Example

gistfile1.rb

#!/usr/bin/ruby
require 'rubygems'
require 'nokogiri'
require 'open-uri'
require 'image_sorcery'
require 'mini_magick'

# -- Obtain metainfo via 'fetch-ebook-meta'a
#NOTE cover image for books gets saved to the curent working directory of the script.

title = "The Pirate Shark"
ebook_meta = `fetch-ebook-metadata --title "#{title}" --opf metainfo.opf  --cover cover_medium.jpg`
reader  = Nokogiri::XML::Reader(ebook_meta)

# -- Hash to store bookinfo
book_info = Hash.new

reader.each do |node|
	
	# -- Saves description	
	if node.name  == "dc:description" && node.node_type == 1
		book_info["description"] = node.inner_xml
	end
	
	# -- Saves Author
	if node.name == "dc:creator" && node.node_type == 1
		book_info["author"] = node.inner_xml
	end

	# -- Saves publisher
	if node.name == "dc:publisher" && node.node_type == 1
		book_info["publisher"] = node.inner_xml
	end

	# -- Saves date
	if node.name == "dc:date" && node.node_type == 1
		book_info["date"] = node.inner_xml
	end

	#puts node.name, node.inner_xml, node.node_type
end

p book_info 

# -- Converts ebook cover obtained to standard size for index display(cover_thumb.jpg). 
# -- Detail book description (when clicked for more information)will use cover_medium.jpg obtained by default 
puts "Converting images to thumbs size ..."
thumb_image = MiniMagick::Image.open("cover_medium.jpg")
thumb_image.resize "100x120"
thumb_image.write "cover_thumb.jpg"