gistfile1.rb

# java -cp ./Multivalent.jar tool.pdf.Impose -paper 42x59.4cm -dim 1x1 -margin 0inch in.pdf

require 'fileutils'
class Multivalent

  PAGE_SIZES = {
    'A0' => { :page_width => "84.1", :page_height => "118.9"},
    'A1' => { :page_width => "59.4", :page_height => "84.1"},
    'A2' => { :page_width => "42.0", :page_height => "59.4"},
    'A3' => { :page_width => "29.7", :page_height => "42.0"},
    'A4' => { :page_width => "21.0", :page_height => "29.7"},
    'A5' => { :page_width => "14.8", :page_height => "21.0"},
    'A6' => { :page_width => "10.5", :page_height => "14.8"},
    'A7' => { :page_width => "7.4", :page_height => "10.5"},
    'A8' => { :page_width => "5.2", :page_height => "7.4"},
    'A9' => { :page_width => "3.7", :page_height => "5.2"},
    'A10' => { :page_width => "2.6", :page_height => "3.7"}
  }


  def self.resize_data(data,page_size,orientation)
    f = Tempfile.new("pdf")
    f << data
    f.close
    self.resize(f.path,page_size,orientation)
  end

  # returns path to the resized outfile
  def self.resize(in_file,page_size, orientation)
    `#{java_binary} -cp #{Rails.root}/lib/Multivalent.jar tool.pdf.Impose -paper #{paper_size(page_size,orientation)} -dim 1x1 #{in_file}`
    basename = File.basename(in_file)
    path = File.dirname(in_file)
    out_file ="#{path}/#{basename}-#{page_size}.pdf"
    FileUtils.mv("#{path}/#{basename}-up.pdf", out_file)
    FileUtils.rm(in_file)
    out_file
  end

  def self.java_binary
    r = `which java`
    if r.blank?
      # try AppConfig path
      r = AppConfig.java_path
      unless File.exist?(r)
        raise "Please set :java_path in config/app_config.yml"
      end
    end
    r.chomp
  end

  def self.paper_size(page_size,orientation)
    h = PAGE_SIZES[page_size]
    if orientation == "Portrait"
      "#{h[:page_width]}x#{h[:page_height]}cm"
    else
      "#{h[:page_height]}x#{h[:page_width]}cm"
    end
  end
end