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Edit File : user_interaction.rb \| Size : 14.64 KB
#-- # Copyright 2006 by Chad Fowler, Rich Kilmer, Jim Weirich and others. # All rights reserved. # See LICENSE.txt for permissions. #++ begin require 'io/console' rescue LoadError end ## # Module that defines the default UserInteraction. Any class including this # module will have access to the +ui+ method that returns the default UI. module Gem::DefaultUserInteraction ## # The default UI is a class variable of the singleton class for this # module. @ui = nil ## # Return the default UI. def self.ui @ui \|\|= Gem::ConsoleUI.new end ## # Set the default UI. If the default UI is never explicitly set, a simple # console based UserInteraction will be used automatically. def self.ui=(new_ui) @ui = new_ui end ## # Use +new_ui+ for the duration of +block+. def self.use_ui(new_ui) old_ui = @ui @ui = new_ui yield ensure @ui = old_ui end ## # See DefaultUserInteraction::ui def ui Gem::DefaultUserInteraction.ui end ## # See DefaultUserInteraction::ui= def ui=(new_ui) Gem::DefaultUserInteraction.ui = new_ui end ## # See DefaultUserInteraction::use_ui def use_ui(new_ui, &block) Gem::DefaultUserInteraction.use_ui(new_ui, &block) end end ## # UserInteraction allows RubyGems to interact with the user through standard # methods that can be replaced with more-specific UI methods for different # displays. # # Since UserInteraction dispatches to a concrete UI class you may need to # reference other classes for specific behavior such as Gem::ConsoleUI or # Gem::SilentUI. # # Example: # # class X # include Gem::UserInteraction # # def get_answer # n = ask("What is the meaning of life?") # end # end module Gem::UserInteraction include Gem::DefaultUserInteraction ## # Displays an alert +statement+. Asks a +question+ if given. def alert statement, question = nil ui.alert statement, question end ## # Displays an error +statement+ to the error output location. Asks a # +question+ if given. def alert_error statement, question = nil ui.alert_error statement, question end ## # Displays a warning +statement+ to the warning output location. Asks a # +question+ if given. def alert_warning statement, question = nil ui.alert_warning statement, question end ## # Asks a +question+ and returns the answer. def ask question ui.ask question end ## # Asks for a password with a +prompt+ def ask_for_password prompt ui.ask_for_password prompt end ## # Asks a yes or no +question+. Returns true for yes, false for no. def ask_yes_no question, default = nil ui.ask_yes_no question, default end ## # Asks the user to answer +question+ with an answer from the given +list+. def choose_from_list question, list ui.choose_from_list question, list end ## # Displays the given +statement+ on the standard output (or equivalent). def say statement = '' ui.say statement end ## # Terminates the RubyGems process with the given +exit_code+ def terminate_interaction exit_code = 0 ui.terminate_interaction exit_code end ## # Calls +say+ with +msg+ or the results of the block if really_verbose # is true. def verbose msg = nil say(msg \|\| yield) if Gem.configuration.really_verbose end end ## # Gem::StreamUI implements a simple stream based user interface. class Gem::StreamUI ## # The input stream attr_reader :ins ## # The output stream attr_reader :outs ## # The error stream attr_reader :errs ## # 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. def initialize(in_stream, out_stream, err_stream=STDERR, usetty=true) @ins = in_stream @outs = out_stream @errs = err_stream @usetty = usetty end ## # Returns true if TTY methods should be used on this StreamUI. def tty? if RUBY_VERSION < '1.9.3' and RUBY_PLATFORM =~ /mingw\|mswin/ then @usetty else @usetty && @ins.tty? end end ## # Prints a formatted backtrace to the errors stream if backtraces are # enabled. def backtrace exception return unless Gem.configuration.backtrace @errs.puts "\t#{exception.backtrace.join "\n\t"}" end ## # 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]. 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 ## # 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. def ask_yes_no(question, default=nil) unless tty? then if default.nil? then 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 ## # Ask a question. Returns an answer if connected to a tty, nil otherwise. def ask(question) return nil if not tty? @outs.print(question + " ") @outs.flush result = @ins.gets result.chomp! if result result end ## # Ask for a password. Does not echo response to terminal. 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 if IO.method_defined?(:noecho) then def _gets_noecho @ins.noecho {@ins.gets} end elsif Gem.win_platform? def _gets_noecho require "Win32API" password = '' while char = Win32API.new("crtdll", "_getch", [ ], "L").Call do break if char == 10 \|\| char == 13 # received carriage return or newline if char == 127 \|\| char == 8 # backspace and delete password.slice!(-1, 1) else password << char.chr end end password end else def _gets_noecho system "stty -echo" begin @ins.gets ensure system "stty echo" end end end ## # Display a statement. def say(statement="") @outs.puts statement end ## # Display an informational alert. Will ask +question+ if it is not nil. def alert(statement, question=nil) @outs.puts "INFO: #{statement}" ask(question) if question end ## # Display a warning on stderr. Will ask +question+ if it is not nil. def alert_warning(statement, question=nil) @errs.puts "WARNING: #{statement}" ask(question) if question end ## # Display an error message in a location expected to get error messages. # Will ask +question+ if it is not nil. def alert_error(statement, question=nil) @errs.puts "ERROR: #{statement}" ask(question) if question end ## # Display a debug message on the same location as error messages. def debug(statement) @errs.puts statement end ## # Terminate the application with exit code +status+, running any exit # handlers that might have been defined. def terminate_interaction(status = 0) close raise Gem::SystemExitException, status end def close end ## # Return a progress reporter object chosen from the current verbosity. def progress_reporter(args) if self.kind_of?