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Module: Gem::Util

Relationships & Source Files
Defined in: lib/rubygems/util.rb

Overview

This module contains various utility methods as module methods.

Constant Summary

Class Method Summary

Class Method Details

.gunzip(data)

Zlib::GzipReader wrapper that unzips data.

[ GitHub ] 

  


# File 'lib/rubygems/util.rb', line 12



def self.gunzip(data)
  require 'zlib'
  require 'stringio'
  data = StringIO.new(data, 'r')

  unzipped = Zlib::GzipReader.new(data).read
  unzipped.force_encoding Encoding::BINARY if Object.const_defined? :Encoding
  unzipped
end


  








  

    .gzip(data)  
  



  

    

Zlib::GzipWriter wrapper that zips data.


  



  [ GitHub ]


  

  


# File 'lib/rubygems/util.rb', line 25



def self.gzip(data)
  require 'zlib'
  require 'stringio'
  zipped = StringIO.new(String.new, 'w')
  zipped.set_encoding Encoding::BINARY if Object.const_defined? :Encoding

  Zlib::GzipWriter.wrap zipped do |io| io.write data end

  zipped.string
end


  








  

    .inflate(data)  
  



  

    

A Zlib::Inflate#inflate wrapper


  



  [ GitHub ]


  

  


# File 'lib/rubygems/util.rb', line 39



def self.inflate(data)
  require 'zlib'
  Zlib::Inflate.inflate data
end


  








  

    .popen(*command)  
  



  

    

This calls IO.popen where it accepts an array for a command (Ruby 1.9+) and implements an IO.popen-like behavior where it does not accept an array for a command.


  



  [ GitHub ]


  

  


# File 'lib/rubygems/util.rb', line 49



def self.popen *command
  IO.popen command, &:read
rescue TypeError # ruby 1.8 only supports string command
  r, w = IO.pipe

  pid = fork do
    STDIN.close
    STDOUT.reopen w

    exec(*command)
  end

  w.close

  begin
    return r.read
  ensure
    Process.wait pid
  end
end


  








  

    .silent_system(*command)  
  



  

    

Invokes system, but silences all output.


  



  [ GitHub ]


  

  


# File 'lib/rubygems/util.rb', line 75



def self.silent_system *command
  opt = {:out => NULL_DEVICE, :err => [:child, :out]}
  if Hash === command.last
    opt.update(command.last)
    cmds = command[0...-1]
  else
    cmds = command.dup
  end
  return system(*(cmds << opt))
rescue TypeError
  require 'thread'

  @silent_mutex ||= Mutex.new

  null_device = NULL_DEVICE

  @silent_mutex.synchronize do
    begin
      stdout = STDOUT.dup
      stderr = STDERR.dup

      STDOUT.reopen null_device, 'w'
      STDERR.reopen null_device, 'w'

      return system(*command)
    ensure
      STDOUT.reopen stdout
      STDERR.reopen stderr
      stdout.close
      stderr.close
    end
  end
end


  








  

    .traverse_parents(directory, &block)  
  



  

    

Enumerates the parents of directory.


  



  [ GitHub ]


  

  


# File 'lib/rubygems/util.rb', line 112



def self.traverse_parents directory, &block
  return enum_for __method__, directory unless block_given?

  here = File.expand_path directory
  loop do
    Dir.chdir here, &block rescue Errno::EACCES

    new_here = File.expand_path('..', here)
    return if new_here == here # toplevel
    here = new_here
  end
end