option_index].


  



  [ GitHub ]


  

  


# File 'lib/rubygems/user_interaction.rb', line 229



def choose_from_list(question, list)
  @outs.puts question

  list.each_with_index do |item, index|
    @outs.puts " #{index+1}. #{item}"
  end

  @outs.print "> "
  @outs.flush

  result = @ins.gets

  return nil, nil unless result

  result = result.strip.to_i - 1
  return list[result], result
end


  








  

    #close  
  

  [ GitHub ]


  

  


# File 'lib/rubygems/user_interaction.rb', line 378



def close
end


  








  

    #debug(statement)  
  



  

    

Display a debug message on the same location as error messages.


  



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# File 'lib/rubygems/user_interaction.rb', line 364



def debug(statement)
  @errs.puts statement
end


  








  

    #download_reporter(*args)  
  



  

    

Return a download reporter object chosen from the current verbosity


  



  [ GitHub ]


  

  


# File 'lib/rubygems/user_interaction.rb', line 517



def download_reporter(*args)
  if [nil, false].include?(Gem.configuration.verbose) || !@outs.tty?
    SilentDownloadReporter.new(@outs, *args)
  else
    ThreadedDownloadReporter.new(@outs, *args)
  end
end


  








  

    #progress_reporter(*args)  
  



  

    

Return a progress reporter object chosen from the current verbosity.


  



  [ GitHub ]


  

  


# File 'lib/rubygems/user_interaction.rb', line 384



def progress_reporter(*args)
  case Gem.configuration.verbose
  when nil, false
    SilentProgressReporter.new(@outs, *args)
  when true
    SimpleProgressReporter.new(@outs, *args)
  else
    VerboseProgressReporter.new(@outs, *args)
  end
end


  








  

    #require_io_console  
  

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# File 'lib/rubygems/user_interaction.rb', line 314



def require_io_console
  @require_io_console ||= begin
    begin
      require 'io/console'
    rescue LoadError
    end
    true
  end
end


  








  

    #say(statement = "")  
  



  

    

Display a statement.


  



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# File 'lib/rubygems/user_interaction.rb', line 332



def say(statement="")
  @outs.puts statement
end


  








  

    #terminate_interaction(status = 0)  
  



  

    

Terminate the application with exit code status, running any exit handlers that might have been defined.


  





  
Raises:





  [ GitHub ]


  

  


# File 'lib/rubygems/user_interaction.rb', line 373



def terminate_interaction(status = 0)
  close
  raise Gem::SystemExitException, status
end