(Gem::SilentUI) return SilentProgressReporter.new(@outs, args) end case Gem.configuration.verbose when nil, false SilentProgressReporter.new(@outs, args) when true SimpleProgressReporter.new(@outs, args) else VerboseProgressReporter.new(@outs, args) end end ## # An absolutely silent progress reporter. class SilentProgressReporter ## # The count of items is never updated for the silent progress reporter. attr_reader :count ## # Creates a silent progress reporter that ignores all input arguments. def initialize(out_stream, size, initial_message, terminal_message = nil) end ## # Does not print +message+ when updated as this object has taken a vow of # silence. def updated(message) end ## # Does not print anything when complete as this object has taken a vow of # silence. def done end end ## # A basic dotted progress reporter. class SimpleProgressReporter include Gem::DefaultUserInteraction ## # The number of progress items counted so far. attr_reader :count ## # Creates a new progress reporter that will write to +out_stream+ for # +size+ items. Shows the given +initial_message+ when progress starts # and the +terminal_message+ when it is complete. def initialize(out_stream, size, initial_message, terminal_message = "complete") @out = out_stream @total = size @count = 0 @terminal_message = terminal_message @out.puts initial_message end ## # Prints out a dot and ignores +message+. def updated(message) @count += 1 @out.print "." @out.flush end ## # Prints out the terminal message. def done @out.puts "\n#{@terminal_message}" end end ## # A progress reporter that prints out messages about the current progress. class VerboseProgressReporter include Gem::DefaultUserInteraction ## # The number of progress items counted so far. attr_reader :count ## # Creates a new progress reporter that will write to +out_stream+ for # +size+ items. Shows the given +initial_message+ when progress starts # and the +terminal_message+ when it is complete. def initialize(out_stream, size, initial_message, terminal_message = 'complete') @out = out_stream @total = size @count = 0 @terminal_message = terminal_message @out.puts initial_message end ## # Prints out the position relative to the total and the +message+. def updated(message) @count += 1 @out.puts "#{@count}/#{@total}: #{message}" end ## # Prints out the terminal message. def done @out.puts @terminal_message end end ## # Return a download reporter object chosen from the current verbosity def download_reporter(args) if self.kind_of?(Gem::SilentUI) return SilentDownloadReporter.new(@outs, args) end case Gem.configuration.verbose when nil, false SilentDownloadReporter.new(@outs, args) else VerboseDownloadReporter.new(@outs, args) end end ## # An absolutely silent download reporter. class SilentDownloadReporter ## # The silent download reporter ignores all arguments def initialize(out_stream, args) end ## # The silent download reporter does not display +filename+ or care about # +filesize+ because it is silent. def fetch(filename, filesize) end ## # Nothing can update the silent download reporter. def update(current) end ## # The silent download reporter won't tell you when the download is done. # Because it is silent. def done end end ## # A progress reporter that prints out messages about the current progress. class VerboseDownloadReporter ## # The current file name being displayed attr_reader :file_name ## # The total bytes in the file attr_reader :total_bytes ## # The current progress (0 to 100) attr_reader :progress ## # Creates a new verbose download reporter that will display on # +out_stream+. The other arguments are ignored. def initialize(out_stream, args) @out = out_stream @progress = 0 end ## # Tells the download reporter that the +file_name+ is being fetched and # contains +total_bytes+. def fetch(file_name, total_bytes) @file_name = file_name @total_bytes = total_bytes.to_i @units = @total_bytes.zero? ? 'B' : '%' update_display(false) end ## # Updates the verbose download reporter for the given number of +bytes+. def update(bytes) new_progress = if @units == 'B' then bytes else ((bytes.to_f 100) / total_bytes.to_f).ceil end return if new_progress == @progress @progress = new_progress update_display end ## # Indicates the download is complete. def done @progress = 100 if @units == '%' update_display(true, true) end private def update_display(show_progress = true, new_line = false) # :nodoc: return unless @out.tty? if show_progress then @out.print "\rFetching: %s (%3d%s)" % [@file_name, @progress, @units] else @out.print "Fetching: %s" % @file_name end @out.puts if new_line end end end ## # Subclass of StreamUI that instantiates the user interaction using STDIN, # STDOUT, and STDERR. class Gem::ConsoleUI < Gem::StreamUI ## # The Console UI has no arguments as it defaults to reading input from # stdin, output to stdout and warnings or errors to stderr. def initialize super STDIN, STDOUT, STDERR, true end end ## # SilentUI is a UI choice that is absolutely silent. class Gem::SilentUI < Gem::StreamUI ## # The SilentUI has no arguments as it does not use any stream. def initialize reader, writer = nil, nil begin reader = File.open('/dev/null', 'r') writer = File.open('/dev/null', 'w') rescue Errno::ENOENT reader = File.open('nul', 'r') writer = File.open('nul', 'w') end super reader, writer, writer, false end def close super @ins.close @outs.close end def download_reporter(args) # :nodoc: SilentDownloadReporter.new(@outs, args) end def progress_reporter(args) # :nodoc: SilentProgressReporter.new(@outs, args) end end Back

