Class: Texrack::LatexToPdf

Inherits:
Object
  • Object
show all
Defined in:
lib/texrack/latex_to_pdf.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(latex, logger = Logger.new(STDOUT)) ⇒ LatexToPdf

Returns a new instance of LatexToPdf.



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# File 'lib/texrack/latex_to_pdf.rb', line 4

def initialize(latex, logger=Logger.new(STDOUT))
  @latex  = latex
  @logger = logger
end

Instance Attribute Details

#latex ⇒ Object (readonly)

Returns the value of attribute latex.



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# File 'lib/texrack/latex_to_pdf.rb', line 2

def latex
  @latex
end

#logger ⇒ Object (readonly)

Returns the value of attribute logger.



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# File 'lib/texrack/latex_to_pdf.rb', line 2

def logger
  @logger
end

Instance Method Details

#command ⇒ Object 



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# File 'lib/texrack/latex_to_pdf.rb', line 49

def command
  Texrack.config[:pdflatex] || "pdflatex"
end

#generate_pdf ⇒ Object

Converts a string of LaTeX code into a binary string of PDF.

pdflatex is used to convert the file.

Raises:



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# File 'lib/texrack/latex_to_pdf.rb', line 12

def generate_pdf
  raise Texrack::LatexNotFoundError unless has_pdflatex?

  logger.debug "Generating PDF from #{latex}"
  input = Tempfile.new(["texrack-input", ".tex"])
  input.binmode
  input.write(latex)
  input.flush

  Process.waitpid(
    fork do
      begin
        Dir.chdir File.dirname(input)
        args = %w[-shell-escape -interaction batchmode -halt-on-error] + [input.path]

        logger.debug "Texrack executing: #{command} #{args}"
        exec command, *args
      rescue
        logger.error "#{$!.message}:\n#{$!.backtrace.join("\n")}\n"
      ensure
        Process.exit! 1
      end
    end)

  output  = input.path.sub(/\.tex$/, '.pdf')
  logfile = input.path.sub(/\.tex$/, '.log')
  if !File.exist?(output)
    loglines = File.read(logfile)
    logger.error "Unable to find file #{output}"
    logger.error "LaTeX output: #{loglines}"
    raise Texrack::LatexFailedError
  end

  input.close
  output
end