Module: Renalware::Letters::Printing::PdfCombining

Extended by:
ActiveSupport::Concern
Included in:
BatchCompilePdfs
Defined in:
app/models/renalware/letters/printing/pdf_combining.rb

Overview

Mixin for PDF combination

Instance Method Summary collapse

Instance Method Details

#combine_multiple_pdfs_into_file(filepath:, glob:) ⇒ Object 



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# File 'app/models/renalware/letters/printing/pdf_combining.rb', line 14

def combine_multiple_pdfs_into_file(filepath:, glob:)
  filepath = Pathname(filepath)
  Rails.logger.info " Compiling PDFs #{glob.join(',')} into #{filepath}"
  shell_to_ghostscript_to_combine_files(glob, dir, filepath)
  filepath
end

#combine_multiple_pdfs_using_filenames(filenames, dir, output_filepath) ⇒ Object 



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# File 'app/models/renalware/letters/printing/pdf_combining.rb', line 21

def combine_multiple_pdfs_using_filenames(filenames, dir, output_filepath)
  filenames = Array(filenames)
  Rails.logger.info " Compiling PDFs #{filenames.join(',')} into #{output_filepath}"
  using_a_temporary_output_file do |tmp_outfile|
    shell_to_ghostscript_to_combine_files(filenames, dir, tmp_outfile)
    move_tempfile_to_output_file(tmp_outfile, output_filepath)
  end
end

#move_tempfile_to_output_file(tmp_outfile, output_file) ⇒ Object

rubocop:enable Metrics/LineLength



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# File 'app/models/renalware/letters/printing/pdf_combining.rb', line 45

def move_tempfile_to_output_file(tmp_outfile, output_file)
  FileUtils.mv tmp_outfile.path, output_file
  output_file
end

#rails_tmp_folder ⇒ Object 



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# File 'app/models/renalware/letters/printing/pdf_combining.rb', line 50

def rails_tmp_folder
  Rails.root.join("tmp").to_s
end

#shell_to_ghostscript_to_combine_files(filenames, dir, outputfile) ⇒ Object

rubocop:disable Metrics/LineLength



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# File 'app/models/renalware/letters/printing/pdf_combining.rb', line 31

def shell_to_ghostscript_to_combine_files(filenames, dir, outputfile)
  outputfile = Pathname(outputfile)
  cmd = "gs -dNOPAUSE -sDEVICE=pdfwrite -sOUTPUTFILE=#{outputfile} -dBATCH #{filenames.join(' ')}"
  err = msg = nil
  Open3.popen3(cmd, chdir: dir.to_s) do |_stdin, stdout, stderr|
    err = stderr.read
    msg = stdout.read
  end
  if err.present?
    raise "Error combining PDFs: #{[err, msg].join(' ')} command: #{cmd}"
  end
end

#using_a_temporary_output_file ⇒ Object

Create a tempfile outside the temp dir as dir will be destroyed when outside block closes.



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# File 'app/models/renalware/letters/printing/pdf_combining.rb', line 55

def using_a_temporary_output_file
  file = Tempfile.new("pdf_combined", rails_tmp_folder)
  begin
    yield file
  ensure
    file.close
    file.unlink # deletes the temp file
  end
end