Edit File : user_interaction.rb | Size : 14.64 KB

#--
# Copyright 2006 by Chad Fowler, Rich Kilmer, Jim Weirich and others.
# All rights reserved.
# See LICENSE.txt for permissions.
#++

begin
  require 'io/console'
rescue LoadError
end

##
# Module that defines the default UserInteraction.  Any class including this
# module will have access to the +ui+ method that returns the default UI.

module Gem::DefaultUserInteraction

##
  # The default UI is a class variable of the singleton class for this
  # module.

@ui = nil

##
  # Return the default UI.

def self.ui
    @ui ||= Gem::ConsoleUI.new
  end

##
  # Set the default UI.  If the default UI is never explicitly set, a simple
  # console based UserInteraction will be used automatically.

def self.ui=(new_ui)
    @ui = new_ui
  end

##
  # Use +new_ui+ for the duration of +block+.

def self.use_ui(new_ui)
    old_ui = @ui
    @ui = new_ui
    yield
  ensure
    @ui = old_ui
  end

##
  # See DefaultUserInteraction::ui

def ui
    Gem::DefaultUserInteraction.ui
  end

##
  # See DefaultUserInteraction::ui=

def ui=(new_ui)
    Gem::DefaultUserInteraction.ui = new_ui
  end

##
  # See DefaultUserInteraction::use_ui

def use_ui(new_ui, &block)
    Gem::DefaultUserInteraction.use_ui(new_ui, &block)
  end

end

##
# UserInteraction allows RubyGems to interact with the user through standard
# methods that can be replaced with more-specific UI methods for different
# displays.
#
# Since UserInteraction dispatches to a concrete UI class you may need to
# reference other classes for specific behavior such as Gem::ConsoleUI or
# Gem::SilentUI.
#
# Example:
#
#   class X
#     include Gem::UserInteraction
#
#     def get_answer
#       n = ask("What is the meaning of life?")
#     end
#   end

module Gem::UserInteraction

include Gem::DefaultUserInteraction

##
  # Displays an alert +statement+.  Asks a +question+ if given.

def alert statement, question = nil
    ui.alert statement, question
  end

##
  # Displays an error +statement+ to the error output location.  Asks a
  # +question+ if given.

def alert_error statement, question = nil
    ui.alert_error statement, question
  end

