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require 'rexml/parsers/pullparser'
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STYLESHEET = File.expand_path(File.join(File.dirname(__FILE__), '..', '..', "docbook.xsl"))
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CALLOUT_PATH = File.join('images', 'callouts')
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CALLOUT_FULL_PATH = File.expand_path(File.join(File.dirname(__FILE__), '..', '..', '..', CALLOUT_PATH))
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XSLT_PROCESSOR = "xsltproc"
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OUTPUT_DIR = ".epubtmp#{Time.now.to_f.to_s}"
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MIMETYPE = "application/epub+zip"
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attr_reader :output_dir
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def initialize(docbook_file, output_dir=OUTPUT_DIR, css_file=nil, customization_layer=nil, embedded_fonts=[])
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@docbook_file = docbook_file
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@output_dir = output_dir
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@meta_dir = File.join(@output_dir, META_DIR)
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@oebps_dir = File.join(@output_dir, OEBPS_DIR)
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@css_file = css_file ? File.expand_path(css_file) : css_file
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@embedded_fonts = embedded_fonts
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if customization_layer
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@stylesheet = File.expand_path(customization_layer)
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@stylesheet = STYLESHEET
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unless File.exist?(@docbook_file)
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raise ArgumentError.new("File #{@docbook_file} does not exist")
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def render_to_file(output_file, verbose=false)
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render_to_epub(output_file, verbose)
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bundle_epub(output_file, verbose)
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cleanup_files(@to_delete)
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def self.invalid?(file)
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# Obnoxiously, we can't just check for a non-zero output...
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cmd = %Q(#{CHECKER} "#{file}")
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output = `#{cmd} 2>&1`
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STDERR.puts output if $DEBUG
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def render_to_epub(output_file, verbose)
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@collapsed_docbook_file = collapse_docbook()
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chunk_quietly = "--stringparam chunk.quietly " + (verbose ? '0' : '1')
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callout_path = "--stringparam callout.graphics.path #{CALLOUT_PATH}/"
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callout_limit = "--stringparam callout.graphics.number.limit #{CALLOUT_LIMIT}"
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callout_ext = "--stringparam callout.graphics.extension #{CALLOUT_EXT}"
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html_stylesheet = "--stringparam html.stylesheet #{File.basename(@css_file)}" if @css_file
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base = "--stringparam base.dir #{OEBPS_DIR}/"
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unless @embedded_fonts.empty?
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embedded_fonts = @embedded_fonts.map {|f| File.basename(f)}.join(',')
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font = "--stringparam epub.embedded.fonts \"#{embedded_fonts}\""
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meta = "--stringparam epub.metainf.dir #{META_DIR}/"
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oebps = "--stringparam epub.oebps.dir #{OEBPS_DIR}/"
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options = [chunk_quietly,
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# Double-quote stylesheet & file to help Windows cmd.exe
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db2epub_cmd = %Q(cd "#{@output_dir}" && #{XSLT_PROCESSOR} #{options} "#{@stylesheet}" "#{@collapsed_docbook_file}")
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STDERR.puts db2epub_cmd if $DEBUG
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success = system(db2epub_cmd)
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raise "Could not render as .epub to #{output_file} (#{db2epub_cmd})" unless success
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@to_delete << Dir["#{@meta_dir}/*"]
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@to_delete << Dir["#{@oebps_dir}/*"]
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def bundle_epub(output_file, verbose)
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quiet = verbose ? "" : "-q"
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mimetype_filename = write_mimetype()
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meta = File.basename(@meta_dir)
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oebps = File.basename(@oebps_dir)
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images = copy_images()
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callouts = copy_callouts()
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# zip -X -r ../book.epub mimetype META-INF OEBPS
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# Double-quote stylesheet & file to help Windows cmd.exe
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zip_cmd = %Q(cd "#{@output_dir}" && #{ZIPPER} #{quiet} -X -r "#{File.expand_path(output_file)}" "#{mimetype_filename}" "#{meta}" "#{oebps}")
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puts zip_cmd if $DEBUG
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success = system(zip_cmd)
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raise "Could not bundle into .epub file to #{output_file}" unless success
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# Input must be collapsed because REXML couldn't find figures in files that
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# were XIncluded or added by ENTITY
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# http://sourceforge.net/tracker/?func=detail&aid=2750442&group_id=21935&atid=373747
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# Double-quote stylesheet & file to help Windows cmd.exe
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collapsed_file = File.join(File.expand_path(File.dirname(@docbook_file)),
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'.collapsed.' + File.basename(@docbook_file))
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entity_collapse_command = %Q(xmllint --loaddtd --noent -o "#{collapsed_file}" "#{@docbook_file}")
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entity_success = system(entity_collapse_command)
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raise "Could not collapse named entites in #{@docbook_file}" unless entity_success
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xinclude_collapse_command = %Q(xmllint --xinclude -o "#{collapsed_file}" "#{collapsed_file}")
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xinclude_success = system(xinclude_collapse_command)
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raise "Could not collapse XIncludes in #{@docbook_file}" unless xinclude_success
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@to_delete << collapsed_file
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return collapsed_file
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new_callout_images = []
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calloutglob = "#{CALLOUT_FULL_PATH}/*#{CALLOUT_EXT}"
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Dir.glob(calloutglob).each {|img|
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img_new_filename = File.join(@oebps_dir, CALLOUT_PATH, File.basename(img))
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# TODO: What to rescue for these two?
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FileUtils.mkdir_p(File.dirname(img_new_filename))
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FileUtils.cp(img, img_new_filename)
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@to_delete << img_new_filename
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new_callout_images << img
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return new_callout_images
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@embedded_fonts.each {|font_file|
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font_new_filename = File.join(@oebps_dir, File.basename(font_file))
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FileUtils.cp(font_file, font_new_filename)
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new_fonts << font_file
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css_new_filename = File.join(@oebps_dir, File.basename(@css_file))
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FileUtils.cp(@css_file, css_new_filename)
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image_references = get_image_refs()
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image_references.each {|img|
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# TODO: It'd be cooler if we had a filetype lookup rather than just
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if img =~ /\.(svg|png|gif|jpe?g|xml)/i
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img_new_filename = File.join(@oebps_dir, img)
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img_full = File.join(File.expand_path(File.dirname(@docbook_file)), img)
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# TODO: What to rescue for these two?
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FileUtils.mkdir_p(File.dirname(img_new_filename))
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puts(img_full + ": " + img_new_filename) if $DEBUG
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FileUtils.cp(img_full, img_new_filename)
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@to_delete << img_new_filename
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new_images << img_full
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mimetype_filename = File.join(@output_dir, "mimetype")
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File.open(mimetype_filename, "w") {|f| f.print MIMETYPE}
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@to_delete << mimetype_filename
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return File.basename(mimetype_filename)
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def cleanup_files(file_list)
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file_list.flatten.each {|f|
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FileUtils.rm_r(f, :force => true )
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# Returns an Array of all of the (image) @filerefs in a document
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parser = REXML::Parsers::PullParser.new(File.new(@collapsed_docbook_file))
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while parser.has_next?
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if el.start_element? and (el[0] == "imagedata" or el[0] == "graphic")
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image_refs << el[1]['fileref']
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return image_refs.uniq
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# Returns true if the document has code callouts
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parser = REXML::Parsers::PullParser.new(File.new(@collapsed_docbook_file))
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while parser.has_next?
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if el.start_element? and (el[0] == "calloutlist" or el[0] == "co")