Opening EPUB file to handle

.gitignore

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+*.gem
+.bundle
+Gemfile.lock
+pkg/*

.rspec

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+--color
+--format nested

Gemfile

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+source "http://rubygems.org"
+
+gemspec
+
+group :development, :test do
+  gem "rspec"
+end

Rakefile

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+require 'bundler/gem_tasks'

epub-reader.gemspec

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+# -*- encoding: utf-8 -*-
+$:.push File.expand_path("../lib", __FILE__)
+require "epub-reader/version"
+
+Gem::Specification.new do |s|
+  s.name        = "epub-reader"
+  s.version     = Epub::Reader::VERSION
+  s.authors     = ["Fernando Almeida"]
+  s.email       = ["fernando@fernandoalmeida.net"]
+  s.homepage    = "http://bitbucket.com/fernandoalmeida/epub-reader"
+  s.summary     = "A library for accessing the content of EPUB files"
+  s.description = "The epub-reader library implements a EPUB parser conforming as much as possible to the EPUB 3 specification from IDPF"
+
+  s.rubyforge_project = "epub-reader"
+
+  s.files         = `git ls-files`.split("\n")
+  s.test_files    = `git ls-files -- {test,spec,features}/*`.split("\n")
+  s.executables   = `git ls-files -- bin/*`.split("\n").map{ |f| File.basename(f) }
+  s.require_paths = ["lib"]
+
+  s.add_dependency('rubyzip')
+end

lib/epub-reader.rb

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+require "epub-reader/version"
+require "epub-reader/reader"
+
+module Epub
+  class FileNotFoundError < StandardError; end
+end

lib/epub-reader/reader.rb

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+require 'zip/zipfilesystem'
+
+module Epub
+  class Reader
+
+    attr_reader :filename, :file
+
+    def initialize(file)
+      raise FileNotFoundError unless File.exists?(file)
+      @filename  = file
+      @file      = Zip::ZipFile.open(file)
+    end
+
+    def Reader.open(file)
+      reader = Reader.new(file)
+      if block_given?
+          yield reader
+      else
+        reader
+      end
+    end
+
+  end
+end

lib/epub-reader/version.rb

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+module Epub
+  class Reader
+    VERSION = "0.0.1"
+  end
+end

spec/reader_spec.rb

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+require 'spec_helper'
+
+describe Epub::Reader do
+
+  before(:all) do
+    @epub = Epub::Reader.open('spec/data/valid.epub')
+  end
+
+  it 'should open a epub file' do
+    @epub.should_not be_nil
+  end
+
+  it 'should raise exception if file not found' do
+    lambda { Epub::Reader.open('not_found.epub') }.should raise_error
+  end
+
+  it 'should have the epub file to handle' do
+    @epub.file.should_not be_nil
+  end
+
+end

spec/spec_helper.rb

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+$: << File.join(File.dirname(__FILE__), "/../lib")
+
+require "rspec"
+require "epub-reader"
+
+RSpec.configure do |c|
+  c.mock_with :rspec
+end