Class: Media::LibreMagickTransmogrifier

Inherits:
Transmogrifier show all
Defined in:
lib/media/transmogrifiers/libremagick.rb

Overview

uses libreoffice and graphicsmagick transmogrifiers to convert from office documents to image documents, by way of PDF.

Instance Attribute Summary

Attributes inherited from Transmogrifier

#command_output, #input, #input_file, #input_type, #options, #output, #output_file, #output_type

Class Method Summary collapse

Instance Method Summary collapse

Methods inherited from Transmogrifier

add, command_available?, converts_from?, converts_to?, find_class, inherited, #initialize, input_map, list, output_map, #run_command, run_command

Constructor Details

This class inherits a constructor from Media::Transmogrifier

Class Method Details

.available? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/media/transmogrifiers/libremagick.rb', line 26

def self.available?
  libre &&
    magick &&
    libre.available? &&
    magick.available? &&
    ghostscript_available?
end

.ghostscript_available? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/media/transmogrifiers/libremagick.rb', line 34

def self.ghostscript_available?
  cmd = `which ghostscript`.chomp
  !cmd.empty? && command_available?(cmd)
end

.input_types ⇒ Object 



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# File 'lib/media/transmogrifiers/libremagick.rb', line 17

def self.input_types
  libre.input_types
end

.libre ⇒ Object 



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# File 'lib/media/transmogrifiers/libremagick.rb', line 9

def self.libre
  Media::Transmogrifier.list["Media::LibreOfficeTransmogrifier"]
end

.magick ⇒ Object 



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# File 'lib/media/transmogrifiers/libremagick.rb', line 13

def self.magick
  Media::Transmogrifier.list["Media::GraphicsMagickTransmogrifier"]
end

.output_types ⇒ Object 



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# File 'lib/media/transmogrifiers/libremagick.rb', line 21

def self.output_types
  # we don't want to use this for pdf, since libreoffice by itself can generate pdf
  magick.output_types - ['application/pdf']
end

Instance Method Details

#run(&block) ⇒ Object

run libreoffice and then graphicsmagick in succession.

all the options are passed to graphicsmagic, and none to libreoffice, because they are probably not for libreoffice (like crop or resize).



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# File 'lib/media/transmogrifiers/libremagick.rb', line 45

def run(&block)
  pdf_output_file = Media::TempFile.new(nil, "application/pdf")
  libre_transmog = self.class.libre.new(
    input_file: input_file,       input_type: input_type,
    output_file: pdf_output_file, output_type: "application/pdf")
  status = libre_transmog.run(&block)
  return status if status != :success
  magick_transmog = self.class.magick.new(
    options.merge({
      input_file: pdf_output_file,  input_type: "application/pdf",
      output_file: output_file,     output_type: output_type
    })
  )
  magick_transmog.run(&block)
end