Class: KeepYourHead::Database::StyleLatex

Inherits:
Style
  • Object
show all
Defined in:
lib/Keepyourhead/style/StyleLatex.rb

Constant Summary collapse

WidthInCm = 
20

Class Method Summary collapse

Instance Method Summary collapse

Methods inherited from Style

addStyle, getStyle

Constructor Details

#initialize(file) ⇒ StyleLatex

Returns a new instance of StyleLatex.



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# File 'lib/Keepyourhead/style/StyleLatex.rb', line 29

def initialize( file )
end

Class Method Details

.Name ⇒ Object 



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# File 'lib/Keepyourhead/style/StyleLatex.rb', line 25

def self.Name
  "latex"
end

Instance Method Details

#compileLatex(baseDirectory, content_latex, options) ⇒ Object 



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# File 'lib/Keepyourhead/style/StyleLatex.rb', line 94

def compileLatex(baseDirectory, content_latex, options )
  width = options[:width] || Gdk::Screen.default.width || 10
  
  
  baseDirectory = ::File.expand_path baseDirectory

  directory = Resources::createWorkingDirectory
  compilation = nil
    
  success = true

  filename_tex = "flashcard.tex"
  filename_output = "output.txt"
  filename_tex = ::File.expand_path( filename_tex, directory )
  filename_output = ::File.expand_path( filename_output, directory )

  file_tex = ::File.new(filename_tex, "w")
  file_tex << content_latex
  file_tex.close

  filename_png = 'flashcard_%d.png'
  filename_png = ::File.expand_path filename_png, directory


  sub_id = fork { # fork because of use of FileUtils.cd and concurrency
    success = true
    begin
      Process.setpriority(Process::PRIO_PROCESS, 0, 19)

      FileUtils.cd( directory ) do |dir|

        # latex execution
        FileUtils.cd( baseDirectory ) {
          system( "pdflatex -output-directory='#{directory}' -interaction nonstopmode '#{filename_tex}' >/dev/null")
          success &&= system( "pdflatex -output-directory='#{directory}' -interaction nonstopmode -halt-on-error '#{filename_tex}' 2>&1 >#{filename_output}")
        }

        # ghostscript execution
        dpi = (width / (WidthInCm / 2.54)).to_i

        success &&= system( "gs -dSAFER -dBATCH -dNOPAUSE -dTextAlphaBits=4 -dGraphicsAlphaBits=4 -sDEVICE=png16m -sOutputFile='#{filename_png}' -r#{dpi} flashcard.pdf >> #{filename_output}")
      end
    rescue
      print $!, $!.backtrace, "---"
      success = false
    end
    
    exit! success ? 1 : 0
  }

  pid, status = Process.wait2 sub_id
  success &&= (status.exitstatus == 1)

  filenames = []
  i = 0
  loop do
    filename = filename_png.sub( '%d', i.to_s )
    if ::File.exist? filename then
      filenames << filename 
    else
      break if i > 5
    end

    i += 1
  end

  file_output = ::File.new( filename_output, "r" )
  output = file_output.readlines.join("")
  ::File.delete filename_output

  compilation = Compilation.new content_latex, success, output, directory, filenames
  
  if not compilation.success then
    compilation.remove
  end

  compilation
end

#content(type, flashcard, options = {}) ⇒ Object 



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# File 'lib/Keepyourhead/style/StyleLatex.rb', line 44

def content(type,flashcard, options = {})
  latex_code( type, flashcard, options )
end

#createImage(type, flashcard, options = {}) ⇒ Object 



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# File 'lib/Keepyourhead/style/StyleLatex.rb', line 32

def createImage(type, flashcard, options = {})
  latex = latex_code( type, flashcard, options )
  
  directory =
    if flashcard.file.filename then
      ::File.dirname(flashcard.file.filename)
    else
      ::File.expand_path "."
    end
  compileLatex directory, latex, options
end

#latex_code(type, flashcard, options = {}) ⇒ Object 



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# File 'lib/Keepyourhead/style/StyleLatex.rb', line 51

def latex_code( type, flashcard, options = {} )
  previewCode = options[:previewCode]
  width = options[:width] || Gdk::Screen.default.width || 10

  assert( type == FRONT || type == BACK )
  ret = case type
    when FRONT
      FrontScheme
    when BACK
      BackScheme
    end.clone

  topics = flashcard.topicNames

  contentFront = flashcard.front
  contentFront ||= topics.last
  contentBack = flashcard.back

  if previewCode then
    case type
    when FRONT
      contentFront = previewCode
    when BACK
      contentBack = previewCode
    end
  end
  
  ret.gsub!( "$(widthInCm)", WidthInCm.to_s )

  ret.gsub!( "$(width)", width.to_s )
  ret.gsub!( "$(header)", flashcard.collection.latexHeader || "" )
  ret.gsub!( "$(type)", flashcard.type || "" )
  ret.gsub!( "$(name)", flashcard.name || "" )
  ret.gsub!( "$(content_front)", contentFront || "" )
  ret.gsub!( "$(content_back)", contentBack || "" )
  ret.gsub!( "$(topics)", topics.join(".") )
  ret.gsub!( "$(prepend)", flashcard.collection.latexPrepend || "" )
  ret.gsub!( "$(append)", flashcard.collection.latexAppend || "" )


  ret
end