Class: Archive::Tar::Minitar::Command::CommandExtract

Inherits:

CommandPattern

• Object
• CommandPattern
• Archive::Tar::Minitar::Command::CommandExtract

Defined in:

lib/archive/tar/minitar/command.rb

Instance Method Summary

• #altname ⇒ Object
• #call(args, opts = {}, ioe = {}) ⇒ Object
• #help ⇒ Object
• #name ⇒ Object

Methods inherited from CommandPattern

<<, [], #[], add, command, command?, default_ioe

Instance Method Details

#altname ⇒ Object

# File 'lib/archive/tar/minitar/command.rb', line 475

def altname
  "ex"
end

#call(args, opts = {}, ioe = {}) ⇒ Object

# File 'lib/archive/tar/minitar/command.rb', line 479

def call(args, opts = {}, ioe = {})
  argv    = []
  output  = nil
  dest    = "."
  files   = []

  while (arg = args.shift)
    case arg
    when '--uncompress', '-z'
      opts[:uncompress] = true
    when '--pipe'
      opts[:output] = ioe[:error]
      output = ioe[:output]
    when '--output', '-o'
      dest = args.shift
    else
      argv << arg
    end
  end

  if argv.size < 1
    ioe[:output] << "Not enough arguments.\n\n"
    CommandPattern["help"][["extract"]]
    return 255
  end

  input = argv.shift
  if '-' == input
    opts[:name] = "STDIN"
    input = ioe[:input]
  else
    opts[:name] = input
    input = File.open(input, "rb")
  end

  if opts[:name] =~ /\.tar\.gz$|\.tgz$/ or opts[:uncompress]
    input = Zlib::GzipReader.new(input)
  end

  files << argv.to_a
  files.flatten!

  if opts[:verbose]
    watcher = lambda do |action, name, stats|
      opts[:output] << "#{name}\n" if action == :dir or action == :file_done
    end
    finisher = lambda { opts[:output] << "\n" }
  elsif opts[:progress]
    progress = ProgressBar.new(opts[:name], 1)
    watcher = lambda do |action, name, stats|
      case action
      when :file_start, :dir
        progress.title = File.basename(name)
        if action == :dir
          progress.total += 1
          progress.inc
        else
          progress.total += stats[:entry].size
        end
      when :file_progress
        progress.inc(stats[:currinc])
      end
    end
    finisher = lambda do
      progress.title = opts[:name]
      progress.finish
    end
  else
    watcher = nil
    finisher = lambda { }
  end

  if output.nil?
    Archive::Tar::Minitar.unpack(input, dest, files, &watcher)
    finisher.call
  else
    Archive::Tar::Minitar::Input.open(input) do |inp|
      inp.each do |entry|
        stats = {
          :mode     => entry.mode,
          :mtime    => entry.mtime,
          :size     => entry.size,
          :gid      => entry.gid,
          :uid      => entry.uid,
          :current  => 0,
          :currinc  => 0,
          :entry    => entry
        }

        if files.empty? or files.include?(entry.full_name)
          if entry.directory?
            puts "Directory: #{entry.full_name}"
            watcher[:dir, dest, stats] unless watcher.nil?
          else
            puts "File: #{entry.full_name}"
            watcher[:file_start, destfile, stats] unless watcher.nil?
            loop do
              data = entry.read(4096)
              break unless data
              stats[:currinc] = output.write(data)
              stats[:current] += stats[:currinc]

              watcher[:file_progress, name, stats] unless watcher.nil?
            end
            watcher[:file_done, name, stats] unless watcher.nil?
          end
        end
      end
    end
  end

  0
end

#help ⇒ Object

# File 'lib/archive/tar/minitar/command.rb', line 593

def help
  help = <<-EOH
minitar extract [OPTIONS] <tarfile|-> [<file>+]

Extracts files from an existing tarfile. If the tarfile is named .tar.gz
or .tgz, then it will be uncompressed automatically. If the tarfile is
"-", then it will be read from standard input (stdin) so that minitar
may be piped.

The files or directories that will be extracted from the tarfile are
specified after the name of the tarfile itself. Directories will be
processed recursively. Files must be specified in full. A file
"foo/bar/baz.txt" cannot simply be specified by specifying "baz.txt".
Any file not found will simply be skipped and an error will be reported.

extract Options:
--uncompress, -z  Uncompresses the tarfile with gzip.
--pipe            Emits the extracted files to STDOUT for piping.
--output, -o      Extracts the files to the specified directory.

  EOH
end

#name ⇒ Object

# File 'lib/archive/tar/minitar/command.rb', line 471

def name
  "extract"
end