##
  # Displays a warning +statement+ to the warning output location.  Asks a
  # +question+ if given.

def alert_warning statement, question = nil
    ui.alert_warning statement, question
  end

##
  # Asks a +question+ and returns the answer.

def ask question
    ui.ask question
  end

##
  # Asks for a password with a +prompt+

def ask_for_password prompt
    ui.ask_for_password prompt
  end

##
  # Asks a yes or no +question+.  Returns true for yes, false for no.

def ask_yes_no question, default = nil
    ui.ask_yes_no question, default
  end

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

def choose_from_list question, list
    ui.choose_from_list question, list
  end

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

def say statement = ''
    ui.say statement
  end

##
  # Terminates the RubyGems process with the given +exit_code+

def terminate_interaction exit_code = 0
    ui.terminate_interaction exit_code
  end

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

def verbose msg = nil
    say(msg || yield) if Gem.configuration.really_verbose
  end
end

##
# Gem::StreamUI implements a simple stream based user interface.

class Gem::StreamUI

##
  # The input stream

attr_reader :ins

##
  # The output stream

attr_reader :outs

##
  # The error stream

attr_reader :errs

##
  # 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.

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

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

def tty?
    if RUBY_VERSION < '1.9.3' and RUBY_PLATFORM =~ /mingw|mswin/ then
      @usetty
    else
      @usetty && @ins.tty?
    end
  end

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

def backtrace exception
    return unless Gem.configuration.backtrace

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

##
  # 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].

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

##
  # 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.

def ask_yes_no(question, default=nil)
    unless tty? then
      if default.nil? then
        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

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

def ask(question)
    return nil if not tty?

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

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

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

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

if IO.method_defined?(:noecho) then
    def _gets_noecho
      @ins.noecho {@ins.gets}
    end
  elsif Gem.win_platform?
    def _gets_noecho
      require "Win32API"
      password = ''

while char = Win32API.new("crtdll", "_getch", [ ], "L").Call do
        break if char == 10 || char == 13 # received carriage return or newline
        if char == 127 || char == 8 # backspace and delete
          password.slice!(-1, 1)
        else
          password << char.chr
        end
      end
      password
    end
  else
    def _gets_noecho
      system "stty -echo"
      begin
        @ins.gets
      ensure
        system "stty echo"
      end
    end
  end

##
  # Display a statement.

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

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

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

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

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

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

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

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

def debug(statement)
    @errs.puts statement
  end

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

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

def close
  end

##
  # Return a progress reporter object chosen from the current verbosity.

def progress_reporter(*args)
    if self.kind_of?(Gem::SilentUI)
      return SilentProgressReporter.new(@outs, *args)
    end

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

##
  # An absolutely silent progress reporter.

class SilentProgressReporter

##
    # The count of items is never updated for the silent progress reporter.

attr_reader :count

##
    # Creates a silent progress reporter that ignores all input arguments.

def initialize(out_stream, size, initial_message, terminal_message = nil)
    end

##
    # Does not print +message+ when updated as this object has taken a vow of
    # silence.

def updated(message)
    end

##
    # Does not print anything when complete as this object has taken a vow of
    # silence.

def done
    end
  end

##
  # A basic dotted progress reporter.

class SimpleProgressReporter

include Gem::DefaultUserInteraction

##
    # The number of progress items counted so far.

attr_reader :count

##
    # Creates a new progress reporter that will write to +out_stream+ for
    # +size+ items.  Shows the given +initial_message+ when progress starts
    # and the +terminal_message+ when it is complete.

def initialize(out_stream, size, initial_message,
                   terminal_message = "complete")
      @out = out_stream
      @total = size
      @count = 0
      @terminal_message = terminal_message

@out.puts initial_message
    end

##
    # Prints out a dot and ignores +message+.

def updated(message)
      @count += 1
      @out.print "."
      @out.flush
    end

