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

Extended by:
ActiveSupport::Concern
Included in:
CreatePdfByInterleavingAddressSheetAndLetterForEachRecipient::UsingOnePdfForAllLetterSections, CreatePdfByInterleavingAddressSheetAndLetterForEachRecipient::UsingSeparatePdfForEachLetterSection
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_one(dir, output_filepath) ⇒ Object 



14
15
16
17
18
19
 
# File 'app/models/renalware/letters/printing/pdf_combining.rb', line 14

def combine_multiple_pdfs_into_one(dir, output_filepath)
  using_a_temporary_output_file do |tmp_outfile|
    shell_to_ghostscript_to_combine_files_into(tmp_outfile, dir)
    copy_tempfile_to_output_file(tmp_outfile, output_filepath)
  end
end

#copy_tempfile_to_output_file(tmp_outfile, output_file) ⇒ Object

rubocop:enable Metrics/LineLength



31
32
33
34
 
# File 'app/models/renalware/letters/printing/pdf_combining.rb', line 31

def copy_tempfile_to_output_file(tmp_outfile, output_file)
  FileUtils.cp tmp_outfile.path, output_file
  output_file
end

#files ⇒ Object 



36
37
38
 
# File 'app/models/renalware/letters/printing/pdf_combining.rb', line 36

def files
  @files ||= []
end

#in_a_temporary_folder ⇒ Object 



44
45
46
47
48
49
 
# File 'app/models/renalware/letters/printing/pdf_combining.rb', line 44

def in_a_temporary_folder
  Dir.mktmpdir(nil, rails_tmp_folder) do |dir|
    yield Pathname(dir)
    # temp dir removed here!
  end
end

#rails_tmp_folder ⇒ Object 



40
41
42
 
# File 'app/models/renalware/letters/printing/pdf_combining.rb', line 40

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

#shell_to_ghostscript_to_combine_files_into(outfile, dir) ⇒ Object

rubocop:disable Metrics/LineLength



22
23
24
25
26
27
28
 
# File 'app/models/renalware/letters/printing/pdf_combining.rb', line 22

def shell_to_ghostscript_to_combine_files_into(outfile, dir)
  cmd = "gs -dNOPAUSE -sDEVICE=pdfwrite -sOUTPUTFILE=#{outfile.path} -dBATCH #{files.join(' ')}"
  err = Open3.popen3(cmd, chdir: dir.to_s) do |_stdin, _stdout, stderr|
    stderr.read
  end
  raise "Error combining PDFs: #{err}" unless err.empty?
end

#using_a_temporary_output_file ⇒ Object

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



52
53
54
55
56
57
58
59
60
 
# File 'app/models/renalware/letters/printing/pdf_combining.rb', line 52

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