#
# This class compresses/uncompresses a file using Gzip.
#
# Author:: FUJIWARA Teruyoshi <tf (at) dsl.gr.jp>
# Copyright:: Copyright (c) 2010 FUJIWARA Teruyoshi
# License::   Distributes under the same terms as Ruby
# Date:: July 3, 2010
# Version:: 1.0
#
# == Requiremet
# * You need Gzip installed on your PC.
#
class Gzip
  @@cmd_zip = "/usr/bin/gzip"
  @@cmd_unzip = "/usr/bin/gzip -d"
  
  # Compress a file using Gzip
  # === Arguments
  # [path] a file to be compressed.
  # === Return value
  # [true] succeeded
  # [false] failed
  def self.zip(path)
    return action(path, @@cmd_zip)
  end
  
  # Uncompress a compressed file using Gzip
  # === Arguments
  # [path] a file to be uncompressed.
  # === Return value
  # [true] succeeded
  # [false] failed
  def self.unzip(path)
    return action(path, @@cmd_unzip)
  end
  
  # subcontract method for zip, unzip
  # === Arguments
  # [path] a file to be compressed/uncompressed.
  # [cmd] path for zip or unzip command.
  # === Return value
  # [true] succeeded
  # [false] failed
  def self.action(path, cmd)
    if (FileTest.file?(path))
      system("#{cmd} \"#{path}\"")
      return true
    else
      $stderr.puts "Error: #{path} is not a regular file."
      return false
    end
  end
end