##
    # Prints out the terminal message.

def done
      @out.puts "\n#{@terminal_message}"
    end

end

##
  # A progress reporter that prints out messages about the current progress.

class VerboseProgressReporter

include Gem::DefaultUserInteraction

##
    # The number of progress items counted so far.

attr_reader :count

def initialize(out_stream, size, initial_message,
                   terminal_message = 'complete')
      @out = out_stream
      @total = size
      @count = 0
      @terminal_message = terminal_message

@out.puts initial_message
    end

##
    # Prints out the position relative to the total and the +message+.

def updated(message)
      @count += 1
      @out.puts "#{@count}/#{@total}: #{message}"
    end

##
    # Prints out the terminal message.

def done
      @out.puts @terminal_message
    end
  end

##
  # Return a download reporter object chosen from the current verbosity

def download_reporter(*args)
    if self.kind_of?(Gem::SilentUI)
      return SilentDownloadReporter.new(@outs, *args)
    end

case Gem.configuration.verbose
    when nil, false
      SilentDownloadReporter.new(@outs, *args)
    else
      VerboseDownloadReporter.new(@outs, *args)
    end
  end

##
  # An absolutely silent download reporter.

class SilentDownloadReporter

##
    # The silent download reporter ignores all arguments

def initialize(out_stream, *args)
    end

##
    # The silent download reporter does not display +filename+ or care about
    # +filesize+ because it is silent.

def fetch(filename, filesize)
    end

##
    # Nothing can update the silent download reporter.

def update(current)
    end

##
    # The silent download reporter won't tell you when the download is done.
    # Because it is silent.

def done
    end
  end

##
  # A progress reporter that prints out messages about the current progress.

class VerboseDownloadReporter

##
    # The current file name being displayed

attr_reader :file_name

##
    # The total bytes in the file

attr_reader :total_bytes

##
    # The current progress (0 to 100)

attr_reader :progress

##
    # Creates a new verbose download reporter that will display on
    # +out_stream+.  The other arguments are ignored.

def initialize(out_stream, *args)
      @out = out_stream
      @progress = 0
    end

##
    # Tells the download reporter that the +file_name+ is being fetched and
    # contains +total_bytes+.

def fetch(file_name, total_bytes)
      @file_name = file_name
      @total_bytes = total_bytes.to_i
      @units = @total_bytes.zero? ? 'B' : '%'

update_display(false)
    end

##
    # Updates the verbose download reporter for the given number of +bytes+.

def update(bytes)
      new_progress = if @units == 'B' then
                       bytes
                     else
                       ((bytes.to_f * 100) / total_bytes.to_f).ceil
                     end

return if new_progress == @progress

@progress = new_progress
      update_display
    end

##
    # Indicates the download is complete.

def done
      @progress = 100 if @units == '%'
      update_display(true, true)
    end

private

def update_display(show_progress = true, new_line = false) # :nodoc:
      return unless @out.tty?

if show_progress then
        @out.print "\rFetching: %s (%3d%s)" % [@file_name, @progress, @units]
      else
        @out.print "Fetching: %s" % @file_name
      end
      @out.puts if new_line
    end
  end
end

##
# Subclass of StreamUI that instantiates the user interaction using STDIN,
# STDOUT, and STDERR.

class Gem::ConsoleUI < Gem::StreamUI

##
  # The Console UI has no arguments as it defaults to reading input from
  # stdin, output to stdout and warnings or errors to stderr.

def initialize
    super STDIN, STDOUT, STDERR, true
  end
end

##
# SilentUI is a UI choice that is absolutely silent.

class Gem::SilentUI < Gem::StreamUI

##
  # The SilentUI has no arguments as it does not use any stream.

def initialize
    reader, writer = nil, nil

begin
      reader = File.open('/dev/null', 'r')
      writer = File.open('/dev/null', 'w')
    rescue Errno::ENOENT
      reader = File.open('nul', 'r')
      writer = File.open('nul', 'w')
    end

super reader, writer, writer, false
  end

def close
    super
    @ins.close
    @outs.close
  end

def download_reporter(*args) # :nodoc:
    SilentDownloadReporter.new(@outs, *args)
  end

def progress_reporter(*args) # :nodoc:
    SilentProgressReporter.new(@outs, *args)
  end
end

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