# module Gem::Util

This module contains various utility methods as module methods.

### Public Class Methods

correct_for_windows_path (path)
Source

    # File lib/rubygems/util.rb, line 111
    def self.correct_for_windows_path(path)
      if path[0].chr == "/" && path[1].chr.match?(/[a-z]/i) && path[2].chr == ":"
        path[1..-1]
      else
        path
      end
    end

Corrects `path` (usually returned by ‘Gem::URI.parse().path` on Windows), that comes with a leading slash.

glob_files_in_dir (glob, base_path)
Source

    # File lib/rubygems/util.rb, line 103
    def self.glob_files_in_dir(glob, base_path)
      Dir.glob(glob, base: base_path).map! {|f| File.expand_path(f, base_path) }
    end

Globs for files matching `pattern` inside of `directory`, returning absolute paths to the matching files.

gunzip (data)
Source

    # File lib/rubygems/util.rb, line 12
    def self.gunzip(data)
      require "zlib"
      require "stringio"
      data = StringIO.new(data, "r")

      gzip_reader = begin
                      Zlib::GzipReader.new(data)
                    rescue Zlib::GzipFile::Error => e
                      raise e.class, e.inspect, e.backtrace
                    end

      unzipped = gzip_reader.read
      unzipped.force_encoding Encoding::BINARY
      unzipped
    end

`Zlib::GzipReader` wrapper that unzips `data`.

gzip (data)
Source

    # File lib/rubygems/util.rb, line 31
    def self.gzip(data)
      require "zlib"
      require "stringio"
      zipped = StringIO.new(String.new, "w")
      zipped.set_encoding Encoding::BINARY

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

      zipped.string
    end

`Zlib::GzipWriter` wrapper that zips `data`.

inflate (data)
Source

    # File lib/rubygems/util.rb, line 47
    def self.inflate(data)
      require "zlib"
      Zlib::Inflate.inflate data
    end

A `Zlib::Inflate#inflate` wrapper

popen (*command)
Source

    # File lib/rubygems/util.rb, line 55
    def self.popen(*command)
      IO.popen command, &:read
    end

This calls `IO.popen` and reads the result

silent_system (*command)
Source

    # File lib/rubygems/util.rb, line 62
    def self.silent_system(*command)
      opt = { out: IO::NULL, err: [:child, :out] }
      if Hash === command.last
        opt.update(command.last)
        cmds = command[0...-1]
      else
        cmds = command.dup
      end
      system(*(cmds << opt))
    end

Invokes system, but silences all output.

traverse_parents (directory, &block)
Source

    # File lib/rubygems/util.rb, line 82
    def self.traverse_parents(directory, &block)
      return enum_for __method__, directory unless block_given?

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

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

Enumerates the parents of `directory`.