Class: ReVIEW::ImgMath

Inherits:
Object show all
Includes:
Loggable
Defined in:
lib/review/img_math.rb

Instance Attribute Summary

Attributes included from Loggable

#logger

Instance Method Summary collapse

Methods included from Loggable

#app_error, #debug, #error, #error!, #warn

Constructor Details

#initialize(config, path_name: '_review_math') ⇒ ImgMath

Returns a new instance of ImgMath.



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# File 'lib/review/img_math.rb', line 16

def initialize(config, path_name: '_review_math')
  @config = config
  @logger = ReVIEW.logger
  @math_dir = File.join(@config['imagedir'], path_name)
  @math_maps = {}
end

Instance Method Details

#cleanup_mathimg ⇒ Object 



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# File 'lib/review/img_math.rb', line 23

def cleanup_mathimg
  if @config['math_format'] == 'imgmath' && Dir.exist?(@math_dir)
    FileUtils.rm_rf(@math_dir)
  end
end

#defer_math_image(str, key) ⇒ Object 



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# File 'lib/review/img_math.rb', line 29

def defer_math_image(str, key)
  # for Re:VIEW >3
  @math_maps[key] = str
  File.join(@math_dir, "_gen_#{key}.#{@config['imgmath_options']['format']}")
end

#make_math_image(str, key, fontsize = 12) ⇒ Object 



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# File 'lib/review/img_math.rb', line 35

def make_math_image(str, key, fontsize = 12)
  # Re:VIEW 2 compatibility

  img_path = File.join(@math_dir, "_gen_#{key}.#{@config['imgmath_options']['format']}")
  FileUtils.mkdir_p(@math_dir)
  fontsize2 = (fontsize * 1.2).round.to_i
  texsrc = <<-EOB
\\documentclass[12pt]{article}
\\usepackage[utf8]{inputenc}
\\usepackage{amsmath}
\\usepackage{amsthm}
\\usepackage{amssymb}
\\usepackage{amsfonts}
\\usepackage{anyfontsize}
\\usepackage{bm}
\\pagestyle{empty}

\\begin{document}
\\fontsize{#{fontsize}}{#{fontsize2}}\\selectfont #{str}
\\end{document}
  EOB
  Dir.mktmpdir do |tmpdir|
    tex_path = File.join(tmpdir, 'tmpmath.tex')
    dvi_path = File.join(tmpdir, 'tmpmath.dvi')
    File.write(tex_path, texsrc)
    cmd = "latex --interaction=nonstopmode --output-directory=#{tmpdir} #{tex_path} && dvipng -T tight -z9 -o #{img_path} #{dvi_path}"
    out, status = Open3.capture2e(cmd)
    unless status.success?
      raise ApplicationError, "latex compile error\n\nError log:\n#{out}"
    end

    img_path
  end
end

#make_math_images ⇒ Object 



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# File 'lib/review/img_math.rb', line 70

def make_math_images
  return if @math_maps.empty?

  FileUtils.mkdir_p(@math_dir)
  fontsize = @config['imgmath_options']['fontsize'].to_f
  lineheight = @config['imgmath_options']['lineheight'].to_f

  texsrc = default_imgmath_preamble
  if @config['imgmath_options']['preamble_file'] && File.readable?(@config['imgmath_options']['preamble_file'])
    texsrc = File.read(@config['imgmath_options']['preamble_file'])
  end

  texsrc << <<-EOB
\\begin{document}
\\fontsize{#{fontsize}}{#{lineheight}}\\selectfont
\\input{__IMGMATH_BODY__}
\\end{document}
  EOB

  math_real_dir = File.realpath(@math_dir)
  Dir.mktmpdir do |tmpdir|
    File.open(File.join(tmpdir, '__IMGMATH_BODY__.tex'), 'w') do |f|
      @math_maps.keys.sort.each do |key|
        f.puts "% #{key}"
        f.puts @math_maps[key]
        f.puts '\\clearpage'
        f.puts
      end
    end

    tex_path = File.join(tmpdir, '__IMGMATH__.tex')
    File.write(tex_path, texsrc)

    begin
      case @config['imgmath_options']['converter']
      when 'pdfcrop'
        make_math_images_pdfcrop(tmpdir, tex_path, math_real_dir)
      when 'dvipng'
        make_math_images_dvipng(tmpdir, tex_path, math_real_dir)
      else
        error! "unknown math converter error. imgmath_options/converter parameter should be 'pdfcrop' or 'dvipng'."
      end
    rescue CompileError
      FileUtils.cp([tex_path,
                    File.join(File.dirname(tex_path), '__IMGMATH_BODY__.tex'),
                    File.join(File.dirname(tex_path), '__IMGMATH__.log')],
                   math_real_dir)
      error! "LaTeX math compile error. See #{math_real_dir}/__IMGMATH__.log for details."
    end
  end
  @math_maps.clear
end