Class: ImageGenie::Montage

Inherits:
Command
  • Object
show all
Defined in:
lib/image_genie/montage.rb

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Methods inherited from Command

handle_errors

Constructor Details

#initialize(options = {}) ⇒ Montage

Returns a new instance of Montage.



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# File 'lib/image_genie/montage.rb', line 6

def initialize(options={})
  self.filenames = []
  self.options = options
end

Instance Attribute Details

#filename ⇒ Object

Returns the value of attribute filename.



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# File 'lib/image_genie/montage.rb', line 4

def filename
  @filename
end

#filenames ⇒ Object

Returns the value of attribute filenames.



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# File 'lib/image_genie/montage.rb', line 4

def filenames
  @filenames
end

#options ⇒ Object

Returns the value of attribute options.



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# File 'lib/image_genie/montage.rb', line 4

def options
  @options
end

Class Method Details

.run(filenames, options = {}) ⇒ Object

Raises:



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# File 'lib/image_genie/montage.rb', line 12

def self.run(filenames, options={})
  raise(UnableToLocateBinaryError, 'montage') if path_for(:montage).blank?
  # Montage hates when you attempt to give it files with a path in it, so we
  # need to change to the system specified temp directory to do our work.
  Dir.chdir(Dir::tmpdir)
  # Create a temp file that will be all component files of this montage
  temp_image_file = Tempfile.new(['montage','.jpg'])
  temp_image_list_file = Tempfile.new(['montage_image_filenames','.txt']) 
  temp_image_list_file.puts filenames.join("\n")
  temp_image_list_file.rewind

  logger.info("#{self.name} Attempting to make a montage of #{filenames.size} files")

  command = make_command(path_for(:montage), "@\"#{File.basename(temp_image_list_file.path)}\"", options, "jpeg:-")

  begin
    execute(command) do |pid,stdin,stdout,stderr|
      while !stdout.eof?
        temp_image_file.puts stdout.readline
      end
      temp_image_file.rewind

      # Still foggy on if we need to wait until we read from STDOUT before waiting, or if
      # we wait until we read STDOUT and STDERR.
      ignored, status = Process::waitpid2 pid
      handle_errors(stderr,status,MontageError)
    end
  rescue Exception => e
    # Close the tempfile before raising
    temp_image_file.close
    raise
  ensure
    logger.info("#{self.name} Cleaning up files")
    temp_image_list_file.close
  end

  return temp_image_file

end