Print to PDF using phantomjs

incomes_controller.rb

# Example controller
class IncomesController < ApplicationController
  # Include the print
  include Controllers::Print

  # GET /incomes/1
  def show
    @income = present Income.find(params[:id])

    respond_to do |format|
      format.html
      format.print
      format.pdf { print_pdf 'show.print', "Income-#{@income}" }
    end
  end
end

print.js

// app/asseets/javascripts/print/print.js

var page = require('webpage').create(),
    system = require('system'),
    fs = require('fs'),
    page = require('webpage').create(),
    address, output, size;

// This is the print that phantomjs runs
page.viewportSize = { width: 600, height: 600 };
page.paperSize = {
  format: 'A4'
}

file = system.args[1];
pdf = system.args[2];

html = fs.read(file);
page.content = html;
//  '<style>h1{ font-weight: normal; }</style><h1>This is a test, jejejeje</h1>';
page.onLoadFinished = function() {
  page.render(pdf);
  phantom.exit();
}

print_controller.rb

# lib/controllers/print.rb
module Controllers::Print
  private

    def print_pdf(template, name)
      html = render_to_string template, layout: 'application.print'

      save_and_generate_pdf html

      # send_file
      #send_file File.read("#{full_path_name}.pdf"), filename: "#{name}.pdf"
      send_file "#{full_path_name}.pdf", filename: "#{name}.pdf"
    end

    def save_and_generate_pdf(html)
      save_printed html
      generate_phantom_pdf
    end

    def save_printed(html)
      f = File.new("#{full_path_name}.html", 'w+')
      f.write(html)
      f.close
    end

    def print_name
      @print_name ||= SecureRandom.urlsafe_base64
    end

    def full_path_name
      @full_path_name ||= "/tmp/#{print_name}"
    end

    def generate_phantom_pdf
      script = Rails.root.join('app', 'assets', 'javascripts', 'print', 'print.js')

      %x[phantomjs #{script} #{full_path_name}.html #{full_path_name}.pdf]
    end
end