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##
# This module contains various utility methods as module methods.
module Gem::Util
@silent_mutex = nil
##
# Zlib::GzipReader wrapper that unzips +data+.
def self.gunzip(data)
require 'zlib'
require 'rubygems/util/stringio'
data = Gem::StringSource.new data
unzipped = Zlib::GzipReader.new(data).read
unzipped.force_encoding Encoding::BINARY if Object.const_defined? :Encoding
unzipped
end
##
# Zlib::GzipWriter wrapper that zips +data+.
def self.gzip(data)
require 'zlib'
require 'rubygems/util/stringio'
zipped = Gem::StringSink.new
zipped.set_encoding Encoding::BINARY if Object.const_defined? :Encoding
Zlib::GzipWriter.wrap zipped do |io| io.write data end
zipped.string
end
##
# A Zlib::Inflate#inflate wrapper
def self.inflate(data)
require 'zlib'
Zlib::Inflate.inflate data
end
##
# 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.
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
##
# Invokes system, but silences all output.
def self.silent_system *command
require 'thread'
@silent_mutex ||= Mutex.new
null_device = Gem.win_platform? ? 'NUL' : '/dev/null'
@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
end
end
end
##
# Enumerates the parents of +directory+.
def self.traverse_parents directory
return enum_for __method__, directory unless block_given?
here = File.expand_path directory
start = here
Dir.chdir start
begin
loop do
yield here
Dir.chdir '..'
return if Dir.pwd == here # toplevel
here = Dir.pwd
end
ensure
Dir.chdir start
end
end
end
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