converOreillyEbooks.rb

#!/usr/bin/ruby
require 'tmpdir'

tmpdir = File.join( Dir.tmpdir, 'ipaToEpub' )
Dir.mkdir( tmpdir ) unless File.directory?( tmpdir )
if !File.directory?( tmpdir )
	puts "Error - cannot create temporary directory '#{tmpdir}'!"
	exit
end

Dir.glob( File.expand_path('~/Music/iTunes/iTunes\ Media/Mobile\ Applications') + '/*.ipa' ).each do |file|
	if `unzip -l "#{file}"`.match(%r{(Payload/[^/]+?/book)/OEBPS})
		puts "Extracting contents of #{File.basename(file)} to #{tmpdir}.."
		ebookPath = $1
		`unzip -o "#{file}" "#{ebookPath}/*" -d "#{tmpdir}"`
		zipfileName = File.join( `pwd`.strip, File.basename( file ).gsub('ipa', 'epub') )
		puts "Creating #{zipfileName}";
		`(cd "#{tmpdir}/#{ebookPath}"; zip -r "#{zipfileName}" *)`
		
	end
end