Merge seperate pdfs into one, using iText

combine.rb

#!/usr/bin/env ruby -wKU

require 'rubygems'
require 'fastercsv'
require 'yaml'

begin
  # Gather the encounter information
  map = YAML::load( File.new( 'encounter-map.yml', 'r' ) )
  encounters = {}
  csv_options = {:col_sep => ';', :headers => :first_row, 
                 :write_headers => true}
  index_file = FasterCSV.open '../index.txt', csv_options
  new_index = []
  header = nil
  index_file.each do |row|
    if encounters[row["encounter_number"]].nil?
      encounters[row["encounter_number"]] = Hash.new
      encounters[row["encounter_number"]][:documents] = Hash.new
      encounters[row["encounter_number"]][:medical_record_number] =
                                                   row["medical_record_number"]
      encounters[row["encounter_number"]][:patient_name] = row["patient_name"].gsub(/ /, '-')
      encounters[row["encounter_number"]][:admit_date] = row["visit_start_date"]
    end
    encounters[row["encounter_number"]][:documents][row["file_name"]] = 
                                                          row["document_type"]
  end
  
  # Merge the documents into one PDF by encounter number
  encounters.each do |k, v| 
    puts "#{k} => #{v[:medical_record_number]} (#{v[:documents].size})"
    
    # Set the new file name -encounterNumber_patientName_admit-Date_memberID.pdf
    # Get the admit date
    admit_date = v[:admit_date][4, 6] << "-" << v[:admit_date][v[:admit_date].length-4, 4]
    admit_date = admit_date.gsub(/ /, '-')
    insurance = map[k.to_i]['insurance'] unless map[k.to_i] == nil # Get the insurance member id
    file_name = "../documents/#{k}_#{v[:patient_name].gsub( /,/, '' )}_#{admit_date}_#{insurance}.pdf"
    puts "  #{file_name}"
    
    # Get the list of files for the encounter and sort by the doc type
    files = ""
    v[:documents].sort { |d, t| d[1]<=>t[1] }.each do |doc|
      files << ";" if files.length > 1 
      files << "../data/#{doc[0]}"
    end
    command = "java -classpath itext.jar; PdfCombine #{file_name} #{files}"
    IO.popen(command) { |f| puts "  #{f.gets}" }
  end
rescue Exception => e
  puts e.message
end