95 lines
2.9 KiB
Ruby
95 lines
2.9 KiB
Ruby
require 'tempfile'
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require 'fileutils'
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require 'digest/md5'
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require 'pstore'
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require 'nokogiri'
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module MaRuKu
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module Out
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module HTML
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PNG = Struct.new(:src, :depth, :height)
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def convert_to_png_blahtex(kind, tex)
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FileUtils.mkdir_p get_setting(:html_png_dir)
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# first, we check whether this image has already been processed
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md5sum = Digest::MD5.hexdigest(tex + " params: ")
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result_file = File.join(get_setting(:html_png_dir), md5sum + ".txt")
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if not File.exists?(result_file)
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Tempfile.open('maruku_blahtex') do |tmp_in|
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tmp_in.write tex
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tmp_in.close
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# It's important taht we don't replace *all* newlines,
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# because newlines in arguments get escaped as "'\n'".
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system <<COMMAND.gsub("\n ", " ")
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blahtex --png --use-preview-package
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--shell-dvipng #{shellescape("dvipng -D #{shellescape(get_setting(:html_png_resolution).to_s)}")}
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#{'--displaymath' if kind == :equation}
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--temp-directory #{shellescape(get_setting(:html_png_dir))}
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--png-directory #{shellescape(get_setting(:html_png_dir))}
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< #{shellescape(tmp_in.path)}
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> #{shellescape(result_file)}
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COMMAND
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end
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end
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result = File.read(result_file)
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if result.nil? || result.empty?
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maruku_error "Blahtex error: empty output"
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return
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end
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doc = Nokogiri::XML::Document.parse(result)
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png = doc.root.elements.to_a[0]
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if png.name != 'png'
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maruku_error "Blahtex error: \n#{doc}"
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return
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end
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raise "No depth element in:\n #{doc}" unless depth = png.xpath('//depth')[0]
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raise "No height element in:\n #{doc}" unless height = png.xpath('//height')[0]
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raise "No md5 element in:\n #{doc}" unless md5 = png.xpath('//md5')[0]
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depth = depth.text.to_f
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height = height.text.to_f # TODO: check != 0
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md5 = md5.text
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PNG.new("#{get_setting(:html_png_url)}#{md5}.png", depth, height)
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rescue Exception => e
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maruku_error "Error: #{e}"
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end
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def convert_to_mathml_blahtex(kind, tex)
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@@BlahtexCache ||= PStore.new(get_setting(:latex_cache_file))
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@@BlahtexCache.transaction do
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if @@BlahtexCache[tex].nil?
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Tempfile.open('maruku_blahtex') do |tmp_in|
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tmp_in.write tex
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Tempfile.new('maruku_blahtex') do |tmp_out|
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system "blahtex --mathml < #{shellescape(tmp_in.path)} > #{shellescape(tmp_out.path)}"
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@@BlahtexCache[tex] = tmp_out.read
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end
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end
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end
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blahtex = @@BlahtexCache[tex]
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doc = Document.new(blahtex, :respect_whitespace => :all)
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unless mathml = doc.root.elements['mathml']
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maruku_error "Blahtex error: \n#{doc}"
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return
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end
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return mathml
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end
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rescue Exception => e
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maruku_error "Error: #{e}"
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end
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end
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end
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end
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