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Contents
# frozen_string_literal: true
require_dependency "renalware/letters"
require "attr_extras"
module Renalware
module Letters
module Printing
# Mixin for PDF combination
module PdfCombining
extend ActiveSupport::Concern
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
# rubocop:disable Metrics/LineLength
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
# rubocop:enable Metrics/LineLength
def copy_tempfile_to_output_file(tmp_outfile, output_file)
FileUtils.cp tmp_outfile.path, output_file
output_file
end
def files
@files ||= []
end
def rails_tmp_folder
Rails.root.join("tmp").to_s
end
def in_a_temporary_folder
Dir.mktmpdir(nil, rails_tmp_folder) do |dir|
yield Pathname(dir)
# temp dir removed here!
end
end
# Create a tempfile outside the temp dir as dir will be destroyed when outside block closes.
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
end
end
end
end
Version data entries
58 entries across 58 versions & 1 rubygems